US-20260126376-A1 - ULTRAVIOLET DIFFERENTIAL OPTICAL ABSORPTION SPECTROSCOPY (UV-DOAS) AND OPEN PATH (OP) BASED LONG-DISTANCE DETECTION DEVICE FOR CHLORINE GAS, AND METHOD

Abstract

An ultraviolet differential optical absorption spectroscopy (UV-DOAS) and open path (OP) based long-distance detection device for a chlorine gas, and a method are provided. A UV spectrometer is configured to generate a first absorption spectrogram for UV light, a second absorption spectrogram for collimated UV light penetrating an environmental gas, and a third absorption spectrogram for collimated UV light penetrating a to-be-detected chlorine gas; and a processor is configured to perform calculation on the spectrograms to obtain an absorption spectrogram for reference for concentration calculation, extract a characteristic parameter of the absorption spectrogram for reference for concentration calculation, and compare the characteristic parameter of the absorption spectrogram for reference for concentration calculation with a characteristic parameter of a standard absorption spectrogram for each of standard chlorine gases of different concentrations to determine a concentration of the to-be-detected chlorine gas.

Inventors

• Sheng Chen
• Zhixian LIU
• Yue Yu
• Dexin HOU
• Guoshan XIE
• Tonghua JIA
• Tiantian LI
• Guangxu Cheng
• Bingjie Wang
• Jipeng Han

Assignees

• China Special Equipment Inspection & Research Institute

Dates

Publication Date

20260507

Application Date

20250827

Priority Date

20241105

Claims (20)

1. 1 . An ultraviolet differential optical absorption spectroscopy (UV-DOAS) and open path (OP) based long-distance detection device for a chlorine gas, comprising: an ultraviolet (UV) light source, a UV focusing module, a reference gas cell module, a multi-point corner cube retroreflector (CCR) array, a UV spectrometer, and a processor, wherein the UV light source is configured to generate UV light, and project the UV light to the UV focusing module and the UV spectrometer; the UV focusing module is configured to focus the UV light, and project resulting collimated UV light to the reference gas cell module and the multi-point CCR array; the reference gas cell module is filled with an environmental gas; and the reference gas cell module is configured to reflect collimated UV light penetrating the environmental gas to the UV spectrometer; a to-be-detected chlorine gas is located between the UV focusing module and the multi-point CCR array; and the multi-point CCR array is configured to reflect collimated UV light penetrating the to-be-detected chlorine gas to the UV spectrometer; the UV spectrometer is configured to generate a first absorption spectrogram for the UV light, a second absorption spectrogram for the collimated UV light penetrating the environmental gas, and a third absorption spectrogram for the collimated UV light penetrating the to-be-detected chlorine gas; and the processor is in communication connection with the UV spectrometer; and the processor is configured to perform calculation on the first absorption spectrogram, the second absorption spectrogram, and the third absorption spectrogram to obtain an absorption spectrogram for reference for concentration calculation, extract a characteristic parameter of the absorption spectrogram for reference for concentration calculation, and compare the characteristic parameter of the absorption spectrogram for reference for concentration calculation with a characteristic parameter of a standard absorption spectrogram for each of standard chlorine gases of different concentrations to determine a concentration of the to-be-detected chlorine gas, wherein the characteristic parameter comprises a waveform, a wavelength width, and a peak value of each absorption peak.
2. 2 . The UV-DOAS and OP based long-distance detection device for the chlorine gas according to claim 1 , wherein the UV focusing module comprises a main optical path mirror, an off-axis parabolic mirror, and a bypass optical path mirror; the main optical path mirror is configured to reflect the UV light to the off-axis parabolic mirror; the off-axis parabolic mirror is configured to focus the UV light, and project the resulting collimated UV light to the bypass optical path mirror or the multi-point CCR array; and the bypass optical path mirror is configured to reflect the resulting collimated UV light to the reference gas cell module.
3. 3 . The UV-DOAS and OP based long-distance detection device for the chlorine gas according to claim 2 , wherein the reference gas cell module comprises a reference gas cell, a first UV filter, and a reference gas cell retroreflector, wherein the first UV filter and the reference gas cell retroreflector are provided in the reference gas cell; the reference gas cell is filled with the environmental gas; the first UV filter is configured to filter the resulting collimated UV light, and project first filtered collimated UV light to the environmental gas; and the reference gas cell retroreflector is configured to reflect the collimated UV light penetrating the environmental gas to the UV spectrometer; and the UV-DOAS and OP based long-distance detection device for the chlorine gas further comprises: an UV filter module provided between the UV focusing module and the multi-point CCR array; the UV filter module comprises a second UV filter; and the second UV filter is configured to filter the resulting collimated UV light, and project second filtered collimated UV light to the multi-point CCR array.
4. 4 . The UV-DOAS and OP based long-distance detection device for the chlorine gas according to claim 1 , wherein the multi-point CCR array comprises a plurality of CCR arrays located at different positions; the UV-DOAS and OP based long-distance detection device for the chlorine gas further comprises: a multi-point angular adjustment mirror provided between the UV focusing module and the multi-point CCR array; and the multi-point angular adjustment mirror is configured to reflect the resulting collimated UV light to a CCR array at a predetermined position, wherein the CCR array at the predetermined position is a CCR array of the plurality of CCR arrays located at the different positions.
5. 5 . The UV-DOAS and OP based long-distance detection device for the chlorine gas according to claim 4 , further comprising an auxiliary aiming module; wherein the auxiliary aiming module comprises an infrared light source and an aiming telescope; the infrared light source is configured to generate infrared light, and project the infrared light to the UV focusing module; the UV focusing module is configured to focus the infrared light, and project resulting collimated infrared light to the multi-point angular adjustment mirror; the multi-point angular adjustment mirror is configured to reflect the collimated infrared light to the multi-point CCR array; and the aiming telescope is configured to observe whether the multi-point CCR array comprises a red spot to adjust a position of the multi-point angular adjustment mirror and a position of the multi-point CCR array.
6. 6 . The UV-DOAS and OP based long-distance detection device for the chlorine gas according to claim 3 , further comprising an integrated fiber-optic transceiving module; wherein the integrated fiber-optic transceiving module is connected to the UV light source, the UV focusing module, and the UV spectrometer; the integrated fiber-optic transceiving module is configured to project the UV light generated by the UV light source to the UV focusing module and the UV spectrometer; the reference gas cell retroreflector is configured to reflect the collimated UV light penetrating the environmental gas to the bypass optical path mirror; the bypass optical path mirror is configured to reflect the collimated UV light penetrating the environmental gas to the off-axis parabolic mirror; the off-axis parabolic mirror is configured to reflect the collimated UV light penetrating the environmental gas to the main optical path mirror; the main optical path mirror is configured to project the collimated UV light penetrating the environmental gas to the integrated fiber-optic transceiving module; and the integrated fiber-optic transceiving module is configured to project the collimated UV light penetrating the environmental gas to the UV spectrometer; and the multi-point CCR array is configured to reflect the collimated UV light penetrating the to-be-detected chlorine gas to the second UV filter; the second UV filter is configured to project the collimated UV light penetrating the to-be-detected chlorine gas to the off-axis parabolic mirror; the off-axis parabolic mirror is configured to reflect the collimated UV light penetrating the to-be-detected chlorine gas to the main optical path mirror; the main optical path mirror is configured to project the collimated UV light penetrating the to-be-detected chlorine gas to the integrated fiber-optic transceiving module; and the integrated fiber-optic transceiving module is configured to project the collimated UV light penetrating the to-be-detected chlorine gas to the UV spectrometer.
7. 7 . The UV-DOAS and OP based long-distance detection device for the chlorine gas according to claim 6 , wherein the UV filter module further comprises an adjustment component; the adjustment component is in driving connection with the second UV filter; and the adjustment component is configured to adjust a position of the second UV filter and an angle of the second UV filter, such that an optical path of reflected light of the resulting collimated UV light projected to the second UV filter does not coincide with an optical path of the collimated UV light penetrating the to-be-detected chlorine gas and projected to the second UV filter.
8. 8 . The UV-DOAS and OP based long-distance detection device for the chlorine gas according to claim 1 , wherein the reference gas cell module is filled with the standard chlorine gas; the UV light source is configured to generate the UV light, and project the UV light to the UV focusing module and the UV spectrometer; the UV focusing module is configured to focus the UV light, and project the resulting collimated UV light to the reference gas cell module; the reference gas cell module is configured to reflect collimated UV light penetrating the standard chlorine gas to the UV spectrometer; the UV spectrometer is configured to generate a fourth absorption spectrogram for the UV light and a fifth absorption spectrogram for the collimated UV light penetrating the standard chlorine gas; and the processor is configured to perform calculation on the fourth absorption spectrogram and the fifth absorption spectrogram to obtain a calibration-reference absorption spectrogram, extract a characteristic parameter of the calibration-reference absorption spectrogram, and compare the characteristic parameter of the calibration-reference absorption spectrogram with the characteristic parameter of the standard absorption spectrogram for the standard chlorine gas to determine a characteristic parameter deviation caused by background noise.
9. 9 . A working method of a UV-DOAS and OP based long-distance detection device for a chlorine gas, applied to the UV-DOAS and OP based long-distance detection device for the chlorine gas according to claim 1 , and comprising the following steps: performing the calculation on the first absorption spectrogram, the second absorption spectrogram, and the third absorption spectrogram to obtain the absorption spectrogram for reference for concentration calculation; and extracting the characteristic parameter of the absorption spectrogram for reference for concentration calculation, and comparing the characteristic parameter of the absorption spectrogram for reference for concentration calculation with the characteristic parameter of the standard absorption spectrogram for each of the standard chlorine gases of the different concentrations to determine the concentration of the to-be-detected chlorine gas, wherein the characteristic parameter comprises the waveform, the wavelength width, and the peak value of each absorption peak.
10. 10 . The working method of the UV-DOAS and OP based long-distance detection device for the chlorine gas according to claim 9 , wherein the performing the calculation on the first absorption spectrogram, the second absorption spectrogram, and the third absorption spectrogram to obtain the absorption spectrogram for reference for concentration calculation comprises: calculating a sum of the second absorption spectrogram and the third absorption spectrogram, and calculating a ratio of the first absorption spectrogram to the sum to obtain the absorption spectrogram for reference for concentration calculation; or calculating a first difference between the first absorption spectrogram and the second absorption spectrogram, and calculating a second difference between the first difference and the third absorption spectrogram to obtain the absorption spectrogram for reference for concentration calculation; the extracting the characteristic parameter of the absorption spectrogram for reference for concentration calculation comprises: extracting the characteristic parameter of the absorption spectrogram for reference for concentration calculation with a convolutional neural network (CNN); and the comparing the characteristic parameter of the absorption spectrogram for reference for concentration calculation with the characteristic parameter of the standard absorption spectrogram for each of the standard chlorine gases of the different concentrations comprises: making compensation for the characteristic parameter of the absorption spectrogram for reference for concentration calculation with a characteristic parameter deviation caused by background noise to obtain a compensated characteristic parameter of the absorption spectrogram for reference for concentration calculation; and comparing the compensated characteristic parameter of the absorption spectrogram for reference for concentration calculation with the characteristic parameter of the standard absorption spectrogram for each of the standard chlorine gases of the different concentrations.
11. 11 . The working method of the UV-DOAS and OP based long-distance detection device for the chlorine gas according to claim 9 , wherein in the UV-DOAS and OP based long-distance detection device for the chlorine gas, the UV focusing module comprises a main optical path mirror, an off-axis parabolic mirror, and a bypass optical path mirror; the main optical path mirror is configured to reflect the UV light to the off-axis parabolic mirror; the off-axis parabolic mirror is configured to focus the UV light, and project the resulting collimated UV light to the bypass optical path mirror or the multi-point CCR array; and the bypass optical path mirror is configured to reflect the resulting collimated UV light to the reference gas cell module.
12. 12 . The working method of the UV-DOAS and OP based long-distance detection device for the chlorine gas according to claim 11 , wherein in the UV-DOAS and OP based long-distance detection device for the chlorine gas, the reference gas cell module comprises a reference gas cell, a first UV filter, and a reference gas cell retroreflector, wherein the first UV filter and the reference gas cell retroreflector are provided in the reference gas cell; the reference gas cell is filled with the environmental gas; the first UV filter is configured to filter the resulting collimated UV light, and project first filtered collimated UV light to the environmental gas; and the reference gas cell retroreflector is configured to reflect the collimated UV light penetrating the environmental gas to the UV spectrometer; and the UV-DOAS and OP based long-distance detection device for the chlorine gas further comprises: an UV filter module provided between the UV focusing module and the multi-point CCR array; the UV filter module comprises a second UV filter; and the second UV filter is configured to filter the resulting collimated UV light, and project second filtered collimated UV light to the multi-point CCR array.
13. 13 . The working method of the UV-DOAS and OP based long-distance detection device for the chlorine gas according to claim 9 , wherein in the UV-DOAS and OP based long-distance detection device for the chlorine gas, the multi-point CCR array comprises a plurality of CCR arrays located at different positions; the UV-DOAS and OP based long-distance detection device for the chlorine gas further comprises: a multi-point angular adjustment mirror provided between the UV focusing module and the multi-point CCR array; and the multi-point angular adjustment mirror is configured to reflect the resulting collimated UV light to a CCR array at a predetermined position, wherein the CCR array at the predetermined position is a CCR array of the plurality of CCR arrays located at the different positions.
14. 14 . The working method of the UV-DOAS and OP based long-distance detection device for the chlorine gas according to claim 13 , wherein the UV-DOAS and OP based long-distance detection device for the chlorine gas further comprises an auxiliary aiming module; wherein the auxiliary aiming module comprises an infrared light source and an aiming telescope; the infrared light source is configured to generate infrared light, and project the infrared light to the UV focusing module; the UV focusing module is configured to focus the infrared light, and project resulting collimated infrared light to the multi-point angular adjustment mirror; the multi-point angular adjustment mirror is configured to reflect the collimated infrared light to the multi-point CCR array; and the aiming telescope is configured to observe whether the multi-point CCR array comprises a red spot to adjust a position of the multi-point angular adjustment mirror and a position of the multi-point CCR array.
15. 15 . The working method of the UV-DOAS and OP based long-distance detection device for the chlorine gas according to claim 12 , wherein the UV-DOAS and OP based long-distance detection device for the chlorine gas further comprises an integrated fiber-optic transceiving module; wherein the integrated fiber-optic transceiving module is connected to the UV light source, the UV focusing module, and the UV spectrometer; the integrated fiber-optic transceiving module is configured to project the UV light generated by the UV light source to the UV focusing module and the UV spectrometer; the reference gas cell retroreflector is configured to reflect the collimated UV light penetrating the environmental gas to the bypass optical path mirror; the bypass optical path mirror is configured to reflect the collimated UV light penetrating the environmental gas to the off-axis parabolic mirror; the off-axis parabolic mirror is configured to reflect the collimated UV light penetrating the environmental gas to the main optical path mirror; the main optical path mirror is configured to project the collimated UV light penetrating the environmental gas to the integrated fiber-optic transceiving module; and the integrated fiber-optic transceiving module is configured to project the collimated UV light penetrating the environmental gas to the UV spectrometer; and the multi-point CCR array is configured to reflect the collimated UV light penetrating the to-be-detected chlorine gas to the second UV filter; the second UV filter is configured to project the collimated UV light penetrating the to-be-detected chlorine gas to the off-axis parabolic mirror; the off-axis parabolic mirror is configured to reflect the collimated UV light penetrating the to-be-detected chlorine gas to the main optical path mirror; the main optical path mirror is configured to project the collimated UV light penetrating the to-be-detected chlorine gas to the integrated fiber-optic transceiving module; and the integrated fiber-optic transceiving module is configured to project the collimated UV light penetrating the to-be-detected chlorine gas to the UV spectrometer.
16. 16 . The working method of the UV-DOAS and OP based long-distance detection device for the chlorine gas according to claim 15 , wherein in the UV-DOAS and OP based long-distance detection device for the chlorine gas, the UV filter module further comprises an adjustment component; the adjustment component is in driving connection with the second UV filter; and the adjustment component is configured to adjust a position of the second UV filter and an angle of the second UV filter, such that an optical path of reflected light of the resulting collimated UV light projected to the second UV filter does not coincide with an optical path of the collimated UV light penetrating the to-be-detected chlorine gas and projected to the second UV filter.
17. 17 . The working method of the UV-DOAS and OP based long-distance detection device for the chlorine gas according to claim 9 , wherein in the UV-DOAS and OP based long-distance detection device for the chlorine gas, the reference gas cell module is filled with the standard chlorine gas; the UV light source is configured to generate the UV light, and project the UV light to the UV focusing module and the UV spectrometer; the UV focusing module is configured to focus the UV light, and project the resulting collimated UV light to the reference gas cell module; the reference gas cell module is configured to reflect collimated UV light penetrating the standard chlorine gas to the UV spectrometer; the UV spectrometer is configured to generate a fourth absorption spectrogram for the UV light and a fifth absorption spectrogram for the collimated UV light penetrating the standard chlorine gas; and the processor is configured to perform calculation on the fourth absorption spectrogram and the fifth absorption spectrogram to obtain a calibration-reference absorption spectrogram, extract a characteristic parameter of the calibration-reference absorption spectrogram, and compare the characteristic parameter of the calibration-reference absorption spectrogram with the characteristic parameter of the standard absorption spectrogram for the standard chlorine gas to determine a characteristic parameter deviation caused by background noise.
18. 18 . The working method of the UV-DOAS and OP based long-distance detection device for the chlorine gas according to claim 11 , wherein the performing the calculation on the first absorption spectrogram, the second absorption spectrogram, and the third absorption spectrogram to obtain the absorption spectrogram for reference for concentration calculation comprises: calculating a sum of the second absorption spectrogram and the third absorption spectrogram, and calculating a ratio of the first absorption spectrogram to the sum to obtain the absorption spectrogram for reference for concentration calculation; or calculating a first difference between the first absorption spectrogram and the second absorption spectrogram, and calculating a second difference between the first difference and the third absorption spectrogram to obtain the absorption spectrogram for reference for concentration calculation; the extracting the characteristic parameter of the absorption spectrogram for reference for concentration calculation comprises: extracting the characteristic parameter of the absorption spectrogram for reference for concentration calculation with a CNN; and the comparing the characteristic parameter of the absorption spectrogram for reference for concentration calculation with the characteristic parameter of the standard absorption spectrogram for each of the standard chlorine gases of the different concentrations comprises: making compensation for the characteristic parameter of the absorption spectrogram for reference for concentration calculation with a characteristic parameter deviation caused by background noise to obtain a compensated characteristic parameter of the absorption spectrogram for reference for concentration calculation; and comparing the compensated characteristic parameter of the absorption spectrogram for reference for concentration calculation with the characteristic parameter of the standard absorption spectrogram for each of the standard chlorine gases of the different concentrations.
19. 19 . The working method of the UV-DOAS and OP based long-distance detection device for the chlorine gas according to claim 12 , wherein the performing the calculation on the first absorption spectrogram, the second absorption spectrogram, and the third absorption spectrogram to obtain the absorption spectrogram for reference for concentration calculation comprises: calculating a sum of the second absorption spectrogram and the third absorption spectrogram, and calculating a ratio of the first absorption spectrogram to the sum to obtain the absorption spectrogram for reference for concentration calculation; or calculating a first difference between the first absorption spectrogram and the second absorption spectrogram, and calculating a second difference between the first difference and the third absorption spectrogram to obtain the absorption spectrogram for reference for concentration calculation; the extracting the characteristic parameter of the absorption spectrogram for reference for concentration calculation comprises: extracting the characteristic parameter of the absorption spectrogram for reference for concentration calculation with a CNN; and the comparing the characteristic parameter of the absorption spectrogram for reference for concentration calculation with the characteristic parameter of the standard absorption spectrogram for each of the standard chlorine gases of the different concentrations comprises: making compensation for the characteristic parameter of the absorption spectrogram for reference for concentration calculation with a characteristic parameter deviation caused by background noise to obtain a compensated characteristic parameter of the absorption spectrogram for reference for concentration calculation; and comparing the compensated characteristic parameter of the absorption spectrogram for reference for concentration calculation with the characteristic parameter of the standard absorption spectrogram for each of the standard chlorine gases of the different concentrations.
20. 20 . The working method of the UV-DOAS and OP based long-distance detection device for the chlorine gas according to claim 13 , wherein the performing the calculation on the first absorption spectrogram, the second absorption spectrogram, and the third absorption spectrogram to obtain the absorption spectrogram for reference for concentration calculation comprises: calculating a sum of the second absorption spectrogram and the third absorption spectrogram, and calculating a ratio of the first absorption spectrogram to the sum to obtain the absorption spectrogram for reference for concentration calculation; or calculating a first difference between the first absorption spectrogram and the second absorption spectrogram, and calculating a second difference between the first difference and the third absorption spectrogram to obtain the absorption spectrogram for reference for concentration calculation; the extracting the characteristic parameter of the absorption spectrogram for reference for concentration calculation comprises: extracting the characteristic parameter of the absorption spectrogram for reference for concentration calculation with a CNN; and the comparing the characteristic parameter of the absorption spectrogram for reference for concentration calculation with the characteristic parameter of the standard absorption spectrogram for each of the standard chlorine gases of the different concentrations comprises: making compensation for the characteristic parameter of the absorption spectrogram for reference for concentration calculation with a characteristic parameter deviation caused by background noise to obtain a compensated characteristic parameter of the absorption spectrogram for reference for concentration calculation; and comparing the compensated characteristic parameter of the absorption spectrogram for reference for concentration calculation with the characteristic parameter of the standard absorption spectrogram for each of the standard chlorine gases of the different concentrations.

Description

CROSS REFERENCE TO THE RELATED APPLICATIONS This application is based upon and claims priority to Chinese Patent Application No. 202411562082.9, filed on Nov. 5, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD The present disclosure relates to the technical field of chlorine gas leakage detection, and in particular to an ultraviolet differential optical absorption spectroscopy (UV-DOAS) and open path (OP) based long-distance detection device for a chlorine gas, and a method. BACKGROUND Chlorine gas is highly toxic and is a major hazard for dangerous chemicals. Its leakage detection has become a key industry focus, particularly in the chemical sector. Conventional detection using electrochemical sensors at fixed monitoring points is only limited to gas sampling around these monitoring points. It generally requires a relatively high gas concentration for detection and commonly suffers from a slow detection speed, a limited detection distance, a low sensitivity, and a susceptibility to failure for environmental interference. How to realize simultaneous, rapid, and high-sensitivity detection of the chlorine gas over a large-scale region is a critical safety challenge in production, storage, use and so on of the chlorine gas. SUMMARY An objective of the present disclosure is to provide a UV-DOAS and OP based long-distance detection device for a chlorine gas, and a method, to realize simultaneous, rapid, and high-sensitivity detection of the chlorine gas over a large-scale region. To achieve the above objective, the present disclosure provides the following technical solutions. According to a first aspect, the present disclosure provides a UV-DOAS and OP based long-distance detection device for a chlorine gas. The UV-DOAS and OP based long-distance detection device for a chlorine gas includes: a UV light source, a UV focusing module, a reference gas cell module, a multi-point corner cube retroreflector (CCR) array, a UV spectrometer, and a processor, where the UV light source is configured to generate UV light, and project the UV light to the UV focusing module and the UV spectrometer;the UV focusing module is configured to focus the UV light, and project resulting collimated UV light to the reference gas cell module and the multi-point CCR array;the reference gas cell module is filled with an environmental gas; and the reference gas cell module is configured to reflect the collimated UV light penetrating the environmental gas to the UV spectrometer;a to-be-detected chlorine gas is located between the UV focusing module and the multi-point CCR array; and the multi-point CCR array is configured to reflect the collimated UV light penetrating the to-be-detected chlorine gas to the UV spectrometer;the UV spectrometer is configured to generate a first absorption spectrogram for the UV light, a second absorption spectrogram for the collimated UV light penetrating the environmental gas, and a third absorption spectrogram for the collimated UV light penetrating the to-be-detected chlorine gas; andthe processor is in communication connection with the UV spectrometer; and the processor is configured to perform calculation on the first absorption spectrogram, the second absorption spectrogram, and the third absorption spectrogram to obtain an absorption spectrogram for reference for concentration calculation, extract a characteristic parameter of the absorption spectrogram for reference for concentration calculation, and compare the characteristic parameter of the absorption spectrogram for reference for concentration calculation with a characteristic parameter of a standard absorption spectrogram for each of standard chlorine gases of different concentrations to determine a concentration of the to-be-detected chlorine gas, where the characteristic parameter includes a waveform, a wavelength width, and a peak value of each absorption peak. Optionally, the UV focusing module includes a main optical path mirror, an off-axis parabolic mirror, and a bypass optical path mirror; the main optical path mirror is configured to reflect the UV light to the off-axis parabolic mirror;the off-axis parabolic mirror is configured to focus the UV light, and project the resulting collimated UV light to the bypass optical path mirror or the multi-point CCR array; andthe bypass optical path mirror is configured to reflect the collimated UV light to the reference gas cell module. Optionally, the reference gas cell module includes a reference gas cell, as well as a first UV filter and a reference gas cell retroreflector that are provided in the reference gas cell; the reference gas cell is filled with the environmental gas; the first UV filter is configured to filter the collimated UV light, and project filtered collimated UV light to the environmental gas; and the reference gas cell retroreflector is configured to reflect the collimated UV light penetrating the environmental gas to the UV spectrometer; a