US-12618773-B2 - Spectrometer for detecting trace element in agricultural product and use thereof

Abstract

A spectrometer for detecting a trace element in an agricultural product and use thereof is provided. The spectrometer includes: a light source device configured to generate light required by spectroscopic detection; a convergence device configured to converge the light generated by the light source device; a chopping device configured to modulate a frequency of light converged by a convergence device; a filter device configured to shield light of a wavelength other than a preset wavelength; a detection device configured to receive light passing through a to-be-detected agricultural product and the filter device, and convert an optical signal into an electrical signal; and a processing device configured to generate spectroscopic analysis data according to the electrical signal outputted by the detection device and output a substance content analysis result according to the spectroscopic analysis data, where the preset wavelength of the filter device ranges from 400 nm to 5,000 nm.

Inventors

• Lijuan Xie
• Yingjie ZHENG
• Yibin Ying
• Lin Li

Assignees

• ZHEJIANG UNIVERSITY
• Zhejiang Kepler Technology Co., Ltd.

Dates

Publication Date

20260505

Application Date

20240322

Priority Date

20220615

Claims (18)

1. 1 . A spectrometer for detecting a trace element in an agricultural product, comprising: a light source device configured to generate light required by spectroscopic detection; a convergence device configured to converge the light generated by the light source device; and a chopping device configured to modulate a frequency of light converged by the convergence device; a filter device configured to shield light of a wavelength other than a preset wavelength; a detection device configured to receive light passing through a to-be-detected agricultural product and the filter device, and convert an optical signal into an electrical signal; a processing device configured to generate spectroscopic analysis data according to the electrical signal outputted by the detection device and output a substance content analysis result according to the spectroscopic analysis data; and a signal amplifier configured to amplify an optical signal passing through the filter device and having the preset wavelength; wherein the preset wavelength of the filter device ranges from 400 nm to 5,000 nm; and wherein the signal amplifier is made of a metamaterial having a micro-nano structure array.
2. 2 . The spectrometer for detecting the trace element in the agricultural product according to claim 1 , wherein the light generated by the light source device comprises infrared light.
3. 3 . The spectrometer for detecting the trace element in the agricultural product according to claim 1 , wherein a wavelength of the light generated by the light source device ranges from 400 nm to 5,000 nm.
4. 4 . The spectrometer for detecting the trace element in the agricultural product according to claim 1 , wherein the light source device comprises a halogen lamp.
5. 5 . The spectrometer for detecting the trace element in the agricultural product according to claim 1 , wherein the convergence device comprises a convex lens.
6. 6 . The spectrometer for detecting the trace element in the agricultural product according to claim 1 , wherein the chopping device comprises: an optical chopper comprising a rotary vane with adjustable rotational frequency for periodically shielding the light converged by the convergence device; a chopper driver configured to drive the rotary vane to rotate; and a chopper controller configured to control operation of the chopper driver to control a rotational frequency of the rotary vane; wherein the chopper driver is mechanically connected to the rotary vane of the optical chopper, and the chopper driver is electrically connected to the chopper controller.
7. 7 . The spectrometer for detecting the trace element in the agricultural product according to claim 6 , further comprising: a phase lock device configured to improve a signal-to-noise ratio (SNR) of the electrical signal outputted by the detection device to the processing device.
8. 8 . The spectrometer for detecting the trace element in the agricultural product according to claim 7 , wherein the phase lock device comprises a lock-in amplifier, and the lock-in amplifier is electrically connected to the detection device, the chopper controller and the processing device, respectively.
9. 9 . The spectrometer for detecting the trace element in the agricultural product according to claim 1 , wherein the detection device comprises a near-infrared photodetector; and the near-infrared photodetector comprises at least one of a Polycrystalline lead sulfide (PbS) detector array or an Indium Gallium Arsenide (InGaAs) detector array for detecting an optical signal of the preset wavelength.
10. 10 . A use method of the spectrometer for detecting the trace element in the agricultural product according to claim 1 , comprising: using the spectrometer for detecting the trace element in the agricultural product to detect a lycopene content in the agricultural product.
11. 11 . The use method according to claim 10 , wherein in the spectrometer for detecting the trace element in the agricultural product, the light generated by the light source device comprises infrared light.
12. 12 . The use method according to claim 10 , wherein in the spectrometer for detecting the trace element in the agricultural product, a wavelength of the light generated by the light source device ranges from 400 nm to 5,000 nm.
13. 13 . The use method according to claim 10 , wherein in the spectrometer for detecting the trace element in the agricultural product, the light source device comprises a halogen lamp.
14. 14 . The use method according to claim 10 , wherein in the spectrometer for detecting the trace element in the agricultural product, the convergence device comprises a convex lens.
15. 15 . The use method according to claim 10 , wherein in the spectrometer for detecting the trace element in the agricultural product, the chopping device comprises: an optical chopper comprising a rotary vane with adjustable rotational frequency for periodically shielding the light converged by the convergence device; a chopper driver configured to drive the rotary vane to rotate; and a chopper controller configured to control operation of the chopper driver to control a rotational frequency of the rotary vane; wherein the chopper driver is mechanically connected to the rotary vane of the optical chopper, and the chopper driver is electrically connected to the chopper controller.
16. 16 . The use method according to claim 15 , wherein the spectrometer for detecting the trace element in the agricultural product further comprises: a phase lock device configured to improve a signal-to-noise ratio (SNR) of the electrical signal outputted by the detection device to the processing device.
17. 17 . The use method according to claim 16 , wherein the phase lock device comprises a lock-in amplifier, and the lock-in amplifier is electrically connected to the detection device, the chopper controller and the processing device, respectively.
18. 18 . The use method according to claim 10 , wherein in the spectrometer for detecting the trace element in the agricultural product, the detection device comprises a near-infrared photodetector; and the near-infrared photodetector comprises at least one of a Polycrystalline lead sulfide (PbS) detector array or an Indium Gallium Arsenide (InGaAs) detector array for detecting an optical signal of the preset wavelength.

Description

CROSS REFERENCE TO THE RELATED APPLICATIONS This application is the continuation application of International Application No. PCT/CN2023/096349, filed on May 25, 2023, which is based upon and claims priority to Chinese Patent Application 202210675317.X, filed on Jun. 15, 2022, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD The present disclosure relates to the technical field of nondestructive detection on agricultural products, and in particular to a spectrometer for detecting a trace element in an agricultural product and use thereof. BACKGROUND Quality classification of agricultural products, particularly fruits, has become an additional condition in cross-border trade and an important method to improve the added value. For agricultural products, there are mainly external quality (including size, shape, color, and surface defect) and internal quality (including sugar content, sourness, and ripeness). Infrared spectroscopy is considered as a powerful tool to determine a molecular composition and a molecular structure. A near-infrared light region mainly includes an absorption band generated by absorption of a doubled frequency and a combined frequency in stretching vibration of hydrogen-containing groups (such as O—H, N—H, and C—H). Benefiting from near-infrared spectroscopy (NIRS), nondestructive detection of the internal quality of agricultural products has become possible. Nowadays, detection of the internal quality of some high-benefit agricultural products can be achievable. For example, sugar content and sourness of the fruit can be detected and taken as a classification basis to classify the internal quality of the fruit, thereby improving the economic benefit. It is of great significance to use infrared spectroscopy to detect a healthy trace element (such as lycopene) in agricultural products. Lycopene is widely found in tomatoes, tomato products, watermelons, grapefruits, and other fruits. It is the main pigment in ripe tomatoes and one of the common carotenoids. Evidence shows that lycopene can effectively reduce the occurrence of tumors such as prostate cancer, cardiovascular diseases, etc. Hence, it is important to classify the lycopene content of lycopene-containing agricultural products. However, since the lycopene content in agricultural products is far lower than the content of other components, at present, the lycopene content is detected with destructive detection methods such as spectrophotometry, thin-layer chromatography, and high-performance liquid chromatography, and these methods are obviously far from satisfactory for quick classification of agricultural products. Moreover, spectroscopic data obtained by a conventional near-infrared spectrometer include little optical information associated with the lycopene content. Therefore, it is still hard to realize quick, nondestructive detection of the lycopene content in agricultural products. SUMMARY Concepts of the present disclosure are briefly described in summary, and these concepts will be described in detail in the following specific implementations. The present disclosure is not intended to identify key features or essential features of the protected technical solution, nor is it intended to limit the scope of the protected technical solution. Embodiments of the present disclosure provide a spectrometer for detecting a trace element in an agricultural product and use thereof, to solve the technical problems in the background. According to a first aspect, an embodiment of the present disclosure provides a spectrometer for detecting a trace element in an agricultural product, including: a light source device configured to generate light required by spectroscopic detection; a convergence device configured to converge the light generated by the light source device; a chopping device configured to modulate a frequency of light converged by the convergence device; a filter device configured to shield light of a wavelength other than a preset wavelength; a detection device configured to receive light passing through a to-be-detected agricultural product and the filter device, and convert an optical signal into an electrical signal; and a processing device configured to generate spectroscopic analysis data according to the electrical signal outputted by the detection device and output a substance content analysis result according to the spectroscopic analysis data, where the preset wavelength of the filter device ranges from 400 nm to 5,000 nm. Further, the light generated by the light source device includes infrared light. Further, a wavelength of the light generated by the light source device ranges from 400 nm to 5,000 nm. Further, the light source device includes a halogen lamp. Further, the convergence device at least includes a convex lens. Further, the chopping device includes: an optical chopper including a rotary vane with adjustable rotational frequency for periodically shielding the light con