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CN-224231617-U - Multiple collinearity noise suppression's greenhouse gas detector

CN224231617UCN 224231617 UCN224231617 UCN 224231617UCN-224231617-U

Abstract

The utility model discloses a greenhouse gas detector for multi-collinearity noise suppression, which belongs to the technical field of gas detection and comprises a laser emitting component, an optical resonant cavity, an information acquisition and processing component, a noise suppression device and an environment control component. According to the greenhouse gas detector, the phase-locked amplifier, the parallel self-adaptive filter and the parallel self-adaptive trap are arranged, so that the extraction and phase-locked amplification of the same-frequency and same-phase signals of the laser modulation frequency are realized, weak signals are extracted from noise, the filtering characteristics of the signals are automatically adjusted according to the change of input signals under complex environmental noise, the self-adaptive trap recognizes the frequency characteristics of the input signals with specific main frequency coherent noise, the filtering characteristics of the signals are adjusted, effective signals can be extracted from the complex environmental noise, the coherent noise is restrained, and the detection precision of the detector under the complex environment is improved.

Inventors

  • XI WANG
  • ZHENG YUXUAN
  • XU JIRUI
  • Yu Zhongran
  • ZHANG JIE

Assignees

  • 长春理工大学

Dates

Publication Date
20260512
Application Date
20250513

Claims (6)

  1. 1. The greenhouse gas detector for multi-collinearity noise suppression comprises a laser emission component (1), an optical resonant cavity (3) connected with the output end of the laser emission component (1), an information acquisition processing component (4) connected with the output end of the optical resonant cavity (3), a noise suppression device (5) connected with the output end of the information acquisition processing component (4) and an environment control component (2); The laser emission component (1) is characterized by comprising a laser (101), a laser controller (102) connected with the input end of the laser (101) and a signal generator (103) connected with the input end of the laser controller (102); The environment control assembly (2) comprises a singlechip (201), a temperature sensor (202) fixedly arranged at one side of a cavity (301) of the optical resonant cavity (3) and electrically connected with the input end of the singlechip (201), and a differential pressure control system (203) bidirectionally connected with the singlechip (201), wherein the input end of the singlechip (201) is electrically connected with the output end of a terminal (403) of the information acquisition and processing assembly (4); The optical resonant cavity (3) comprises a cavity (301), a front high-reflection mirror (302) fixedly arranged at the front end of the cavity (301), a rear high-reflection mirror (303) fixedly arranged at the rear end of the cavity (301), and an air inlet (304) and an air outlet (305) which are arranged on one side surface of the cavity (301); The information acquisition processing assembly (4) comprises a focusing lens (401), a photoelectric detector (402) and a terminal (403), wherein the photoelectric detector (402) is arranged at the focal position of the focusing lens (401), and the terminal (403) is connected with the input end of the laser controller (102); the noise suppression device (5) comprises a phase-locked amplifier (501) connected with the output end of the photoelectric detector (402) and with the input end of the signal generator (103), an adaptive filter (502) and an adaptive trap (503) which are connected in parallel with the output end of the signal generator (103), wherein the output ends of the adaptive filter (502) and the adaptive trap (503) are electrically connected with the input end of the signal generator (103).
  2. 2. The multi-collinearity noise-suppressed greenhouse gas detector as set forth in claim 1, wherein the pressure difference control system (203) includes an air pump (2031) fixedly connected to the air inlet (304), a mass flow controller (2032) fixedly connected to the air outlet (305), and a pressure sensor (2033) fixedly mounted on one side of the cavity (301), the input ends of the air pump (2031) and the mass flow controller (2032) are electrically connected to the output end of the single-chip microcomputer (201), and the output end of the pressure sensor (2033) is electrically connected to the input end of the single-chip microcomputer (201).
  3. 3. The apparatus of claim 1, wherein the temperature sensor (202) is a TPB430-SUB optical thermometer.
  4. 4. The apparatus of claim 2, wherein the mass flow controller (2032) is an ACU20FD-L high accuracy mass flow controller and the pressure sensor (2033) is a PTJ410 gas pressure sensor.
  5. 5. The greenhouse gas detector for multi-collinearity noise suppression according to claim 1, wherein the base materials of the front high reflecting mirror (302) and the rear high reflecting mirror (303) are zinc selenide, the thicknesses of the lenses are 5mm, the diameters of the lenses are 30mm, the curvature radius of the concave surfaces is 1000mm, the concave surfaces of the front high reflecting mirror (302) and the rear high reflecting mirror (303) are plated with high reflecting dielectric films, and the planes are plated with antireflection films.
  6. 6. The apparatus of claim 1, wherein the distance between the front high reflecting mirror (302) and the rear high reflecting mirror (303) is 160mm.

Description

Multiple collinearity noise suppression's greenhouse gas detector Technical Field The utility model relates to the technical field of gas detection, in particular to a greenhouse gas detector for suppressing multiple co-linear noise. Background The detection of atmospheric chamber gases requires long-time continuous observation, and the validity of data in the monitoring process puts strict demands on the detection instrument. In order to realize long-term, high-precision and high-stability observation of equipment, the problems of instrument noise and drift caused by environmental noise, artificial activity noise, multiple collinearity and the like received by the instrument in the detection process must be solved. This is not only a technical challenge, but is also critical to achieving accurate monitoring of atmospheric chamber gas concentrations. In a practical application environment, signals often suffer from various types of noise, and the noise may originate from the device itself, external environment interference, loss in signal transmission process, and the like. These noise blends with the signal, making the identification of weak signals exceptionally difficult. In addition, coherent noise, which is an interference wave having a specific dominant frequency, may form aliasing with the original signal due to errors and interference during signal processing and transmission. Therefore, how to extract effective signals from the noise in the complex environment and inhibit coherent noise is a key point for improving the detection accuracy of the instrument in the complex environment. Disclosure of utility model The utility model provides a greenhouse gas detector for suppressing multiple co-linear noise, which aims to solve the problem of how to extract effective signals from complex environmental noise and suppress coherent noise in the background technology. The utility model provides a greenhouse gas detector for multi-collinearity noise suppression, which comprises a laser emission component, an optical resonant cavity connected with the output end of the laser emission component, an information acquisition processing component connected with the output end of the optical resonant cavity, a noise suppression device connected with the output end of the information acquisition processing component and an environment control component; the laser emission component comprises a laser, a laser controller connected with the input end of the laser and a signal generator connected with the input end of the laser controller, wherein the environment control component comprises a singlechip, a temperature sensor fixedly arranged on one side of a cavity of the optical resonant cavity and electrically connected with the input end of the singlechip, and a differential pressure control system bidirectionally connected with the singlechip, the input end of the singlechip is electrically connected with the output end of a terminal of the information acquisition processing component, the optical resonant cavity comprises the cavity, a front high-reflection mirror fixedly arranged at the front end of the cavity, a rear high-reflection mirror fixedly arranged at the rear end of the cavity, an air inlet and an air outlet which are arranged on one side surface of the cavity, the information acquisition processing component comprises a focusing lens, a photoelectric detector and a terminal which are arranged at the focal position of the focusing lens, the terminal is connected with the input end of the laser controller, the noise suppression device comprises a signal amplifier, a phase-locked filter and a self-adaptive filter, wherein the signal amplifier is connected with the output end of the signal generator in parallel, the output ends of the self-adaptive filter and the self-adaptive trap are electrically connected with the input end of the signal generator. When the greenhouse gas detector starts to work, the working temperature and working current of the laser are regulated by the laser controller, the laser reflects laser to the front high-reflection mirror plane at the front end of the optical resonant cavity, so that reflected light is injected into the optical resonant cavity at an off-axis angle, then the laser is reflected back and forth for multiple times between the front high-reflection mirror and the rear high-reflection mirror, finally strong light beams with consistent propagation directions and same frequency and phase are output outwards, the focusing lens is used for focusing the transmission signals output by the optical resonant cavity, the photoelectric detector is used for converting the focused transmission signals into electric signals and outputting the electric signals to the terminal, the terminal is used for collecting and processing the electric signals output by the photoelectric detector and outputting digital signals to the noise suppression device, weak signals can be effectively ex