A Vibration and Gas Temperature Concentration Measurement Method Based on Ring-down Chamber
A technology of concentration measurement and gas temperature, applied in the field of vibration and gas temperature concentration measurement based on ring-down cavity, it can solve the problems of low reliability, unfavorable results, and inability to give, so as to meet the requirements of reducing the test environment and increasing reliability. Sex, the effect of reducing the impact
Active Publication Date: 2021-11-19
BEIHANG UNIV
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Problems solved by technology
However, due to the random change of the cavity length due to mechanical vibration, the probability of effective signal occurrence is also random, and the efficiency is low; and the value of the random change of the cavity length cannot be given, which is not conducive to the analysis of the results, and the reliability is not high.
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[0057] exist figure 1 Among them, the laser generating module (101) emits multiple beams of laser light with different central wavelengths, the incoming light modulating module (102) is periodically turned off, and then enters into the optical ring-down cavity (103) composed of two high-reflection mirrors, The cavity can be controlled by piezoelectric ceramics (104), and finally the signal acquisition and processing module (105) receives and processes the outgoing light intensity attenuation signal, and finally realizes high-speed measurement of gas concentration or measurement of gas concentration and the tiny displacement of the cavity speed.
[0058] Based on the above-mentioned device, the specific implementation of the system is described as follows:
[0059] Step 1. Adjust multiple single-wavelength lasers whose central wavelengths are located at the same absorption peak or adjacent absorption peaks, to ensure that the reflectivity of different wavelength mirrors is app...
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The invention designs a method for measuring vibration and gas temperature concentration based on a ring-down cavity. The components used include: a laser generating module, an optical modulation module, an optical ring-down cavity, piezoelectric ceramics, and a signal acquisition and processing module. First, the laser generator module emits two or more laser beams with different central wavelengths. According to the frequency selection characteristics of the ring-down cavity, the cavity length is changed to collect light intensity attenuation signals in time-sharing, and the attenuation coefficients of different wavelengths are solved to obtain the gas concentration. and temperature. When the piezoelectric ceramics are working, the cavity length is regularly changed to collect signals quickly; when the piezoelectric ceramics is not working, the signal can still be collected by using the cavity length change caused by random mechanical vibration, and the gas concentration can be adjusted by processing the signals. And the small displacement velocity of cavity length caused by temperature and vibration. The invention has the advantages of simple structure, convenient operation, high reliability, good anti-vibration performance, many measurable parameters, high use value and broad application prospect in the field of trace gas measurement.
Description
(1) Technical field [0001] The invention relates to a method for measuring vibration and gas temperature concentration based on a ring-down cavity, and belongs to the technical field of gas concentration measurement. (2) Background technology [0002] With the rapid development of social economy and industrial construction, higher requirements are put forward for the lower limit of gas concentration measurement. Trace gas detection has become a major scientific research topic and is widely used in industrial production, scientific research and other fields. Quantitative detection of trace gases has extremely important applications in earthquake prediction, carbon cycle, medical diagnosis, and space gas detection. The traditional gas concentration detection technology is mainly electrochemical and electrical gas concentration analysis. Electrochemical method measurement technology is generally contact measurement, which is easily affected by environmental changes and air dist...
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IPC IPC(8): G01N21/31G01N21/17G01K11/00
CPCG01K11/00G01N21/17G01N21/31
Inventor 曹章刘怡徐立军宋振源解恒马瑞
Owner BEIHANG UNIV