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Paramagnetic gas molecule concentration detection system and method

A technology of gas molecules and paramagnetism, which is applied in the field of infrared detection, can solve the problems that the performance is difficult to achieve a large improvement, and achieve the effect of improving long-term working stability and anti-interference ability, simple system structure, and improving sensitivity

Active Publication Date: 2020-05-26
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

But when the shot noise limit is approached, it is difficult to achieve a large improvement in performance

Method used

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  • Paramagnetic gas molecule concentration detection system and method
  • Paramagnetic gas molecule concentration detection system and method

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Embodiment

[0050] figure 1 A kind of paramagnetic gas molecule concentration detection system is provided for this embodiment, refer to figure 1 , the system includes: a controller 28, a laser driver 18, an optical unit A, an electrical measurement unit B, a feedback frequency locking unit C and a cavity length locking unit D.

[0051] The controller 28 generates laser modulation signals and magnetic field modulation signals.

[0052] The optical unit A includes a laser 1, an optical isolator 2, a polarizing beam splitter 3, a mode matching lens 4, a polarizer 5 and a resonant cavity (6-12) sequentially optically coupled.

[0053] The laser 1 is used as the first input end of the optical unit, and is connected to the output end circuit of the laser driver 18, and is used to emit laser light under the driving of the laser driver 18; the optical isolator 2 is used to prevent reflected light from entering the laser 1; The polarization beam splitter 3 is used as the first output end of the...

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Abstract

The invention provides a paramagnetic gas molecule concentration detection system and method. The system comprises a controller, an optical unit, an electric measurement unit, a feedback frequency locking unit and a cavity length locking unit, wherein the controller is sued for generating a laser modulation signal and a magnetic field modulation signal; the optical unit is sued for generating laser and converting gas molecule concentration information into polarization information of cavity transmission light; the electric measurement unit is used for generating an alternating magnetic field in a resonant cavity, converting the polarization information of the cavity transmission light into an electric signal and extracting a harmonic signal reflecting gas concentration information from theelectric signal; the feedback frequency locking unit is used for converting a reflection light signal from the harmonic cavity into an electric signal and extracting an error signal for adjusting laser driving current from the electric signal, so as to realize the locking of laser frequency and resonant cavity frequency; and the cavity length locking unit is used for controlling a piezoelectric ceramic driver to lock the cavity length of the resonant cavity. The method is capable of improving the detection sensitivity of paramagnetic gas molecules.

Description

technical field [0001] The invention relates to the technical field of infrared detection, in particular to a paramagnetic gas molecule concentration detection system and method. Background technique [0002] Paramagnetic gas molecules such as nitric oxide (NO), nitrogen dioxide (NO 2 ) and so on play an important role in environmental protection, atmospheric chemical analysis, medical diagnosis and combustion analysis. NO and NO2 emitted into the atmosphere are the main causes of photochemical smog, acid rain and smog. In medicine, airway inflammation and lung diseases can be diagnosed by detecting the concentration of NO in the exhaled breath of the human body. Therefore, it is of great significance to quickly and accurately detect paramagnetic molecules in the atmosphere and human exhaled breath. However, in the above-mentioned test environment, the content of paramagnetic gas is very low, which puts forward higher requirements on the sensitivity of the detection system...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/23G01N21/03
CPCG01N21/0303G01N21/23
Inventor 何启欣冯其波李家琨
Owner BEIJING JIAOTONG UNIV
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