Detection device capable of realizing detection and display of three concentrations of methane gas
A methane gas and concentration detection technology, which is applied in the directions of measuring devices, gas/liquid distribution and storage, color/spectral characteristic measurement, etc., can solve the problems of large errors and the inability to accurately detect leak points by anti-corrosion layer defect detection methods, and achieve The effect of stabilizing output and reducing interference
Inactive Publication Date: 2020-04-14
合肥华领安防科技有限公司
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Problems solved by technology
However, traditional methods, such as gas path detection method, road surface inspection method, drilling detection method, exhaust gas detection method, and anti-corrosion layer defect detection method, cannot effectively and accurately detect the leak point, and the error is large
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[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0023] Such as figure 1 As shown, the detection device for the detection and display of three concentrations of methane gas: including the optical path measurement part, the gas path measurement part, the control and signal processing part, of which:
[0024] The optical path measurement part includes a laser 1 , a fiber optic connector 3 , a collimating fiber optic head 5 , a focusing lens 4 , and a photodetector 2 . The light output end of the laser 1 is optically connected to the light input end of the collimating fiber head 5 through the fiber optic connector 3 , the focusing lens 4 is set in the light output reflection circuit of the collimating fiber head 5 , and the photodetector 2 is set at the focusing point of the focusing lens 4 .
[0025] The gas path measurement part includes a ranging laser 8 , a ranging collimating lens 9 , a ranging foc...
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The invention provides a detection device capable of realizing detection and display of three concentrations of methane gas. The detection device comprises a light path measurement part, a gas path part and a control and signal processing part. The light path measurement part comprises a laser, an optical fiber optical connector, a collimation optical fiber head, a focusing lens and a photoelectric detector. The gas path measuring part comprises a distance measuring laser, a distance measuring collimating lens, a distance measuring focusing lens and a distance measuring detector. And the control and signal processing part comprises a signal generator, a pulse signal generator, a lock-in amplifier, a differential amplifier, a pre-amplifier, a laser wavelength locking module, a central control and calculation unit, a current controller and a temperature controller. And the output of the signal generator is electrically connected with the input of the current controller, the input of thelock-in amplifier and the output of the central control and calculation unit respectively. On the basis of the laser absorption spectrum technology, methane gas can be detected in real time; and stable output of the laser can be realized by utilizing a laser wavelength modulation and locking technology, the interference of an external environment to the laser is reduced, three concentrations can be switched and detected at any time, the defect that the traditional laser methane detector can only detect methane PPM (integral concentration) is overcome, and methane leakage is qualitatively and quantitatively detected.
Description
technical field [0001] The invention relates to the field of methane gas optical detection devices, in particular to a detection device capable of detecting and displaying three concentrations of methane gas. Background technique [0002] Today's world is facing the pressure of energy structure and environmental protection, and natural gas is developing rapidly all over the world because of its environmental protection, saving, and higher safety performance, and the consumption of natural gas is growing rapidly. [0003] Due to the corrosion and aging of buried and exposed natural gas transmission pipelines, valves and instruments on pipelines, human factors, and geological disasters (earthquakes, landslides, floods), natural gas leakage will cause huge economic losses, cause major safety accidents, and affect people's daily life. As the government, enterprises and society pay more and more attention to the safety and environmental protection of gas pipelines, the safety in...
Claims
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Login to View More IPC IPC(8): G01N21/31G01N21/01F17D5/00F17D5/06
CPCG01N21/31G01N21/01F17D5/005F17D5/06G01N2021/0112
Inventor 李红军汪磊沈澄梅教旭马丽华
Owner 合肥华领安防科技有限公司