Gas concentration detection method and apparatus thereof
A technology of gas concentration and detection environment, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of inaccurate control of optical resonance, complicated manufacturing and installation of resonant cavity, inaccurate control of total optical path, etc., to eliminate ignition, flammability and explosion The hidden danger of gas, the effect of simple structure and good measurement accuracy
Inactive Publication Date: 2008-12-10
派克森公司
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In this invention, the resonant cavity plays the role of multiple reflections of the optical path to increase the optical path, thereby reducing the size of the entire detection device, but the manufacturing and installation of the resonant cavity is relatively complicated and the cost is high, and the optical resonance in it cannot be precisely controlled , that is, the total optical path cannot be precisely controlled, which will affect the measurement accuracy. In addition, photoelectric conversion devices, signal processing devices and other devices are close to or located at the measurement site, which may easily cause explosions of flammable and explosive gases such as high-concentration methane gas, and there is a safety hazard. Hidden danger
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[0016] Embodiments of the present invention will be described below with reference to the drawings. It should be understood that these embodiments are only illustrative rather than restrictive, and the present invention also includes other modifications, replacements, combinations, etc. that can be imagined by those skilled in the art according to the present invention.
[0017] The present invention is based on the Beer-Lambert law detection gas concentration as shown in formula (1),
[0018] I(v)=I 0 (v)exp{-α(v)LP 气体} (1)
[0019] Among them, I(v) represents the intensity of the outgoing light of the light wave with wave number v, and I 0 (v) represents the intensity of incident light, L is the effective optical path of light passing through the gas, α(v) represents the light absorption coefficient, P 气体 Indicates the partial pressure (atm) of the gas. Therefore, by measuring the outgoing light intensity after the light passes through the gas with a certain optical ...
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Abstract
The invention relates to a sensing unit in a sensor system used for detecting the air concentration in the environment. The sensing unit comprises: an optical head which comprises a cylindrical hollow part with openings on the two ends and a collimator arranged in the cylindrical hollow part, wherein, one end of the cylindrical hollow part is connected with optical fiber; a column cylinder, one end of which is coupled with the other end of the optical head; a plurality of stomas which are formed on the lateral wall of the column cylinder; at least one reflecting device which is arranged in the column cylinder and is used for reflecting beams to lead to the result that the beams emit and enter the fiber again through the collimator. The beams transmitted by the fiber are coupled in the column cylinder through the collimator to cause that the beams are parallel with the axial direction of the column cylinder. The sensing unit also comprises the sensor system used for detecting the air concentration in the environment and a method using the sensor system for detecting the air concentration in the environment.
Description
technical field [0001] The invention relates to a method and a device for detecting the gas concentration in the environment, in particular to a method and a device for detecting the concentration of inflammable and explosive gas in the environment based on the principle of spectroscopy. Background technique [0002] Inflammable and explosive gas, such as methane, has always been one of the important disasters in coal mines. Timely detection of the concentration of the gas is very important for environmental safety and personal safety. [0003] One current method for detecting methane gas is based on catalytic combustion, which is very prone to error in the presence of other gases and humidity changes, and is difficult to measure high concentrations of gas due to its own measurement principle. In another gas concentration detection method, a sensor based on the principle of spectroscopy is used. Compared with conventional ionization and electrochemical gas sensors, it has th...
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IPC IPC(8): G01N21/31G01N21/25G01N21/39
Inventor 崔洪亮李亚T·科什契察
Owner 派克森公司
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