Integrated optical fiber gas detection system and method

Abstract

The invention discloses an integrated optical fiber gas detection system and an integrated optical fiber gas detection method, which belong to the field of optical fiber gas detection. The integratedoptical fiber gas detection system comprises a signal source driving module, a laser, a temperature control module, a beam splitting device, a reference gas chamber, a first photoelectric detector, asecond photoelectric detector and a signal processing module, wherein the signal source driving module is used for generating continuously varying periodic current; the laser is used for generating initial laser beams with different wavelengths under the driving of currents with different magnitudes; the temperature control module is used for controlling the internal temperature of the laser; theto-be-detected gas absorbs the initial laser beam and outputs a target laser beam; the light splitting device is used for splitting the target laser beam into a laser beam D1 and a laser beam D2 withequal light intensity; a gas with known concentration in the reference gas chamber absorbs the laser beam D2, and outputs a reference laser beam; the first photoelectric detector converts the laser beam D1 into a first electric signal; the second photoelectric detector converts the reference laser beam into a second electric signal; the signal processing module calculates the concentration of a to-be-detected gas according to the first electric signal and the second electric signal. According to the integrated optical fiber gas detection system, the structural integrity of the to-be-detected gas chamber is prevented from being damaged, and the manufacturing process is simple and easy to integrate.

Description

technical field [0001] The invention belongs to the field of optical fiber gas detection, and more specifically relates to an integrated optical fiber gas detection system and method. Background technique [0002] Tunable semiconductor laser spectral absorption technology (TDLAS) technology starts from the Beer-Lambert theorem, and uses the characteristics of gas to absorb light intensity in certain specific wavelength bands to carry out research. Use low-frequency sawtooth wave or triangular wave as scanning signal to realize the wavelength scanning of the laser. A high-frequency modulation signal is loaded on the scanning signal to drive a narrow-linewidth laser. After gas absorption, the laser intensity attenuates. The intensity change is detected by the photodetector and extracted by the circuit; the gas concentration information is obtained by measuring It can be realized by the peak-to-peak value of the first harmonic or the peak-to-peak value of the second harmonic o...

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Problems solved by technology

[0004] Aiming at the defects of the prior art, the purpose of the present invention is to provide an integrated optical fiber gas detection system and method, aiming at solving the problem that the original gas chamber to be tested is damaged due to the fact that the spectroscopic device needs to be loaded on the gas chamber to be tested. structure and cause complex problems in the manufacturing process

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