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Apparatus and method for detecting gas by using modulation absorption spectroscopy based on broadband infrared light source
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A technology of infrared light source and absorption spectrum, which is applied in measuring devices, material analysis through optical means, instruments, etc., can solve the problems of poor selectivity, low resolution, and high cost of detection technology
Active Publication Date: 2018-04-20
JILIN UNIV
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[0004] Different from the currently commonly used modulation absorption spectrum gas detection technology and device based on semiconductor lasers, the present invention discloses a modulation absorption spectrum gas detection device and method based on a broadband infrared light source, without changing the outgoing light parameters of the broadband light source , performing gratingspectroscopy and scanning / modulation "screening" processing on the broadband light wavesignal absorbed by the gas, realizing a modulation absorption spectrum gas detection technology, which overcomes the high cost of the existing TDLAS detection technology based on semiconductor lasers and the existing The disadvantages of poor selectivity and low resolution of NDIR sensors based on broadband light sources provide a new solution for the development of low-cost, high-selectivity and high-sensitivity modulated absorption spectrum gas detection devices based on broadband infrared light sources
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[0068] The air chamber 11 includes an air inlet, an air outlet, a first window 10, a second window 12, and an air chamber housing; the air inlet 26, the air outlet 27, the first window 10, and the second window 12 are fixed on the air on the housing;
[0069] The grating module also includes a first slit 15, a first light-tight baffle 14 with the first slit 15, a second slit 19, a second light-tight baffle 20 with the second slit 19, a first Plano-concave mirror 16, the second plano-concave mirror 18, reflective grating 17; the first slit 15 is attached to the first light-ti...
Embodiment 2
[0079] see image 3 , the present embodiment provides another spectral testing device and a corresponding testing method for testing the normalized luminescence spectrum of a broadband infrared light source. In the device, an optical chopper 28 is used to replace the gas chamber 11 in Embodiment 1. For The connection mode of the modulation signal generation circuit 25 has been changed accordingly, the broadband infrared light source, the constant current drive module, the first convex lens, the second convex lens, the modulation signal generation circuit 25, microcontroller, data acquisition card, detector, PZT, The PZT drive circuit and the grating module are the same as in Embodiment 1, specifically as follows:
[0080] The spectrum testing device for testing the normalized luminescence spectrum of a broadband infrared light source includes an optical chopper 28, a broadband infrared light source, a constant current drive module, a first convex lens, a second convex lens, a ...
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Abstract
The invention provides an apparatus and method for detecting gas by using modulation absorption spectroscopy based on a broadbandinfraredlight source. The apparatus comprises a constant-current driving module, the broadbandinfraredlight source, a first convex lens, a gas chamber, a gas inlet pipe, a gas outlet pipe, a second convex lens, a pressure controller, a gas pump, a raster module, a PZT, a PZT driving module, a detector, a lock-in amplifier, a data acquisition card and a microcontroller. The method comprises the following steps: subjecting broadbandinfrared light signals obtainedafter gas absorption to precise light splitting via the raster module; carrying out scanning / modulation type screening on emergent light signals by using the PZT and outputting the screened emergent light signals to the detector; and extracting second harmonic signals by using the lock-in amplifier to characterize gas concentration. The invention also provides an auxiliary device and method for testing and scaling of a normalized output spectrum of the broadband infrared light source. The invention provides a novel solution for developing a low-cost high-selectivity high-sensitivity apparatusfor detecting gas by using modulation absorption spectroscopy based on the broadband infrared light source.
Description
technical field [0001] The invention belongs to the technical field of infrared gas detection, and in particular relates to a modulation absorption spectrum gas detection device and method based on a broadband infrared light source. Background technique [0002] Infraredabsorption spectroscopy technology is one of the key technologies for gas detection. This technology uses the absorption of infrared light by gas molecules to detect. It has the advantages of high sensitivity, high precision, long adjustment cycle, long life, and good selectivity. At present, in infrared absorption spectroscopy technology, Tunable Absorption Spectroscopy (TAS) uses a semiconductorlaser light source with tunable wavelength, also known as a distributed feedback light source. By scanning and modulating the driving current of the laser light source, its emission wavelength sweeps across The absorption peak of the gas to be measured, and then use the lock-in amplification technology to extract t...
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