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Method and device for realizing optimal modulation coefficient of multi-gas spectral line detection
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A technology of modulation coefficient and realization method, which is applied in the measurement of pressure or flow rate, gas concentration and temperature, and can solve the problems of inability to take into account spectral line parameters, low sensitivity and precision of multi-gas spectral lines, etc., and achieve the effect of improving accuracy
Inactive Publication Date: 2016-08-31
TIANJIN UNIV
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However, the existing signal generator and TDLAS system composition method are realized by superposition of the sawtooth wave and sine wave respectively generated by the signal generator, and a certain fixed sine wave amplitude is adopted. In one sawtooth wave scanning cycle, all the signals cannot be considered. Spectral line parameters, resulting in low sensitivity and precision of multi-gas spectral line detection
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Embodiment 1
[0055] Embodiment 1: (measure three kinds of gas concentration near 1580nm)
[0056] In the wavelength range of 1580.5nm ~ 1581.0nm, CO can be measured 2 , CO, C 2 h 2 For the three gases, the parameters of the absorption lines can be obtained from the HITRAN database. Using DFB laser, the concentration of these three gases can be covered and measured in one wavelength scan period. However, the three spectral lines to be measured have different spectral line parameters, as shown in Table 1.
[0057] Table 1.CO 2 , CO, C 2 h 2 The parameters of the absorption spectrum near 1580nm (T=296K, P=1atm, x CO2 =x CO =x C2H2 = 1%, 97% of air)
[0058] serial number
gas molecule
Spectral line wavelength / nm
Absorption line strength / cm / molecule
Spectral line width / nm
1.
CO 2
1580.993
1.13E-23
0.0359
2.
CO
1580.828
1.57E-23
0.0319
3.
C 2 h 2
1581.129
9.08E-25
0.0385
[0059] The use of DF...
Embodiment 2
[0069] Embodiment 2: (1.395um temperature measurement, open light path)
[0070] Measure temperature by measuring multiple absorption lines of water molecules, H around 1395.6nm 2 The absorption spectrum parameters of O can be obtained from the HITRAN database, as shown in Table 2. Using a DFB laser, one wavelength scan cycle can cover two H2O absorption lines. However, since the two spectral lines to be measured have different spectral line widths, they are:
[0071] Table 2.H 2 The parameters of the absorption line of O around 1395.6nm (T=296K, P=1atm, x H2O = 10%, 90% air)
[0072] serial number
Spectral line wavelength / nm
wave number / cm -1
Absorption line strength / cm / molecule
Spectral line width / nm
1.
1395.693
7164.90
1.47E-22
0.0202
2.
1395.514
7165.82
5.93E-21
0.0505
[0073] The use of DFB lasers can cover these two spectral lines within a wavelength scanning period. In the current existing method,...
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Abstract
The invention belongs to the technical field of measurement of gas concentration, temperature, pressure or flow rate, and provides a method and device capable of satisfying the detection of multi-gas spectral lines and enabling optimal detection of each spectral line, which can improve the concentration of multi-gas in a TDLAS system, The detection sensitivity of pressure, temperature or flow rate, the method and device are suitable for on-line, in-situ or off-line detection or monitoring applications of trace gas. For this reason, the technical scheme of the present invention is: the optimal modulation coefficient realization method of multi-gas spectrum line detection, detection gas to the measurement of the gas absorption line of laser to the parameter of gas including concentration, pressure, temperature and flow velocity, in In one scanning period of the laser wavelength, the wavelength modulation coefficient of the laser changes, that is, two or more sine wave amplitudes are used in one scanning period. The invention is mainly applied to gas detection.
Description
technical field [0001] The invention belongs to the technical field of gas concentration, temperature, pressure or flow rate measurement, and relates to the simultaneous detection of multiple gas components or the simultaneous detection of multiple absorption lines of a single gas. By optimizing the modulation coefficients of all spectral lines to be measured, A method and device for improving the sensitivity of multi-gas spectral line detection, specifically, a method and device for realizing the optimal modulation coefficient of multi-gas spectral line detection. Background technique [0002] Tunable diode laser absorption spectroscopy (TDLAS) is a gas detection technology with high sensitivity, high resolution and fast response, which is widely used in gas monitoring in industrial processes, environmental atmospheric detection and scientific research. . It uses the wavelength tuning characteristics of diode lasers, that is, the output wavelength of the laser can be chang...
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