Gas multi-component concentration in-situ monitoring method
A multi-component, gas detection technology, applied in the field of optical detection, can solve the problems of large volume, high manufacturing cost, complex structure, etc.
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Embodiment 1
[0042] In this embodiment, a TDLAS monitoring system simultaneously monitors the concentration of two components in the gas as an example.
[0043] In this embodiment, the TDLAS monitoring system includes two lasers, a parabolic mirror 20, a gas detection chamber 30, a converging lens 40, a photodetector 50, a lock-in amplifier, and a data processing module. The laser light emitted by the two lasers is reflected by the parabolic mirror 20 to form two parallel laser beams passing through the gas detection chamber 30, and the laser light passing through the gas detection chamber 30 is received by the photodetector 50, and the photodetector 50 converts the light intensity signal into For the electrical signal, the lock-in amplifier mediates and analyzes the converted electrical signal of the photodetector 50, thereby separating the electrical signal generated by each laser, and the separated electrical signal is transmitted to the data processing module, and the data processing mo...
Embodiment 2
[0056] This embodiment is an improvement on the basis of Embodiment 1. In this embodiment, the light output direction of the first laser 10 is also corresponding to the photodetector 50, and the second laser 11 is reflected by the plane reflector 21 and then reflected The light is received by the photodetector 50 after being parallel to the laser light emitted by the first laser 10. The manufacturing difficulty of the plane reflector 21 is low, and the angle of reflection is easy to calculate. The positions of the second laser 11 and the plane reflector 21 can be selected during installation. One, it is easier to manufacture and assemble, which is beneficial to reduce the difficulty of assembly and reduce the error caused by assembly.
[0057] Further, in this embodiment, the plane mirror 21 satisfies the following constraints:
[0058]
[0059] Among them, Z is the depression of the surface profile, Y is the radial distance of the optical axis, R is the radius of curvature...
Embodiment 3
[0061] This embodiment is a further improvement of any scheme in Embodiment 1 and Embodiment 2, and the monitoring method of this embodiment mainly includes the following steps:
[0062] S1: The two lasers are modulated by time-sharing triangular wave current signals, and the frequency of each triangular wave current signal is the same and not synchronized;
[0063] S2: Coupling the lasers emitted by the two lasers, so that the two lasers pass through the same gas detection chamber 30;
[0064] S3: The photodetector 50 receives the two laser beams passing through the detection chamber, scans the two laser beams through the time-sharing scanning signal, and distinguishes the independent data of each laser beam. corresponding to the signal;
[0065] S4: Calculate and analyze the independent data of each laser to obtain the concentration information of the two-component gases in the detection chamber.
[0066] Specifically, in this embodiment, the triangular wave current signal...
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