In-situ CO gas measuring device and method based on wavelength modulation spectrum technology
A technology of wavelength modulation spectrum and gas measurement, which is applied in measuring devices, color/spectral characteristic measurement, material analysis through optical means, etc. It can solve the problems that the measurement method cannot respond quickly to CO, change the composition, and the sampling path is long, etc., to achieve Reduce the amount of daily maintenance, prolong the service life and save resources
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Embodiment 1
[0057] The in-situ CO gas measurement method based on wavelength modulation spectroscopy technology of the present invention uses tunable diode laser absorption spectroscopy (TDLAS) technology with high sensitivity and strong anti-interference ability, and adopts wavelength modulation-direct absorption spectroscopy (wavelength modulation —direct absorption spectroscopy, WM-DAS) algorithm.
[0058] Traditional scanning-wavelength modulation spectroscopy generally uses high-frequency sinusoidal signals and low-frequency triangular signals to achieve wavelength scanning and modulation. The WM-DAS method includes the following steps:
[0059] S1: Use a high-frequency sinusoidal signal with a frequency of ωt to realize wavelength scanning and modulation at the same time. Considering the nonlinear influence of the laser frequency, the instantaneous laser frequency v(t) is described by the following formula:
[0060]
[0061] In the formula is the center frequency of the spectra...
Embodiment 2
[0092] Such as figure 2 As shown, the in-situ CO gas detection device for the boiler flue of a power plant includes a measuring chamber 7 and a signal transmitting and receiving device. Among them, a through hole is used for the signal generated by the signal transmitting and receiving device to enter and exit the measuring cavity 7, and the inner top of the measuring cavity 7 is provided with a corner mirror 5, and the corner mirror 5 is used to reflect the signal emitted by the signal transmitting and receiving device .
[0093] When in use, the device is installed in the boiler flue of the power plant and is heated by flue gas without condensation.
[0094] Specifically, the through holes include a flue gas through hole 18 and a signal through hole 20. The inner diameters of the signal through hole 20 and the flue gas through hole 18 are smaller than the inner diameter of the measuring chamber 7, and the inner diameter of the flue gas through hole 18 is smaller than the s...
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