A laser gas analyzer

Abstract

The invention provides a laser gas analyzer. The laser gas analyzer mainly comprises a laser device module, wherein the laser device module comprises a laser device, a laser device driving circuit, a laser device temperature control and regulating circuit, a beam splitting coupler which can split a light beam generated by the laser device into 2-9 beams, the optical signal transmitting end of a reference cell, the reference cell, the signal receiving end of the reference cell, 1-8 optical fiber connector sockets, 1-8 gas detection electric signal sockets, an electric signal integrated circuit board, a central control system module which comprises filter waves, a lock-in amplification circuit, and a 4-20mA electric current loop, a man-machine interaction module, a digital output module, a power supply and an analyzer case. The laser gas analyzer has the advantages that in situ counter-penetrating type measurement can be achieved, an automatic check function and a real-time wave length locking function are achieved, and 'one machine and multiple points' in situ type on-line monitoring can be achieved.

Description

technical field [0001] The invention relates to the field of laser gas detection, in particular to a laser gas analyzer. Background technique [0002] Laser spectroscopy is a new discipline developed on the basis of traditional spectroscopy since the emergence of laser technology. The characteristics of laser are: extremely narrow spectral line width and excellent coherence, high spectral power density, tunable wavelength, and modulation of frequency and amplitude, etc. These properties of the laser led to a series of revolutionary changes in spectroscopy. Compared with traditional absorption spectroscopy, the resolution and sensitivity of laser absorption spectroscopy can be much higher than that of traditional spectroscopy methods. For a certain pollutant, as long as the appropriate spectral band is selected, the accuracy of the ppm level can be achieved; in terms of structure, direct measurement can be used, and the measurement result reflects the average concentration ...

AI Technical Summary

Problems solved by technology

for NH 3 , HCL and other highly water-soluble gases will cause component loss during the pretreatment process, resulting in large measurement errors, which cannot even be measured in some working conditions and cannot be used

In addition, using the extraction method to analyze and measure the gas to be measured often has a complex overall structure and a large amount of maintenance.

[0006] If the publication number is CN101403692A "A Laser Gas Analyzer and Calibration Method" is copied to the in-situ penetrating measurement method, it will inevitably face the problem that the light intensity is insufficient and cannot meet the actual needs of the measurement, but the in-situ The real-time monitoring of online data by the penetrating laser gas measurement method is an advantage that cannot be replaced by other testing methods. Therefore, the development of a method that can use in-situ penetrating measurement has high measurement accuracy and can realize "one machine and multiple points" monitoring laser gas analysis. Instrument is very necessary

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