Laser gas detection method with automatic linearity correction function

Abstract

The invention discloses a laser gas detection method with an automatic linearity correction function, and belongs to the field of mining industry gas concentration measurement. The method comprises the following steps of: generating a detection light beam, branching the detection light beam, enabling the branched light beams to pass through a measuring air chamber and a reference air chamber, carrying out photovoltaic conversion and harmonic wave phase locking detection, then carrying out collecting and converting and finally sending the treated light beams into a core processor; for a signal generated by the light beam passing through the reference air chamber, comparing a detected gas concentration value and a central wavelength position with two reference data values recorded during calibration at the first time by the core processor, and if the values are different, starting a linearity correction algorithm, and correcting the device; and for a signal generated by the light beam through the measuring air chamber, displaying and sending by the core processor according to a detected gas concentration value. The method provided by the invention can accurately measure gas concentration in a mine and can realize the automatic correction in a detection process, thus the underground maintaining times for workers are reduced.

Description

technical field [0001] The invention belongs to the technical field of industrial and mining gas concentration measurement, and relates to a laser gas detection method with an automatic linear correction function. Background technique [0002] At present, the domestic and foreign methods for gas concentration detection in coal mines mainly include carrier catalysis, thermal conductivity, optical interference, and infrared detection. The method of carrier catalysis for gas concentration detection has the possibility of sulfide poisoning, and the detection range is narrow and the adjustment cycle is short; the use of thermal conductivity principle to detect gas concentration has low measurement accuracy, is greatly affected by ambient temperature, and is not easy to compensate, etc. Disadvantages: The optical interferometer uses the interference phenomenon of light to measure the gas concentration in the mine. Due to the complex design of the interferometric system, the cost i...

AI Technical Summary

Problems solved by technology

[0004] Among the currently used laser gas detection methods and detection devices, the laser gas detection devices are all installed in mines with complex environments, and the detection devices are easily affected by various environmental factors, resulting in changes in their performance and inaccurate measurements. This requires mine staff to enter the site from time to time for equipment maintenance and overhaul, which not only increases the workload of the staff, but also easily creates certain hidden dangers

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