Technology and apparatus for detecting single-beam multi-wavelength mixed gas concentration in mine shaft

Abstract

The invention relates to a method for detecting the mixed gas density of single beam and multi wavelengths in the mine and relative device, belonging to the optical gas detecting technique. Wherein, selecting electric modulated (AT89C52) low-temperature heat radiate infrared electric light source (2); selecting the range of special gas density inversion formula of double wavelength method according to the detecting accuracy; filtering light (16, 17, 18, 15) that using detected gas characteristic adsorption peak wavelength and the non-adsorption wavelength as the filter wavelength; calculating math average on the light strengths of several points at the rising edge of each module period of filter light; using k=6.21713*10-6 to correct the self excursion of light source power; calculating the mixed gas explosion limit and the dangerous degree; the invention comprises a stabilize power source (ADP200), opening gas chamber (12), collecting processing circuit (9), temperature and zirconia sensor (6, 10) and dew-remove clean element (4). The invention can real-time detect variable dangerous gases, densities under mine, with high sensitivity, accuracy and quick response. And it can match present detecting system to process continuously analysis and automatic control.

Description

technical field [0001] The invention belongs to the optical gas detection technology, and mainly relates to the technical method of gas concentration detection in mines and the structural improvement of its supporting equipment. Background technique [0002] At present, the focus of research on gas concentration detection at home and abroad is mainly three types of gas sensors: carrier catalytic combustion type, optical interference type and heat conduction type, and these three types are currently the most widely used and most common gas sensors in mines. [0003] Among the three kinds of gas sensors, the carrier catalytic sensor has been widely used in recent years, and has occupied the dominant position of coal mine gas detection instruments. However, because this type of sensor is affected by inherent defects such as "poisoning" and "activation" of catalytic substances, this type of sensor has short life (generally about one year), poor stability, and frequent adjustment...

AI Technical Summary

Problems solved by technology

Regardless of the single-wavelength dual-beam method or the single-beam dual-wavelength method, infrared light sources (porcelain clay rods heated to 1000°C) are generally used, but the use of porcelain clay rod infrared light sources heated to 1000°C in mines is a serious safety hazard

In order to improve sensitivity and detection accuracy, mechanical choppers are generally used for modulation, resulting in heavy, complicated and expensive detection equipment of this type

Therefore, the application of this type of gas detection instrument in coal mines has been limited for a long time

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