High-sensitivity multi-parameter explosion-proof type infrared gas sensor

Abstract

A high-sensitivity multi-parameter explosion-proof type infrared gas sensor is disclosed. The gas sensor comprises an optical structure and an explosion-proof structure. The optical structure includes an optical cavity. An optical channel is disposed in the optical cavity, and is a light path having a shape as a Chinese character 'you', wherein two long edges pass through the center of circle. The light path having a shape as the Chinese character 'you' is designed, reflection is performed twice, and an incident detector angle is zero, thus guaranteeing the properties of the detector furthest, and reducing influences of temperature changes on center absorption wavelength and on detectivity. A temperature and humidity measuring device is added, and therefore the integration level of the sensor is increased on the one hand, and accurate information of temperature and humidity provides data guarantee for temperature and humidity compensation on the other hand.

Description

technical field [0001] The invention relates to a sensor, in particular to a high-sensitivity multi-parameter explosion-proof infrared gas sensor. Background technique [0002] At present, infrared gas sensors are only a simple application of the infrared absorption principle, which has the characteristics of the infrared absorption principle, but in the functions of anti-water vapor interference, digital output, temperature compensation, air calibration, etc., especially the detection of multiple gas types and multiple environmental parameters There are still their own shortcomings, and they cannot adapt to the harsh environment and cannot meet the high-precision and multi-parameter application fields. [0003] CN101825566A uses a helical structure to increase the optical path, but the actual application effect is not very ideal, and the light cannot be reflected into the detector according to the designed rules. CN202092949 also uses multiple launches to increase the opti...

AI Technical Summary

Problems solved by technology

[0002] At present, infrared gas sensors are only a simple application of the infrared absorption principle, which has the characteristics of the infrared absorption principle, but in the functions of anti-water vapor interference, digital output, temperature compensation, air calibration, etc., especially the detection of multiple gas types and multiple environmental parameters There are still their own deficiencies, and they cannot adapt to harsh environments and cannot meet the application fields of high precision and multi-parameters.

[0003] CN101825566A uses a helical structure to increase the optical path, but the actual application effect is not very ideal, and the light cannot be reflected into the detector according to the designed rules

CN202092949 also uses multiple launches to increase the optical absorption length, and the number of reflections reaches 6 times. Light intensity attenuation is one aspect. Both of these two patents have a problem that the incident angle of light does not meet the design requirements of the detector, so the use effect is poor. Cannot be made into a practical product

CN201628682U belongs to the simultaneous detection of multiple gases, small size, but limited optical path, and only analog output

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