Optical interference type intelligent gas sensor

Abstract

The invention discloses an optical interference type intelligent gas sensor, which comprises an optical interferometer, a master control panel and a display panel. The optical interferometer is used for measuring gas concentration and ambient temperature of a point to be measured; a master control circuit is used for performing filtering, linearization and temperature compensation; and gas concentration value is displayed in real time through a display circuit, and is uploaded to a monitoring system in a frequency signal mode; and when the gas concentration exceeds a set alarm point, the optical interference type intelligent gas sensor can automatically give an alarm with sound and light; parameters such as the alarm point, a power failure point and a healing point can be set through infrared remote control; and zero drift and sensitivity drift of the sensor can be corrected. The optical interference type intelligent gas sensor is high in measurement precision, high in stability, long in calibration period and simple in correction, can be used for measuring concentration of different gases, and is beneficial to accurate measurement and automatic monitoring of the gases.

Description

technical field [0001] The invention belongs to the technical field of gas concentration detection, and in particular relates to an intelligent gas sensor based on the principle of light interference and using wave optics, a microprocessor, and intelligent information processing technology. Background technique [0002] Among coal mine accidents, the number of deaths due to gas explosion is the largest, and gas is the main cause of coal mine accidents. At present, the main equipment for gas measurement in mines is a gas detector based on thermocatalysis, but due to the inherent nature of the thermocatalysis element, the detector has poor stability and short calibration period; while the optical interference gas sensor has high measurement accuracy , strong stability and long calibration period. In terms of gas detection based on optical interference, Chinese patent 200820039611.7 "Optical Interference Methane Detector" designed an optical methane detector that is convenient...

AI Technical Summary

Problems solved by technology

At present, the main equipment for gas measurement in mines is a gas detector based on thermocatalysis, but due to the inherent nature of the thermocatalysis element, the detector has poor stability and short calibration period; while the optical interference gas sensor has high measurement accuracy , strong stability and long calibration period

In terms of gas detection based on optical interference, Chinese patent 200820039611.7 "Optical Interference Methane Detector" designed an optical methane detector that is convenient for measurement and facilitates downhole operations; The optical path and the connection between the gas chamber and the outside world have been improved, but the gas concentration value needs to be obtained by observing the optical interference fringes with human eyes, the reading is not intuitive and the operation is complicated; the patent 9120528.3 "Intelligent Optical Interference Gas Detector" uses a microprocessor to analyze It has been processed, but the influence of external ambient temperature and air pressure on the measurement results has not been considered; Chinese patent 201010107767.6 "Intelligent Gas Concentration Test System and Method" has considered changes in external ambient temperature and air pressure to improve measurement accuracy, but its No infrared remote control, no on-site concentration display, and complicated calibration

[0003] In short, in the existing optical interference gas concentration monitoring technology and method, the sensor cannot intuitively display the gas concentration, the calibration is complicated, it cannot be connected to the coal mine monitoring system, and it can only measure the gas concentration. Accurate automatic detection of harmful gases such as

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