Harmful gas concentration detection system and detection method thereof

Abstract

The invention discloses a harmful gas concentration detection system and a detection method thereof. The method comprises the following steps: introducing harmful gas into a multi-optical path absorbing tank; supplying temperature and current required by the working of a diode laser device by a LD driver; collimating tuning laser outputted by the diode laser device by a collimator and then emitting into the multi-optical path absorbing tank; repeatedly reflecting and absorbing in the tank and then receiving the output light by a photoelectric detector; converting an optical signal into an electric signal by the photoelectric detector through a photovoltaic conversion module; passing by a pre-amplifier and a lock-in amplifier and then entering into a data collecting and control system; sending to an ARM processor by an A / D converter; and sending a monitoring result to a harmful gas remote monitoring computer by a GPRS module. In such a manner, the harmful gas concentration detection system and the detection method thereof disclosed by the invention are high in detection sensitivity, can meet the requirement for high-precision quick monitoring for the harmful gas in atmosphere and are wide in detection scope, short in response time and high in data transmission rate.

Description

technical field [0001] The invention relates to the technical field of gas detection, in particular to a harmful gas concentration detection system and a detection method thereof. Background technique [0002] With the deterioration of air quality, large-scale smog weather has appeared in the central and eastern regions of my country for several consecutive days, and the air quality in some places has reached level six or above and serious pollution. The smog weather is mainly due to factors such as more and more cars in cities in recent years, a large amount of vehicle exhaust emissions, and secondary pollution produced by factories. The task of the air pollution monitoring system is to continuously and automatically monitor the pollutants in the air and obtain continuous instantaneous air pollution information. At present, air pollution monitoring items mainly include sulfur dioxide, nitrogen oxides, carbon monoxide, suspended particulate matter or floating dust, ozone, h...

AI Technical Summary

Problems solved by technology

In the existing monitoring system, due to the influence of thermal offset and the offset of the fringes during the acquisition of the background spectrum and the signal spectrum, the fringes cannot be eliminated well, so the external interference and the intensity noise of the semiconductor laser are very large. At the same time, the detection sensitivity is not good, and it is difficult to achieve high-precision and high-speed monitoring

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