Open type long optical distance CO and CH4 online testing instrument

Abstract

The invention discloses an open type long optical distance CO and CH4 online testing instrument which comprises a host box and an open type long optical distance system, a DFB (distributed feedback) semiconductor infrared laser with a center wavelength of 2334nm and a corresponding laser current control and temperature control circuit and a signal generating circuit are arranged in the host box, the host box is also provided with an off-axis parabolic mirror and a photoelectric detector; a modulation signal generated by the signal generating circuit effects on the laser current control and temperature control circuit to tune the DFB (distributed feedback) semiconductor infrared laser to produce laser with the center wavelength of 2334nm for scanning CO and CH4 absorption spectrums, the laser is perpendicularly emitted into an open type long optical distance optical path, and is reflected by a corner cube reflector to return along the original optical path to the photoelectric detector to obtain the CO and CH4 gas absorption spectrums, spectrum signals are collected, and the column concentrations of CO and CH4 gases can be calculated by inversion by a multispectral fitting algorithm, and are displayed and managed on an upper computer.

Description

Technical field: [0001] The invention belongs to the field of ambient gas detection, and in particular relates to an open-type long optical path online detection instrument for atmospheric ambient gas CO and CH4. Background technique: [0002] With the acceleration of the pace of life in modern society, the pollution of the atmospheric environment is becoming more and more serious. Among them, CO, which comes from coal combustion and motor vehicle exhaust, is one of the important atmospheric pollutants. Important tracer; although CO itself is not a direct contributor to the greenhouse effect, its chemical reaction with OH radicals controls the concentration distribution and changes of other greenhouse gases such as CO2, CH4, O3, and methane (CH4) is an atmospheric content The greenhouse gas second only to CO2 is a hydrocarbon with relatively stable chemical properties. It can strongly absorb the earth's long-wave radiation and has a greenhouse effect, which in turn has a m...

AI Technical Summary

Problems solved by technology

However, considering that the current domestic gas concentration detector market is dominated by some foreign products, although it has high sensitivity, fast response, continuous monitoring, and safety and reliability, its price is quite expensive. imperative

Images