Detection device and detection method for carbon monoxide concentration

Abstract

The invention discloses a detection device and a detection method for carbon monoxide concentration. In the detection device, a first beam splitter splits a light beam emitted by a light source into acalibration light beam and a detection light beam; the calibration light beam is irradiated to a photoelectric detector after passing through a collimator and a calibrated absorption cell to obtain acalibrated electrical signal; a second beam splitter splits the detection light beam into a reference light beam and a measurement light beam; the reference light beam is irradiated to the photoelectric detector after passing through the collimator to obtain a reference electrical signal; the measurement light beam is emitted from the center of a Fresnel lens after passing through the collimatorand is irradiated to a reflecting end after passing through a to-be-detected area, and the reflecting end reflects the light beam to the photoelectric detector from an original path to obtain a measurement electrical signal; a differential amplifier performs differential operation on the reference electrical signal and the measurement electrical signal to obtain a differential signal; a processordetermines the carbon monoxide concentration in the to-be-detected area according to the calibration electrical signal, the reference electrical signal and the differential signal. The detection device and the detection method disclosed by the invention can improve the detection accuracy of laser spectrum measurement of the carbon monoxide concentration in an open area.

Description

technical field [0001] The invention relates to the field of online laser detection, in particular to a carbon monoxide concentration detection device and detection method. Background technique [0002] CO is a common flammable, explosive, and toxic process gas in chemical, metallurgical and other industries. Environmental CO concentration monitoring technology can provide a reliable basis for early warning of gas leakage in hazardous areas. The optical detection method has outstanding advantages such as non-contact measurement, high sensitivity, and long life. By combining with long optical path technology, it can realize the complete coverage of regional safety monitoring, which is an important direction for the development of industrial safety monitoring technology. [0003] Infrared semiconductor laser spectrum detection technology is based on the fingerprint absorption characteristics of gas molecules on the infrared spectrum, and uses the characteristic spectral absorp...

AI Technical Summary

Problems solved by technology

However, the automatic balance detection technology cannot obtain the light intensity signal, and it is difficult to complete the normalization processing of the absorption signal and the light intensity, which reduces the detection accuracy of the gas concentration

Especially when the measurement environment is an open area, due to environmental factors such as dust, fog, and haze in the environment, there will be large fluctuations in the light intensity signal, which will further reduce the detection accuracy of the carbon monoxide concentration

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