Device and method for detecting concentration of gas to be detected through temperature correction

Abstract

The invention discloses a device and a method for detecting concentration of gas to be detected through temperature correction. The method comprises the following steps of: reflecting infrared rays with the wavelength of 2-12mu m emitted by a heated radiation source into two parallel infrared beams, and performing frequency modulation on the two parallel infrared beams; detecting energy change of the infrared beams after the infrared beams subjected to frequency modulation passes through a gas to be detected in an analytic gas chamber by using a microflowmeter, and converting the energy change into an alternating current voltage signal; and correcting the alternating current voltage signal according to the influence of the change of ambient temperature on a measurement result, processing the corrected alternating current voltage signal to obtain a concentration signal corresponding to the change of the concentration of the gas to be detected, and displaying or controlling the concentration signal.

Description

technical field [0001] The invention relates to the field of environmental monitoring, in particular to a device and method for detecting the concentration of a measured gas by using temperature correction. Background technique [0002] With the large-scale of my country's petrochemical, metallurgical, electric power and other industrial devices and the improvement of the overall technical equipment level, with the increasing pursuit of energy saving, quality improvement, pollution control and emission reduction, and safe production, the importance of online analytical instruments and Usage is increasing day by day. Infrared spectroscopy is one of the most rapidly developed analytical techniques for on-line analytical instruments in recent years, and has many advantages such as fast, efficient, and non-destructive. [0003] However, the infrared gas analyzer has high requirements on the ambient temperature. The change of the ambient temperature directly affects the stability...

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Problems solved by technology

[0003] However, the infrared gas analyzer has high requirements on the ambient temperature. The change of the ambient temperature directly affects the stability of the light source, the intensity of the infrared radiation, the density of the gas sample continuously flowing in the measurement gas chamber, and the normal operation of the detector, especially based on the micro flow rate. The infrared spectroscopy measurement method of the detector is more susceptible to the interference of the ambient temperature due to the thermal sensitivity of the sensitive element to measure the small gas flow change, thus affecting the measurement accuracy

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