Portable gas monitor for monitoring volatile organic compounds by using differential optical absorption spectroscopy

Abstract

The invention provides a portable gas monitor for monitoring volatile organic compounds by using differential optical absorption spectroscopy, comprising a heating sampling probe, a heating sample conveyer, a heating detecting gas chamber, a light source, a spectrometer, a GPRS (general packet radio service) positioning and data transmission unit, a flow metering and exhausting device, and a computer control system; the heating sample conveyer is connected with the heating sampling probe and the heating detecting gas chamber; light from the light source enters the heating detecting gas chamber and is reflected by a DOVE prism to enter the spectrometer; a mass flow meter of the flow metering and exhausting device is connected with an exhaust nozzle of the heating detecting gas chamber, and flow and on-off of a sampling pump are automatically controlled by the computer control unit; the computer control system uses received data to calculate characteristic signals of gas absorption by using differential difference technique to obtain gas concentration; the accuracy and sensitivity of detection results can be improved through DOVE prism reflection, gas concentration correction and differential difference technique.

Description

technical field [0001] The invention belongs to the field of gas monitoring, and in particular relates to a portable differential absorption spectrometry volatile organic compound gas monitor. Background technique [0002] At present, my country's economy is in a period of rapid growth, the country attaches great importance to environmental protection, and relevant policies and regulations have been introduced one after another. In actual production, there are many types of chemical production processes, involving more than 40,000 organic substances; the process is complex, and the pipelines, valves, and reactors in the production process often leak, drip, and leak; the process tail gas is recycled or destroyed. released into the atmosphere. In today's society, the frequency of volatile organic compounds (VOC) and harmful gaseous pollutants (HAP) nuisance incidents in various countries around the world is increasing, and the consequences of local environmental pollution cau...

AI Technical Summary

Problems solved by technology

GC+FID or GC+PID method needs to carry hydrogen, air and nitrogen with you when detecting VOC, or use hydrogen, air and nitrogen continuous generators, which makes the on-site operation complicated

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