Poisonous and harmful gas concentration on-line testing method

Abstract

The invention discloses a poisonous and harmful gas concentration on-line testing method. The method comprises 1, starting a broadband light source, and respectively transmitting the broadband light beam into a measurement gas chamber and a reference gas chamber, 2, detecting light transmission intensity of the reference gas chamber by an optical detector and transmitting a signal into a divider, 3, shooting broadband light into the measurement gas chamber, detecting light intensity by the optical detector, carrying out treatment by a light detector and a digital lock-in-amplifier and transmitting the signal into the divider, 4, scanning oscillator frequency by a sweep generator, and setting doubled modulation frequency as a reference signal by a frequency doubler, 5, separating alternating current and direct current parts of a gas concentration electrical signal by a circuit of the optical detector, and feeding the alternating current part into the digital lock-in-amplifier, and 6, carrying out treatment by a gas concentration computing model to obtain a concentration value of gas to be detected and outputting and displaying the concentration value of the gas. The poisonous and harmful gas concentration on-line testing method can effectively improve a measurement precision of poisonous and harmful gas and has measurement safety and reliability.

Description

technical field [0001] The invention relates to a gas detection method, in particular to an online detection method for the concentration of toxic and harmful gases. Background technique [0002] The current industrial process will produce a lot of toxic and harmful gases, which have seriously threatened the safety of life and property. It is necessary to strictly detect and forecast flammable, explosive, toxic and harmful gases in the mining process. At present, the commonly used gas detection methods mostly use electrochemical principles, gas semiconductivity test principles, MOS field effect tube principles, heat conduction principles, catalytic combustion principles, infrared test principles and other methods, and their technologies are relatively mature. However, when the electrochemical principle is based on electronic characteristics, there may be sparks and explosions during use. This is the Achilles heel of electrochemical testing, and this type of testing method is...

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Problems solved by technology

[0003] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is how to solve the problems of difficult measurement of toxic and harmful gases, poor safety, and low measurement accuracy, and provide an online testing method for the concentration of toxic and harmful gases, which can effectively improve the measurement of toxic and harmful gases. accuracy, and make measurements safer and more reliable

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