Pollution-gas differential optical absorption spectroscopy measurement system with optical fiber structure

Abstract

The invention provides a pollution-gas differential optical absorption spectroscopy measurement system with optical fiber structure. The measurement system is characterized in that a xenon lamp light source is disposed in a lamp holder; light beams emitted by the xenon lamp light source are coupled to the transmitting optical fibers connected with the lamp holder; the first bundle of the optical fibers of the transmitting optical fibres are connected with a first optical switch; the second bundle of the optical fibers of the transmitting optical fibers are connected with a transmitting / receiving telescope; the second light beam penetrates through the optical switch and then is used as a background spectrum and enters in receiving optical fibers; the first light beam is transmitted after being reflected by a plane mirror of the transmitting / receiving telescope, reflected via a corner reflector, then received by the transmitting / receiving telescope and coupled to the receiving optical fibers; the receiving optical fibers penetrate through a second optical switch and a sample box and then are connected with a spectrograph; the first light beam and the second light beam are coupled by the receiving optical fibers to form the third light beam; the third light beam is received by the spectrograph; the spectrum of the third light beam is monitored by the spectrograph; and content information of the pollution gas is obtained by a data processing system according to monitored results. The measurement system is liable to disassemble and assembly, and is compact in structure and high in spectrum utilization rate.

Description

[0001] technical field [0002] The invention relates to a polluting gas monitor, in particular to an optical fiber structure polluting gas differential absorption spectrum measuring system. Background technique [0003] With the rapid development of social economy, a large amount of polluting gases emitted by natural processes, especially human activities, have entered the atmosphere on which people live, seriously threatening the ecosystem and human health. Differential absorption spectroscopy (DOAS) utilizes the characteristic absorption of various gas molecules in different wavelength bands when light is transmitted in the atmosphere to achieve accurate measurement of trace gases in the atmosphere. It has the advantages of wide measurement range, high sensitivity, and non-contact continuous online monitoring, and is widely used in the fields of trace gas monitoring and online monitoring of pollution sources. [0004] In the prior art, the structure of the commonly used ...

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Problems solved by technology

[0004] In the prior art, the commonly used DOAS system structure is relatively complex, the light turns back many times, and is blocked by mirrors, so the spectral utilization rate is not high

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