Enhanced absorption type gas detection system

Abstract

The invention relates to an enhanced absorption type gas detection system and belongs to the technical field of optical fiber gas detection. The system comprises a distributed feedback type laser device, a first beam splitter, an air chamber, a second beam splitter, a first photoelectric detector, a second photoelectric detector and a singlechip, wherein the air chamber is composed of a double-fiber collimator, a single-fiber collimator and a metal sleeve with a gas exchange hole; the distributed feedback type laser device is positioned in front of the first beam splitter, and one output end of the first beam splitter is connected with the other output end of the first photoelectric detector and then connected with the air chamber; the second beam splitter is positioned behind the air chamber, and the second photoelectric detector is positioned behind the second beam splitter. Due to the air chamber design, laser can be circularly transmitted in the air chamber, and gas molecules circularly absorb the laser so that absorption signals are greatly enhanced. The two photoelectric detectors realize photoelectric conversion for light signals, and the singlechip carries out acquisition and processing, so that gas concentration information is obtained. The system has the characteristics of high utilization ratio of laser, high cost performance and high sensitivity.

Description

technical field [0001] The invention relates to an enhanced absorption type gas detection system, that is, to a spectral absorption type, enhanced absorption type gas detection system, and belongs to the technical field of optical fiber gas detection. Background technique [0002] The high-sensitivity analysis of trace gases plays an extremely important role in scientific research, industrial and agricultural production processes, especially in the fields of polymer manufacturing, plant research and even environmental science. At present, the commonly used gas detection methods mainly include electrochemical method, dew point method, resistance-capacity method and near-infrared spectral absorption method, among which near-infrared spectral absorption method has been more and more popular in the field of trace gas detection because of its advantages of anti-electromagnetic interference, good stability, high measurement accuracy and can realize electroless detection. The wider...

AI Technical Summary

Problems solved by technology

[0004] "Photonic Sensors", 2012, Vol. 2, No. 1, pp. 71-76, by Shicong Zhang, Qiang Wang, Yan Zhang, Fujun Song, Kun Chen, Guoqing Chou, Jun Chang, Pengpeng Wang, Delong Kong, Zongliang Wang, Weijie Wang, Yongning Liu, Haiyong Song, the article entitled "Water vapor detection system based on scanning spectrum" proposes a water vapor detection system based on scanning spectrum, which uses wavelength scanning technology and difference method to realize the concentration detection of water vapor , usually in the near-infrared spectrum absorption gas detection system, the light in the gas chamber is introduced by the fiber collimator, but the working distance of the commercial fiber collimator is mostly less than 10cm, which determines that in this type of fiber optic gas detection system The effective working distance will not be very long, which limits the detection sensitivity of the system

Images