A gas sensing probe based on triangular microcavity dual-channel f-p interference compensation
A gas sensing and F-P technology, applied in the field of optical fibers, can solve the problems of difficult to meet the application requirements of complex environments, large size of optical fiber gas sensors, long response time, etc., to achieve compact structure, real-time monitoring of gas leakage, and small volume.
Active Publication Date: 2020-03-24
NORTHEASTERN UNIV LIAONING
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Problems solved by technology
[0005] The invention provides a gas sensing probe based on triangular microcavity dual-channel F-P interference compensation, which solves the problems of the current optical fiber gas sensor with large volume, low sensitivity, long response time, and difficult to meet the application requirements of complex environments
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[0014] Embodiments of the present invention will be described in detail below in conjunction with technical solutions and accompanying drawings.
[0015] The present invention proposes a gas sensing probe based on triangular microcavity dual-path F-P interference compensation, the basic principle of which is to realize accurate measurement of the distance between reflective surfaces by means of the interference effect of light on two reflective surfaces of the F-P cavity. The shape of the probe is cylindrical, the length is 50mm, and the diameter is 20mm. It includes the optical path chamber 1 and the detection chamber 2. The two chambers are separated by the sealing plate 3 to prevent the heating of the components in the optical path chamber 1 and change the monitoring chamber. 2 The nature of the gas to be measured, and can effectively block the crosstalk of electromagnetic radiation. The optical path chamber 1 includes a light source 4 with an output wavelength of 1520-1580...
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Abstract
The invention discloses a gas sensing probe based on a triangular microcavity dual-path F-P interference compensation. The probe includes an optical path chamber and a detection chamber. The two chambers are separated by a sealing plate, and the optical path chamber includes a light source. , after the light emitted by it passes through the dichroic prism, it is focused and collimated by the convex lens, and the light signal returned from the detection chamber is received by the photodetector. The detection chamber is composed of an optical fiber structure, a grid spacer bracket, an air inlet and an air outlet. A gas detection chamber is constructed at one end of the optical fiber structure. In order to increase the reflectivity, a gold film reflective layer is coated on the end of the optical fiber structure. This invention can realize temperature self-compensation through differential processing of dual-channel F-P interference signals, so that the probe is not affected by the ambient temperature when working. The probe has a compact structure and small volume, and can realize installation and gas leakage in a small space. real-time monitoring.
Description
technical field [0001] The invention belongs to the field of optical fiber technology, and relates to a gas sensing probe based on triangular microcavity dual-channel F-P interference compensation, which can realize precise monitoring of the concentration of toxic and harmful gases in industrial environments and early warning of leakage of trace dangerous gases. Background technique [0002] There are many gas detection methods, usually according to the monitoring principle can be divided into: electrochemical method, gas chromatography, optical method, polymer material gas sensor, etc. However, the above-mentioned detection technologies for hazardous gases have long response time, expensive equipment, and difficulty in meeting the needs of electromagnetic radiation and biochemical corrosion environments. Optical fiber sensing technology was gradually developed with the development of optical communication in the middle and late last century. It is a sensing technology that ...
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IPC IPC(8): G01N21/45
CPCG01N21/45G01N2021/458
Inventor 李晋隋政麒李周兵
Owner NORTHEASTERN UNIV LIAONING