Gas sensor and method for detecting changes in concentration of hydrogen fluoride gas
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A gas sensor and hydrogen fluoride technology, which is applied in the field of gas sensors to detect changes in hydrogen fluoride gas concentration, can solve the problems of difficult to achieve online detection, bulky instruments, etc., to solve the hysteresis loop, achieve miniaturization and avoid birefringence problems Effect
Active Publication Date: 2018-02-16
哈尔滨翰奥科技有限公司
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Usually, the spatial spectral absorption method is used for measurement. In order to improve the sensitivity, a large-volume gas chamber is required, resulting in a bulky instrument and difficult to achieve online detection.
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[0023] Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings. In the interest of clarity and conciseness, not all features of an actual implementation are described in this specification. It should be understood, however, that in developing any such practical embodiment, many implementation-specific decisions must be made in order to achieve the developer's specific goals, such as meeting those constraints related to the system and business, and those Restrictions may vary from implementation to implementation. Moreover, it should also be understood that development work, while potentially complex and time-consuming, would at least be a routine undertaking for those skilled in the art having the benefit of this disclosure.
[0024] Here, it should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only the device structure and / or processing steps closely related to the ...
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Abstract
The present invention provides a gas sensor and a method for detecting the hydrogen fluoride gas concentration change by using the gas sensor. The gas sensor comprises a first laser device, a second laser device, a polarizer, an electro-optical modulator, a first isolator, a first EDFA, a second isolator, a first wave filter, an F-P cavity, a circulator, a first coupler, a second coupler, a second EDFA, a second wave filter, a third coupler and a detector, wherein the first coupler, the second coupler, the circulator, the F-P cavity, the second EDFA, the second wave filter and the third coupler form an annular cavity, the hollow optical fiber core of the F-P cavity is filled with hydrogen fluoride gas to be detected, and the hydrogen fluoride gas concentration change can be obtained by measuring the ring-down time change of the pulse signal light. According to the present invention, the hollow optical fiber photo-thermal technology, the F-P cavity interference technology and the annular cavity ring-down spectroscopy technology are combined so as to improve the detection sensitivity of the measured gas and reduce the influence of the light source fluctuation on the measurement result.
Description
technical field [0001] The invention relates to optical fiber gas sensing technology, in particular to a gas sensor and a method for detecting the concentration change of hydrogen fluoride gas. Background technique [0002] Hydrogen fluoride is one of the main decomposition products of sulfur hexafluoride, an insulating medium in power distribution equipment. The measurement is usually carried out by the spatial spectral absorption method. In order to improve the sensitivity, a large-volume gas chamber is required, which results in a bulky instrument and makes it difficult to achieve online detection. Contents of the invention [0003] A brief overview of the invention is given below in order to provide a basic understanding of some aspects of the invention. It should be understood that this summary is not an exhaustive overview of the invention. It is not intended to identify key or critical parts of the invention nor to delineate the scope of the invention. Its purpos...
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