Optical fiber photoacoustic gas sensor

Pao Yue-kong Library Electronic Theses Database

Optical fiber photoacoustic gas sensor

 

Author: Wang, Min
Title: Optical fiber photoacoustic gas sensor
Degree: M.Sc.
Year: 2016
Subject: Gas detectors.
Gas detectors -- Design and construction.
Optical fiber detectors.
Hong Kong Polytechnic University -- Dissertations
Department: Faculty of Engineering
Pages: ix, 46 pages : color illustrations
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2894570
URI: http://theses.lib.polyu.edu.hk/handle/200/8519
Abstract: With the development of the industrial production, it is rather important to detect and monitor the explosive and hazardous gas accurately and in time. There are some common gas detection methods, such as: gas chromatography, Chemiluminescence analysis, photoacoustic spectroscopy (PAS) and so on. Among these gas detection methods, the photoacoustic spectroscopy (PAS) is the most popular gas detection method in recent years since it has the advantages of that is high sensitivity, short response time, excellent selectivity, real-time monitoring and so on. However, the trace gas detection of PAS based on the traditional electronic microphone is not suitable for the environment, which is explosive and full of electromagnetic interference. Therefore, the trace gas detection of PAS, which has the property of high sensitivity and anti-electromagnetic interference is quite necessary in the new areas. In my dissertation, we make use of an all-optical fiber gas sensor based on photoacoustic spectroscopy with graphene diaphragm with Fabry-Perot interferometer (FPI) in our gas detection experiment. The acoustic detector is made of a ferrule-top multilayer graphene diaphragm, which is about 100nm-thick and 2.5mm-diameter. In our experiment, we have demonstrated that the detection limit of PA gas sensor can be achieved lower which is approximately 1.28 ppm (parts-per-million) of gas acetylene. The photoacoustic (PA) sensor with graphene diaphragm really overcomes the shortcomings of electromagnetic interference and explosive environments and causes it rather suitable for space-limited, real-world remote applications and so on.

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