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An Optical Cross-correlation Based Fiber-optic Fabry-Perot Sensor Demodulation

Posted on:2020-04-04Degree:MasterType:Thesis
Country:ChinaCandidate:Z L WangFull Text:PDF
GTID:2428330599964603Subject:Optical Engineering
Abstract/Summary:PDF Full Text Request
With the development of science and technology,optic-fiber sensor has become a hot research object in the field of sensing.Fiber-optic Fabry-Perot sensors are considered to have great commercial value and a wide range of industrial applications because they are simple structure,small size,high stability,high sensitivity,immunity to electromagnetic interference,easy to multiplexing and many other advantages.For now,commercial popularization of fiber-optic Fabry-Perot sensors is limitted by the expensive demodulation system.Therefore,it is the key of popularizing the fiber-optiC Fabry-Perot sensor to develope fiber-optic Fabry-Perot sensors with low cost and high performance.In order to promote the development of fiber-optic fabry-perot sensor and reduce the cost of demodulation system for fiber optic Fabry-Perot sensors,a demodulation method based on optical cross-correlation principle is proposed in this paper.The output interference signal of fiber-optic Fabry-Perot sensor is deduced according to the basic principle of F-P interferometer.Tthe mathematical model of optical cross-correlation principle based demodulation system is established based on the geometrical structure of demodulation system,and its cross-correlation signals are simulated numerically.According to the designed demodulation system,a sensor head conformed to the demodulation range is designed.Then,a temperature and pressure sensing system based on optical cross-correlation demodulation is built and calibrated.The designed sensing system is used to measure the temperature and pressure respectively.The experiment results show that high resolution and large measurement range of demodulation have been achieved.In order to further test dynamic demodulation performance of the optical cross-correlation based demodulation system,an acoustic sensor system is set up.The experimental results show that the designed sensor system can restore the acoustic signal below 80 Hz,and the output signal has a good SNR and high detection limit.In conclusion,the research in this paper will promote the further development of fiberoptic F-P sensorS to give full play to its own advantages and promote the popularization of its industrial and commercial applications.
Keywords/Search Tags:Fabry-Perot Sensor, Optical Cross-correlation Demodulation, Fabry-Perot Interferometer
PDF Full Text Request
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