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Design of a Strain Measurement System Based on Michelson Fiber Optical Interferer Sensor

Author: LuKun
Tutor: LiangDaKai
School: Nanjing University of Aeronautics and Astronautics
Course: Measuring Technology and Instruments
Keywords: Michelson interferometer MCU Fiber Optic Sensors Sentenced to circuit
CLC: TH823.3
Type: Master's thesis
Year: 2005
Downloads: 273
Quote: 6
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Abstract


This article is based the mechanics teaching experiments reform engineering background , detailing the design process of a fiber-based Michelson interference of fiber optic sensors used in strain measurement experimental system as a whole , including the overall analysis of the system design principles , system hardware and software design and much more . Taken in the design of the test system based on the principle of the Michelson interferometer fiber optic sensors as taken in the design of the test system as the preferred strain measurement based on the Michelson interferometer principle of fiber optic sensors . But relative to a conventional resistance strain gauge measurement specimen of the micro-strain method , the fiber optic Michelson sensor measuring strain has its own drawbacks , first not there is a clear indication of the type of strain , which requires the subsequent signal processing given circuit implementation of how to determine the direction of strain . Second from the fundamental principle that the strain signal is weak , resulting in signal processing has also brought trouble , this paper presents the method of how to improve the signal-to-noise ratio . This paper first introduces the basic principles of the fiber-optic Michelson interferometer phenomenon , as well as the optical path sensing system implementation, including the light source device circuit design and debugging , measurement systems were built and how to improve the signal-to-noise ratio . Secondly, the sensor signal processing, including the shaping of the signal amplification, acquisition, strain direction and the signal from the lower position machine how to transfer to the host PC . Which relates to the microcontroller selection, circuit design , CPLD programming , microcontroller programming , and finally discusses the host computer program written in LabView software , including real-time display of the signal , the strain of the size of the calculations and the experimental data statements generate and print content. Finally , on this basis , some of the results of the above preliminary exploration of how to use optical fiber FP sensor strain measurement .

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CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Mechanical quantity measuring instruments > Force measuring instruments > Strain gauges
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