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Optical Fiber Interferometer Displacement Measurement with Large Range and High Resolution Based on Wavelength Division Multiplexing

Author: RenJunYu
Tutor: XieFang
School: Beijing Jiaotong University
Course: Optical Engineering
Keywords: Nanometrology Synthetic wave interference Feedback system LabVIEW Data Acquisition
CLC: TH822
Type: Master's thesis
Year: 2010
Downloads: 48
Quote: 0
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Abstract


The nanometer measurement technology is an important branch of nano- science and technology , With the rapid development of science and technology , nanotechnology related to the increasingly wide range of fields of machinery, electronics, materials , biology , chemistry , nano - measurement demand more and more . With the needs of industrial technology and nano- measurement technology , today's development toward higher resolution, greater measuring range in this direction . This paper presents a fiber interferometer displacement measurement based on wavelength division multiplexing technology , the use of a fiber coupler , the FBG fiber grating optics constructed a Michelson interferometer optical fiber interferometer , while taking advantage of the wavelength division multiplexing technology into the synthetic wavelength . Through the the demodulated interference fringes on the composite wave , the measuring range of the system is increased , to improve the resolution of the system , through the demodulated interference fringes on a single wavelength and at the same time to enable the system to achieve a large range of measurement to obtain high resolution. The measurement system also introduces a feedback system , the PZT is driven by a feedback loop to control the length of the reference arm , enabling to compensate for the interference of external environment , and further makes the measurement system to be stable , so that the measurement system to achieve higher accuracy . In this paper , the main tasks include : (1) to build optical measurement systems and experimental , need the interference fringes to prove the feasibility of this system . Uploaded feedback system (2 ) of the measurement system so that the measurement system more stable, the measurement accuracy is higher . ( 3) the use of LabVIEW programming the interference signal acquisition and data processing , to make the system more suitable for online measurement .

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CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Mechanical quantity measuring instruments > Displacement measuring instrument
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