Sinusoidal phase-modulating laser diode interferometer insensitive to intensity modulation for real-time displacement measurement with feedback control system |
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| Authors: | Bofan Wang Xiangzhao Wang Zhongliang Li Osami Sasaki |
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| Institution: | 1. Chinese Academy of Sciences, Laboratory of Information Optics and Opt-Electronic Technology, Shanghai Institute of Optics and Fine Mechanics, Shanghai 201800, China;2. Graduate School of the Chinese Academy of Sciences, Beijing 100039, China;3. Faculty of Engineering, Niigata University, Niigata-shi 950-2181, Japan;1. Basic Experimental Teaching Center, Anhui Sanlian University, Hefei 230601, China;2. Key laboratory of Opto-Electronic Information Acquisition and Manipulation of Ministry of Education, Anhui University, Hefei 230601, China;1. Department of Electronics and Communication Engineering, Academy of Technology, Adisaptagram, Hooghly 712121, West Bengal, India;2. Education Division, SKF Group of Institution, Sir J. C. Bose School of Engineering, Mankundu, Hooghly 712139, West Bengal, India;1. Centro de Investigação em Química, Departamento de Química e Bioquímica, Faculdade de Ciências da Universidade do Porto, Porto, Portugal;2. Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Málaga, Campus de Teatinos s/n, 29071 Málaga, Spain;3. Institute for Multidisciplinary Research, University of Belgrade, KnezaVi?eslava 1, 11000 Beograd, Serbia;4. Departamento de Química Inorgánica, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain;1. Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119, China;2. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | In sinusoidal phase modulating laser diode (LD) interferometer, the injection current of the LD is sinusoidally modulated to realize the modulation of the wavelength. However, the light intensity of LD is also modulated, which affects the measurement accuracy. An all-fiber sinusoidal phase modulating LD interferometer for real-time displacement measurement is proposed where the influence of the intensity modulation is eliminated with a new algorithm. It is made clear that an optimal depth of the sinusoidal phase modulation (SPM) exists in the algorithm. Moreover, the SPM depth is locked at the optimal value by controlling the injection current with a feedback control system. The feasibility of the proposed interferometer for displacement measurement is verified by experiments. |
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