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《Laser & Infrared》 2011-01
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Based on the optical feedback self-mixing interference displacement measurement algorithm design and filtering

JI Jing-yi,YE Hui-ying,YU Yan-guang(School of Information Engineering,Zhengzhou University,Zhengzhou 450052,China)  
In order to measure the displacement under the condition of moderate optical feedback self-mixing interference,a displacement measuring method based on phase unwrapping is introduced.To improve the measurement accuracy,the paper studied the noise elimination methods for the signals observed from a self-mixing laser diode based sensing system.The proposed methods are applied to both the simulated and experimental sensing signals.The results presented in the paper validate its feasibility.As a consequence,the vibration trace of the target can be reconstructed with high accuracy using this sensing system.Through simulation,it can be seen that the vibration signal can be reconstructed correctly form the simulated optical feedback self-mixing interference signal with 10 dB noise.
【Fund】: 国家自然基金项目(No.60871031)资助
【CateGory Index】: TN248.4
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