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Appl Opt. 2007 Mar 20;46(9):1486-91.

Self-mixing interferometry based on a double-modulation technique for absolute distance measurement.

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Jiangsu Key Lab on Opto-Electronic Technology, School of Physical Science and Technology, Nanjing Normal University, Nanjing 210097, China.


A new, to the best of our knowledge, method for the measurement of the absolute distance of a remote target based on the laser diode self-mixing interferometry is presented. A double-modulation technique is introduced to improve the measurement resolution. Wavelength modulation of the laser beam is obtained by modulating the injection current of the laser diode. Phase modulation of the laser beam is obtained by an electro-optic crystal in the external cavity. Absolute distance of the external target is determined by the Fourier analysis method. Theoretical analysis and numerical simulations are given. Experimental results show that a resolution of +/-0.3 mm can be achieved for absolute distance ranging from 277 to 477 mm.


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