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Modified Phase-Shift Measurement Technique to Improve Laser-Range Finder Performance

Mohammad Nejad Shahram نويسنده , Fasihi Kiazand نويسنده , Olyaee Saeed نويسنده

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In this study, a new technique for improving the performance of laser phase-shift range finders is presented. The phase measurement is performed by using a new method to extract the phase-shift data from the peak of the received and transmitted intermediate frequency signal amplitudes. The pulse-width modulation is used to minimize the noise effects of electronic circuits and enhance the accuracy of signal amplitude measurement. The two most advantages of the proposed system over others are its ability of proper isolation which reduces crosstalk and its independency to the frequency thermal drift. Theoretical calculations and experimental results have shown accuracy better than 2 mm over measuring distance range of 0.3-163 m.

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