A compact and simple distance meter based on self-coupling effect of semiconductor laser has been devel-oped. Using the interference in the laser resonator with the light scattered at the object surface, the distance sensor is composed of only a laser diode and a lens. But the operating wavelength of semiconductor laser varies with the surrounding temperature. Then the method of self-correction using Michelson interferom-eter is studied. This sensor is capable of measuring a distance stably even if the temperature varies. The measurement range is from 20cm to 120cm, and the measurement error is below 0.6 percent.
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