自己結合型距離センサの光ファイバを用いた自己補正に関する研究

Abstract

A compact distance sensor based on self-coupling effect of semiconductor laser has been developed. 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 and the injection current. Then the method of self-correction using Michelson interferometer which always monitors the change of operating wavelength is studied. Using a fiber, the interferometer is separated from the sensor head to miniaturize the sensor head. As a result, the fluctuation for temperature change of 10 to 30℃ decreases from 4.4% to 0.5%. It is possible to measure a distance without an affect of surrounding temperature by the self-correction.