Fiber optic micro-displacement sensor using coupler

Abstract

A simple technique is presented for the fiber optic displacement sensor using coupler, using multimode plastic 50:50 coupler based on intensity-modulated technique. We have measured very accurately the displacement of the order of 10 μm. The source in the IR region of wavelength 783 nm, output power of 3 mW and Laser drive of model-501 (Newport) and detector model-818-SL (Newport) are used for experimental setup. The displacement of 0-1 mm is quite interesting for the sensing. The sensor characteristics are measured at back slope. The working principle of the sensor is presented as well as experimentation results. The designed simplest sensor finds its application in industries as position control and micro displacement measurement in the hazardous region.