OPTICAL HYDROGEN SENSOR

摘要

The present invention relates to an optical hydrogen sensor which comprises: (a) a sensing module including gasochromic thin film; (b) an optical module; and (c) an optical fiber which optically connects the sensing module and optical module. The optical module comprises (i) a light source which generates a light beam, (?) a light splitter which splits the light beam from the light source, (?) a collimating lens which converts the light beam split by the light splitter into parallel lights, (?) a quarter-wave plate which changes the polarizing direction of the parallel light beams having passed through the collimating lens by 90 °, (v) an object lens which collects the light beams that have passed through the quarter-wave plate, and (vi) a detector which detects the light reflected from the sensing module. The present invention applies an optical pickup such as a conventional CD-ROM or DVD-ROM, and consequently the optical hydrogen sensor can be smaller. Furthermore, time and costs needed for manufacture can be greatly cut down if a cheap optical pick-up device is simply changed and applied to the optical hydrogen sensor.