ULTRASONIC MEASURING APPARATUS USING RESONATOR LENGTH SELECTIVE OPTICAL FIBER INTERFEROMETER

摘要

PURPOSE: An ultrasonic measuring device using an optical fiber interferometer of a resonator length selective type is provided to increase signal sensitivity to ultrasonic wave, and to reduce noise factors. CONSTITUTION: An ultrasonic measuring device using an optical fiber interferometer of a resonator length selective type comprises a collecting lens(3), a resonating unit, an input window(10), and an input translator(11). The collecting lens collects scattered light occurred by a laser beam(2) irradiated to an object(1). The resonator unit outputs coherent light through multiple reflection of the collected scattered light. The input window is arranged between a reflection mirror(4) and an optical fiber, and has an opening for selectively passing the scattered light. The input translator fixes an input unit of the optical fiber.