Dynamical Characteristics of a Fiber-Optic Strain Gauge by a Single-Mode Fiber-Optic Mach-Zehnder Interferometer

단일모드 광섬유 Mach-Zehnder 간섭계를 이용한 광섬유 스트레인 게이지의 동적 특성

A single mode fiber-optic Mach-Zehnder interferometer for the measurement of strain is described. A fiber-optic strain gauge with great resolution and wide measurement range is realized. In order to varify the dynamic response, the measurements of strain below 1涅 with frequency range 5-50Hz are compared with a semiconductor strain gauge. We report theoretical evaluation for mechanical analysis, PZT-plate, the phase change in a fiber-optic strain gauge and a semiconductor strain gauge. The dynamical characteristics of a fiber-optic strain gauge and a semiconductor strain gauge output siganl show equivalent behavior. This result is shown in very good usage as the dynamical measurement of the low strain below 1涅 by this system.