Rotating Angle Sensor Based on Fiber Bragg Grating

• Main Authors: Pei-Tsung Tsai, 蔡佩璁
• Other Authors: Wen-Fung Liu
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/43364734578279626441

碩士 === 逢甲大學 === 電機工程所 === 99 === In this thesis we proposed three different packaged sensing structures based on fiber Bragg gratings with the characteristics of excellent linearity, fine resolution, nice stability, negligible hysteresis phenomenon, and arbitrary random rotational angle detection. For the first kind of sensor, the rotational angle fiber sensor consists of two FBGs glued axially on a metal rod surface to be bent by repulsion of a magnetic disk. Whenever an input force is exerted on the end of this sensor, the two FBGs are strained by a shaft rotation to result in their central wavelength shifts respectively. This sensor can be used to accurately detect random rotation angle in both static and dynamic conditions. For the second kind of sensor, the rotational position sensor is owing to its miniature size specifically beneficial for fitting in small rotary apparatus, and can especially act as a tiny rotating position sensor. The operation mechanism is mainly based on the difference between the wavelength shifts of two FBGs respectively caused by the bending strain of a cantilever corresponding to the rotating position of rotary shaft. On the other hand, the side-polished chirped fiber Bragg grating is further investigated for using in the measurement of stress, temperature and local pressure. Thus, the third kind of sensor is developed for the rotational angle sensor. The operation mechanism is based on the local pressure on the side polished chirped fiber Bragg grating through the application of transverse force.