Remote Low-Coherence Fiber Vibrometer With Wide Dynamic Range

IEEE Photonics Journal

Jian Chen¹  Shenglai Zhen¹  Xiaoguang Wang²  Benli Yu²  Hui Li² 

[1] Manipulation of Minist. of Educ., Anhui Univ., Hefei, China;;Key Lab. of Opto-Electron. Inf. Acquisition &

关键词: low coherence;    remote;    vibrometer;   

DOI  :  10.1109/JPHOT.2015.2425302

来源: DOAJ

【 摘 要 】

We present a remote low-coherence fiber vibrometer, which is composed of a hybrid configuration of Mach-Zehnder and Sagnac interferometer. In the interferometer, the signal and reference beams travel along the same path but in opposite directions. Owing to the fiber differential interferometric theory and a passive demodulation algorithm, absolute amplitude at a distance more than 1 m could be measured. The experimental results demonstrate that the vibrometer has a wide dynamic range for amplitude measurement from 4.34 pm to 2.43 mm. The deviation of measured amplitude is less than 0.8 dB, and the frequency response range is 30 Hz-11 kHz. The proposed method is potentially suitable for applications that require noncontact and high-dynamic-range measurements.

【 授权许可】

Unknown