Noncontact fiber optic vibrometer

Pepe G. Davis; Jeff Bush

doi:10.1117/12.372983

9 December 1999 Noncontact fiber optic vibrometer

Pepe G. Davis, Jeff Bush

Proceedings Volume 3860, Fiber Optic Sensor Technology and Applications; (1999) https://doi.org/10.1117/12.372983
Event: Photonics East '99, 1999, Boston, MA, United States

Abstract

A novel fiber optic vibrometer has been built and characterized. The vibrometer's optical design is based on the Sagnac interferometer. Due to the nature of the Sagnac's optical configuration, the optical phase shift induced by the surface being probed is differentiated, and therefore results in a measured optical phase shift that is directly proportional to the velocity of surface. The path matched Sagnac design eliminates the need for a coherent light source used in laser doppler vibrometers and offers great design flexibility for tuning the vibrometer's frequency response and dynamic range. A fiber optic Sagnac vibrometer was built and operated with a modulation frequency of 100 kHz. The vibrometer's dynamic range exceeds 70 dB with a maximum velocity of greater than 10 m/s and a noise floor of less than 1 micron/s/(root)Hz. Experimental results demonstrating the vibrometers performance will be presented.

Citation Download Citation

Pepe G. Davis and Jeff Bush "Noncontact fiber optic vibrometer", Proc. SPIE 3860, Fiber Optic Sensor Technology and Applications, (9 December 1999); https://doi.org/10.1117/12.372983

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