Abstract
A fiber-optic vibration measurement technique based on the wavefront-splitting interferometry is presented in this paper. Due to a small divergence angle of Gaussian laser beam emitting from a single-mode fiber, the sensing beam propagating toward the specimen has an incident angle of nearly 90°, so that the reflection coefficient of specimen surface is relatively high even for low-refractive-index materials. In preliminary tests, overhead-projector transparency was used to demonstrate the vibration measurement with our fiber-optic vibration sensor up to 4 kHz. The Young's modulus of the transparency was also determined by using the vibration method, and the result agreed well with that measured by using a conventional testing machine.
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