Abstract

Vibration analysis is a widely used technique in industry for the nondestructive inspection and metrology of mechanical structures. Nondestructive inspections such as optical methods present many advantages over conventional techniques, Eye-safe operation of the device is essential. Coherent detection can be a potential candidate to design a vibration analysis device. However, its field-of-view rules by the antenna law is very small at this wavelength. The operation of such a device requires a perfect optical alignment between the local oscillator and the signal to be detected.

© 1996 Optical Society of America