Multi-beam heterodyne laser Doppler vibrometer

Details Multi-beam heterodyne laser Doppler vibrometer Multi-beam heterodyne laser Doppler vibrometer

2006-10-03

2006-10-03

Toatley, Jr., Gregory J. (Department: 2877)

Optics: measuring and testing

By light interference

Having light beams of different frequencies

Reexamination Certificate

active

07116426

ABSTRACT:
A multi-beam laser Doppler vibrometer simultaneously measures velocity, displacement, and vibration history of multiple locations on an object. A beam of coherent light is split into an object beam and a reference beam. The object beam is divided into a plurality of object beams to simultaneously illuminate multiple locations on the object under inspection. The reference beam is frequency shifted and split into a corresponding plurality of frequency-shifted reference beams. A portion of each object beam is reflected by the object as a modulated object beam. The plurality of modulated object beams are collected and respectively mixed with the plurality of frequency-shifted reference beams to provide a plurality of beam pairs. Each beam pair may be focused onto a photodetector or an optical fiber connected to a photodetector.

REFERENCES:
patent: 4554836 (1985-11-01), Rudd
patent: 5106192 (1992-04-01), Tucker et al.
patent: 6972846 (2005-12-01), Lal et al.
patent: 2372097 (2002-08-01), None
patent: 2372097 (2002-08-01), None
Cupido, E., D. Smith, S. Morel, A Novel Multipoint Laser Doppler Vibrometer, paper from http://www.ometron.com/ometron/default.html, and presented at ISMA 2002.

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