Heterodyne interferometer

Details Heterodyne interferometer Heterodyne interferometer

1987-01-12

1989-05-30

Hindenburg, Max

Surgery

Truss

Pad

356351, 73657, A61B 510

Patent

active

048341118

ABSTRACT:
This invention concerns a heterodyne interferometer for measuring the amplitude of vibration of a vibrating object. The invention is particularly useful for measuring the amplitude of vibrations of objects having reflectivities below about 0.02% or for measuring vibrations amplitudes below about 10.sup.-17 cm.
The invention comprises a laser and a beam splitter for producing an object light wave and a reference light wave; at least one modulator for changing the frequencies of the object light wave and the reference light wave thereby producing a predetermined offset; means for directing the object light wave onto the vibrating object; and a photodetector for producing, at a frequency equal to the predetrmined offset, a beat signal which varies according to variations in the interference resulting from combining the reflected object light wave and the reference light wave.

REFERENCES:
patent: 4172382 (1979-10-01), Murphy et al.
patent: 4208128 (1980-06-01), Thompson et al.
patent: 4422764 (1983-12-01), Eastman
patent: 4554836 (1985-11-01), Rudd
patent: 4643575 (1987-02-01), Hazeltine et al.
patent: 4681447 (1987-07-01), Davidsen

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