Interferometric optical system for measuring linear or angular d

Details Interferometric optical system for measuring linear or angular d Interferometric optical system for measuring linear or angular d

1990-06-13

1992-02-18

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356349, 356375, G01D 534, G01B 902

Patent

active

050896989

ABSTRACT:
The system uses a monochromatic radiation source (1) and an acousto-optic modulator (2), which acts as a Bragg modulator and is driven by a frequency which is caused to periodically vary. The modulator emits a first beam having the same wavelength as the source and a second beam, whose wavelength and emission direction vary with the modulating frequency and which is collimated. For measuring angular displacements, the collimated beam is recombined with the first beam after traversing a plate (5) with parallel and plane faces integral for the rotation with a moving device, and a photodetector (12) generates a beat signal whose frequency depends on the angular position of the plate (5). For measuring linear displacements, the two beams are directly sent onto a detector (12) integral with the moving device.

REFERENCES:
patent: 4395123 (1983-07-01), Minott
patent: 4410268 (1983-10-01), Tamaki
patent: 4710026 (1987-12-01), Magome et al.
patent: 4848908 (1989-07-01), Huang

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