Non-contact lateral displacement sensor and extensometer system

Details Non-contact lateral displacement sensor and extensometer system Non-contact lateral displacement sensor and extensometer system

1988-01-14

1989-10-10

Willis, Davis L.

Optics: measuring and testing

Material strain analysis

By light interference detector

356349, 356351, G01B 902

Patent

active

048727512

ABSTRACT:
A lateral movement sensing system which utilizes a two-frequency laser to provide two laser beams to illuminate a surface of a laterally moveable body. A beam splitter divides the two-frequency laser into two beams, and the system detects the modulation frequency of the scattered light when the laterally moveable body is moving. This detected modulation frequency is compared to the frequency difference between the two beams. The phase difference between the detected modulation frequency and the difference frequency represents units of lateral displacement of the laterally moveable body.

REFERENCES:
patent: 4031746 (1977-06-01), Furuta et al.
patent: 4432239 (1984-02-01), Bykov
patent: 4710026 (1987-12-01), Magome et al.

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