Radiation interference devices

Details Radiation interference devices Radiation interference devices

1983-01-20

1988-02-02

Buczinski, Stephen C.

Optics: measuring and testing

By particle light scattering

With photocell detection

356346, 356152, 455611, 455615, G01B 902, G01J 345, H04B 900

Patent

active

047226048

ABSTRACT:
An interference device for discriminating between radiation sources of differing coherence length comprises means to divide received radiation from a source into two components. A path difference, defining a coherence length cut-off, is introduced into the path of one component and the components are brought together for interference. The recombined light passes through a reticle with alternate opaque and tranparent bars and an optical band-pass filter to a detector. Interference fringes present in the plane of the reticle are swept across the reticle by the action of the collection optical system of the device which includes a scanning rotating mirror. Two similar devices can be arranged for band-pass coherence length filtering and when used in conjunction with a light soruce whose coherence is modulated the device can be used for signalling.

REFERENCES:
patent: 3622790 (1971-11-01), Zavodny
patent: 3699445 (1972-10-01), Kinsel
patent: 4085319 (1978-04-01), Deitz
patent: 4095900 (1978-06-01), Murphy et al.
patent: 4147424 (1979-04-01), Foster et al.
patent: 4167329 (1979-09-01), Jelalian
patent: 4170416 (1979-10-01), Fencil
patent: 4222667 (1980-09-01), Layne
G. A. Vanasse et al., Optical Engineering, Jul.-Aug. 1979, vol. 18, No. 4, p. 403.

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