Phase grating having an unprotected relief structure with a grat

Details Phase grating having an unprotected relief structure with a grat Phase grating having an unprotected relief structure with a grat

1996-01-26

1997-12-09

Turner, Samuel A.

Optics: measuring and testing

By dispersed light spectroscopy

Utilizing a spectrometer

250237G, 359569, G01B 902

Patent

active

056965842

ABSTRACT:
An uncovered unprotected phase grating includes a substrate which has a relief structure. The relief structure includes a high-refraction material so that even if soiled with impeding ambient media an adequate difference in the index of refraction exists and the diffraction effect is preserved.

REFERENCES:
patent: 4776701 (1988-10-01), Pettigrew
patent: 4780175 (1988-10-01), Taneya et al.
patent: 4828356 (1989-05-01), Hobrock et al.
patent: 5046827 (1991-09-01), Frost et al.
patent: 5240550 (1993-08-01), Boehnke et al.
Dissertation by Jorg Willhelm, "Photoelektrische Aufnehmer zur Messung von Lagearungen," p. 19, 1978.

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