Optics: measuring and testing – Lamp beam direction or pattern
Patent
1988-12-08
1990-11-06
Evans, F. L.
Optics: measuring and testing
Lamp beam direction or pattern
350 365, G01J 104
Patent
active
049681389
ABSTRACT:
A system for monitoring intensity before, during, and after holographic exposure includes a monitoring assembly within an exposure beam and intermediate a light source and a hologram recording assembly. With the monitoring assembly in the exposure beam, a monitoring beam is produced that is directed towards detection elements located outside of the exposure beam. At the same time, the monitoring assembly allows the exposure beam to pass therethrough and onto the hologram recording assembly. The monitoring assembly may include a reflection hologram with an effective shape which is different from the supporting substrate, or glass substrates with an internal reflecting surface. In either event, the exposure beam remains undistorted. The spatial arrangement among the light source, hologram recording assembly, and detection elements are such that a reflected beam from the hologram recording assembly is directed away from the detection elements to avoid incorrect intensity monitoring.
REFERENCES:
patent: 4458977 (1984-07-01), Arns et al.
patent: 4458978 (1984-07-01), Arns et al.
patent: 4478490 (1984-10-01), Wreede et al.
Scott James E.
Wreede John E.
Alkov Leonard A.
Denson-Low Wanda K.
Evans F. L.
Hughes Aircraft Company
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