Optics: measuring and testing – Lamp beam direction or pattern
Patent
1994-06-29
1995-10-17
Rosenberger, Richard A.
Optics: measuring and testing
Lamp beam direction or pattern
G01J 100
Patent
active
054595657
ABSTRACT:
A light or laser beam analyzer uses a rotating drum with circumferential knife-edges or slits that interrupt the beam. Inside the drum is a light intensity detector, connected to a processor which reconstructs the beam waist parameters based upon the cut profiles. The knife-edges or slits are disposed at three or more different angles to the drum rotation axis. An attenuation filter is removably mounted inside the drum, where it introduces no distortion into the light measurement. The beam is diverted from the beam line and brought to the drum by a retro-reflector which is slidably mounted along a track parallel to the beam line. The folded path allows the use of a long-focal length lens such as a simple plano-convex type. The lens is demountable for making direct measurements, and an opening is provided in the drum for passing the unfocused beam through onto the detector.
REFERENCES:
patent: 2704009 (1955-03-01), Haeseler
patent: 4173398 (1979-11-01), Okamoto et al.
patent: 5064284 (1991-11-01), Johnston, Jr. et al.
patent: 5069527 (1991-12-01), Johnston, Jr.
patent: 5078491 (1992-01-01), Johnston, Jr.
International Oraganization for Standardization. "Optics and optical instruments Tests methods for laser beam parameters: Beam widths, divergence angle and beam progagation factor." Document ISO/TC 172/SC 9/WG 1N 56. 26 Nov. 1993.
Duma Optronics, Ltd.
Rosenberger Richard A.
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