Diffusion device for compensating for non-uniform...

Details Diffusion device for compensating for non-uniform... Diffusion device for compensating for non-uniform...

G - Physics

02

B

73/53, 313/69, 8

G02B 5/02 (2006.01) G01J 1/04 (2006.01) G01J 3/02 (2006.01) G01N 21/25 (2006.01)

Patent

CA 1050795

ABSTRACT OF THE DISCLOSURE A compensation arrangement for a multi-beam spectrophotometer optical system of the type using a phot- multiplier tube whose cathode alternately or at different times receives physically space light beams emerging from reference and sample material. The spaced light beams pass through a diffuser plate into a light duct having mirror interior wal?s which interiorly multiply-reflect the emergent rays form the diffuser plate to provide uniform diffusion of the rays in the duct with minimum loss. The exit end of the duct faces the working area of the photo- multiplier tube cathode so that this cathode area is uniformly illuminated by the uniformly diffused rays, whereby the response of the photomultiplier tube is not affected by non-uniform sensitivity of different parts of the cathode working area.

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