Filter wheel and method using filters of varying thicknesses

Details Filter wheel and method using filters of varying thicknesses Filter wheel and method using filters of varying thicknesses

1997-06-11

1999-08-17

Hantis, K. P.

Optics: measuring and testing

By shade or color

With color transmitting filter

G01N 2125

Patent

active

059401834

ABSTRACT:
Apparatus for and a method of detection of light transmitted or reflected from a test object using any one of plural filters each with a unique center wavelength. To prevent chromatic aberration in non-collimated light passed through the filters, the thickness of each filter is unique, depending on its center wavelength.

REFERENCES:
patent: 2287322 (1942-07-01), Nelson
patent: 4979803 (1990-12-01), McGuckin et al.
patent: 5298989 (1994-03-01), Tsukahara et al.
patent: 5689341 (1997-11-01), Hayashi
Laser Focus World; "Have You Considered Using Variable Bandpass Filters" Sep. 1989, pp. 1-4.
Translation of German DE 3743584.1, Dec. 22, 1987, Ritzl.

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