Filter wheel and method using filters of varying thicknesses
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United States of America Patent
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Aug 17, 1999
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N/A
app pub date -
Jun 11, 1997
filing date -
Jun 11, 1997
priority date (Note) -
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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.
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