Optical: systems and elements – Mirror – Plural mirrors or reflecting surfaces
Patent
1996-05-31
1999-02-02
Henry, Jon
Optical: systems and elements
Mirror
Plural mirrors or reflecting surfaces
359862, 359863, 359884, 359589, 359584, 359585, 359614, G02B 508, G02B 7182, G02B 510, G02B 526
Patent
active
058673296
ABSTRACT:
An optical filter that uses multiple reflections to provide spectral bandpass filtering of ultraviolet, visible and infrared radiation with a very high transmission of wavelengths within a selected passband coupled with exceptional off-band rejection. The reflection filter uses dielectric-coated spherical reflectors or mirrors manufactured with absorbing glass substrates. The multiple-pass feature of the reflection filter is achieved using a traditional long-path absorption cell such as a White Cell or Wilkes Cell. The light transmitted through the reflection filter is only that light which has undergone multiple reflections as the wavelengths of high mirror reflectivity reflect off the dielectric-coated substrates. All remaining light at wavelengths corresponding to high mirror transmission is attenuated by absorption in the mirror substrate. The degree of attenuation of light at wavelengths corresponding to high mirror transmission can be chosen simply by selecting an appropriate number of reflections in the multiple-pass reflection filter.
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Literature from the Foxboro Company, entitled "Infrared Gas Analysis--The Wilks Variable Long Path Gas Cells", 8 pages, copyright .COPYRGT. 1987.
Huston Alan L.
Justus Brian L.
Henry Jon
Jameson George
McDonnell Thomas E.
Sikd-er Mohammad Y.
The United States of America as represented by the Secretary of
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