Title: Two-color photoelectric detectors having an integral filter

Abstract: Two photoelectric detector elements, having substantially different response wavelengths, are mounted in a housing in cascade relationship. The outer element is selected to be transparent to the response wavelength of the inner element and it is provided with an integral filter that is transmissive at the response wavelength of the inner element. Anti-reflective coatings are used to minimize reflective losses.

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Inventors: Roschen, John (Irvine, CA, US)

Application Number: 554193
Filing Date: 1975-02-28
Publication_date: 1976-06-08
Assignee: Aeronutronic Ford Corporation (Blue Bell, PA)
Primary Class(es): 250/226 250/214.1, 250/339.01, 250/349, 250/352, 250/370.06, 250/370.15, 257/E25.006, 359/890
Other Classes:
US Patent Ref:

3107302	Oct, 1963	Coleman	250/211.
3770958	Nov, 1973	Krakow	250/339.

Other Refs:
Primary Examiner: La Roche, Eugene
Assistant Examiner:
Attorney: Sanborn; Robert D.