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Photocell array with multi-spectral filter

  • US 5,072,109 A
  • Filed: 03/07/1990
  • Issued: 12/10/1991
  • Est. Priority Date: 03/07/1990
  • Status: Expired due to Term
First Claim
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1. A combination of:

  • a. an optical thin film filter useful in the spatial and spectral separation of two or more transmitting bands of radiant energy which comprises;

    (1) a substrate having at least one surface for receiving coatings and which is substantially transparent to said radiant energy at the wavelength bands of interest;

    (2) a first coating on said substrate capable of transmitting two or more wavelength bands of interest and reflecting and/or absorbing all other out of band wavelengths; and

    ,b. at least two detectors or detector arrays, which are adjacently positioned in a path of filtered radiant energy which has passed through said first coating and said substrate, said detectors or detector arrays capable of detecting at least one wavelength band different from the wavelength band detected by the other detector or detector array, and each of said detectors or detector arrays provided with a coating, which coating is capable of both transmitting at least one wavelength band transmitted by said first substrate coating and transmitting at least one band that its respective detector or detector array is capable of detecting, said detector or detector array coating reflecting all other wavelength bands, wherein said detector or detector array coating is formed of a plurality of high and low index of refraction dielectric materials, arranged in multiple layers.

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