Photopic detector system and filter therefor
First Claim
Patent Images
1. A filter suitable for use with a detector, the filter comprising:
- an interference element that substantially reflects normally incident light over a band of near-infrared wavelengths and that substantially transmits normally incident light over visible wavelengths; and
an absorptive element that absorbs light non-uniformly over visible wavelengths, the absorptive element comprising a colorant dispersed in a polymeric matrix;
wherein the filter when combined with the detector yields a detector system whose relative response approximates a visual response of the human eye.
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Abstract
A detector system, filter therefor, and method of making same is disclosed. The filter includes an interference element having a reflection band disposed primarily in the near infrared, and having a high transmission over most of the visible region. The filter also includes an absorptive element that absorbs light non-uniformly over the visible region. The filter when combined with a semiconductor photodiode or other suitable detector yields a detector system whose spectral responsivity closely matches the visual response of the human eye.
74 Citations
29 Claims
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1. A filter suitable for use with a detector, the filter comprising:
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an interference element that substantially reflects normally incident light over a band of near-infrared wavelengths and that substantially transmits normally incident light over visible wavelengths; and
an absorptive element that absorbs light non-uniformly over visible wavelengths, the absorptive element comprising a colorant dispersed in a polymeric matrix;
wherein the filter when combined with the detector yields a detector system whose relative response approximates a visual response of the human eye. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of making a filter suitable for use with a detector, the method comprising:
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providing an interference element that reflects normally incident light over a band of near-infrared wavelengths and substantially transmits normally incident light over visible wavelengths;
loading an absorptive colorant that absorbs light non-uniformly over visible wavelengths into a resin;
shaping the resin to form an absorptive element; and
combining the interference element and the absorptive element to provide the filter;
wherein the filter when combined with the detector yields a detector system whose relative response for normally incident light approximates a visual response of the human eye. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29)
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Specification