Passive infrared detector
First Claim
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1. An infrared detector, comprising:
- a pyroelectric detector having first and second sensing elements;
an aperture stop; and
a Fresnel lens array.
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Abstract
An infrared detector (301) is provided which comprises a pyroelectric detector (303) having first and second sensing elements (345), an aperture stop (311), and a Fresnel lens array (305). The detector may be used as a passive infrared sensor unit for detecting intrusion into large openings.
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Citations
25 Claims
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1. An infrared detector, comprising:
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a pyroelectric detector having first and second sensing elements; an aperture stop; and a Fresnel lens array. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An infrared detector, comprising:
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a window; first and second sensing elements disposed on a first side of a window; an aperture stop disposed on a second side of a window; and a Fresnel lens array; wherein the Fresnel lens array has a finite focal length. - View Dependent Claims (21, 22, 23, 24, 25)
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Specification