OPTICAL FILTER FOR IMPROVED WHITE LIGHT IMMUNITY IN AN INTRUSION DETECTOR
First Claim
1. An optical filter device, comprising:
- a substrate having a plurality of coating layers on a surface of the substrate, the plurality of coating layers and the substrate being transmissive to a specified wavelength band of radiation; and
the plurality of coating layers on the substrate each having a specified coating thickness, and the plurality of coating layers causing destructive interference of radiation outside the specified wavelength band of radiation while the radiation within the specified wavelength band passes through the substrate and the plurality of coating layers.
1 Assignment
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Accused Products
Abstract
An optical filter device for filtering radiation energy includes a substrate having a plurality of coating layers which are both transmissive to a specified wavelength band of radiation. The plurality of coating layers on a surface of the substrate each have a specified coating thickness. The plurality of coating layers cause destructive interference and/or reflection of the radiation outside the specified wavelength band of the radiation while radiation within the specified wavelength band is passed through the substrate and the plurality of coating layers. The substrate or window/filter may be positioned in a housing between a receiving element such as a pyroelectric element and the radiation energy wherein the specified wavelength band of radiation passes through the substrate and plurality of coating layers to the pyroelectric element. A signaling device communicates a signal indicating when the radiation energy within the specified wavelength band reaches the at least one pyroelectric element.
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Citations
36 Claims
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1. An optical filter device, comprising:
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a substrate having a plurality of coating layers on a surface of the substrate, the plurality of coating layers and the substrate being transmissive to a specified wavelength band of radiation; and the plurality of coating layers on the substrate each having a specified coating thickness, and the plurality of coating layers causing destructive interference of radiation outside the specified wavelength band of radiation while the radiation within the specified wavelength band passes through the substrate and the plurality of coating layers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An optical filter device, comprising:
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a substrate having a plurality of coating layers on a surface of the substrate, the plurality of coating layers and the substrate being transmissive to a specified wavelength band of radiation; and the plurality of coating layers on the substrate each having a specified coating thickness, and the plurality of coating layers causing reflection of radiation outside the specified wavelength band of radiation while the radiation within the specified wavelength band passes through the substrate and the plurality of coating layers. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A pyroelectric sensing device, comprising:
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a housing; a substrate attached to the housing, the substrate having a plurality of coating layers on a surface of the substrate, the plurality of coating layers and the substrate being transmissive to a specified wavelength band of radiation; the plurality of coating layers on the substrate each having a specified coating thickness, and the plurality of coating layers causing destructive interference of radiation outside the specified wavelength band of radiation; at least one pyroelectric element positioned within the housing, and the substrate positioned between the at least one pyroelectric element and radiation, and the radiation within the specified wavelength band passes through the substrate and the plurality of coating layers to the at least one pyroelectric element for initiating an electrical signal. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
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23. A pyroelectric sensing device, comprising:
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a housing; a substrate attached to the housing, the substrate having a plurality of coating layers on a surface of the substrate, the plurality of coating layers and the substrate being transmissive to a specified wavelength band of radiation; the plurality of coating layers on the substrate each having a specified coating thickness, and the plurality of coating layers causing reflection of radiation outside the specified wavelength band of radiation; at least one pyroelectric element positioned within the housing, and the substrate positioned between the at least one pyroelectric element and radiation, and the radiation within the specified wavelength band passes through the substrate and the plurality of coating layers to the at least one pyroelectric element for initiating an electrical signal. - View Dependent Claims (24, 25, 26, 27, 28)
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29. A method for detecting intrusion, comprising:
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providing an optical filter device being transmissive to a specified wavelength band of radiation; applying a plurality of coating layers on the substrate each having a specified coating thickness; passing a specified wavelength band of radiation through the coating layers and the substrate; and interfering destructively with radiation outside the specified wavelength band of radiation using the plurality of coating layers. - View Dependent Claims (30, 31, 32, 33)
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34. A method for detecting intrusion, comprising:
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providing an optical filter device being transmissive to a specified wavelength band of radiation; applying a plurality of coating layers on the substrate each having a specified coating thickness; passing a specified wavelength band of radiation through the coating layers and the substrate; and reflecting radiation outside the specified wavelength band of radiation using the plurality of coating layers. - View Dependent Claims (35, 36)
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Specification