Pyroelectric infrared detector
First Claim
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1. A pyroelectric infrared detector used in an intrusion detection system, the detector comprising:
- a housing having an opening;
a light transmissive filter covering the opening in the housing;
a group of at least two infrared transmissive pyroelectric layers, each layer having a top surface and a bottom surface, the top surface of each layer facing the opening, and each layer in the group of layers disposed in layered relation with respect to each other layer;
a substrate layer electrically connected to each pyroelectric layer in the group of layers, the substrate layer located such that the group of layers is between the substrate layer and the opening, the substrate layer comprising an electric circuit including a field-effect transistor for converting an impedance;
a plurality of electrodes, at least one electrode formed on each of the top and bottom surfaces of each of the pyroelectric layers for transmitting electric charges occurring on each of the top surfaces caused by thermal changes due to infrared incidence on each top surface; and
means for supporting the group of pyroelectric layers and the substrate layer at spaced intervals so that the substrate layer and the group of pyroelectric layers are free from mutual thermal influence.
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Abstract
A pyroelectric infrared detector used in the intrusion detection system, the detector including a housing having an opening, at least two infrared transmissive pyroelectric layers spaced to be mutually free from thermal influence; and a plurality of electrodes formed on the surfaces of each of the pyroelectric layer, the electrodes electrically connected to each other.
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Citations
16 Claims
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1. A pyroelectric infrared detector used in an intrusion detection system, the detector comprising:
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a housing having an opening; a light transmissive filter covering the opening in the housing; a group of at least two infrared transmissive pyroelectric layers, each layer having a top surface and a bottom surface, the top surface of each layer facing the opening, and each layer in the group of layers disposed in layered relation with respect to each other layer; a substrate layer electrically connected to each pyroelectric layer in the group of layers, the substrate layer located such that the group of layers is between the substrate layer and the opening, the substrate layer comprising an electric circuit including a field-effect transistor for converting an impedance; a plurality of electrodes, at least one electrode formed on each of the top and bottom surfaces of each of the pyroelectric layers for transmitting electric charges occurring on each of the top surfaces caused by thermal changes due to infrared incidence on each top surface; and means for supporting the group of pyroelectric layers and the substrate layer at spaced intervals so that the substrate layer and the group of pyroelectric layers are free from mutual thermal influence. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A pyroelectric infrared detector used in an intrusion detection system, the detector comprising:
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a housing having an opening for admitting light into the housing; a light transmissive filter for filtering the light entering the housing; at least two infrared sensors, each sensor comprising an infrared transmissive pyroelectric layer, wherein each layer has a top surface and a bottom surface, the top surface of each layer facing the opening and receiving the light thereon, and wherein the sensors are in layered relationship to each other within the housing; a substrate layer comprising an electrical circuit, the substrate layer located beyond the at least two sensors and electrically connected to each of the sensors for providing a detection signal; and means for supporting the at least two sensors and the substrate layer at spaced intervals so that the substrate layer and the at least two sensors are free from mutual thermal influence. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification