Pyroelectric intrusion detection in motor vehicles
First Claim
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1. A system for detecting the presence of a human in a compartment of a vehicle comprising:
- a thermal sensor assembly mounted in the compartment of the vehicle and adapted to sense a thermal characteristic of the compartment, said thermal sensor assembly comprising a pyroelectric sensor and a control coupled to said pyroelectric sensor, said control generating a signal as a function of a change in the thermal characteristic of the compartment as sensed by the pyroelectric sensor, wherein a filter element comprising a multiple film interference filter is disposed in said thermal sensor assembly in front of said pyroelectric sensor, said filter element adapted to filter radiation of a particular wavelength incident on said thermal sensor assembly, wherein said filter element comprises at least one of filter material selected from the group consisting of;
Ge, Si, ZnS, CdS and Polyolefin, and wherein said filter element principally transmits radiation in the 8-14 micron wavelength range, and wherein said control comprises an electronic band-pass filter, said electronic band-pass filter passing frequencies greater than 0.01 Hz and less than 100 Hz.
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Abstract
Pyroelectric detector systems may be used in vehicles for security applications, such as intrusion detection and anti-theft alarms. The pyroelectric detectors are small in size, highly reliable and consume very low power. They can be physically and electrically integrated with other vehicle components, including rear-view mirror assemblies in automobiles, without incurring additional installation costs. They can also be easily integrated into aircraft cockpits.
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Citations
9 Claims
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1. A system for detecting the presence of a human in a compartment of a vehicle comprising:
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a thermal sensor assembly mounted in the compartment of the vehicle and adapted to sense a thermal characteristic of the compartment, said thermal sensor assembly comprising a pyroelectric sensor and a control coupled to said pyroelectric sensor, said control generating a signal as a function of a change in the thermal characteristic of the compartment as sensed by the pyroelectric sensor, wherein a filter element comprising a multiple film interference filter is disposed in said thermal sensor assembly in front of said pyroelectric sensor, said filter element adapted to filter radiation of a particular wavelength incident on said thermal sensor assembly, wherein said filter element comprises at least one of filter material selected from the group consisting of;
Ge, Si, ZnS, CdS and Polyolefin, and wherein said filter element principally transmits radiation in the 8-14 micron wavelength range,and wherein said control comprises an electronic band-pass filter, said electronic band-pass filter passing frequencies greater than 0.01 Hz and less than 100 Hz. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification
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Current AssigneeDonnelly Corporation (Magna International Incorporated)
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Original AssigneeDonnelly Corporation (Magna International Incorporated)
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InventorsAgrawal, Anoop, McCarthy, Kevin, Teowee, Gimtong
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Primary Examiner(s)TONG, NINA C
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Application NumberUS09/663,998Time in Patent Office869 DaysField of Search340/426, 340/425.5, 340/430, 340/555, 340/556, 340/567, 340/573, 340/429, 340/541, 340/565, 340/942, 307/10.2, 307/10.3, 307/10.4, 307/10.5, 180/167, 180/169, 180/287, 250/342, 250/DIG.1, 250/353, 250/338.3US Class Current340/426.1CPC Class CodesB60R 2325/304 BoatsB60R 25/1004 Alarm systems characterised...
