Temperature detecting system and method
First Claim
1. A temperature detection system, comprising:
- at least one pyroelectric infrared (IR) detector;
an optical scanning assembly associated with the pyroelectric IR detector and configured to scan the detector field of view across a monitored area, whereby the pyroelectric IR detector receives IR radiation from successive objects in the monitored area which are within the field of view of the detector as it is scanned across the area;
an AC amplifier high-frequency cut-off raising circuit associated with the pyroelectric IR detector for outputting a detector output signal; and
a signal processing module for receiving the detector output signal and configured to produce an output profile of the relative temperatures of objects in the monitored area.
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Accused Products
Abstract
A temperature detection system for detecting relative or absolute temperatures of objects in a monitored area has at least one infrared (IR) detector and at least one optical element for directing IR radiation within a detector field of view onto the infrared detector. A scanning system is configured to produce relative movement between the optical element and the IR detector such that the detector field of view is scanned across a monitored area to receive IR radiation from objects in the monitored area. A signal processing module for receiving the detector output signal is configured to produce an output profile of the relative temperatures of objects in the monitored area. The IR detector may be a pyroelectric detector.
60 Citations
39 Claims
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1. A temperature detection system, comprising:
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at least one pyroelectric infrared (IR) detector; an optical scanning assembly associated with the pyroelectric IR detector and configured to scan the detector field of view across a monitored area, whereby the pyroelectric IR detector receives IR radiation from successive objects in the monitored area which are within the field of view of the detector as it is scanned across the area; an AC amplifier high-frequency cut-off raising circuit associated with the pyroelectric IR detector for outputting a detector output signal; and a signal processing module for receiving the detector output signal and configured to produce an output profile of the relative temperatures of objects in the monitored area. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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2. A temperature detection system, comprising:
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at least one pyroelectric infrared (IR) detector; an optical scanning assembly associated with the pyroelectric IR detector and configured to scan the detector field of view across a monitored area, whereby the pyroelectric IR detector receives IR radiation from successive objects in the monitored area which are within the field of view of the detector as it is scanned across the area; a transconductance circuit associated with the pyroelectric IR detector for outputting a detector output signal; and a signal processing module for receiving the detector output signal and configured to produce an output profile of the relative temperatures of objects in the monitored area.
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28. A method of detecting relative temperatures of objects in a monitored area, comprising:
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scanning the field of view of at least one pyroelectric infra red (IR) detector repeatedly across a monitored area, whereby the output of the pyroelectric IR detector represents the variation in IR radiation intensity produced by objects in the monitored area; enhancing the frequency response of the IR detector with a frequency enhanced amplifier including an AC amplifier high-frequency cut-off raising circuit receiving the detector output signal and outputting an enhanced detector output; and processing the enhanced detector output of the IR detector to produce a scan data output corresponding to the IR detector output signal versus time/position in the monitored area. - View Dependent Claims (29, 30, 31, 32, 33, 34, 35)
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36. A temperature detection system, comprising:
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at least one infrared (IR) detector; an optical scanning assembly associated with the IR detector and configured to scan the detector field of view across a monitored area, whereby the IR detector receives IR radiation from successive objects in the monitored area which are within the field of view of the detector as it is scanned across the area, the monitored area including at least one reference object; a temperature transducer attached to the reference object, the temperature transducer for outputting a detector output signal; a signal processing module for receiving the detector output signal and configured to produce an output profile of the relative temperatures of objects in the monitored area, to determine a first IR radiation intensity of the object based on the output of the temperature transducer and a second, relative radiation intensity produced by scanning the IR detector over the reference object, whereby the IR radiation intensity difference can be used to determine the temperature of an object in the monitored area. - View Dependent Claims (37, 38, 39)
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Specification