Ambient and perfusion normalized temperature detector
DCFirst Claim
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1. A body temperature detector comprising:
- a radiation sensor which views a target surface area of a body; and
electronics which compute an internal temperature of the body as a function of an ambient temperature and a sensed surface temperature, the function including a weighted difference of the sensed surface temperature and the ambient temperature, the weighted difference including a weighting factor which varies with the sensed surface temperature.
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Abstract
A body temperature detector is particularly suited to axillary temperature measurements of adults. The radiation sensor views a target surface area of the body and electronics compute an internal temperature of the body as a function of ambient temperature and sensed surface temperature. The function includes a weighted difference of surface temperature and ambient temperature, the weighting being varied with target temperature to account for varying perfusion rate. Preferably, the coefficient varies from a normal of about 0.13 through a range to include 0.09. The ambient temperature used in the function is assumed at about 80° F. but modified with detector temperature weighted by 20%.
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Citations
35 Claims
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1. A body temperature detector comprising:
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a radiation sensor which views a target surface area of a body; and electronics which compute an internal temperature of the body as a function of an ambient temperature and a sensed surface temperature, the function including a weighted difference of the sensed surface temperature and the ambient temperature, the weighted difference including a weighting factor which varies with the sensed surface temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A body temperature detector comprising:
- a radiation sensor which views a target surface area of a body; and
electronics which compute an internal temperature of the body as a function of an ambient temperature and a sensed surface temperature, including a weighted difference of the sensed surface temperature and the ambient temperature, the weighted difference including a weighting factor of about 0.13. - View Dependent Claims (15)
- a radiation sensor which views a target surface area of a body; and
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16. A body temperature detector comprising:
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a radiation sensor which views a target surface area of a body; and electronics which compute an internal temperature of the body as a function of an ambient temperature and a sensed surface temperature, wherein the ambient temperature within the function is an assumed ambient temperature. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 35)
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25. A body temperature detector comprising:
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a radiation sensor which views a target surface area of a body; and electronics which compute an internal temperature of the body as a function of ambient temperature and a sensed surface temperature, the function including a weighted difference of the sensed surface temperature and the ambient temperature, the weighted difference including a weighting factor which is an approximation of h/pc where h is a heat transfer coefficient between the target surface and ambient, p is perfusion rate and c is blood specific heat and h/pc varies over a range of at least 0.09 to 0.13 with the sensed surface temperature, and the ambient temperature being an assumed ambient temperature modified as a function of a sensed detector temperature, a change in the assumed ambient temperature relative to change in the sensed detector temperature being less than 0.5. - View Dependent Claims (26, 27, 28)
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29. A method of detecting body temperature comprising:
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detecting radiation from a target surface area of a body; computing an internal temperature of the body as a function of an ambient temperature and a sensed surface temperature, the function including a weighted difference of the sensed surface temperature and the ambient temperature, the weighted difference including a weighting factor which varies with the sensed surface temperature; and providing a display of the internal temperature. - View Dependent Claims (30, 31)
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32. A method of detecting body temperature comprising:
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detecting heat flux from a target surface area of a body; computing an internal temperature of the body as a function of an ambient temperature and a sensed surface temperature, the ambient temperature within the function being an assumed ambient temperature; and providing a display of the internal temperature. - View Dependent Claims (33, 34)
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Specification