Electronic thermometer
First Claim
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1. Electronic apparatus to measure temperature comprising:
- means for varying an electrical parameter representing the temperature being measured in accordance with a known delayed response, wherein said electrical parameter reaches a steady state value, said value being representative of a final temperature,means electrically connected to said parameter varying means for converting said electrical parameter to an alternating current signal during both a first and a second time period, the lengths of said time periods each being shorter than the time period required for said electrical parameter to reach said steady state value, andmeans for computing said final temperature by operating upon said alternating current signal converted during said first time period and said alternating current signal converted during said second time period before said electrical parameter reaches said steady state value.
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Abstract
An electronic apparatus to measure temperature which provides an accurate final temperature reading prior to the actual stabilization of the temperature sensor. An algorithm is provided which allows taking only two sensor temperature measurements at preselected times yet accurately predicts the sensor final or stabilization temperature. Temperature resistance varying signals are converted to temperature-frequency varying signals, clocked into an up/down counter, to compute final temperature which is displayed digitally. A thirty-second timing sequence is also digitally displayed for use when the invention is utilized for medical applications.
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Citations
15 Claims
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1. Electronic apparatus to measure temperature comprising:
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means for varying an electrical parameter representing the temperature being measured in accordance with a known delayed response, wherein said electrical parameter reaches a steady state value, said value being representative of a final temperature, means electrically connected to said parameter varying means for converting said electrical parameter to an alternating current signal during both a first and a second time period, the lengths of said time periods each being shorter than the time period required for said electrical parameter to reach said steady state value, and means for computing said final temperature by operating upon said alternating current signal converted during said first time period and said alternating current signal converted during said second time period before said electrical parameter reaches said steady state value. - View Dependent Claims (2, 3, 4, 5, 6)
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7. Electronic thermometer apparatus comprising:
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sensor means for varying an electric parameter in accordance with a temperature being sensed said sensor means in varying said electric parameter has a known response delay described by an exponential curve wherein intermediary values of said electric parameter are produced before the final value of the electric parameter representative of the actual temperature being sensed is produced, means connected to said sensor means for converting said intermediary values of the electric parameter to alternating current signals, means for enabling said converting means at two preselected times, and means for computing said final value of the electric parameter representative of the actual temperature being sensed in accordance with said known exponential response curve by operating upon the alternating current signals converted at said two preselected times, wherein said computed final value is computed in advance of said sensor means reaching said final value. - View Dependent Claims (8, 9, 10, 11)
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12. A temperature computing circuit in an electronic thermometer comprising:
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means for sensing a temperature condition and producing a signal representing said temperature condition, said signal being produced according to a known exponential delayed response curve whereby intermediate signals describing said curve are produced before the signal representing the actual temperature condition sensed is produced; means connected to said sensing means and producing means for obtaining two of said intermediate signals and for computing said final signal which will be eventually produced before it is actually produced by said sensing and producing means, said computation involving a solution of said exponential curve using said two intermediate signals; and means connected to said computing means for displaying a temperature value in response to said computed signal. - View Dependent Claims (13, 14, 15)
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Specification