Boots – shoes – and leggings
Patent
1982-10-22
1985-08-20
Wise, Edward J.
Boots, shoes, and leggings
374102, 374108, 374170, 374183, G01K 108, G01K 720
Patent
active
045368511
ABSTRACT:
An electronic thermometer is particularly adapted for use as a fever thermometer and employs a unique temperature sensor configuration comprising a platinum temperature sensing resistor and tantalum nitride reference resistor both mounted on the same substrate. The resistors are selectively coupled to the input of a dual ramp integrator forming part of an analog to digital converter. Digital control circuitry causes the sensing resistor to be coupled to the input of the integrator during a first mode and causes the reference resistor to be coupled to the input during a second mode. Included in the digital circuitry is a first sensor memory and a second reference memory. These memories have stored therein a digital number indicative of the response of both resistors at a predetermined temperature obtained during initial calibration of the sensor and thermometer. The stored values are compared during the respective mode with the accumulated count in a clock counting circuit. If a match occurs the electronics advance the sequence to enable any excess count occurring during the second mode to be monitored and eventually displayed as manifesting the measured temperature. The digital electronics controls the measurement process in a sequential manner to assure accuracy and stability of the final reading. The circuitry enables a display of the last measured temperature prior to making a new measurement, and further includes circuitry for monitoring the level of a lithium battery source which is permanently sealed within the unit and to permanently disable the unit when the source is no longer capable of providing sufficient voltage to secure accuracy.
While a fever thermometer for home or hospital use is disclosed, the techniques are applicable for other types of temperature measurements; such as laboratory equipment, monitoring, laboratory and industrial controllers, indoor or outdoor thermometers for the home or office.
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Germanton Charles
Germanton Damon
Weiss Donald
Plevy Arthur L.
Wise Edward J.
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