Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1975-02-26
1977-05-10
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
73362AR, 128 21R, 307308, 219505, 338 28, 324DIG1, 324 62, 324 63, 324 65R, G01R 2700
Patent
active
040230945
ABSTRACT:
In an electronic thermometer a probe having a resistance which varies in accordance with the temperature of the region being sensed is connected to a resistance bridge having characteristics for determining and indicating the resistance of the probe. The temperature sensing element in the probe is constructed of materials whose characteristics are intrinsic and highly stable. The temperature sensing element is of small mass and is thermally isolated from the body of the probe so an accurate temperature can be measured in less than one second.
The resistance bridge can be in one of two states depending upon the direction of imbalance of the bridge. These two states are respectively characterized by a high or low output voltage which is relatively unaffected by the degree of imbalance. The transition between the two voltages is sharp, continuous, and well defined. In the low voltage state, the bridge has an extremely low power consumption.
The bridge has a precision impedance matching means which permit optimal mechanization with a wide range of components. A sheath for covering the probe can be a one-piece plastic part simply constructed at a low cost thereby making it economically disposable.
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patent: 3340427 (1967-09-01), Bisso
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patent: 3494196 (1970-02-01), Moussette
patent: 3545273 (1970-12-01), Friberg et al.
patent: 3620082 (1971-11-01), Peters
patent: 3732443 (1973-05-01), Lovrenich
Krawczewicz Stanley T.
Roston Ellsworth R.
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