Electronic thermometer

Details Electronic thermometer Electronic thermometer

1988-10-25

1989-10-17

Cuchlinski, Jr., William A.

Thermal measuring and testing

Temperature measurement

By a vibratory effect

374184, 331 66, 331 68, 336DIG2, G01K 1126, G01K 732

Patent

active

048742520

ABSTRACT:
An electronic thermometer has an oscillator, the frequency determining element of which is a temperature sensitive piezoelectric element (2), used as a measuring sensor, which is located inside a sealed housing (3). The piezoelectric element is provided with two termial electrodes (4, 5) which are galvanically separated from the oscillator circuit bia an inductively coupled pair of coils (6, 7); the coil (6) connected to the terminal electrodes is tightly encompassed by the housing. An evaluation unit (10) for detecting the temperature is connected to the oscillator circuit.

REFERENCES:
patent: 3303701 (1967-02-01), Matsuura et al.
patent: 3338100 (1967-08-01), Takami
patent: 3391576 (1968-07-01), Takami et al.
patent: 3421374 (1969-01-01), Wieting et al.
patent: 3452597 (1969-07-01), Grady, Jr.
patent: 3519924 (1970-07-01), Burton
patent: 3917970 (1975-11-01), Sidor et al.
patent: 4377733 (1983-03-01), Yamaguchi et al.

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