Temperature sensing probe for microwave ovens

Details Temperature sensing probe for microwave ovens Temperature sensing probe for microwave ovens

1979-04-09

1980-12-09

Yasich, Daniel W.

Measuring and testing

Gas analysis

Moisture content or vapor pressure

219 1053B, G01K 0716, H05B 0680

Patent

active

042377315

ABSTRACT:
A high impedance four wire temperature sensing system is comprised of a thermistor or other sensor and four leads such that a constant current is impressed on the sensor via two leads and the voltage across the sensor is read via the other two. The sensor and leads have microwave surface resistivity much higher than impedance levels in microwave ovens so that negligible microwave energy is coupled to the sensing system. The high resistance leads in a rigid probe to be inserted into the food and in a flexible cable are electrically conductive iron oxide magnetic tape or are deposited conductors.

REFERENCES:
patent: 2540036 (1951-01-01), Spencer
patent: 2657580 (1953-11-01), Schroeder
patent: 3721900 (1973-03-01), Andrews
patent: 3794914 (1974-02-01), Ashlan
patent: 3896373 (1975-07-01), Zelby
patent: 3974696 (1976-08-01), Fitzmayer
patent: 4009359 (1977-02-01), Tallmadge et al.
patent: 4023093 (1977-05-01), Ashlan
patent: 4035787 (1977-07-01), Hornung
patent: 4081645 (1978-03-01), Jares et al.
patent: 4086813 (1978-05-01), Meek et al.
Publication: "Electrical Measurement in Theory and Application", A. W. Smith, PhD., 4th Edition., McGraw Hill Book Co., 1948, (pp. 119, 152).
Publ. "Development of Electric & Magnetic Near-Field Probe", by Frank M. Greene, Dept. of Commerce 1/1975. pp. 6-8, 38-44.

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