Food thermometer for microwave oven

Communications: electrical – Systems – Call station

Patent

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Details

73352, 73362AR, 99342, 99421TP, 219 1055E, G08B 2100, G01K 108, G01K 724

Patent

active

039757200

ABSTRACT:
Apparatus is disclosed for monitoring the internal temperature of food being cooked in the cooking cavity of a microwave oven with microwaves of a predetermined frequency having a predetermined wavelength .lambda.. The apparatus includes a needle-like temperature-sensing probe adapted for insertion into the food being cooked, the probe including a thermally-responsive electrical element positioned internally of the probe housing near the tip end. A flexible shielded cable connects the probe to circuitry responsive to thermally-induced changes in a characteristic of the electrical element, the cable shield being connected at one end to the probe housing and at the other end to a wall of the cooking cavity. The total effective electrical length of the probe and the cable, measured along the cable and probe from the cooking cavity wall to the distal end of the probe, is selected to be an integer multiple of one-half the predetermined wavelength .lambda.. Resonant conditions, high attendant induced currents along the probe and cable, and direct heating of the probe and cable by the microwave energy are thereby minimized.

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Kaftanov, S. V. et al., Measuring the Temp. of Granulated Carbon in a High-Freq. Field,In Ind. Lab. (USA), vol. 38, No. 11, (Nov. 1972), pp. 1723-1724.
The A.R.R.L. Antenna Book, c. 1960, The American Radio Relay League Inc. Chapter 3, pp. 106-108.

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