Communications: electrical – Systems – Call station
Patent
1975-09-23
1976-08-17
Queisser, Richard C.
Communications: electrical
Systems
Call station
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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Chen David Y.
Fitzmayer Louis H.
Boos Francis H.
Caslin Richard L.
General Electric Company
Queisser Richard C.
Schnedler Steven C.
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