Measuring and testing – Gas analysis – Moisture content or vapor pressure
Patent
1975-09-23
1976-08-17
Queisser, Richard C.
Measuring and testing
Gas analysis
Moisture content or vapor pressure
73362AR, 99342, 99421TP, 219 1055E, 333 73C, G01K 108, G01K 724, G08B 2100
Patent
active
039746968
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 having first and second ends and generally extending between the probe and the cooking cavity wall connects the probe to circuitry responsive to thermally-induced changes in a characteristic of the electrical element, and includes chokes at either or both ends of the cable, the chokes presenting a high impedance to microwave energy of wavelength .lambda. . The cable length is selected to be approximately equal to n .lambda./2, where n is any integer, when one choke is used, and approximately equal to n .lambda./4, where n is any odd integer, when two chokes are used. 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 Temperature of Granulated Carbon in a High-Frequency Field, In Ind. Lab. (USA), vol. 38, No. 11, (Nov. 1972), pp. 1723-1724.
The ARRL Antenna Book, C. 1960, The American Radio Relay League, Inc., Chapter 3, pp. 106-108.
Boos Francis H.
Caslin Richard L.
General Electric Company
Queisser Richard C.
Schnedler Steven C.
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