Electrical resistors – Resistance value responsive to a condition – Ambient temperature
Patent
1977-10-14
1979-04-03
Albritton, C. L.
Electrical resistors
Resistance value responsive to a condition
Ambient temperature
128 2H, H01C 704
Patent
active
041480058
ABSTRACT:
A thermometric transducer device is provided for use in measuring the temperature of a dielectric, such as human tissue, during exposure of the dielectric to microwave radiation. The system includes a transducer electrode sub-assembly which is partially inserted into the dielectric and comprises a thermistor mounted on one end of an elongate substrate and thick film conductors which extend along the length of the substrate and which are tapered so as to provide electrothermal matching of the heat produced in an equivalent volume of the dielectric so that the transducer electrode serves neither as a heat source or a heat sink. The transducer sub-assembly is connected to measurement instrumentation by a transmission line formed by ultra-thin thin film conductors whose thickness relative to the skin depth of the microwave field in the conductors is such that the conductors are a poor medium for microwave conduction and are thus microwave decoupled.
REFERENCES:
patent: 3893058 (1975-07-01), Keith
L. Larsen, et al., A Microwave Decoupled Brain-Temperature Transducer, "I Transactions on Microwave Theory and Techniques", vol. MTT-22, No. 4, pp. 438-444, Apr. 1974.
Robinson, et al., Microwave Heating of Malignant Mouse Tumors and Tissue Equivalent Phantom Systems, "Journal of Microwave Power", vol. 11, No. 2, pp. 87-98, Jun. 1976.
G. R. Davis, Microwaves Score TKO in Fight Against Cancer, "Microwaves", vol. 15, No. 10, pp. 14, 16, Oct., 1976.
R. P. Clark, et al., An Application of Aeronautical Techniques to Physiology: 1 The Human . . . Convective Heat Transfer, "Medical and Biological Engineering", vol. 12, No. 3, pp. 270-274, May 1974.
Jacobi John H.
Larsen Lawrence E.
Albritton C. L.
Bellamy Werten F. W.
Gapcynski William G.
The United States of America as represented by the Secretary of
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