Thermal properties measurement using a superconductor sensor

Details Thermal properties measurement using a superconductor sensor Thermal properties measurement using a superconductor sensor

1992-05-29

1993-10-05

Cuchlinski, Jr., William A.

Thermal measuring and testing

Temperature measurement

By electrical or magnetic heat sensor

374173, 374163, 364557, 505700, G01K 714

Patent

active

052498662

ABSTRACT:
A method for thermal environment sensing utilizing superconducting materi finds utility in the production of low power cryogenic flow meters, bolometers, level detectors and other types of thermal environment sensors. A device for determining the first and second derivatives (dV/dI and d.sup.2 V/dI.sup.2) utilizes a ramped current until a set value of the first derivative (dV/dI) is achieved, the current supply being placed in a feedback mode to maintain the first derivative constant and monitoring any changes in the second derivative (d.sup.2 V/dI.sup.2) which indicate changes in the thermal environment. Alternatively, the second derivative is maintained constant and the first derivative is measured. Any parameter which is indicative of the non-linearity of the relationship between the voltage and the current can be utilized instead of the second derivative.

REFERENCES:
patent: 3211002 (1965-10-01), Franklin
patent: 4602871 (1986-07-01), Hanaoka
patent: 4760538 (1988-07-01), Bock et al.
patent: 5137370 (1992-08-01), McCulloch

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