Thermal measuring and testing – Heat flux measurement
Patent
1992-05-12
1993-03-16
Cuchlinski, Jr., William A.
Thermal measuring and testing
Heat flux measurement
374176, G01K 1700
Patent
active
051939096
ABSTRACT:
The present invention is a quantitative method for measuring the total heat flux, and of deriving the total power dissipation, of a heat-fluxing object which includes the steps of placing an electrical noise-emitting heat-fluxing object in a liquid helium bath and measuring the superfluid transition temperature of the bath. The temperature of the liquid helium bath is thereafter reduced until some measurable parameter, such as the electrical noise, exhibited by the heat-fluxing object or a temperature-dependent resistive thin film in intimate contact with the heat-fluxing object, becomes greatly reduced. The temperature of the liquid helum bath is measured at this point. The difference between the superfluid transition temperature of the liquid helium bath surrounding the heat-fluxing object, and the temperature of the liquid helium bath when the electrical noise emitted by the heat-fluxing object becomes greatly reduced, is determined. The total heat flux from the heat-fluxing object is determined as a function of this difference between these temperatures. In certain applications, the technique can be used to optimize thermal design parameters of cryogenic electronics, for example, Josephson junction and infra-red sensing devices.
REFERENCES:
patent: 3575053 (1971-04-01), Telinde
patent: 3646813 (1972-03-01), Kuzniete et al.
patent: 3665761 (1972-05-01), Gregory
patent: 3745460 (1973-07-01), Belzer et al.
patent: 3906231 (1975-09-01), Fletcher et al.
patent: 4123938 (1978-11-01), Hamilton
patent: 4302943 (1981-12-01), Niemann et al.
patent: 4464065 (1984-08-01), Wolf et al.
patent: 4840495 (1989-06-01), Bonnefoy
R. Duncan, "Thermal Effects on the Josephson Series-Array Voltage Standard", Physica B, vol. 165, pp. 101-102, 1990.
J. Adler et al., "Instabilities in Superconducting Tunnel Junctions in Different Thermal Environments", Appl. Phys. Lett., 42(10), May 15, 1983, pp. 904-905.
G. Ahlers et al., "Recent Experiments Near the Superfluid Transition in .sup.4 He", Frontiers of Physics, Jun. 1988, pp. 219-238.
W. Dietsche, "Imaging of the Phonon Emission in the Quantum-Hall Effect", XIX International Conference on Low Temperature Physics Conference Handbook, Aug. 1990, p. 249.
R. Fagaly, "SQUID Instrumentation and Applications", Superconductor Industry, Winter 1989, pp. 24-30.
Bennett G. Bradley
Chafin James H.
Cuchlinski Jr. William A.
Moser William R.
Ojanen Karla
LandOfFree
Quantitative method for measuring heat flux emitted from a cryog does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Quantitative method for measuring heat flux emitted from a cryog, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Quantitative method for measuring heat flux emitted from a cryog will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-348391