Quantitative method for measuring heat flux emitted from a cryogenic object
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 infrared sensing devices.
- DOE Contract Number:
- AC04-76DP00789
- Assignee:
- Dept. of Energy, Washington, DC (United States)
- Patent Number(s):
- US 5193909; A
- Application Number:
- PPN: US 7-881980
- OSTI ID:
- 6278578
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CONTROL
COOLING SYSTEMS
CRYOGENICS
DESIGN
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY LOSSES
ENERGY SYSTEMS
FLUIDS
GASES
HEAT FLUX
HELIUM
INFRARED RADIATION
JOSEPHSON JUNCTIONS
JUNCTIONS
LOSSES
MEASURING INSTRUMENTS
MEASURING METHODS
NOISE
NONMETALS
OPTIMIZATION
PHYSICAL PROPERTIES
POWER LOSSES
RADIATION DETECTORS
RADIATIONS
RARE GASES
SUPERCONDUCTING JUNCTIONS
SUPERFLUIDITY
TEMPERATURE CONTROL
TEMPERATURE DEPENDENCE
TEMPERATURE MEASUREMENT
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE