TECHNIQUES FOR FABRICATING FAST RESPONSE HEAT TRANSFER GAGES.
BALLISTIC RESEARCH LABS ABERDEEN PROVING GROUND MD
Pagination or Media Count:
It is necessary to use high response instrumentation in hypervelocity test facilities. High response gages presently being used to measure heat flux are the thin-film and thick-film types. Special techniques have been developed for fabricating both types for use in research programs in the Ballistic Research Laboratories BRL expansion tube. The thin-film gage has a cured metallic film bonded to an insulator substrate. Optimum firing conditions for curing and bonding have been determined. The data reduction equations necessary to interpret the results of the gage have been developed from a mathematical model. A more recent approach for measuring heat flux is the use of a thick-film gage. The fabrication of this type of gage involves the use of platinum strips or a combination of platinum strips and thin-films. The governing equation used in the design of this gage and the interpretation of results is simply the expression for heat storage in a material. Evaporative coating can be used to electrically insulate the heat flux gages there is a brief discussion of optimum coating conditions, coating materials, and rate of deposition. Author
- Test Facilities, Equipment and Methods