Accession Number : AD0641122

Title :   TRANSIENT THERMOMETRY WITH INERT THERMOMETERS,

Corporate Author : BOEING SCIENTIFIC RESEARCH LABS SEATTLE WASH

Personal Author(s) : Erdmann,J. C. ; Jahoda,J. A.

Report Date : MAY 1966

Pagination or Media Count : 74

Abstract : A thermometer in contact with a test specimen is inert, if its heat capacity is not small compared with the heat capacity of the test specimen. The response of the thermometer to a transient temperature of the specimen can then be described by a transfer function. Solutions are obtained for the single thermometer and the differential thermometer in contact with a slab whose ends are at zero temperature. Significant simplifications arise, if the inertia of the thermometer is large. The result is applied to (a) the determination of the position and strength of instantaneous heat sources from the observation of thermal transients, (b) the determination of the heat rate function from the observed temperature transient in the uniformly heated slab. Experiments with localized instantaneous heat sources are described. The sources were activated by plastic deformation at helium temperatures. The temperature transfer functions are determined and the position and strength of the heat sources found. (Author)

Descriptors :   (*THERMOMETERS, MEASUREMENT), (*HEAT EXCHANGERS, THERMAL CONDUCTIVITY), THERMAL DIFFUSION, MATHEMATICAL ANALYSIS

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE