Complex analysis of disturbing factors influence upon the measurement of thermal parameters by means of a pulse method

Abstract

This paper discusses the influence of disturbing factors on the measurement of thermal parameters by means of a pulse method. Contrary to previous works where the individual disturbing factors (e.g., heat losses from the surface of a sample, contact thermal resistance and intrinsic thermal capacity of a supply) are examined separately, in this study the simultaneous influence of such factors is mathematically analysed. It is shown that generally the effect of the mentioned factors does not possess an additive character, therefore their separate investigation has little practical importance. Under certain circumstances the errors caused by these factors can be mutually compensated. This paper contains diagrams which allow (in some cases) the calculation of a correct value of measured parameter if the magnitude of disturbing factors is known. General value of these diagrams is, however, in supplying criterions under which the disturbing factors should be considered.