A Calculating Method for the Thermo Electric Motive Force of Inhomogeneous Thermocouple

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  • 不均質熱電対の熱起電力の算出法
  • フキンシツ ネツデンツイ ノ ネツ キデンリョク ノ サンシュツホウ

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Abstract

It is difficult to know how is the error of temperature measurement in work shop. Especially, it is very trouble-some to estimate the effect of lack of the uniformity of thermocouple elements on the electric motive force (e.m.f). Because, in most case, the temperature distribution of test furnace for correction of e.m.f. of a thermocouple can not be coincided with the temperature distribution produced along thermocouple elements during its using in work shop.<BR>It is considered that the inhomogenious thermocouple elements is one of the combined elements which is constructed with many uniform elements of minute length. Now, let ΔT is the temperature difference between both ends of the ith minute element, EAi and EBi are parasitic e.m.f. produced in the ith minute element measured at Ti, Ti is the temperature in ith minute element in practical condition, Fi is the temperature coefficient of B-A thermocouple and fAi and fBi are the temperature coefficient of parasitic e.m.f. at Ti, the error ΔT which should be produced in practical condition will be calculated approximately by next formula;<BR>(This article is not displayable. Please see full text pdf.) <BR>In this report, the derivation, the practical meaning and the accuracy of this formula and some experimental evidence are discribed.

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