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A reassessment of the basic equation governing calorimetry shows the crucial importance of temperature stability in the calorimeter environment. Following the principles derived, a new temperature control method has been developed and demonstrated in a prototype calorimeter over a wide dynamic range (5 microW to 2W). Temperature control is achieved by using a metal block of high thermal inertia, surrounded by heat flow sensing thermopile arrays, embedded in an isothermal environment. Any temperature fluctuations are detected by the heat flow sensors and corrected by conventional feedback control. The advantage of this method is its high sensitivity to temperature changes: a correctly selected combination of inertial mass and thermopile arrays can provide signals of the order of 1 V/K, thus permitting an improvement of temperature control by three orders of magnitude.

Additional information

Authors: HEMMERICH J L, JET Joint Undertaking, Abingdon, Oxon. (GB);SERIO L, JET Joint Undertaking, Abingdon, Oxon. (GB);MILVERTON P, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: JET-P(93)38 EN (1993) 9 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199410334 / Last updated on: 1994-11-28
Original language: en
Available languages: en
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