Design and experience of using light-emitting diodes (LEDs) as the inbuilt light source for a customised differential photomicrocalorimeter

Richard Bernard Kemp, V. S. Mukhanov

Allbwn ymchwil: Cyfraniad at gyfnodolynErthygl

9 Dyfyniadau(SciVal)
148 Wedi eu Llwytho i Lawr (Pure)

Crynodeb

In the photomicrocalorimetric module designed by Johansson and Wadsö for a commercial Thermometric TAM heat conduction batch microcalorimeter, the incident light from an external xenon lamp was divided by a beam splitter and directed to the two vessels of the differential system by light guides ideally to give zero heat flow. In practice this proved difficult and so to improve the balance between the vessels in terms of the incident light heat output as well as potentially to give more versatility regarding the choice of wavelengths, the xenon lamp-based system was replaced in the first stage by a pair of cold white LEDs embedded directly in the test and reference vessels. The LEDs had independent electrical circuits to achieve the balance by manual adjustment. As a second stage, the test vessel was equipped with PTFE tubing for changing the liquid phase in it while it was in the middle thermal equilibrium position. This improved the reproducibility of the results.
Iaith wreiddiolSaesneg
Tudalennau (o-i)731-736
Nifer y tudalennau6
CyfnodolynJournal of Thermal Analysis and Calorimetry
Cyfrol95
Rhif cyhoeddi3
Dynodwyr Gwrthrych Digidol (DOIs)
StatwsCyhoeddwyd - 12 Maw 2009
Digwyddiad15th International Conference on Biological Calorimetry, Univ Pecs - Pecs, Hwngari
Hyd: 01 Ion 200801 Ion 2008

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