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Multiplexed lock-in thermography

Title data

Kopera, Bernd A. F. ; Retsch, Markus:
Multiplexed lock-in thermography.
In: Review of Scientific Instruments. (25 January 2021) . - No. 014902.
ISSN 1089-7623
DOI: https://doi.org/10.1063/5.0029001

Abstract in another language

Many modern measurement methods for heat transfer work in the frequency domain. A certain average temperature rise in the sample is unavoidable if the sample can only be heated, e.g., by an intensity modulated light source. This average temperature rise influences the measured thermal properties because they are, in general, temperature dependent. Here, we explore square waves and multiplexed sine waves with the goal of reducing the average temperature rise. We apply these signals to lock-in thermography and show the feasibility of a simultaneous measurement at multiple frequencies. In addition, we propose the use of the Goertzel algorithm to efficiently extract individual spectral components from the temperature signal.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Wave forms; Data processing; Materials properties; Dielectric materials; Heat transfer mechanism; Signal generators; Thermography; Infrared imaging
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Physical Chemistry I > Chair Physical Chemistry I - Univ.-Prof. Dr. Markus Retsch
Profile Fields > Advanced Fields > Polymer and Colloid Science
Profile Fields > Emerging Fields > Energy Research and Energy Technology
Research Institutions > Research Centres > Bayreuth Institute of Macromolecular Research - BIMF
Research Institutions > Research Centres > Bayreuth Center for Colloids and Interfaces - BZKG
Research Institutions > Affiliated Institutes > Bavarian Polymer Institute (BPI)
Result of work at the UBT: Yes
DDC Subjects: 500 Science
500 Science > 540 Chemistry
Date Deposited: 28 Jan 2021 08:09
Last Modified: 28 Jan 2021 08:09
URI: https://eref.uni-bayreuth.de/id/eprint/62536