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Reducing Systematic Errors in Thermal Diffusivity Laser Flash Measurements Caused by Detector Inherent Delayed Response

Breuer, Simon; Schilling, Frank R.

Abstract (englisch):
Laser flash apparatuses (LFA) are a widely used method to determine thermal diffusivity. Different factors influencing the quality of the diffusivity determination have been identified. Especially for thin samples, detector related time delays between the triggering of a laser pulse and signal detection as well as the shape of the laser pulse may become crucial for precise measurements. It is well known how to detect and account for laser pulse shape with respect to the trigger signal (“finite pulse-time effect”). An additional delayed response of the signal can be caused by detectors and electronic components (e.g. electronic filters) and inherent to LFA measurements. To correct for this additional delay, the detector signal of direct laser pulses was measured and a transfer function derived. This allows to account for the laser-pulse-detector behavior, based on the measured characteristic of the laser for different detectors (indium antimonide (InSb) and MCT (HgCdTe) detectors). The effect of the detector response is detector specific. For the experimental setup used, systematic errors caused by this effect are in the same range than the often considered finite pulse-time effect. ... mehr

Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Vortrag
Publikationsdatum 18.06.2019
Sprache Englisch
Identifikator KITopen-ID: 1000096085
HGF-Programm 35.14.01 (POF III, LK 01) Effiziente Nutzung geothermisch. Energie
Veranstaltung 34th International Thermal Conductivity Conference (ITCC 2019), Wilmington, DE, USA, 17.06.2019 – 20.06.2019
Schlagwörter Laser Flash Method, Thermal Diffusivity, Finite Pulse-Time Effect, Uncertainty
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