Markham_2020_Polarisation.pdf (2.54 MB)
Polarisation changes in guided infrared thermography using silver halide poly-crystalline mid-infrared fibre bundle
journal contribution
posted on 2022-12-13, 09:44 authored by Sarah K. Markham, Aladin Mani, Elena A. Korsakova, Aleksandr S. Korsakov, Liya V. Zhukova, Joanna Bauer, Christophe Silien, SYED ANSAR TOFAILSYED ANSAR TOFAILBroadband mid-infrared (B-MIR) thermography using fibre optic waveguides can be critical in real-time imaging in harsh environments such as additive manufacturing, personalised medical diagnosis and therapy. We investigate the polarisation effect on thermal measurements through poly-crystalline fibre bundle employing a simple broadband cross-polarisation configuration experimental set-up. Silver halide poly-crystalline fibres AgCl1-xBrx (0 = x=1) (AgClBr-PolyC) have very wide transmission bandwidth spanning over the spectral range from 1 µm up to 31 µm FWHM. Moreover, they are non-toxic, nonhygroscopic, with relatively good flexibility, which make them very adequate for spectroscopic and thermal measurements in medical and clinical fields. In this study, we used a fibre bundle composed of seven single AgClBr-PolyC fibres, each with a core diameter of about 300 µm, inserted between two broadband MIR polarisers.A silicon carbide filament source was placed at the entrance of the fibre bundle, while a FLIR thermal camera with a close-up lens was employed to measure the spatial temperature distribution over the fibre-bundle end. Indeed, polarisation dependence of temperature measurements has been clearly observed in which the orientation of temperature extrema (minima and maxima)vary from one fibre to another within the bundle. Moreover, these observations have enabled the classification of AgClBr-PolyC
fibres following their polarisation sensitivities by which some fibres are relatively highly
sensitive to polarisation with polarisation temperature difference (PTD) that can reach
22.1 ± 2.8 °C, whereas some others show very low PTD values down to 3.1 ± 2.8 °C. Many applications can readily be found based on the advantages of both extreme cases.
Funding
Bud mutation of the molecular mechanism of Citrus
National Natural Science Foundation of China
Find out more...History
Publication
Journal of Thermal Analysis and Calorimetry;Publisher
Springer VerlagNote
peer-reviewedOther Funding information
SFI, RSFLanguage
EnglishAlso affiliated with
- Bernal Institute
External identifier
Department or School
- Physics