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Proceedings Paper

Superimpose methods for uncooled infrared camera applied to the micro-scale thermal characterization of composite materials
Author(s): Junko Morikawa
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Paper Abstract

The mobile type apparatus for a quantitative micro-scale thermography using a micro-bolometer was developed based on our original techniques such as an achromatic lens design to capture a micro-scale image in long-wave infrared, a video signal superimposing for the real time emissivity correction, and a pseudo acceleration of a timeframe. The total size of the instrument was designed as it was put in the 17 cm x 28 cm x 26 cm size carrying box.

The video signal synthesizer enabled to record a direct digital signal of monitoring temperature or positioning data. The encoded digital signal data embedded in each image was decoded to read out. The protocol to encode/decode the measured data was originally defined. The mixed signals of IR camera and the imposed data were applied to the pixel by pixel emissivity corrections and the pseudo-acceleration of the periodical thermal phenomena. Because the emissivity of industrial materials and biological tissues were usually inhomogeneous, it has the different temperature dependence on each pixel. The time-scale resolution for the periodic thermal event was improved with the algorithm for “pseudoacceleration”. It contributes to reduce the noise by integrating the multiple image data, keeping a time resolution.

The anisotropic thermal properties of some composite materials such as thermal insulating materials of cellular plastics and the biometric composite materials were analyzed using these techniques.

Paper Details

Date Published: 12 May 2015
PDF: 6 pages
Proc. SPIE 9485, Thermosense: Thermal Infrared Applications XXXVII, 94850Z (12 May 2015); doi: 10.1117/12.2180475
Show Author Affiliations
Junko Morikawa, Tokyo Institute of Technology (Japan)

Published in SPIE Proceedings Vol. 9485:
Thermosense: Thermal Infrared Applications XXXVII
Sheng-Jen (Tony) Hsieh; Joseph N. Zalameda, Editor(s)

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