12 May 2015 Superimpose methods for uncooled infrared camera applied to the micro-scale thermal characterization of composite materials
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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.
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Junko Morikawa, Junko Morikawa, } "Superimpose methods for uncooled infrared camera applied to the micro-scale thermal characterization of composite materials", Proc. SPIE 9485, Thermosense: Thermal Infrared Applications XXXVII, 94850Z (12 May 2015); doi: 10.1117/12.2180475; https://doi.org/10.1117/12.2180475


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