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Abstract

Frequency-domain laser infrared photothermal radiometry (PTR) and photoacoustic Fourier transform spectroscopy (FT-IR/PAS) were used for the measurement of the thermophysical properties (thermal diffusivity, α, and conductivity, k) of specialty paper samples with various cotton contents. An improved one-dimensional photothermal model of a free-standing sheet of paper in air that includes both the transmission and backscattering mode was introduced. A high degree of accuracy and reliability was obtained when a multiparameter-fit optimization algorithm was used to examine the transmission and backscattered PTR experimental results. The ability to measure α and its variation, Δα, as a result of the manufacturing process via the PTR technique is invaluable in terms of the quality control of paper products.

Keywords

Radiometry Photothermal Thermal properties Papers Nondestructive tests Photoacoustic FT-IR

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Quantitative Photothermal Radiometric and FT-IR Photoacoustic Measurements of Specialty Papers

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