Abstract
When using an infrared detector to measure temperature changes as in the case of the flash technique, the effects of detector nonlinearity can have drastic effects on the experimental data. In the flash technique, the detector nonlinearity tends to shift the calculated half-time to larger values, resulting in underpredicted values of thermal diffusivity especially in experiments performed at room temperature. In order to predict the error in the diffusivity calculation, the nonlinear relationship between the detector signal and the temperature change was developed into a Taylor series expansion used in the flash technique's mathematical model. The nonlinear detector model proves to yield accurate correction factors for the presently calculated values of diffusivity. In order to utilize the model, it is necessary to estimate the maximum temperature rise of the back surface and the degree of detector nonlinearity.
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Hoefler, J.J., Taylor, R.E. Effects of infrared detector nonlinearity on thermal diffusivity measurements using the flash method. Int J Thermophys 11, 1099–1110 (1990). https://doi.org/10.1007/BF00500563
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DOI: https://doi.org/10.1007/BF00500563