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Characterizing pear tissue with optical absorption and scattering properties using spatially-resolved diffuse reflectance

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Abstract

Spatially-resolved diffuse reflectance (SRDR) technique, with simple instrumentation, fast measurement, and relatively cheap devices, offers great potential for measurement of optical absorption (µa) and scattering (µs′) properties of agro-products. In this study, a laboratory-based double-fiber-optical-probe system was established and developed for optical property measurement of pear samples in the spectral region of 500–1000 nm. The system, based on a simple two-source diffusion theory model, was able to acquire SRDR profiles, which were used to calculate the µa and µs′ via nonlinear fitting. 32 pear samples with three different measured surfaces were tested in this study. The SRDR profiles of 41 positions were acquired, from −1 to 1 cm at an interval of 0.05 cm. The values of µa ranged nearly from 0.10 to 0.61 cm−1 and peaked at 970 nm due to water absorption, while the µs′ decreased along wavelengths with its values from 12.5 to 9.5 cm−1. The results indicated that the optical properties of pear tissues were wavelength-dependent, and small discrepancies of µa and µs′ could be found for different measured surfaces. The creation of standard sample slicing procedure is in great demand, which is useful for improving the accuracy of optical property measurement.

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Acknowledgements

The authors gratefully thank Chang Zhang for her help with experiment, proofreading this paper as well as for her constructive suggestions. And we are grateful for the financial support provided by the National Natural Science Fund of China (31401289).

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Correspondence to Yibin Ying.

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Hu, D., Fu, X. & Ying, Y. Characterizing pear tissue with optical absorption and scattering properties using spatially-resolved diffuse reflectance. Food Measure 11, 930–936 (2017). https://doi.org/10.1007/s11694-017-9465-x

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  • DOI: https://doi.org/10.1007/s11694-017-9465-x

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