Dr. Xueming He Profile

Dr. Xueming He

at Zhejiang Univ

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Proceedings Article | 17 May 2016 Paper

Relationship between shelf-life and optical properties of Yuanhuang pear in the region of 400-1150 nm

Xueming He, Xiaping Fu, Xiuqin Rao, Zhenhuan Fang

Proceedings Volume 9864, 986407 (2016) https://doi.org/10.1117/12.2223307

KEYWORDS: Optical properties, Integrating spheres, Tissues, System integration, Reflectivity, Transmittance, Calibration, Solids, Liquids, Absorption

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The main goals of this study are to investigate the potential of absorption coefficient for the prediction of water contents in ‘Yuanhuang’ pear and analyze the relationship between the shelf-life and bulk optical properties in the range of 900-1050 nm. An automated integrating sphere (AIS) system was used to measure the total reflectance, total transmittance of pear flesh tissues in visible-Near infrared (Vis-NIR) range. These two measurements were used to estimate the absorption coefficient μ_a and reduced scattering coefficient μ'_s of pear samples by using an inverse adding doubling (IAD) light propagation model. The detection accuracy of the AIS system was verified by using both liquid (Intralipid-20% as scatterer) and solid phantom (TiO₂ as scatterer, carbon black as absorber). The relative error of measurement of μ'_s of liquid phantom with four different concentration (0.5%,1%,1.5%,2%) at 632.8 nm, 751 nm, 833 nm are less than 10% except for 2% concentration at 833 nm, and the relative error of measurement μ_a and μ'_s of solid phantom at 525.4 nm, 632.1 nm, 710.3 nm and 780.1 nm are less than 5% except for the μ_a at 525.4 nm. A total of 140 samples were used to conduct the moisture measurement, and drying method was used. Predictive models for moisture content from μ_a data were constructed using partial least squares regression (PLSR). The coefficient of correlation of calibration set (R_c) and validation set (R_p) were 0.50 and 0.45 respectively. The relationship between the shelf-life and optical properties was analyzed by dividing pear samples into three categories according to the actual shelf-life, and calculating classification accuracy by using actual and calculated shelf-life grade.

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