Study of the Changes in Optical Parameters of Diseased Apple Pulps Based on the Integrating Sphere Technique.

Lesions in the internal tissues of apples lead to changes in their chemical composition and physical properties, which in turn lead to changes in optical parameters. The integrating sphere method can be used to detect optical parameters by means of slice detection. Healthy apple pulps, pulps with mild lesions, and pulps with severe lesions can be cut from the same diseased apple and then measured simultaneously. The results are as follows. In diseased fruits of three pathogens, the absorption coefficient gradually increases with the appearance and aggravation of the lesion. The reduced scattering coefficient gradually decreases, and the change in the absorption coefficient changes significantly. The degree of change in the optical parameters varies, but the above trends are still obvious. This work provides a theoretical basis for the nondestructive testing of internal lesions in apples using optical parameters of their tissues in later stages. [ABSTRACT FROM AUTHOR]