Abstract
ABSTRACT THE impact forces of fruit striking a rigid surface were considered as a means for nondestructive determination of firmness. Impact forces were simulated with a simple elasticity model. Shape characteristics were evaluated as firmness predictors for variations in elasticity, mass, radius of curvature, and contact speed. The time characteristic (peak force)/(time to peak force squared) was sensitive to elasticity and relatively insensitive to fruit size. Frequency characteristics in the range 250 to 340 Hz exhibited a threshold relationship with elasticity and moderate sensitivity to size. All characteristics were sensitive to the speed at contact. Performance of several filter circuits to sense the designated frequency components was simulated. A Chebyshev filter gave better response than a biquad filter.
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