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Fruit firmness estimates usually require contacting or destructive methods. However, we propose to estimate firmness from an all optical, non-contacting method that generates and detects elastic waves in an apple. The compressional and shear wave velocities are governed by the fruit's elastic constants and density, which can be used to estimate firmness, non-destructively. High energy pulses of light are used to excite elastic waves via thermo-elastic expansion. Elastic waves are detected usingdoi:10.5281/zenodo.893707 fatcat:a2esam4lvrcdbgh7kdok4m2ogi