Recently a large number of tests and experiments have been done to evaluate the effects of their impact on agricultural products using high techniques like, vibration (acoustic, ultrasonic and sonic response).Some modification methods have been applied to impact probe and signal conditioning to improve the firmness prediction performance and reduce the potential for bruising. The inspection of quality and maturity are important to resist impact damage and bruises of agricultural products. The Magness Talor Firmness is a destructive device and used in post harvest while for non-destructive tests we used (optical , magnetic response and ultrasonic) techniques> There are several technological areas for measuring agricultural products and their properties of quality such as, Image processing:; Visible and Infrared Light Energies, Nuclear Magnetic Resonance and Mechanical Simulation. The free fall device is used to separate different maturity levels of papaya. The Nuclear Magnetic Resonance is device used to perform constituent analyses of agricultural products. The acceleration of mass during impact indicates the firmness of fruits, the large acceleration indicates a harder fruits and the small acceleration indicates a softer fruits. To measure firmness of spherical fruits the impulse response method is used. In this method impacting hammer to fruits and exciting the response signal is captured using a microphone and viberation response is analyzed which is related to the firmness. The method of impact force response is used for firmness detection measurement based on sonic and ultrasonic method for Non-destructive measurements of internal quality of agricultural products. To determine some basic acoustic properties a low frequency (50kHZz) ultrasonic excitation is used. Non-destructive techniques for measuring textural quality of apples and watermelons are based on the acoustic response of the fruits. Computer software has been developed to determine the first resonant frequency.
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