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The target of our research is to develop a technology for objectively measuring the density in a silo. In the present paper, we attempted to detect ultrasonic waveforms through shredded raw forage crops in order to obtain foundational data on measuring forage crops densities by nondestructive means.

A function generator, oscilloscope, transmitting ultrasonic transducer, and receiving ultrasonic transducer were used in these experiments. Forage samples that had been formed to cylindrical cells, were made from shredded alfalfa and whole-crop rice.

A well-spread ultrasonic wave could be emitted by ultrasonic transducer when rectangle or pulse waves were generated from the function generator. A 16V amplitude rectangle ultrasonic wave could pass through 75mm thick cylindrical forage samples of 650kg/m3 or greater density.