Abstract
The measurement of transmitting and receiving ultrasonic vibration was performed for the purpose of non-destructive evaluation of water potential. The AE sensor and laminated piezoelectric actuator were installed on the stem of mini tomato's true leaf and the propagation characteristics of the ultrasonic vibration were measured. The water potential, furthermore, was measured by the pressure chamber method. Then, the correlation between ultrasonic characteristics and water potential was investigated. The center frequency of the FFT spectrum of the detected waveforms, fw was decreased with the decrease of water potential. Such a degradation of fw might be caused by the increase of the attenuation of the ultrasonic vibration in the range of high frequency when the stem was wilted due to falling water potential.
