超音波を用いた低速移動測定による路面材料の推定

抄録

The purpose of this study is to estimate the surface condition of road material, such as dry, wet, ice and snow, by using the ultrasonic system on the moving vehicle. As a first step, the asphalt, concrete and brick block were used as the specimen for examination and verification of the possibility of estimation by the ultrasonic with moving. The ultrasonic wave (the central frequency of 40 kHz) which propagated to the specimen in the air reflects at the material surface by the difference of an acoustic impedance and surface condition, and it is received the ultrasonic transducer. The ultrasonic system was set on the hand cart and moved 10m at the low velocity (walking speed) for measurement. Brick block specimen has bigger value for the mean of maximum amplitude, and also the dispersion of the measurement result is wider than other road material.