反射法を用いた超音波トモグラフィによるボイド分布計測法の開発

抄録

In order to measure void distribution in opaque two-phase flows such as liquid-metal, ultrasonic tomography was developed. In the tomography, the measurement accuracy depends on the number of sensors. However, with increases the number of sensors, the temporal resolution decreases for obtaining a cross-sectional information. Therefore, lower number of sensors is suitable for two-phase flow measurement. In order to reduce the number of sensors, a reflection method was employed for the tomography. An ultrasonic sensors which can emit ultrasonic wave at wide-angle was developed. It was shown that the sensor could emit ultrasonic wave in the angle ranging of ±55°. Furthermore, the sound pressure thickness was almost constant at 4~6 mm. As a result, it was confirmed that echo method could be applied for the tomography algorithm, and it enabled to reduce the number of ultrasonic sensors for the tomography.