テーパロッドを伝搬する超音波パルスのSN比の向上に関する検討

抄録

Ultrasonic pulse-echo methods with a buffer rod are expected to be effective means for high temperature measurements of materials and online monitoring in materials processing where the use of conventional ultrasonic sensors are restricted. For practical application of such buffer rod method, it has often been required to employ a thin and long buffer rod because such thinner rods could be useful for measurements with high spatial resolution at a narrow region. In this work, a tapered buffer rod with a small probing tip has been designed. The influences of the tip diameter, taper angle and frequency of tapered polymer buffer rods on its signal-to-noise ratio (SNR) are systematically examined by a finite element method. An appropriate geometrical shape of a tapered buffer rod with higher SNR is then determined.