Development of Acoustic Probe for Extreme Severe Environment

在本研究中，我们开发了用于极端恶劣环境的声探测器，以探测和测量声信号。该探头适用于两种极端恶劣的环境。一种是高温周向，另一种是声空化浸没在超高纯水中。使用了三种不同的声学探头。声学探头的第一种结构是石英熔管激光多普勒测振仪。在玻璃管内，用LDV测量振动位移。第二个探头是LDV，其中声压是通过光程差测量的。第三种配置是测量光纤末端反射强度的光纤。测量了点淋式超声波清洗机和波导式超声波清洗机的声压，为超高纯水提供声空化。可以检测到三次谐波成分。然而，尚未实现对绝对值的校准。

In this research, we develop acoustic probes for extreme severe environment in order to detect and to measure acoustic signal. The probe is applied to two extreme severe environments. One is high temperature circumferential and the other is immersion to ultra high pure water with acoustic cavitation. Three different acoustic probes are applied. First configuration of acoustic probe is a fused quartz tube with laser Doppler vibrometer(LDV). In the glass tube, the vibration displacement is measured by LDV. The second probe is a LDV in which acoustic pressure is measured by the optical path difference. The third configuration is a optical fiber in which reflection intensity at the fiber end is measured. Acoustic pressure of a spot shower type ultrasonic cleaning machine or a waveguide type is measured, which provides the ultra high pure water with acoustic cavitation. Third harmonic component can be detected. However, the calibration to the absolute value has not been achieved.