Development of Sound Pressure Field Evaluation system for NDE Ultrasonic Transducer Using Photoelastic CT Method

光弹CT法无损检测超声换能器声压场评估系统的研制

• 批准号: 06555208
• 负责人: DATE Kazuhiro
• 金额: $ 8万
• 依托单位: TOHOKU UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1995
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06555208/
• 关键词: CT Method; Photo Elasticity; 3 Dimensional Sound Field; NDE; Ultrasonic Inspection; Ultrasonic Transducer; Normal Probe

Since ultrasonic inspection depend strongly on ultrasonic transducer, detail of the sound pressure field of each ultrasonic transducer used must be investigated. Most suitable measurement system was ultrasonic visualization system using photo elasticity. However, these method can only measure two dimensional sound pressure field which is not enough for standard transducer evaluation system.In this research, photoelastic computer tomography (CT) method was developed for three dimensional measurement of sound pressure distribution of a longitudinal wave.In a near field of the sound pressure distribution produced by the normal prove, an interference pattern which shows the three dimensional sound pressure distribution was observed. The effects of frequency and propergation distance on the three dimensional sound pressure distribution were observed and compared with wave theory.Near field of the sound pressure distribution of line focus beam transducer were also observed using this system.

由于超声检测对超声换能器的依赖性很强，因此必须研究每个超声换能器所使用的声压场的细节。最适合的测量系统是采用光弹性的超声可视化系统。然而，这些方法只能测量二维声压场，这对于标准换能器评价系统来说是不够的。本研究开发了光弹性计算机层析成像(CT)方法来测量纵波的三维声压分布，在由正态分布产生的声压分布的近场中，观察到显示三维声压分布的干涉图样。利用该系统观测了频率和传播距离对三维声压分布的影响，并与波动理论进行了比较，并对线聚焦声束换能器声压分布的近场进行了观测。

项目成果

K.Date: "Observation of 3 Dimensional Sound Pressure Field Using Photoelastic CT Method" J.of JSNDI. 43-9. 576-581 (1994)

K.Date：“利用光弹性CT方法观察3维声压场”J.of JSNDI。

伊達,和博: "光弾性CT法による三次元音場の観察" 非破壊検査. 43. 576-581 (1994)

Date，Kazuhiro：“利用光弹性CT方法观察三维声场”无损检测43。576-581。