DIFFERENTIAL FIBEROPTIC SENSING OF LASER-GENERATED ULTRASOUND

被引：7

作者：

WILLIAMS, BA

DEWHURST, RJ

机构：

[1] Department of Instrumentation and Analytical Science, UMIST, Manchester M60 1QD

来源：

ELECTRONICS LETTERS | 1995年 / 31卷 / 05期

关键词：

FIBER OPTIC SENSORS; ULTRASONIC TRANSDUCERS; LASER BEAM APPLICATIONS;

D O I：

10.1049/el:19950235

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

A differential fibre-optic device has been developed for noncontact detection of laser-generated ultrasound. Using a 5mW He-Ne laser as the source, laser beam delivery on to the sample of the surface utilised a singlemode fibre and lens combination. When photoacoustic ultrasonic transients propagated across the surface, the incident spot was perturbed, with backscattered light monitored by a fibre-optic bundle incorporating differential photodetection. Symmetric and asymmetric Lamb wave modes have been observed in a 50 mu m aluminium sheet, as have longitudinal and Rayleigh waves in a 30mm-thick sample.

引用

页码：391 / 392

页数：2

共 5 条

[1] CHARACTERIZATION OF SURFACE-BREAKING DEFECTS IN METALS WITH THE USE OF LASER-GENERATED ULTRASOUND [J].