Extrinsic optical-fiber ultrasound sensor using a thin polymer film as a low-finesse Fabry-Perot interferometer

被引：143

作者：

Beard, PC

Mills, TN

机构：

[1] Department of Medical Physics and Bioengineering, University College London, London, WC1E 6JA, Shropshire House

来源：

APPLIED OPTICS | 1996年 / 35卷 / 04期

关键词：

optical fiber; ultrasound; Fabry-Perot; polymer film;

D O I：

10.1364/AO.35.000663

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Theoretical and experimental aspects of an extrinsic optical-fiber ultrasound sensor are described. The sensor is based on a thin transparent polymer film acting as a low-finesse Fabry-Perot cavity that is mounted at the end of a multimode optical fiber. Performance was found to be comparable with that of a piezoelectric polyvinylidene difluoride-membrane (PVDF) hydrophone with a sensitivity of 61 mV/MPa, an acoustic noise floor of 2.3 KPa over a 25-MHz bandwidth, and a frequency response to 25 MHz. The wideband-sensitive response and design flexibility of the concept suggests that it may find application as an alternative to piezoelectric devices for the detection and measurement of ultrasound. (C) 1996 Optical Society of America

引用

页码：663 / 675

页数：13