Advances in distributed sensing using Brillouin scattering

被引：21

作者：

Brown, AW ^{[1
]}

DeMerchant, MD ^{[1
]}

Bao, XY ^{[1
]}

Bremner, TW ^{[1
]}

机构：

[1] Univ New Brunswick, Dept Phys, Fredericton, NB E3B 5A3, Canada

来源：

SMART STRUCTURES AND MATERIALS 1998: SENSORY PHENOMENA AND MEASUREMENT INSTRUMENTATION FOR SMART STRUCTURES AND MATERIALS | 1998年 / 3330卷

关键词：

distributed sensing; Brillouin scattering; strain sensing;

D O I：

10.1117/12.316985

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：

Fibre optic distributed sensors based on Brillouin scattering can measure strain and temperature in arbitrary regions of a sensing fibre. The fibre optics group at the University of New Brunswick has recently developed an automated system for strain measurements in a distributed sensing system. Under a computer control program, strain measurements are taken using Brillouin Optical Time Domain Analysis. The computer takes a series of measurements of Brillouin loss in the fibre as a function of the frequency difference between the two lasers in the system. By fitting the returned data to a predetermined model, accurate determination of the Brillouin frequency and hence strain in the fibre can be made. An experiment was conducted to test the sensor system in which fibre was stretched by use of dead weights hanging on a system of pulleys. Determination of strain to within 17 mu epsilon was realized. Spatial resolutions of better than 1 m were obtained through standard BOTDA methods and resolutions of better than 500 mm were realized using our compound spectrum analysis method.

引用

页码：294 / 300

页数：7