5, 000 points/s high-speed random accessibility for dynamic strain measurement at arbitrary multiple points along a fiber by Brillouin optical correlation domain analysis. (25th March 2015)

• Record Type: Journal Article
• Authors: Zhang, Chunyu; Kishi, Masato; Hotate, Kazuo
• Is Part Of: Applied physics express. Volume 8:Number 4(2015:Apr.)
• Publication Date: 2015-03-25
• Subjects: Physics -- Periodicals; Technology -- Periodicals; 621.05
• DOI: 10.7567/APEX.8.042501
• Languages: English
• ISSNs: 1882-0778

Abstract

Abstract: We demonstrate dynamic strain measurement at arbitrary multiple points along a fiber simultaneously using random accessibility of a Brillouin optical correlation domain analysis system with a 5, 000 points/s sampling rate. A voltage-controlled oscillator is introduced for faster sweeping of the probe wave frequency to obtain the Brillouin gain spectrum. A higher-speed lock-in amplifier is also used for data detection. Several patterns of dynamic strain applied at five points selected arbitrarily along the fiber are measured simultaneously at a 5, 000 points/s sampling rate with random accessibility. This is the highest speed of random accessibility reported so far in Brillouin-based distributed fiber sensors.