Dynamic Strain Measurement with Bandwidth Allocation by Using Random Accessibility of BOCDR

Osamu FURUKAWA  Hideo SHIDA  Shin-ichiro TEZUKA  Satoshi MATSUURA  Shoji ADACHI  

IEICE TRANSACTIONS on Communications   Vol.E102-B   No.5   pp.1069-1076
Publication Date: 2019/05/01
Publicized: 2018/11/13
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2018EBP3192
Type of Manuscript: PAPER
Category: Sensing
Brillouin scattering,  optical fiber sensor,  BOCDR,  dynamic-strain measurement,  random accessibility,  

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A Brillouin optical correlation domain reflectometry (BOCDR) system, which can set measuring point to arbitrary distance that is aligned in a random order along an optical fiber (i.e., random accessibility), is proposed to measure dynamic strain and experimentally evaluated. This random-access system can allocate measurement bandwidth to measuring point by assigning the measurement times at each measuring point of the total number of strain measurements. This assigned number is not always equally but as necessary for plural objects with different natural frequencies. To verify the system, strain of two vibrating objects with different natural frequencies was measured by one optical fiber which is attached to those objects. The system allocated appropriate measurement bandwidth to each object and simultaneously measured dynamic strain corresponding to the vibrating objects.