Abstract
We developed a distributed vibration sensor by using heterodyne detection
and signal processing of moving averaging and moving differential for the
phase optical time domain reflectometry system. The broadband acoustic
frequency components generated by pencil-break vibration have been measured
and identified in location by our distributed vibration sensor for the first
time. Pencil break measurement is a standard technique to emulate the
acoustic emission of cracks in concrete or steel bridges for early crack
identification. The spatial resolution is 5m and the highest frequency
response is 1 kHz, which is limited by the trigger frequency of data
acquisition card. This new sensing system can be used for vibration
detection of health monitoring of various civil structures as well as any
dynamic monitoring requirement.
© 2010 IEEE
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