Apparatus for deriving measurement signals from fibre optic distributed sensors
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United States of America Patent
Stats
-
Mar 6, 2018
Issued Date -
N/A
app pub date -
Apr 6, 2012
filing date -
Apr 8, 2011
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The application describes methods and apparatus for distributed fiber sensing, especially distributed acoustic/strain sensing. The method involves launching at least first and second pulse pairs into an optical fiber, the first and second pulse pairs having the same frequency configuration as one another and being generated such that the phase relationship of the pulses of the first pulse pair has a predetermined relative phase difference to the phase relationship of the pulses of the second pulse pair. In one embodiment there is a frequency difference between the pulses in a pulse pair which is related to the launch rate of the pulse pairs. In another embodiment the phase difference between the pulses in a pair is varied between successive launches. In this way an analytic version of the backscatter interference signal can be generated within the baseband of the sensor.
First Claim
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Family
International Classification(s)
- 2012 Application Filing Year
- G01J Class
- 1369 Applications Filed
- 1088 Patents Issued To-Date
- 79.48 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 18 Citation Count
- G01J Class
- 89.83 % this patent is cited more than
- 7 Age
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