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< PART – C Operation and Maintenance >
C-7
IM 39J06B40-01EN 14th Edition: May 30, 2022
* W denotes the optical switch exit position; E denotes the sensor optical fiber end position
Figure Double-ended Measurement Illustration Diagram
If sensor optical fiber failure is detected at any position on the sensor optical fiber,
measurement results of the forward and reverse directions up to the sensor optical fiber
failure position are combined.
Signal level [dB]
Anti-Stokes
(Reverse)
Stokes (Forward) Stokes (Reverse)
Anti-Stokes
(Forward)
W E
Signal level [dB]
Distance [m]
Anti-Stokes
Stokes
Combined measurement in sensor
● Signal level distribution
● Combined measurement of both directions
Distance [m]