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< PART – B Software >
B-83
IM 39J06B40-01EN 14th Edition: May 30, 2022
SEE ALSO
For details on the System Configuration window, see Chapter B6, “System Configuration.”
- Sampling Resolution
Select either 1 m or 2 m for the sampling resolution.
The maximum allowable sampling size is 30000. Accordingly, the specified distance
range divided by the specified sampling resolution must not exceed 30,000.
6 km 10 km 16 km 20 km 30 km 50 km
50 cm
○ ○ × × × ×
1 m
○ ○ ○ ○ ○ ×
2 m
○ ○ ○ ○ ○ ○
- Averaging
Select either Averaging Times to specify the number of measurements used for
averaging or Measurement Time to specify the measurement time.
If Averaging Times is selected, specify a value as a power of 2 from 12 to 28 (2 12 to
2 28 ) in units of 1 (2 1 ).
If Measurement Time is selected, specify a value from 1 [sec] to 86400 [sec] in units
of 1 [sec]. The specified [Measurement Time] is used together with the [Reptation
Rate], [Distance Range], [Sampling Resolution] and [Principle] settings to calculate
the number of measurements to be used for averaging. If the calculated value
exceeds 2
28
, it is taken as 2
28
.
The measurement time excludes alarm detection time, sectional data generation
time and measurement data file creation/transfer time.
Tip
- The [Averaging] parameter determines the number of measurements used for averaging. Averaging
can be used to improve the signal-noise ratio when the Raman scatter signal level is very weak.
SEE ALSO
- For details on the [Principle] setting, see Subsection B7.2.1, “Sequence Table Settings.”
- For details on alarm decision, see Chapter B9, “Alarm Detection.”
- For details on sectional data generation, see Chapter B10, “Sectional Data Generation.”
- For details on measurement data file creation/transfer time, see Chapter B8, “Measurement Data
Output”
- Fiber Failure Detection
Specify the condition for sensor optical fiber failure detection. If On is selected, a
fiber failure is detected and an alarm is generated if the ST value exceeds the
specified [Threshold] (sensor optical fiber threshold value) during measurement.
Specify a threshold level from 0.1 [dB] to 99.9 [dB] in units of 0.1 [dB].
If On is not selected, fiber failure detection is not done.
Tip
Fiber failure is detectable from 0 [m] to [Fiber End] - X [m], where X varies with [Fiber End] (length).
<Reference> 0
～
10 km : X=10[m], 10
～
20km : X=20[m], 20
～
30km : X=30[m], 30
～
40km : X=40[m],
40
～
50km : X=50[m]