Specifications and Regulatory Information
Temperature resolution
(standard deviation over distance)
Specifies the variations in the measured temperature at points i
along the sensing fiber held at uniform temperature. Only higher
spatial frequencies of the variations are considered. Higher
frequency variations are calculated as the difference H
i
between
measured curve and smoothed curve. The smoothed curve
calculated as the average measured temperature within
smoothing window around each point i.
Temperature resolution TRes is calculated as:
TRes = StDev
true,i
{ H
i
}
StDev
true,i
{} denotes the true standard deviation over points i.
Conditions: Using a “Reference sensing fiber”. Sensing fiber
with maximum length and loss as specified. Spatial resolution as
specified.
Note: The true standard deviation is derived from the empirical
standard deviations of repeated measurements. The empirical
standard deviation of a single measurement may be higher or
lower than the specified value.
Measurement: Smoothing window size s = 50 m (±25 m around
each point). Sampling resolution set to minimum (0.5 m).
Typical value
Typical value is a characteristic describing the product
performance that is usually met, but not guaranteed.
The Protectowire Company, Inc.
FIBERSYSTEM 8000 - Linear Heat
Series
Higher frequency variations
Measured temperature
Smoothed curve
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