YOKOGAWA DTSXL, User Manual, Page: 266 / 289

< PART – C Operation and Maintenance >
C-13
IM 39J06B40-01EN 14th Edition: May 30, 2022
Figure Temperature Response Waveform Example
C3.1.2.
Effect of Internal Reflection in Sensor Optical Fiber
DTSX3000 measures temperature by measuring Raman scatter signal levels.
DTSX3000 measured temperatures near (within a range of tens of meters) high
reflection points such as sensor optical fiber connection points and sensor optical fiber
ends may be incorrect due to the effect of Rayleigh scattering.
C3.1.3.
Effect of Signal Processing
The DTSXL uses digital signal processing, which improves the temperature resolution.
The temperature resolution improves with increasing distance from a temperature
change point or a fiber connection point as shown in the figure below. Moreover, tiny
temperature changes might be undetected. This effect can be alleviated by lengthening
the measurement time or by using a sensor optical fiber having low fiber loss.
1m
Sampling point
Heated section
Actual
temperature
Measurement data