A Novel Approach to Raman Distributed Temperature-Sensing System for Short-Range Applications

Area of Science:

• Optoelectronics
• Fiber Optics Sensing
• Photonics

Background:

• Distributed Temperature-Sensing (DTS) systems are crucial for monitoring temperature profiles.
• Traditional Raman DTS systems use short optical pulses to maximize measurement precision.
• Multimode optical fibers offer potential for novel sensing applications.

Purpose of the Study:

• To develop a novel Distributed Temperature-Sensing (DTS) system using Raman scattering in multimode optical fibers.
• To explore the use of long optical pulses for temperature profile measurement.
• To simplify DTS system electronics and reduce laser power requirements.

Main Methods:

• Utilized Raman scattering in multimode optical fibers operating around 800 nm.
• Employed long optical pulses with a width matching the fiber length under test.
• Applied numerical post-processing for temperature profile extraction.

Main Results:

• Achieved a temperature measurement precision of approximately ±3 °C.
• Obtained a spatial resolution of 8 meters.
• Demonstrated simplified electronic circuit development and reduced laser peak power requirements.

Conclusions:

• The novel DTS approach using long Raman pulses is effective for temperature profiling over hundreds of meters.
• This technique offers advantages in terms of system simplicity and power efficiency.
• The method provides a viable alternative to conventional narrow pulse DTS systems.