DFOS Applications introduction

DFOS (Distributed Fiber Optic Sensing) could take vibration, temperature and strain measurement on a fibre that is ten’s kilometers long.

Principle

Interrogator & fiber.

A laser pulse -> reflection(including Rayleigh, Raman and Brillouin )

• Reman: sensitive to temperature. (DTS, distributed temperature sensing)
• Brillouin: sensitive to strain and temperature. (DSS, distributed strain sensing)
• Rayleigh: sensitive to strain and temperature. (DAS, distributed acoustic sensing)

Benefit

• small size(as hair)
• endurance to harsh environments(made of glass)
• no electronic(no interference )
• high resolution(?)
• cheap
• continuous measurement

Example

• 4D VSP: 4D DAS VSP as a tool for frequent seismic monitoring in deep water
• DTS monitoring cement curing: A review of rheological modeling of cement slurry in oil well applications
• DTS pipeline leak detection
• DSS on pipeline and landslide monitoring: A decade of pipeline geotechnical monitoring using distributed fiber optic monitoring technology