Name: Rogerio da Silva Marques
Type: MSc dissertation
Publication date: 18/12/2015
Advisor:

Namesort descending Role
Maria Jose Pontes Advisor *
Moisés Renato Nunes Ribeiro Co-advisor *

Examining board:

Namesort descending Role
Anselmo Frizera Neto Internal Examiner *
Maria Jose Pontes Advisor *
Moisés Renato Nunes Ribeiro Co advisor *
Shirley Peroni Neves Cani External Examiner *

Summary: Temperature monitoring is a critical activity for the whole oil & gas industry.
The challenges involved in crude oil storage at hazardous production sites open
opportunities for new sensing systems capable of safely performing dynamic tem-
perature tank profiling. This article presents a corrosion resistant, maneuverable,
and intrinsically safe temperature optical sensor based on fiber Bragg grating (FBG).
The presented sensor head is based on multiple FBG inscribed in a lengthy single
mode fiber. The sensor presents an average thermal sensitivity of 8.82±0.09 pm/°C,
resulting in a typical temperature resolution of ∼ 0.1 oC and an average time cons-
tant value of 6.25 ± 0.08 s.
Polytetrafluoroethylene (PTFE) was proposed as a means of simultaneously iso-
lating the optical fiber from the corrosive environment and avoiding undesirable
mechanical tensions over FBGs. PTFE also improves the overall sensor robustness
without impairing its handling features.
Corrosion and degradation resistance were verified by infrared spectroscopy and
scanning electron microscopy along 90 days exposition to high salinity crude oil
samples. The developed sensor was tested in a field pilot test, reproducing the ope-
ration of an in land crude tank, demonstrating its abilities to dynamically monitor
temperature profile.

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