Name: Fabio Giesen Ludke
Type: MSc dissertation
Publication date: 27/05/2020

Name Rolesort descending
Maria Jose Pontes Advisor *
Anselmo Frizera Neto Co-advisor *

Examining board:

Name Rolesort descending
Maria Jose Pontes Advisor *
Anselmo Frizera Neto Co advisor *
Adilson Ribeiro Prado External Examiner *
Arnaldo Gomes Leal Júnior Internal Examiner *

Summary: This dissertation presents the study and application of fiber Bragg grating (FBG) sensors used in water and oil interface level mensuration. Through industrial rubber diaphragms, which has a fiber Bragg grating segment on the inside, it is possible to show an interface level. The references presented demonstrates how FBG sensors used in water and oil interface level mensuration works. The FBG sensors are non-conductive, resistant to electromagnetic interference (EMI) and mimic explosive environments. A typical phase mask and plane-by-plane technique inscription have been used to manufacture the sensors and using a spectrometer, you can analyze the coupled light wavelength and how the light propagate in FBG segment. The analyzes are performed defining central wavelength for each FBG used, WHERE the strain in FBG induce a wavelength shift relative to different materials interface level, for example, water and oil. Thus, as water and oil have different densities and depending on the amount of material that is in the tank, the diaphragms with FBG undergoing less or greater deformation and causing a proportional wavelength shift variation of the light.The main materials used in the production of the FBG sensors are silica optical fiber, thermoplastic polyurethane and nitrile rubber. Nitrile rubber has a high resistance to petroleum and derivatives. A methodology was developed for production of FBG sensors with diaphragms printed on the 3D printer and using the nitrile rubber vulcanization. A diaphragm sensor with FBG was developed using a 3D printer for pressure measurement. The sensor developed through the vulcanization of nitrile diaphragms with FBG was produced using a press system with temperature control. The influence caused by the variation in diaphragm thickness is observed in the tests with printed diaphragms on 3D printer. This variation doesn’t change the linearity of the system, but change its sensitivity. The earned sensitivities were 7.5 pm/kPa and 5.2 pm/kPa for the diaphragm of 1.2 mm and 2 mm, respectively. It was possible to identify the oil and water interface level in the tests with nitrile diaphragms. At the end an equation was obtained, WHERE it is possible to measure interface level through the diaphragm deformation, showing that is possible to use this system to produce a product in the future.

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