Sensor de nível de líquidos utilizando redes de Bragg em fibra óptica em fibra de carbono
This paper aims to demonstrate the development of a level sensor for liquids using optical fiber Bragg gratings (FBG). The motivation for the development of the sensor is the need for an alternative for measuring the liquid column level in systems that use conventional meters, in environments where...
| Autor principal: | Nicolini Junior, Ademir Carlos |
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| Formato: | Dissertação |
| Idioma: | Português |
| Publicado em: |
Universidade Tecnológica Federal do Paraná
2023
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| Assuntos: | |
| Acesso em linha: |
http://repositorio.utfpr.edu.br/jspui/handle/1/30846 |
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| Resumo: |
This paper aims to demonstrate the development of a level sensor for liquids using optical fiber Bragg gratings (FBG). The motivation for the development of the sensor is the need for an alternative for measuring the liquid column level in systems that use conventional meters, in environments where immunity to electromagnetic interference is a requirement, as well as in classified environments, which have risks of explosion, having a good precision to guarantee the high productivity and safety of the process. The encapsulation used in this project is based on the insertion of the FBG in carbon composite of the PRFC type (Polymers Reinforced by Carbon Fibers), forming a rigid diaphragm, which will suffer interference from the weight of the water column during the sensor tests. The validation of the test results is presented, and they are considered promising, with a variation of 24 pm in the Bragg wavelength corresponding to a change of 60 cm in the water column. The level variation was performed in steps, each with 10 cm and corresponding to a 4 pm shift in the Bragg wavelength. The average sensitivity for the verified pressure variation was 41.603 pm/kPa and the average sensitivity for the level variation was 0.408 pm/cm. The monitoring of the water temperature inside the device was performed with the installation of a second FBG encapsulated in a polyethylene tube and positioned approximately 5 cm above the diaphragm in which the sensor is inserted. The tests were carried out in the laboratory, with controlled ambient temperature. The temperature of the water inside the device remained practically constant, with small variations that corresponded to a Bragg wavelength of approximately 4 pm for the second FBG, not causing interference in the response of the level sensor. |
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