SENSORES INDUTIVOS DE BAIXO CUSTO PARA IDENTIFICAÇÃO DE NÍVEIS DE INTERFACE DE FLUIDOS COM PROPRIEDADES MAGNÉTICAS DISTINTAS
Name: THIAGO DA SILVA ORNELLAS
Publication date: 24/04/2023
Examining board:
Name |
Role |
|---|---|
| ALEXANDRE BESSA DOS SANTOS | Examinador Externo |
| CARLOS EDUARDO SCHMIDT CASTELLANI | Examinador Interno |
| MARCELO EDUARDO VIEIRA SEGATTO | Coorientador |
| MARIA JOSE PONTES | Presidente |
Summary: In the industry, several methods of measuring and monitoring fluid and
interface levels are identified, from floating elements to ultrasonic sensors [19],
both with their advantages and disadvantages. This Master thesis developed a
set of inductive sensors to identify fluids as well as the interface between two
different fluids. The sensors are distributed vertically inside a tube, so that it can
be installed within heterogeneous fluid storage tanks. Each inductive sensor has
the ability to differentiate fluids due to the variation in the magnetic coupling
existing between the primary and secondary windings of each sensor structure.
Thus, the mutual inductance between the windings is responsible for the
variation in the inductive reactance of the equivalent circuit. The electronic circuit
of each sensor is designed so that the addition of inductive reactance favors
impedance matching, optimizing the output power read by the interrogation
stage of the system. It was demonstrated that, with this detection mechanism,
the sensors require little electrical current, since it is not specifically about
measuring conductivity, it means induction of electrical current in the fluid,
resulting in a safer process.
In addition, a supervisory software was developed to monitor fluid levels
in real time. The tests carried out allowed level measurements from 3.3 cm thick
with a relative error of approximately 8%. The resolution of the fluid level
measurement is designed based on the vertical spacing between the sensors.
Keywords: Inductive sensors, multiphase interface levels, magnetic coupling,
mutual inductance, impedance matching.
