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Sensors 2014, 14(2), 2468-2475; doi:10.3390/s140202468

Magnetic Sensor for Building Structural Vibrations

Grupo de Sensores y Actuadores, Departamento de Tecnología de la Edificación, Universidad Politécnica de Madrid, 28040 Madrid, Spain
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Received: 20 December 2013 / Revised: 24 January 2014 / Accepted: 24 January 2014 / Published: 5 February 2014
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Spain 2013)
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Abstract

This paper shows a new displacement-to-frequency transducer based on the variation of a coil inductance when a magnetic core is partially or completely inserted inside. This transducer is based on a Colpitts oscillator due its low manufacturing price, behavior and immunity to noise. A tank circuit with a configuration in parallel was used because it can be employed at lower frequencies and it enables it to make a direct analysis. The sensor has a dynamic range equal to the length of the coil. The cores can exchange sensors (coils with its ferromagnetic core) using the same electronic measuring system. In this way, with only an electronic circuit, the core sensor determines the measurement range. The obtained resolution is higher than 1/100,000, and the sensor also allows the measurement and knowing in real time the effect of vibration, thermal expansion, referred overload movements, etc.., that can occur in the structural elements of a building.
Keywords: magnetic sensor; displacement; vibration; self-induction magnetic sensor; displacement; vibration; self-induction
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

García, A.; Morón, C.; Tremps, E. Magnetic Sensor for Building Structural Vibrations. Sensors 2014, 14, 2468-2475.

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