title: Magnetic sensor for building structural vibrations.
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.
authors: Grupo de Sensores y Actuadores, Departamento de Tecnología de la Edificación, Universidad Politécnica de Madrid, 28040 Madrid, Spain. alfonso.garciag@upm.es.
authors: Alfonso
authors: A
authors: García
authors: Grupo de Sensores y Actuadores, Departamento de Tecnología de la Edificación, Universidad Politécnica de Madrid, 28040 Madrid, Spain. carlos.moron@upm.es.
authors: Carlos
authors: C
authors: Morón
authors: Grupo de Sensores y Actuadores, Departamento de Tecnología de la Edificación, Universidad Politécnica de Madrid, 28040 Madrid, Spain. enrique.tremps@upm.es.
authors: Enrique
authors: E
authors: Tremps