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Sensors 2013, 13(11), 15068-15084; doi:10.3390/s131115068
Article

Digital Signal Processing by Virtual Instrumentation of a MEMS Magnetic Field Sensor for Biomedical Applications

1
, 1,2
, 3
, 3
, 4
, 5
, 6
 and 1,*
1 Micro and Nanotechnology Research Center, Universidad Veracruzana, Calzada Ruiz Cortines 455, Boca del Río 94294, Veracruz, Mexico 2 Depto. Control Automático, Centro de Investigación y de Estudios Avanzados del IPN (CINVESTAV-IPN), Av. IPN 2508, Col. Zacatenco 07360, D.F., Mexico 3 Institute of Physiology, Benemérita Universidad Autónoma de Puebla, 14 Sur 6301, Colonia San Manuel, Puebla 72570, Puebla, Mexico 4 Microelectronic Institute of Barcelona IMB-CNM, CSIC, Bellaterra 08193, Spain 5 Electronic Instrumentation and Atmospheric Sciences School, Universidad Veracruzana, Gonzalo Aguirre Beltran S/N, Xalapa 91000, Veracruz, Mexico 6 Depto. Ingeniería Mecánica, DICIS, Universidad de Guanajuato/Carretera Salamanca-Valle de Santiago km 3.5+1.8 km, Salamanca 36885, Guanajuato, Mexico
* Author to whom correspondence should be addressed.
Received: 1 July 2013 / Revised: 24 October 2013 / Accepted: 28 October 2013 / Published: 5 November 2013
(This article belongs to the Special Issue Biomedical Sensors and Systems)
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Abstract

We present a signal processing system with virtual instrumentation of a MEMS sensor to detect magnetic flux density for biomedical applications. This system consists of a magnetic field sensor, electronic components implemented on a printed circuit board (PCB), a data acquisition (DAQ) card, and a virtual instrument. It allows the development of a semi-portable prototype with the capacity to filter small electromagnetic interference signals through digital signal processing. The virtual instrument includes an algorithm to implement different configurations of infinite impulse response (IIR) filters. The PCB contains a precision instrumentation amplifier, a demodulator, a low-pass filter (LPF) and a buffer with operational amplifier. The proposed prototype is used for real-time non-invasive monitoring of magnetic flux density in the thoracic cage of rats. The response of the rat respiratory magnetogram displays a similar behavior as the rat electromyogram (EMG).
Keywords: digital signal processing; magnetic field sensor; magnetogram; MEMS; silicon resonator; virtual instrument digital signal processing; magnetic field sensor; magnetogram; MEMS; silicon resonator; virtual instrument
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Juárez-Aguirre, R.; Domínguez-Nicolás, S.M.; Manjarrez, E.; Tapia, J.A.; Figueras, E.; Vázquez-Leal, H.; Aguilera-Cortés, L.A.; Herrera-May, A.L. Digital Signal Processing by Virtual Instrumentation of a MEMS Magnetic Field Sensor for Biomedical Applications. Sensors 2013, 13, 15068-15084.

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