Memorias de investigación
Artículos en revistas:
A new way to find dielectric properties of liquid sample using thequartz crystal resonator (QCR)
Año:2015
Áreas de investigación
  • Tecnología electrónica y de las comunicaciones
Datos
Descripción
tThe main objective of this article is to demonstrate by performing experimental measurements how theequivalent capacitance C0changes when a fluid sample such as water is in contact with the crystal and torelate this change with the relative permittivity of the fluid. These measurements were compared withsimulations of traditional models like Butterworth?Van Dyke (BVD). To obtain the change of C0when thecrystal is in contact with water, the relation between the series resonance frequency (fs) and frequencyat minimum impedance with zero phase (fr) is used. To know these values, a new way of finding principalparameters in quartz crystal resonator (QCR) sensors, such as series resonant frequency (fs), half bandhalf width (? ) and maximum peak of conductance (Gm), is proposed; both for an unperturbed crystal anda crystal loaded with a liquid. The method consists in measuring the current (I) that flows through thecrystal and the voltage (V) between electrodes at frequency values near to resonance (sweep frequency).Additionally, the susceptance |B| of the crystal is also measured, multiplying the 90 degrees shifted currentof the crystal and its voltage, using a mixer. The DC component of this operation is proportional to thesusceptance of the crystal. With the magnitudes of the admittance and susceptance, the real value of theconductance |G| is obtained for each frequency value in the sweep. The conductance and susceptancecurves were fitted with a summation of Gaussian and sine functions respectively with the minor RMSEpossible.The proposed method has been compared with simulations done in COMSOL Multiphysics in order toverify the experimental results with simulation data. MATLAB curve fitting toolbox was used to fit theexperimental curves.
Internacional
Si
JCR del ISI
Si
Título de la revista
Sensors And Actuators a-Physical
ISSN
0924-4247
Factor de impacto JCR
1,943
Información de impacto
Volumen
239
DOI
Número de revista
Desde la página
153
Hasta la página
160
Mes
SIN MES
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Participantes
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Tecnologías de Apoyo a la Vida
  • Centro o Instituto I+D+i: Centro de tecnología Biomédica CTB
  • Departamento: Tecnología Fotónica y Bioingeniería