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|Title: ||Impedance frequency characterization of a vibrating wire viscosity sensor with multiharmonic signals|
|Authors: ||Santos, José|
Janeiro, Fernando M.
Ramos, Pedro M.
|Keywords: ||Multiharmonic least-squares fitting|
Digital signal processor
|Issue Date: ||Sep-2014|
|Citation: ||20. José Santos, Fernando M. Janeiro, Pedro M. Ramos, “Impedance Frequency Characterization of a Vibrating Wire Viscosity Sensor with Mutiharmonic Signals”, Measurement, vol. 55, pp. 276-287, September 2014.|
|Abstract: ||This paper presents a method to estimate the impedance frequency response of a vibrating
wire viscosity sensor. The method is based on the application of a multiharmonic signal to
the measurement circuit, which includes the sensor. The signal is composed by the harmonics
that correspond to the frequencies at which the sensor’s impedance is to be estimated.
The impedance is determined using least-squares (LS) multiharmonic fitting
algorithms to obtain the amplitudes and phases of the harmonics of the impedance current
and voltage. The stimulus generation, measurement and estimation procedure is performed
by a dedicated developed measurement system. It includes a digital signal processor
(DSP) to perform all the calculations, control the programmable gain instrumentation
amplifiers (PGIAs) and communicate with the analog-to-digital converters (ADCs). The
PGIAs and ADCs, respectively, amplify and acquire the signals across the sensor and a reference
impedance which is used to limit and sample the current flowing through the wire
of the sensor. An auxiliary processor connected to a digital-to-analog converter manages
the stimulus generation. The system is connected by USB to a personal computer (PC)
where the measurement results can be stored, interpreted and further processed.|
|Appears in Collections:||FIS - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica|
CEM - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica
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