Impedance Estimation of a Vibrating Wire Viscosity Sensor Using Multi-Harmonic Signals |
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| José Santos, Pedro M. Ramos |
- Abstract:
- This paper presents a method to estimate the impedance response of a vibrating wire viscosity sensor. The method is based on the application of a multi-harmonic signal at the terminals of the sensor. The signal is composed by the harmonics that correspond to the frequencies at which one wants to obtain the impedance of the sensor. The impedance is determined using least-squares (LS) multi-harmonic fitting algorithms to estimate the amplitudes and phases of the harmonics of the impedance current and voltage. The measurement and estimation procedure is performed by a dedicated developed measurement system. It includes a digital signal processor (DSP) to perform all the calculations, programmable gain instrumentation amplifiers (PGIA) and analog to digital converters (ADC) to amplify and acquire the signals across the sensor and a reference impedance used to limit and sample the current flowing through the wire of the sensor. The system is connected via USB to a personal computer (PC) where the measurement results can be stored, interpreted and further processed.
- Keywords:
- Multi-Harmonic Fitting, Impedance Estimation, Viscosity Sensor, DSP
- Download:
- IMEKO-TC4-2013-064.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC4
- Event name:
- TC4 Symposium 2013
- Title:
- 19th IMEKO TC4 Symposium Measurements of Electrical Quantities (together with 17th TC4 IWADC Workshop on ADC and DAC Modelling and Testing)
- Place:
- Barcelona, SPAIN
- Time:
- 18 July 2013 - 19 July 2013