Design and functional validation of a complex impedance measurement device for characterization of ultrasonic transducers

2013 ◽  
Author(s):  
Wouter De Cock ◽  
Jan Cools ◽  
Paul Leroux
Keyword(s):  
Complex Impedance ◽  
Impedance Measurement ◽  
Ultrasonic Transducers ◽  
Functional Validation ◽  
Measurement Device ◽  
Complex Impedance Measurement

ONE DIMENSIONAL NATURE OF IONIC CONDUCTIVITY IN SELF-FLUX GROWN RbTiOPO4 SINGLE CRYSTALS

2003 ◽  
Vol 17 (03) ◽  
pp. 373-382 ◽  
Author(s):  
C. V. KANNAN ◽  
S. GANESAMOORTHY ◽  
C. SUBRAMANIAN ◽  
P. RAMASAMY
Keyword(s):  
Ionic Conductivity ◽  
Ionic Conduction ◽  
Complex Impedance ◽  
Impedance Measurement ◽  
Dielectric Polarization ◽  
One Dimensional ◽  
Measured Activation Energy ◽  
Conduction Behavior ◽  
Measured Activation ◽  
Complex Impedance Measurement

The ionic conductivity of self-flux grown RbTiOPO 4 single crystal along the crystallographic a, b and c (polar) axes in the frequency range 100 Hz–10 MHz and in the temperature range 300–1140 K has been studied. The measured activation energy indicates the existence of super ionic conduction behavior in RTP crystals and also reveals that the DC electrical conduction and dielectric polarization are governed by the same mechanism. Complex impedance measurement shows the existence of non-Debye type of relaxation in the crystals.

Complex Impedance Measurement System for the Frequency Range from 5 kHz to 100 kHz

2015 ◽  
Vol 644 ◽  
pp. 133-136 ◽  
Author(s):  
Mitar Simić
Keyword(s):  
Measurement System ◽  
Integrated Circuit ◽  
Complex Impedance ◽  
Impedance Measurement ◽  
Wide Range ◽  
Measurement Results ◽  
Improved Design ◽  
Sd Card ◽  
Complex Impedance Measurement ◽  
Line Analysis

The improved design of previously developed complex impedance measurement system is described. Realized system for measurement of complex impedance is based on integrated circuit AD5933 which is controlled by microcontroller ATmega128. Device has full standalone capabilities with LCD for displaying of results and keyboard for configuration on the field. Created report with measured values of impedance magnitude and phase angle is stored on micro SD card in format compatible with MS Excel which ensures easy off-line analysis on PC. Realized device is equipped with self-calibration system which ensures high accuracy in wide range of impedance and frequency. In the aim of the verification of developed system, the measurement results are plotted and compared with theoretical impedance values. Realized system can be used for complex impedance measurement, impedance spectrometry, biomedical and automotive sensors, proximity sensors, FFT processing, structural health monitoring, etc.

Application of AC Impedance Spectroscopy for Characterization of BiNbO4 Ceramics

2012 ◽  
Vol 512-515 ◽  
pp. 1193-1197 ◽  
Author(s):  
Agata Lisińska-Czekaj ◽  
Beata Wodecka-Duś ◽  
Dionizy Czekaj
Keyword(s):  
Impedance Spectroscopy ◽  
Least Squares Method ◽  
Complex Impedance ◽  
Impedance Measurement ◽  
Simulated Data ◽  
Electrode Processes ◽  
Usual Representation ◽  
Ac Response ◽  
Input Perturbation

Impedance spectroscopy is known as an important technique used for describing the electrical processes occurring in a system on applying an ac signal as input perturbation. In the present paper results of a study of BiNbO4 ceramics fabricated by mixed oxide method and sintered by free sintering are reported. Results on the ac response of the electroceramic samples by impedance spectroscopy at temperature T= 100 – 400 °C are given. The usual representation (i.e. Z” vs. Z’ where Z’ and Z” are the real and imaginary parts of the complex impedance, respectively) as well as the alternative representations of the impedance measurement (electrical modulus representation) was used to interpret the impedance spectra of BiNbO4 ceramics in order to obtain separate contributions of the bulk, grain boundary and electrode processes. The Kramers-Kronig data validation test was employed in the impedance data analysis. Experimental data of impedance spectroscopy were fitted to the corresponding equivalent circuit using the complex non-linear least squares method. Agreement between experimental and simulated data was established.

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