Chirp pulse excitation in the impedance spectroscopy of dynamic subjects—Signal modelling in time and frequency domain

2011 ◽  
pp. 87-90
Keyword(s):  
Impedance Spectroscopy ◽  
Frequency Domain ◽  
Pulse Excitation ◽  
Chirp Pulse ◽  
Signal Modelling

Influence of Lanthanum Concentration on Properties of BLT Electroceramics

2012 ◽  
Vol 512-515 ◽  
pp. 1308-1312 ◽  
Author(s):  
Beata Wodecka-Duś ◽  
Agata Lisińska-Czekaj ◽  
Dionizy Czekaj
Keyword(s):  
Dielectric Properties ◽  
Electrical Properties ◽  
Impedance Spectroscopy ◽  
Frequency Domain ◽  
Room Temperature ◽  
Ferroelectric Properties ◽  
Lcr Meter ◽  
La Doped

Results of fabrication and study of Ba1-xLaxTi1-x/4O3(BLT) ceramics for x within the range 0.001≤x≤0.004 is reported in the present paper. BLT ceramics has a structure based on ABO3–type perovskite, and its properties strongly depend on the chemical comSubscript textposition. The interrelated semiconductor and ferroelectric properties of La-doped BaTiO3ceramics were considered for describing its electrical properties. Dielectric properties were studied in frequency domain by impedance spectroscopy with a Quadtech 1920-type precision LCR meter at room temperature T=RT.

scholarly journals Impedance Spectroscopy and Cyclic Voltammetry to Determine Double Layer Capacitances and Electrochemically Active Surface Areas

2018 ◽  
Author(s):  
Maximilian Schalenbach
Keyword(s):  
Cyclic Voltammetry ◽  
Impedance Spectroscopy ◽  
Frequency Domain ◽  
Surface Area ◽  
Double Layer ◽  
Active Surface ◽  
Scattering Data ◽  
Gold Electrodes ◽  
Electrochemically Active ◽  
Electrochemically Active Surface

The electrochemically active surface area (ECSA) of an electrode can be estimated by means of double layer capacitance (DLC) measurements using impedance spectroscopy and cyclic voltammetry. In this study, the responses of smooth and porous gold electrodes (chosen as model systems) to both methods are measured and described by physical models. I point out that diffusion limited adsorption processes significantly contribute to the measured responses and thus complicate the estimation of DLCs. Impedance is derived to be in most cases more suitable for measuring DLCs as higher frequencies are available and as contributions of serial resistances and capacitances can be separately evaluated in the frequency domain. The relaxation properties in the frequency domain are shown to display a useful tool to survey the accuracy of the DLC estimation. The DLCs of polished gold electrodes are shown to be proportional to their geometric surface area. From these measurements a specific DLC of 6±2 μF/cm² of gold in perchloric acid is determined, which agrees with the lowest reported values of strongly scattering data in the literature. A handy flow chart for experimentalists to determine electrode capacitances from impedance spectra is proposed.

Digital video-electrochemistry (DVEC) to assess electrochromic materials in the frequency domain: RGB colorimetry impedance spectroscopy

2021 ◽  
Vol 366 ◽  
pp. 137340
Author(s):  
Esteban Guillén ◽  
María Ferrer-Roselló ◽  
Jerónimo Agrisuelas ◽  
José J. García-Jareño ◽  
Francisco Vicente
Keyword(s):  
Impedance Spectroscopy ◽  
Frequency Domain ◽  
Digital Video ◽  
Electrochromic Materials

Dielectric properties of processed cheese

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Chin Han Chan ◽  
Jean-Marc Saiter ◽  
Hubert Eudier ◽  
Hans-Werner Kammer
Keyword(s):  
Dielectric Properties ◽  
Impedance Spectroscopy ◽  
Frequency Domain ◽  
Food Quality ◽  
Low Frequency ◽  
Relaxation Behavior ◽  
Impedance Spectra ◽  
Processed Cheese ◽  
Dynamic Studies

Abstract Dynamic studies of several processed cheeses were carried out for evaluation of their dielectric properties and their relaxation behavior. Impedance spectroscopy has been used to study the systems under discussion in low-frequency domain. A substantial number of impedance spectra will be given and discussed that relate the dielectric properties to food nutrients. Also influence of moisture on food quality might be evaluated.

CONTROLLING WAVE PACKET INTERFERENCE OF DISSOCIATING MOLECULES BY SHAPING LASER PULSES IN FREQUENCY DOMAIN

2008 ◽  
Vol 07 (06) ◽  
pp. 1159-1169 ◽  
Author(s):  
YONG-CHANG HAN ◽  
KAI-JUN YUAN ◽  
SHU-LIN CONG
Keyword(s):  
Wave Packet ◽  
Frequency Domain ◽  
Laser Field ◽  
Wave Packets ◽  
Laser Pulses ◽  
Time Dependent ◽  
Pulse Excitation ◽  
Density Functions ◽  
Excitation Scheme ◽  
Quantum Wave

The interference of dissociating wave packets for the Br 2 molecule in femtosecond laser field is studied theoretically using time-dependent quantum wave packet method. The interference of dissociating wave packets can be determined by the spectrum of laser field. By shaping laser pulses in frequency domain, the corresponding R- and v-dependent density functions can be effectively controlled. Compared with the 2-pulse excitation scheme, the resolution of the interference patterns can be improved by using 3- and 4-pulse excitation schemes. The dissociating velocity can be steered by varying laser parameters.

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