scholarly journals Relationship between moisture content and electrical impedance of carrot slices during drying

2015 ◽  
Vol 29 (1) ◽  
pp. 61-66 ◽  
Author(s):  
Ákos Kertész ◽  
Zuzana Hlaváčová ◽  
Eszter Vozáry ◽  
Lenka Staroňová
Keyword(s):  
Moisture Content ◽  
Electrical Impedance ◽  
Fruits And Vegetables ◽  
Physiological State ◽  
Impedance Measurement ◽  
Biological Tissues ◽  
Impedance Spectra ◽  
Frequency Range ◽  
Impedance Parameters ◽  
Precision Balance

Abstract Electrical properties of food materials can give information about the inner structure and physiological state of biological tissues. Generally, the process of drying of fruits and vegetables is followed by weight loss. The aim of this study was to measure the impedance spectra of carrot slices during drying and to correlate impedance parameters to moisture content in different drying periods. Cylindrical slices were cut out from the carrot root along the axis. The slices were dried in a Venticell 111 air oven at 50°C. The weight of the slices was measured with a Denver SI-603 electronic analytical and precision balance. The weighing of the samples was performed every 30 min at the beginning of drying and every 60 min after the process. The moisture content of the samples was calculated on wet basis. The magnitude and phase angle of electrical impedance of the slices were measured with HP 4284A and 4285A precision LCR meters in the frequency range from 30 Hz to 1 MHz and from 75 kHz to 30 MHz, respectively, at voltage 1 V. The impedance measurement was performed after weighting. The change in the magnitude of impedance during drying showed a good correlation with the change in the moisture content.

Connection between Moisture Content and Electrical Parameters of Apple Slices during Drying

2005 ◽  
Vol 1 (1) ◽  
pp. 95-121 ◽  
Author(s):  
Péter Mészáros ◽  
Eszter Vozáry ◽  
David B. Funk
Keyword(s):  
Weight Loss ◽  
Moisture Content ◽  
Electrical Impedance ◽  
Biological Tissues ◽  
Electrical Impedance Spectroscopy ◽  
Impedance Spectra ◽  
Membrane Structures ◽  
Apple Slices ◽  
Impedance Parameters ◽  
Lcr Meter

Generally the drying process of fruits is followed by weight loss. The weight loss characterizes only the global moisture content of fruits and does not give information about the inner state of tissue. Electrical impedance spectroscopy of biological tissues shows ab-dispersion band that is associated with membrane structures and is sensitive to their integrity and functionality. The aim of this study was to measure the impedance spectra of apple slices during drying and to correlate impedance parameters to moisture content in the different drying periods. The electrical impedance spectra of apple slices were determined during drying by an HP 4284A Precision LCR Meter in frequency range from 30 Hz up to 1 MHz. The measured spectra were approximated by Cole-impedance elements. Parameter values for the fitted curves that characterized the state of drying tissue showed good correlation with the moisture content calculated from weight loss in the two falling-rate drying periods.

scholarly journals A LabVIEW-based electrical bioimpedance spectroscopic data interpreter (LEBISDI) for biological tissue impedance analysis and equivalent circuit modelling

2019 ◽  
Vol 7 (1) ◽  
pp. 35-54 ◽  
Author(s):  
Tushar Kanti Bera ◽  
Nagaraju Jampana ◽  
Gilles Lubineau
Keyword(s):  
Electrical Impedance ◽  
Tissue Characterization ◽  
Impedance Analysis ◽  
Biological Tissues ◽  
Impedance Spectra ◽  
Circuit Element ◽  
Tissue Impedance ◽  
Wide Range ◽  
Electrical Bioimpedance ◽  
Impedance Parameters

Abstract Under an alternating electrical signal, biological tissues produce a complex electrical bioimpedance that is a function of tissue composition and applied signal frequencies. By studying the bioimpedance spectra of biological tissues over a wide range of frequencies, we can noninvasively probe the physiological properties of these tissues to detect possible pathological conditions. Electrical impedance spectroscopy (EIS) can provide the spectra that are needed to calculate impedance parameters within a wide range of frequencies. Before impedance parameters can be calculated and tissue information extracted, impedance spectra should be processed and analyzed by a dedicated software program. National Instruments (NI) Inc. offers LabVIEW, a fast, portable, robust, user-friendly platform for designing data-analyzing software. We developed a LabVIEW-based electrical bioimpedance spectroscopic data interpreter (LEBISDI) to analyze the electrical impedance spectra for tissue characterization in medical, biomedical and biological applications. Here, we test, calibrate and evaluate the performance of LEBISDI on the impedance data obtained from simulation studies as well as the practical EIS experimentations conducted on electronic circuit element combinations and the biological tissue samples. We analyze the Nyquist plots obtained from the EIS measurements and compare the equivalent circuit parameters calculated by LEBISDI with the corresponding original circuit parameters to assess the accuracy of the program developed. Calibration studies show that LEBISDI not only interpreted the simulated and circuit-element data accurately, but also successfully interpreted tissues impedance data and estimated the capacitive and resistive components produced by the compositions biological cells. Finally, LEBISDI efficiently calculated and analyzed variation in bioimpedance parameters of different tissue compositions, health and temperatures. LEBISDI can also be used for human tissue impedance analysis for electrical impedance-based tissue characterization, health analysis and disease diagnosis.

scholarly journals Импедансная спектроскопия электропроводящих композиционных материалов на основе микроволокон сополимера поливинилиденфторида с трифторэтиленом, модифицированных полипирролом

2021 ◽  
Vol 47 (11) ◽  
pp. 51
Author(s):  
В.М. Капралова ◽  
И.Ю. Сапурина ◽  
Н.Т. Сударь ◽  
А.А. Третьяков ◽  
O. Gryshkov ◽  
...  
Keyword(s):  
Polyvinylidene Fluoride ◽  
Electrical Impedance ◽  
Impedance Spectra ◽  
Frequency Range ◽  
Dielectric Characteristics ◽  
Circular Arc ◽  
Nanocomposite Polymer ◽  
Nanocomposite Polymer Electrolyte ◽  
Nonwoven Materials ◽  
Composite Nonwoven

The impedance spectra of composite nonwoven materials based on nano- and microfibers of polyvinylidene fluoride-trifluoroethylene copolymer modified by polypyrrole with different doping degree were studied in the frequency range 1000 Hz-5 MHz. It was found that an increase in the doping degree of polypyrrole coating of nanofibers leads to a decrease in the imaginary and real components of the electrical impedance. Regardless of their magnitude, the shape of the hodographs is close to circular arc resting on the ReZ axis, which allows us to consider the studied material as a nanocomposite polymer electrolyte whose dielectric characteristics can be reversibly changed.

Electrical impedance investigation of gamma-irradiated TlInS2〈5%C〉 crystals

2020 ◽  
pp. 2150009
Author(s):  
O. A. Samedov ◽  
O. Z. Alekperov ◽  
Kh. B. Orudjova ◽  
N. M. Mehtiyev ◽  
A. I. Nadjafov ◽  
...  
Keyword(s):  
Impedance Spectroscopy ◽  
Radiation Dose ◽  
Electric Field ◽  
Electrical Impedance ◽  
Impedance Spectra ◽  
Frequency Range ◽  
Measurement Frequency ◽  
Measured Frequency ◽  
Measured Frequency Range ◽  
Gamma Irradiated

In this article, the authors carry out a pioneering study of monocrystalline TlInS[Formula: see text] at higher than room-temperatures using impedance spectroscopy. It is shown that in TlInS[Formula: see text] crystals at temperatures higher than 400 K, the nature of conductivity is predominantly ionic. Moreover, characteristics of impedance spectra behavior of TlInS[Formula: see text] monocrystal samples were studied using the measurement frequency range of 25–106 Hz. For the measured frequency range, it is shown that curves of active and reactive impedance components undergo a dispersion characterized by decreasing values of [Formula: see text] and [Formula: see text], as the frequency of the electric field and radiation dose increases.

scholarly journals Very Low Resource Digital Implementation of Bioimpedance Analysis

Sensors ◽  
2019 ◽  
Vol 19 (15) ◽  
pp. 3381 ◽  
Author(s):  
Fabien Soulier ◽  
Achraf Lamlih ◽  
Vincent Kerzérho ◽  
Serge Bernard ◽  
Tristan Rouyer
Keyword(s):  
Integrated Circuit ◽  
Complex Analysis ◽  
Complex Impedance ◽  
Impedance Measurement ◽  
Biological Tissues ◽  
Frequency Range ◽  
Digital Implementation ◽  
Analysis Algorithm ◽  
Low Resource ◽  
Wide Range

Bioimpedance spectroscopy consists of measuring the complex impedance of biological tissues over a large frequency domain. This method is particularly convenient for physiological studies or health monitoring systems. For a wide range of applications, devices need to be portable, wearable or even implantable. Next generation of bioimpedance sensing systems thus require to be implemented with power and resource savings in mind. Impedance measurement methods are divided into two main categories. Some are based on “single-tone” signals while the others use “multi-tone” signals. The firsts benefit from a very simple analysis that may consist of synchronous demodulation. However, due to necessary frequency sweep, the total measurement may take a long time. On the other hand, generating a multi-frequency signal allows the seconds to cover the whole frequency range simultaneously. This is at the cost of a more complex analysis algorithm. This makes both approaches hardly suitable for embedded applications. In this paper, we propose an intermediate approach that combines the speed of multi-tone systems with a low-resource analysis algorithm. This results in a minimal implementation using only adders and synchronous adc. For optimal performances, this small footprint digital processing can be synthesized and embedded on a mixed-mode integrated circuit together with the analog front-end. Moreover, the proposed implementation is easily scalable to fit an arbitrary frequency range. We also show that the resulting impact on noise sensitivity can be mitigated.

scholarly journals Fatigue-Induced Cole Electrical Impedance Model Changes of Biceps Tissue Bioimpedance

2018 ◽  
Vol 2 (4) ◽  
pp. 27 ◽  
Author(s):  
Todd Freeborn ◽  
Bo Fu
Keyword(s):  
Fractional Order ◽  
Electrical Impedance ◽  
Biological Tissues ◽  
Impedance Model ◽  
Impedance Parameters ◽  
Mean Differences ◽  
Relative Errors ◽  
Induced Changes ◽  
Study Participants ◽  
Fractional Order Circuits

Bioimpedance, or the electrical impedance of biological tissues, describes the passive electrical properties of these materials. To simplify bioimpedance datasets, fractional-order equivalent circuit presentations are often used, with the Cole-impedance model being one of the most widely used fractional-order circuits for this purpose. In this work, bioimpedance measurements from 10 kHz to 100 kHz were collected from participants biceps tissues immediately prior and immediately post completion of a fatiguing exercise protocol. The Cole-impedance parameters that best fit these datasets were determined using numerical optimization procedures, with relative errors of within approximately ± 0.5 % and ± 2 % for the simulated resistance and reactance compared to the experimental data. Comparison between the pre and post fatigue Cole-impedance parameters shows that the R ∞ , R 1 , and f p components exhibited statistically significant mean differences as a result of the fatigue induced changes in the study participants.

LOW‐FREQUENCY IMPEDANCE PARAMETERS OF BASALT, GRANITE, AND QUARTZITE

Geophysics ◽  
1973 ◽  
Vol 38 (1) ◽  
pp. 68-75 ◽  
Author(s):  
A. S. Khalafalla ◽  
W. J. Maegley
Keyword(s):  
Room Temperature ◽  
Electrical Impedance ◽  
Analog Circuit ◽  
Low Frequency ◽  
Frequency Variation ◽  
Frequency Range ◽  
Argand Diagram ◽  
Circular Arcs ◽  
Impedance Parameters ◽  
Zero Frequency

An analog circuit digital computer setup was used to evaluate rock electrical impedance and phase angle in the frequency range 0.05 to 2 khz. Room‐temperature measurements were made on several samples of basalt, granite, and quartz. Argand diagram presentation of rock reactance as a function of its resistance at a series of frequencies described a semicircular arc. Rock impedance circular arcs can be used to define the rock resistivity at infinite frequency and the dc resistivity at the limit of zero frequency. Variation of rock resistance with the logarithm of frequency indicated finite rock dielectric dispersions at characteristic frequency ranges. Also, variation of rock reactance with the logarithm of frequency exhibited finite relaxation peaks, which can be used to difine the rock characteristics or turnover frequency as well as a characteristic or relaxation time.

scholarly journals Electrical characterization of bolus material as phantom for use in electrical impedance and computed tomography fusion imaging

2019 ◽  
Vol 5 (1) ◽  
pp. 34-39 ◽  
Author(s):  
Parvind K Grewal ◽  
Majid Shokoufi ◽  
Jeff Liu ◽  
Krishnan Kalpagam ◽  
Kirpal S Kohli
Keyword(s):  
Electrical Impedance ◽  
Electrical Characterization ◽  
Fusion Imaging ◽  
Biological Tissues ◽  
Frequency Range ◽  
Imaging Studies ◽  
Impedance Tomography ◽  
Clinical Imaging

Abstract Phantoms are widely used in medical imaging to predict image quality prior to clinical imaging. This paper discusses the possible use of bolus material, as a conductivity phantom, for validation and interpretation of electrical impedance tomography (EIT) images. Bolus is commonly used in radiation therapy to mimic tissue. When irradiated, it has radiological characteristics similar to tissue. With increased research interest in CT/EIT fusion imaging there is a need to find a material which has both the absorption coefficient and electrical conductivity similar to biological tissues. In the present study the electrical properties, specifically resistivity, of various commercially available bolus materials were characterized by comparing their frequency response with that of in-vivo connective adipose tissue. It was determined that the resistivity of Gelatin Bolus is similar to in-vivo tissue in the frequency range 10 kHz to 1MHz and therefore has potential to be used in EIT/CT fusion imaging studies.

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