Impedance Glottography

Abstract

Impedance glottography, or electroglottography, is a noninvasive technique for monitoring the variation of the degree of contact between the vibrating vocal cords during voice production. Electrical impedance is sensed using a pair of electrodes placed on either side of the larynx, by injecting a low-level high-frequency current. A wide-band impedance detector circuit has been developed using a precision rectifier based on voltage feedback clamping amplifier and approximately linear-phase lowpass filter. The ci ....etc

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MICROPROCESSOR BASED IMPEDANCE RELAY



INTRODUCTION

In some applications it is necessary that the relay protecting a part of the power system operate for faults within a certain distance of the location on any one of the lines. The protecting scheme accordingly uses distance relays and is divided into three zones. The zones are classified based on the impedance seen by the relay and the relays are hence called impedance relays.

OPERRATING PRICIPLE OF THE IMPEDANCE RELAY[ ....etc

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IMPEDANCE SPECTROSCOPY
Presented by
Manu Gopal S
Applied Electronics and Instrumentation
College Of Engineering, Trivandrum
2007-11 batch



CONTENTS
Impedance spectroscopy
Its need and uses
Experimental set up
Circuit model for
Bare electrodes
Cell coated electrodes

Results
Conclusion
References

What is Impedance spectroscopy
EIS measures the dielectric properties of the medium as a function of frequency.
It is based on the interaction ....etc

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A high frequency electrical current of small voltage and amperage (physiologically safe) passes
between two electrodes situated on the surface of the throat at the level of the thyroid cartilage. The basic
configuration of the device is depicted in Fig.1. The electrodes are made of copper, silver or gold. They
have the form of rings or rectangles covering an area ranging from 3 cm
2
to 9 cm
2
. A third electrode is
often used as a reference for impedance measurements. It may be designed as a separate electrode or as a
ring electrode en ....etc

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Electrical Impedance Tomography



To begin with, the word tomography can be explained with reference to tomo and
graphy ; tomo originates from the Greek word tomos which means section or slice,
and graphy refers to representation. Hence tomography refers to any method which
involves reconstruction of the internal structural information within an object mathematically from a series of projections.
The projection here is the visual information probed using an emanation w ....etc

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