Publication detail

Electro-Ultrasonic Spectroscopy - New Method for Ppolymer Based Conducting Layers Characterisation

SEDLÁKOVÁ, V. ŠIKULA, J. MAJZNER, J.

Original Title

Electro-Ultrasonic Spectroscopy - New Method for Ppolymer Based Conducting Layers Characterisation

English Title

Electro-Ultrasonic Spectroscopy - New Method for Ppolymer Based Conducting Layers Characterisation

Type

conference paper

Language

en

Original Abstract

We have studied the properties of polymer based thick film layers by the new method - Electro-Ultrasonic Spectroscopy. The polymer based thick film layers has granular like structure given by the composition of carbon (C) spherical particles and graphite (Gr) flakes suspended in the polymer vehicle. The ultrasonic signal of frequency fU changes the contact area between conducting grains and then resistance is modulated by the frequency of ultrasonic excitation. An intermodulation voltage Um is created on the structure. It depends on the value of AC current varying with frequency fE and on the ultrasonic excited resistance change ?R varying with frequency fU. The intermodulation component of frequency fm = fE - fU varies linearly with electric excitation. The measurement of the low frequency noise shows that the noise spectral density is 1/fa type and it is proportional to the square of electric current. The frequency factor a is very near to 1. Simultaneous measurement of electrical noise and amplitude of intermodulation signal shows that intermodulation signal amplitude is correlated with the noise spectral density. Noise, resistance and intermodulation voltage are influenced by the quality and number of point contacts in the resistor structure.

English abstract

We have studied the properties of polymer based thick film layers by the new method - Electro-Ultrasonic Spectroscopy. The polymer based thick film layers has granular like structure given by the composition of carbon (C) spherical particles and graphite (Gr) flakes suspended in the polymer vehicle. The ultrasonic signal of frequency fU changes the contact area between conducting grains and then resistance is modulated by the frequency of ultrasonic excitation. An intermodulation voltage Um is created on the structure. It depends on the value of AC current varying with frequency fE and on the ultrasonic excited resistance change ?R varying with frequency fU. The intermodulation component of frequency fm = fE - fU varies linearly with electric excitation. The measurement of the low frequency noise shows that the noise spectral density is 1/fa type and it is proportional to the square of electric current. The frequency factor a is very near to 1. Simultaneous measurement of electrical noise and amplitude of intermodulation signal shows that intermodulation signal amplitude is correlated with the noise spectral density. Noise, resistance and intermodulation voltage are influenced by the quality and number of point contacts in the resistor structure.

Keywords

Noise, Electro-Ultrasonic Spectroscopy, Non-destructive Testing, Thick Film

RIV year

2007

Released

10.11.2007

Publisher

Ústav fyziky FEKT VUT v Brně

Location

Brno, ČR

ISBN

978-80-7355-078-3

Book

Proceedings of the conference New Trends in Physics

Pages from

130

Pages to

133

Pages count

4

BibTex


@inproceedings{BUT27980,
  author="Vlasta {Sedláková} and Josef {Šikula} and Jiří {Majzner}",
  title="Electro-Ultrasonic Spectroscopy - New Method for Ppolymer Based Conducting Layers Characterisation",
  annote="We have studied the properties of polymer based thick film layers by the new method - Electro-Ultrasonic Spectroscopy.   The polymer based thick film layers has granular like structure given by the composition of carbon (C) spherical particles and graphite (Gr) flakes suspended in the polymer vehicle. The ultrasonic signal of frequency fU changes the contact area between conducting grains and then resistance is modulated by the frequency of ultrasonic excitation. An intermodulation voltage Um is created on the structure. It depends on the value of AC current varying with frequency fE and on the ultrasonic excited resistance change ?R varying with frequency fU. The intermodulation component of frequency fm = fE - fU varies linearly with electric excitation. The measurement of the low frequency noise shows that the noise spectral density is 1/fa type and it is proportional to the square of electric current. The frequency factor a is very near to 1. Simultaneous measurement of electrical noise and amplitude of intermodulation signal shows that intermodulation signal amplitude is correlated with the noise spectral density. Noise, resistance and intermodulation voltage are influenced by the quality and number of point contacts in the resistor structure.",
  address="Ústav fyziky FEKT VUT v Brně",
  booktitle="Proceedings of the conference New Trends in Physics",
  chapter="27980",
  institution="Ústav fyziky FEKT VUT v Brně",
  year="2007",
  month="november",
  pages="130--133",
  publisher="Ústav fyziky FEKT VUT v Brně",
  type="conference paper"
}