Detail publikace

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

Originální název

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

Anglický název

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

Jazyk

en

Originální abstrakt

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.

Anglický abstrakt

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.

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"
}