Comparison of two approaches to measurement of electrical impedance of glass microelectrodes designed for evaluation of temperature changes in biological tissues.

Comparison of two approaches to measurement of electrical impedance of glass microelectrodes designed for evaluation of temperature changes in biological tissues. Research Abstract Details 

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Comparison of two approaches to measurement of electrical impedance of glass microelectrodes designed for evaluation of temperature changes in biological tissues. Abstract Text:

F Rech,I Dittert,F Vyskocil,

We proposed a temperature sensitive microelectrode for rapid measurements of temperature at the cellular level. In principle, the electrical impedance of the tip of the microelectrode changes with temperature. We designed an impulse measurement system (STEP) sensitive to the above changes of impedance. The system is based on a presettable negative input impedance of the current to a voltage converter. We compared the efficiency of the new STEP with the currently used RAMP system. We found following advantages of the STEP system: i) the danger of high voltage oscillations which could mechanically destroy the microelectrode tip is eliminated; ii) this system provides the opportunity to set the maximum sensitivity of the system according to the measured temperature interval. Moreover, the STEP method makes it possible to measure the resistance by using a sinusoidal stimulation signal which has to be preliminarily compensated by a rectangular signal. The shortest sampling period of the new system represents 0.1 ms with a resolution higher than 0.1 K and sensitivity better than 30 mV/K.

Comparison of two approaches to measurement of electrical impedance of glass microelectrodes designed for evaluation of temperature changes in biological tissues. Publishing Authors By Initials

F Rech,I Dittert,F Vyskocil,

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Comparison of two approaches to measurement of electrical impedance of glass microelectrodes designed for evaluation of temperature changes in biological tissues. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Physiological research / Academia Scientiarum Bohe

VOLUME: 41

Page Numbers: 251-5

Journal Abbreviation: Physiol Res

ISSN: 0862-8408

DAY: 2

MONTH: 04

YEAR: 1992

Comparison of two approaches to measurement of electrical impedance of glass microelectrodes designed for evaluation of temperature changes in biological tissues. Information

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LANGUAGE: eng

NlmUniqueID: 9112413

Comparison of two approaches to measurement of electrical impedance of glass microelectrodes designed for evaluation of temperature changes in biological tissues. Keywords Mesh Terms:

KEYWORDS: Thermometers

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Chemical & Substance for Abstract: Comparison of two approaches to measurement of electrical impedance of glass microelectrodes designed for evaluation of temperature changes in biological tissues. Information

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Grant and Affiliation Information for Comparison of two approaches to measurement of electrical impedance of glass microelectrodes designed for evaluation of temperature changes in biological tissues.

AFFILIATION: Institute of Physiology, Czechoslovak Academy of Sciences, Prague.

Country: CZECHOSLOVAKIA

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MEDLINETA: Physiol Res

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