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Flicker-noise measurement for gas media analytic
Automation, modeling and energy supply in oil and gas sector

Authors: Alexandr Alexandrovich CHAPKEVICH was born in 1983. In 2008 he was gradua- ted from the Lomonosov Moscow State University (Faculty of Physics). Currently Ale- xandr A. Chapkevich works as a research worker at Gubkin Russian State University of Oil and Gas (Faculty of Physical and Colloid Chemistry). He is author over 25 publications in the field of adsorption-desorption flicker-noise spectroscopy (FNS) for high-ohmic semiconductor gas sensors. Е-mail: chapkevich@mail.ru
Ruslan Vladimirivich BELYANKIN was born in 1977. In 2000 he graduated from the Moscow Power Engineering Institute (Technical University). Currently Ruslan V. Belyankin works as a principal engineer in Private Joint Stock Company “Gazmashproekt”. He is the author of over 20 publications in field of digital signal processing and measurement system engineering.
Vladimir Arnoldovich VINOKUROV was born in 1950. In 1972 graduated from Gubkin Moscow Institute of Oil and Gas Industry (now Gubkin Russian State University of Oil and Gas). Doctor of Chemistry Sci., professor, Head of Physical and Colloidal Chemistry Chair of Gubkin Russian State University of Oil and Gas. He is the author of 250 publications. Е-mail: vinok_ac@mail.ru

Abstract: The objective of this research is to increase sensitivity and selectivity in environment control gas detection and investigation of deposits of hydrocarbonic minerals development by use of adsorption-desorption flicker-noise spectroscopy (FNS) for high-ohmic semiconductor gas sensors, and by enhanced adsorption in the gas-sensing surface of the gas sensor. Methods The proposed solution presupposes measurement of the sensing surface electrical characteristics (simultaneously or successively) when the measurement chamber is being filled with the gas under analysis with temperature of the sensor and pressure of the chamber changing, and when the sensor is exposed to pulsating monochrome light. The exposure to temperature or pressure changes or radiation must be significantly lower than the time of measurement. Spectrum deviations from 1/f expression in each discrete measurement interval (0.2 Hz) within the range of 0.1 to 10 Hz are proposed to be used as low-frequency flicker noise spectrum identifiers, on the presumption that the cause of these deviations are electrical effects induced by adsorption in the gas sensor surface. These deviations are described by expression 1/fγ (where γ < 1). The contents analysis is carried out by comparing the gas-sensing surface flicker noise spectra under adsorption with the gas-sensing surface flicker noise spectra when the sensor is free from any influence. The identifiers will be values of the derivatives of the flicker noise functions in the interval between break frequencies of flicker noise. The gas content is defined through the array of these values.

Index UDK: 621.382