The Tracking Resonance Frequency Method for Photoacoustic Measurements Based on the Phase Response.

Autor:	Suchenek, Mariusz
Předmět:	PHOTOACOUSTIC effect FIELD programmable gate arrays GAS mixtures MICROCONTROLLERS CARBON dioxide injection
Zdroj:	International Journal of Thermophysics; Apr2017, Vol. 38 Issue 4, p1-8, 8p
Abstrakt:	One of the major issues in the use of the resonant photoacoustic cell is the resonance frequency of the cell. The frequency is not stable, and its changes depend mostly on temperature and gas mixture. This paper presents a new method for tracking resonance frequency, where both the amplitude and phase are calculated from the input samples. The stimulating frequency can be adjusted to the resonance frequency of the cell based on the phase. This method was implemented using a digital measurement system with an analog to digital converter, field programmable gate array (FPGA) and a microcontroller. The resonance frequency was changed by the injection of carbon dioxide into the cell. A theoretical description and experimental results are also presented. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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