XX IMEKO World Congress
نویسندگان
چکیده
The interaction between ultrasonic waves and biological tissues is the cause of cavitation phenomena. A primary scope of this paper was to set-up a measurement system for the generation of cavitation by means of forcing a low frequency (20 kHz). From the spectra and power density was evident the presence of the random component associated to the noise of cavitation was evident. For the estimate of this component the technique ARMA spectral was particularly effective. The average lifetime of transient cavitation bubbles estimated from the time constant via the ARMA spectrum, was found to be in agreement with the data in the literature.
منابع مشابه
XVII IMEKO World Congress
The main goal of this paper is to characterize the low-frequency part of ADC transfer function by dual tone testing from intermodulation components that are independent of test signal harmonic distortion. The theoretical analyses of incoherently sampled signals in the frequency domain and of intermodulation distortion are provided and the theory is verified by experimental results.
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After an introduction to the mathematical theory of rheolinear systems the application of the results leads to the fact that due to the synchronization there arises a frequency deviation even outside of the synchronization range. The errors caused by this effect were investigated and consequences for highprecision frequency or time measurement and methods of error-correcting are obtained .
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The paper describes theoretical design and simulation results of the high precision amplifier for use in metrology especially for measurement of low AC voltage in a wide frequency range. The whole device will be used in process of calibration of common multimeters with AC/DC comparation technique.
متن کاملXVIII IMEKO WORLD CONGRESS Metrology for a Sustainable Development September, 17 – 22, 2006, Rio de Janeiro, Brazil UNCERTAINTY OF ESTIMATES OBTAINED WITH THE HISTOGRAM TEST OF ADCS
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متن کاملXIX IMEKO World Congress
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