Selfnoise Reduction in Acoustic Measurements with a Particle Velocity Sensor by Means of a Cross-Correlation Technique


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Honschoten van, J.W. and Druyvesteyn, W.F. and Raangs, R. and Krijnen, G.J.M. and Elwenspoek, M.C. (2002) Selfnoise Reduction in Acoustic Measurements with a Particle Velocity Sensor by Means of a Cross-Correlation Technique. In: Forum Acusticum, September 16-20, 2002, Sevilla, Spain.

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Abstract:The Microflown is a thermal acoustic sensor which does not measure sound pressure but the accompanying particle velocity (see [1-5]). This particle velocity is deduced from a temperature difference between two heated wires. A drawback is the sensor’s lower signal-to-noise (S/N-) ratio at higher frequencies compared to pressure microphones. A method is presented to reduce the noise by utilisation of cross- instead of auto-correlation spectra of two Microflowns. Dependent on the number of data points used, improvements of the signal-to-noise-ratio as high as 30 dB have be attained. The bandwidth in which the sensor’s noise characteristics are comparable to those of current microphones, thus increases from about.
Item Type:Conference or Workshop Item
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Electrical Engineering, Mathematics and Computer Science (EEMCS)
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Link to this item:http://purl.utwente.nl/publications/43138
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