Title :
Bore reconstruction of tubular ducts from its acoustic input impedance curve
Author :
Kausel, Wilfried
Author_Institution :
Dept. of Musical Acoust., Music Univ., Vienna, Austria
Abstract :
In order to get accurate bore information of tubular objects from acoustical input impedance measurements an optimization approach is proposed and investigated. A suitable waveguide model is reviewed and reconstruction results are presented. Sensitivity of input impedance magnitude to bore variation indicates, that axial accuracy can be improved, without increasing the sampling rate. Advantages of the method are its increased numerical stability, its tolerance to white noise on top of measured data, no requirement to measure phase, and the fact, that measured data need not to be contiguous in the frequency domain. Frequency bands, which are difficult to measure, can be omitted.
Keywords :
acoustic impedance; electric conduits; acoustic input impedance curve; bore reconstruction; numerical stability; tubular duct; Acoustic waveguides; Boring; Ducts; Frequency measurement; Impedance measurement; Noise measurement; Numerical stability; Phase measurement; Sampling methods; White noise;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 2003. IMTC '03. Proceedings of the 20th IEEE
Print_ISBN :
0-7803-7705-2
DOI :
10.1109/IMTC.2003.1207901