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The Failure of the Cross Correlation Measurement Technique
Department of Chemistry, Physics, and Astronomy, Georgia College and State University, Milledgeville, GA, USA
Department of Chemistry, Physics, and Astronomy, Georgia College and State University, Milledgeville, GA, USA
Department of Chemistry, Physics, and Astronomy, Georgia College and State University, Milledgeville, GA, USA
- 1 Department of Chemistry, Physics, and Astronomy, Georgia College and State University, Milledgeville, GA, USA
- 2 Department of Chemistry, Physics, and Astronomy, Georgia College and State University, Milledgeville, GA, USA
- 3 Department of Chemistry, Physics, and Astronomy, Georgia College and State University, Milledgeville, GA, USA
Open Journal of Acoustics·Volume 05 (2015)·Pages 25–28·Published 5 March 2015·DOI10.4236/oja.2015.51003
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Abstract
The experiment involves creating a sound wave that propagates down a pipe with 8 transducers attached at equally spaced intervals of 0.01016 m. The numerical method—the Cross Correlation Method, used to solve for the phase component, creates a high correlation value, but the speed of sound varies immensely. The method involves a Fast Fourier Transform (FFT) of the collected data, which is used to find the phase of the sound wave, and the slope of the position versus time graph, which is used to calculate the speed of sound. This high correlation value shows that the data are correct, but the numerical method for analyzing the data is incorrect.
KeywordsAcoustic ArrayCross CorrelationFlow Measurement
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