Document Detail


Measurement of transient acoustic fields using a single-shot pressure-sensitive paint system.
MedLine Citation:
PMID:  21806232     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
A pressure-sensitive paint (PSP) system capable of measuring high-frequency acoustic fields with non-periodic, acoustic-level pressure changes is described. As an optical measurement technique, PSP provides the experimenter with a global distribution of pressure on a painted surface. To demonstrate frequency response and enhanced sensitivity to pressure changes, a PSP system consisting of a polymer∕ceramic matrix binder with platinum tetra(pentafluorophenyl) porphyrin (PtTFPP) as the oxygen probe was applied to a wall inside an acoustic resonance cavity excited at 1.3 kHz. A data acquisition technique based on the luminescent decay lifetime of the oxygen sensors excited by a single pulse of light afforded the ability to capture instantaneous pressure fields with no phase-averaging. Superimposed wave-like structures were observed with a wavelength corresponding to a 4.7% difference from the theoretical value for a sound wave emanating from the speaker. High sound pressure cases upwards of 145 dB (re 20 μPa) exhibited skewed nodal lines attributed to a nonlinear acoustic field. The lowest sound pressure level of 125.4 dB-corresponding to an amplitude of 52.7 Pa, or approximately 0.05% of standard sea-level atmospheric pressure-showed that the paint could resolve the spatial details of the mode shape at the given resonance condition.
Authors:
Kevin J Disotell; James W Gregory
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Review of scientific instruments     Volume:  82     ISSN:  1089-7623     ISO Abbreviation:  Rev Sci Instrum     Publication Date:  2011 Jul 
Date Detail:
Created Date:  2011-08-02     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0405571     Medline TA:  Rev Sci Instrum     Country:  United States    
Other Details:
Languages:  eng     Pagination:  075112     Citation Subset:  IM    
Affiliation:
Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, Ohio 43235, USA.
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