Index of content:
Volume 119, Issue 1, January 2006
- TRANSDUCTION 
119(2006); http://dx.doi.org/10.1121/1.2140935View Description Hide Description
Pressure-sensitive paint is presented and evaluated in this article as a quantitative technique for measurement of acoustic pressure fluctuations. This work is the culmination of advances in paint technology which enable unsteady measurements of fluctuations over at pressure levels as low as . Pressure-sensitive paint may be thought of as a nano-scale array of optical microphones with a spatial resolution limited primarily by the resolution of the imaging device. Thus, pressure-sensitive paint is a powerful tool for making high-amplitude sound pressuremeasurements. In this work, the paint was used to record ensemble-averaged, time-resolved, quantitative measurements of two-dimensional mode shapes in an acoustic resonance cavity. A wall-mounted speaker generated nonlinear, standing acoustic waves in a rigid enclosure measuring wide, high, and deep. The paint recorded the acoustic surface pressures of the (1,1,0) mode shape at and a sound pressure level of . Results from the paint are compared with data from a Kulite pressuretransducer, and with linear acoustic theory. The paint may be used as a diagnostic technique for ultrasonic tests where high spatial resolution is essential, or in nonlinear acoustic applications such as shock tubes.