Abstract
Optical measurements of high-frequency pressure fluctuations have been performedto examine the dynamic response of a fast-responding porous pressure-sensitivepaint (PSP). The PSP was composed of meso-tetra(pentafluorophenyl) porphineand a commercial silica-gel thin-layer chromatography plate. Pressure fluctuationsat frequencies on the order of kilohertz were produced on a flat plate by choppingan underexpanded air-jet and then measured by using a newly developed,optical pressure measurement system (OPMS) with a Cassegrain-typeoptical probe. Pressure traces obtained by the present OPMS and theiramplitude spectra were compared with those obtained by a piezo-resistivepressure transducer. The present results demonstrate the feasibility of thepresent OPMS for measuring high-frequency pressure fluctuations witha high spatial resolution and reveal that the present porous PSP canfollow pressure fluctuations at frequencies of several kilohertz at least.
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