Abstract
Full-field luminescent pressure sensors are commonly referred to as Pressure Sensitive Paint (PSP). In this paper, the suitability of PSP for the detection of acoustic pressure fluctuations is evaluated. Single point measurements utilizing a photomultiplier tube are performed in an acoustic plane wave tube capable of generating pressure levels up to 164 dB SPL for frequencies from 500 to 2100 Hz. The PSP coating employed is platinum meso-tetra(pentafluorophenyl) porphrine [PtTFPP] in poly(tBS-co-TFEM). Comparisons between a 1/4″ Bru¨el & Kjær type 4138 condenser microphone and the PSP detection system are used to evaluate the PSP system in both the time and frequency domains. The frequency response and linearity of the optical system is established and the high frequency attenuation is characterized. Experimental characterization indicates a dc sensitivity of 5.68 μV/Pa, a noise floor of 127 dB SPL and a frequency response of −2.5 dB/octave and a 45° phase delay. PSP shows the ability to avoid saturation and nonlinearities at higher sound pressure levels.
Published Version
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