Differential luminescent imaging method for pressure field measurement. (January 2022)

• Record Type: Journal Article
• Authors: Hayashi, Tatsunori; Kurihara, Daiki; Sakaue, Hirotaka
• Is Part Of: Measurement. Volume 187(2022)
• Publication Date: 2022-01
• Subjects: Pressure-sensitive paint -- Differential luminescent imaging -- Acoustic field -- Pressure measurement; Weights and measures -- Periodicals; Measurement -- Periodicals; Measurement; Weights and measures; Periodicals; 530.8
• DOI: 10.1016/j.measurement.2021.110253
• Languages: English
• ISSNs: 0263-2241

Abstract

Highlights: Differential luminescent imaging using a PSP performed an acoustic measurement. The point-wise measurement system of the differential PSP method was developed. Differential PSP captured a quasi-steady pressure field with a 300 Pa pk-pk. Total pressure uncertainty of the differential PSP measurement system was analyzed. Abstract: A differential luminescent imaging method is applied to a pressure-sensitive paint (PSP) measurement to capture a quasi-steady acoustic pressure field. Conventionally, PSP measurements capture an absolute luminescent intensity and convert it to pressure. When the mean component of the absolute luminescent intensity occupies a substantial portion of the dynamic range of the image acquisition device, it leads to a coarse signal resolution. Differential luminescent imaging, utilizing two-color luminescent intensities and a differential amplifier, extracts the fluctuation component from the absolute luminescent intensity. The developed differential luminescent imaging system gives a point-wise pressure measurement. These measurements are combined to produce a spatially resolved image. It is capable of resolving the periodic pressure wave over the acoustic field where the resolution of a conventional PSP measurement falls into one digital count. This comparison to a conventional PSP measurement is given as a reference by which to evaluate the spatiotemporal resolution of the differential luminescent imaging method.