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Updated: Feb 5, 2026

Synthesis and Microdiffraction at Extreme Pressures and Temperatures
Published on: October 7, 2013
Integration of pressure-sensitive paint with persistent phosphor: A light-charged pressure-sensing system
Di Peng1, Zhe Zhong1, Tao Cai1
1Key Lab of Education Ministry for Power Machinery and Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China.
Abstract:
A novel pressure-sensitive paint has been developed by mixing phosphor Sr4Al14O25:Eu,Dy with pressure-sensitive luminophore PtTFPP in a polyethylene binder. The phosphor particles served as hosts for PtTFPP molecules while providing excitation light via their bright blue/green luminescence. The unique long afterglow of Sr4Al14O25:Eu,Dy allows the coating to be charged by a light source (UV-LED or even sunlight) in advance, and then the luminescent signals can be collected by using a color camera for pressure measurement (without an external light source). The persistent luminescence and the pressure-sensitive signal correspond to the green and red channels, respectively. The errors due to time-varying persistent luminescence can be removed by taking an intensity ratio between the two channels. The current formulation of this light-charged pressure-sensitive paint (LC-PSP) has been optimized for the maximum signal level. It showed similar pressure sensitivity to typical pressure-sensitive paints (PSPs), and its capability was demonstrated through a nitrogen jet impingement experiment. This light-charged PSP can be truly free of light source during measurement, which greatly simplifies the optical system and avoids errors due to the inconsistent illumination field, and thus provides a solution for PSP applications in facilities with limited optical access.
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