Step Response Characteristics of Polymer/Ceramic Pressure-Sensitive Paint

Area of Science:

• Aerospace Engineering
• Materials Science
• Optical Measurement Techniques

Background:

• Polymer/Ceramic Pressure-Sensitive Paint (PC-PSP) is a luminescent sensor used for pressure measurement.
• Understanding PC-PSP quenching kinetics is crucial for accurate aerodynamic testing.
• Existing models may not fully capture the dynamic response of PC-PSP.

Purpose of the Study:

• To investigate the step response characteristics of PC-PSP.
• To develop and validate an analytical model for PC-PSP quenching kinetics.
• To determine the influence of various parameters on PC-PSP response times.

Main Methods:

• Numerical simulations using a developed analytical model.
• Experimental validation in a shock tube environment.
• Parameter variation to match experimental data and predict response.

Main Results:

• Higher O₂ diffusion coefficients and light attenuation accelerate PC-PSP response.
• Longer ambient luminescence lifetimes and higher sensitivity slow down PC-PSP response.
• Response functions are non-linear and depend on pressure change magnitude and direction.

Conclusions:

• The analytical model accurately describes PC-PSP response, incorporating diffusion and luminescence lifetimes.
• Optimized model parameters provide insights into PC-PSP behavior under various conditions.
• The study enables estimation of response times for pressure decreases, previously unachievable experimentally.