Structured light illumination for pressure-sensitive paint measurement under ambient light

Area of Science:

• Optical Measurement Techniques
• Fluid Dynamics Instrumentation
• Surface Pressure Mapping

Background:

• Conventional pressure-sensitive paint (PSP) methods struggle with ambient light interference, leading to measurement errors.
• Accurate pressure measurement is crucial in various engineering and scientific applications.
• Existing PSP techniques often require controlled lighting conditions, limiting their field applicability.

Purpose of the Study:

• To develop and validate a PSP method capable of accurate pressure measurement under ambient light conditions.
• To overcome the limitations of conventional PSP methods caused by ambient light.
• To demonstrate the efficacy of structured light illumination for enhanced PSP performance.

Main Methods:

• Implementation of a novel PSP technique utilizing structured light illumination.
• Employing a digital mirror device to generate a sinusoidal structured light pattern.
• Synchronizing PSP emission measurements with the dynamic structured light patterns to filter out ambient light.

Main Results:

• Successful demonstration of pressure measurement under significant ambient light.
• Elimination of ambient light interference through synchronized structured light illumination.
• Validation of the proposed method by comparing results with a conventional pressure transducer, showing good agreement.

Conclusions:

• The proposed structured light illumination PSP method effectively mitigates ambient light effects.
• This innovative approach offers a promising solution for accurate pressure-sensitive paint measurements in real-world, non-ideal lighting conditions.
• The technique enhances the robustness and applicability of PSP for various aerodynamic and structural testing scenarios.