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Sensitivity Enhancement of Soft Capacitive Pressure Sensors Using a Solvent Evaporation-Based Porosity Control Technique

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Practical Fast-Response Anodized-Aluminum Pressure-Sensitive Paint Using Chemical Adsorption Luminophore as Optical

Yoshinori Oka¹, Takayuki Nagata¹, Miku Kasai¹

¹Department of Aerospace Engineering, Graduate School of Engineering, Tohoku University, 6-6-01 Aramakiaza-Aoba, Aoba-ku, Sendai 980-8579, Japan.

Sensors (Basel, Switzerland)

|September 9, 2022

Summary

Researchers developed a new anodized-aluminum pressure-sensitive paint (AA-PSP) using H2TCPP for optical unsteady pressure sensing. This advanced AA-PSP offers high sensitivity and low temperature dependence, suitable for dynamic pressure measurements.

Keywords:

H2TCPP anodized aluminum chemical adsorption fast responsiveness pressure-sensitive paint

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Area of Science:

Materials Science
Optical Sensors
Fluid Dynamics

Background:

Optical unsteady pressure sensors are crucial for aerodynamic and hydrodynamic applications.
Existing pressure-sensitive paints (PSPs) face limitations in response time and photostability.
Developing novel PSPs with enhanced performance is essential for advanced flow diagnostics.

Purpose of the Study:

To develop and evaluate a novel anodized-aluminum pressure-sensitive paint (AA-PSP) utilizing free-base porphyrin (H2TCPP).
To characterize the optical and sensing properties of the new AA-PSP for unsteady pressure measurements.
To assess the performance of the AA-PSP under dynamic conditions.

Main Methods:

Synthesis and formulation of AA-PSP with H2TCPP luminophore.
Characterization of photophysical properties, including fluorescence lifetime and excitation wavelengths.
Evaluation of pressure and temperature sensitivity through controlled experiments.
Assessment of photodegradation under different light sources.
Dynamic response testing using resonance tube and shock tube experiments.

Main Results:

The developed AA-PSP exhibits high pressure sensitivity (0.33-0.51%/kPa) and low temperature sensitivity (0.07-1.46%/K).
H2TCPP luminophore shows suitable excitation wavelengths (425 nm and >520 nm) and a short fluorescence lifetime (2.4 ns).
The AA-PSP demonstrates good photostability under green LED and Nd:YAG laser excitation.
Dynamic tests reveal a cut-off frequency exceeding 9.0 kHz and a time constant of approximately 10 µs for normal shock waves.

Conclusions:

The novel AA-PSP formulation with H2TCPP is a promising optical sensor for unsteady pressure measurements.
The paint offers excellent sensitivity, low temperature influence, and rapid response times.
Its robust performance makes it suitable for demanding applications in fluid dynamics and aerospace.