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A photonic wall pressure sensor for fluid mechanics applications
The Review of Scientific Instruments
|November 7, 2012
Summary
This study presents a novel micro-optical wall pressure sensor using dielectric resonators. The sensor achieves high resolution and bandwidth for accurate pressure measurements in fluid dynamics applications.
Area of Science:
- Optical Engineering
- Micro-optics
- Fluid Mechanics
Background:
- Accurate wall pressure measurement is crucial for understanding fluid dynamics.
- Existing sensors may have limitations in resolution, bandwidth, or invasiveness.
Purpose of the Study:
- To demonstrate a micro-optical wall pressure sensor concept.
- To investigate the use of optical modes in dielectric resonators for pressure sensing.
- To evaluate the performance of prototype sensors.
Main Methods:
- Utilizing spherical dielectric micro-resonators as the sensing element.
- Employing a flush-mounted latex membrane to transmit normal pressure.
- Monitoring shifts in optical modes caused by pressure-induced morphological changes.
- Testing prototypes in a 2D channel flow and an acoustic tube.
Main Results:
- Demonstrated a sensor resolution of approximately 20 mPa.
- Achieved a sensor bandwidth of up to 2 kHz.
- Successfully correlated optical mode shifts with applied wall pressure.
Conclusions:
- The micro-optical resonator sensor concept is viable for wall pressure measurement.
- The sensor offers high resolution and sufficient bandwidth for dynamic flow studies.
- This technology has potential applications in aerodynamics and acoustics.
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