Journal
REVIEW OF SCIENTIFIC INSTRUMENTS
Volume 83, Issue 10, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4757569
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Funding
- National Science Foundation (NSF) [CBET-0809240]
- (U.S.) Air Force Office of Scientific Research (USAFOSR) through STTR [FA 9550-10-C-0091]
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In this paper, we demonstrate a micro-optical wall pressure sensor concept based on the optical modes of dielectric resonators. The sensing element is a spherical micro-resonator with a diameter of a few hundred micrometers. A latex membrane that is flush mounted on the wall transmits the normal pressure to the sensing element. Changes in the wall pressure perturb the sphere's morphology, leading to a shift in the optical modes. The wall pressure is measured by monitoring the shifts in the optical modes. Prototype sensors with polydimethylsiloxane micro-spheres are tested in a steady two-dimensional channel flow and in a plane wave acoustic tube. Results indicate sensor resolutions of similar to 20 mPa and bandwidth of up to 2 kHz. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4757569]
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