Pressure is defined as force per unit area. Its SI unit is newton per square meter (also called Pascal, abbreviated as Pa). Therefore, force and pressure measurements are synonymous. Optical methods of pressure measurement include the deformation measurement of elastic members like diaphragm and cantilever, photoelastic method, acousto-optic effect, pressure sensitive paint, and pressure-dependent thickness change.
A typical pressure sensitive paint (PSP) consists of a luminescent molecule (luminophore) in an oxygen-permeable binder to physically adhere the luminophore to the surface of the test specimen. Pressure measurement with PSP depends on the sensitivity of the specific luminophore ...
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