Bioluminescence-based imaging technique to measure fluid stresses

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The dinoflagellate Pyrocystis lunula emits light in response to water motion. The statistical features of the bioluminescence, emitted by P. lunula, owing to dynamic impact pressure and shear stress in oscillatory boundary layer flows over ripped bed were studied with the aim to develop a new imaging technique for measuring fluid stresses, pressure and shear, using plankton that emit light in response to mechanical stimulation. Since the flash intensity correlated with the both impact pressure and fluid strain rate, the instantaneous planar distribution of the fluid stresses can be estimated from video images of the bioluminescence in a fluid region by using the empirical relation determined in this study.