Bioluminescence-based imaging technique to measure fluid stresses

甲藻Pyrocystis lunula在水运动时会发光。研究了裂床振荡边界层流动中新月形浮游生物在动态冲击压力和剪切应力作用下发光的统计特征，旨在发展一种利用发光浮游生物测量流体应力、压力和剪切应力的新成像技术。由于闪光强度与冲击压力和流体应变率相关，因此，利用本研究确定的经验关系，可以从流体区域中生物发光的视频图像中估计流体应力的瞬时平面分布。

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.