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|1. (WO2018203429) FLOW VELOCITY MEASUREMENT METHOD, FLOW VELOCITY MEASUREMENT DEVICE, AND PROGRAM|
SONY SEMICONDUCTOR SOLUTIONS CORPORATION
|Title:||FLOW VELOCITY MEASUREMENT METHOD, FLOW VELOCITY MEASUREMENT DEVICE, AND PROGRAM|
[Problem] To measure flow velocity of a light-scattering fluid in a simple and fast manner. [Solution] The flow velocity measurement method according to the present invention comprises: generating two or more speckle images by successively photographing a light-scattering fluid which is the object to be measured, with an exposure time shorter than the spatial correlation disappearance time which is the time that it takes for spatial correlation of speckle patterns generated by the light-scattering fluid to disappear, at a time interval shorter than the spatial correlation disappearance time; and calculating the velocity and direction of the flow of the light-scattering fluid from temporal fluctuation of the speckle patterns between two or more of the speckle images, wherein photographing the speckle images is performed either by using an imaging device having a line sensor mounted therein or by using an imaging device having an area sensor mounted therein but using a portion of pixel groups of the area sensor.