FLUID MEASUREMENT METHOD, FLUID MEASUREMENT DEVICE, FLUID MEASURING DATA GENERATION METHOD, FLUID MEASURING DATA GENERATION DEVICE AND COMPUTER PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a fluid measurement device which can directly calculate a depth variation amount and is improved in accuracy.SOLUTION: A fluid measurement device 1 comprises: an extraction part 11 which extracts a first particle image at the first time point and a second particle image at the second time point, to be measurement objects, from the first image and second image obtained by imaging particles by using the same camera at the first time point t and the second time point (t+Δt) after the elapse of minute time Δt from the first time point t; a Fourier transformation part 12 which performs Fourier transformation of the first particle image and the second particle image; an evaluation value calculation part 13 which calculates an evaluation value ΔD corresponding to a division value of image blur components included in each particle image by using at least one frequency component of the plurality of frequency components obtained in Fourier transformation and setting the division value of the value of the first particle image with respect to the value of the second particle image subjected to the Fourier transformation as one of input values of an operational expression; and a depth variation amount specification part 15 which specifies a depth variation amount Δz corresponding to the calculated evaluation value ΔD by referring to fluid measuring data 14a in which a known depth variation amount and evaluation value are associated with each other in advance.SELECTED DRAWING: Figure 1