| 摘要 |
PROBLEM TO BE SOLVED: To provide a particle image flow velocity measuring device not damaging followability of tracer particles to a flow field, capable of enhancing measurement accuracy, while avoiding an adverse effect on health of a human body.SOLUTION: Tracer particles included in a flow field in the periphery of an object are irradiated with laser light having a prescribed wavelength, and reflected light is imaged by an imaging means, and flow velocity in the flow field is measured based on the acquired image of the tracer particles. In this case, a fluorescent paint film 33 of the object is excited by the laser light to generate fluorescence having a wavelength different from the wavelength of the laser light. Accordingly, imaging is performed by a CCD camera 32A by using a filter 34 allowing passage of only a wavelength of reflected light acquired by reflection of the laser light by the tracer particles, thus the S/N ratio of the image of the tracer particles is enhanced and an effect of reflected light of the object is removed, thereby enhancing accuracy of measurement of the flow velocity. Further, fluorescence is not required to be given to the tracer particles, so that the weight of the tracer particles is not increased to prevent followability from being lowered, and the tracer particles including a harmful fluorescent material do not diffused to prevent the adverse effect from being exerted on the human body. |
