US 2022/0089941 A1 · Fluorescent Particles, Inspection Device Using Fluorescent Particles For Visualizing and Inspecting Motion/Movement Of Fluid In Locations Where Fluid Is Present, And Inspection Method Using Fluorescent Particles For Visualizing and Inspecting Motion/Movement Of Fluid In Locations Where Fluid Is Present

Abstract

[Problem] To provide: fluorescent particles that are used to create a fluorescent material for coating an object in the vicinity of a fluid, that move regularly in the fluid while suppressing halation generated by the objects, and that enable the motion/movement of the fluid to be sharply visualized; an inspection device; and an inspection method. [Solution] Substantially spherical fluorescent particles comprising a mixture containing at least one fluorescent material and a synthetic resin, wherein: the fluorescent material is excited by any purple visible light and UV rays having a wave-length of 290-405 nm, and emits visible light having a peak wavelength within the range of 410-620 nm; and the fluorescent particles have diameters of 100 nm to 1 mm and are distinguishable from bubbles and/or foreign bodies in the fluid when irradiated with the light.

Claims19

Dependent claims

Fluorescent particles comprising mixture including at least one fluorescent substance and a synthetic resin,

wherein said fluorescent particles are characterized in that the fluorescent substance emits visible lights having a peak wavelength within a range of 410 nm-620 nm when irradiated by ultraviolet light have a wavelength of 290 nm-405 nm,
wherein said synthetic resin is a thermosetting resin or a thermoplastic resin,
wherein the fluorescent particles are spherically shaped with a particle diameter of 10 nm-1 mm, and
wherein said fluorescent substance comprises any one or more compound selected from the group consisting of europium-based compounds that emit red lights having any one of following chemical formulae 1 to 5, naphthalene-based compounds that emit blue lights having chemical formula 6, terbium-based compounds that emit green lights having chemical formula 7 or 8, and quinoline-based compounds that emit green lights shown by a following having chemical formula 9, wherein

1 more element

A method for visualizing and inspecting fluid motion in locations where fluid is present, comprising steps of:

(A) blending fluorescent particles into locations where fluid is present;
(B) irradiating said the fluid containing said blended fluorescent particles with ultraviolet light having a wavelength of 290 nm-405 nm;
and
(C) observing visible lights emitted from said fluorescent particles.

1 more element

Dependencies are inferred from the claim text.

Life of this patent

Life of this patent

Abstract

Claims19