# US 10,502,754 B2 · Apparatus for measuring fluid speed > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,502,754 B2 - Document ID: US10502754B2 - Status: Granted - Kind: B2 - Application number: 15/518,288 - Filed: 2015-06-24 - Published: 2017-10-26 - Granted: 2019-12-10 - Earliest claimed: 2014-12-22 - Assignees: INTEKBIO Co., LTD. - Applicants: INTEKBIO Co., LTD. - Inventors: Seok Chung; Jung Hyo Yoon; Eun Doo Lee; Se Woon Han; Jae Ho Kim; Young Kyu Cho; David Lim; Yong Hun Jung; Seung Hun Hong - Web page: https://patentgrep.com/patent/US10502754B2 ## CPC - G01P 5/26: by measuring the direct influence of the streaming fluid on the properties of a detecting optical wave - G01F 1/661: using light - G01F 1/7086: using optical detecting arrangements - G01P 5/18: by measuring the time taken to traverse a fixed distance - G01P 3/366: {by using diffraction of light (for measuring speed of fluids G01P5/26)} - G01P: MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT (measuring or recording blood flow A61B5/02, A61B8/06; monitoring speed or deceleration of electrically-propelled vehicles B60L3/00; vehicle lighting systems adapted to indicate speed B60Q1/54; determining position or course in navigation, measuring ground distance in geodesy or surveying G01C; combined measuring devices for measuring two or more variables of movement G01C23/00; measuring velocity of sound G01H; measuring velocity of light G01J7/00; measuring direction or velocity of solid objects by reception or emission of radiowaves or other waves and based on propagation effects, e.g. Doppler effect, propagation time, direction of propagation, G01S; measuring speed of nuclear radiation G01T; measuring acceleration of gravity G01V; {measuring or recording the speed of trains B61L23/00; speed indicators incorporated in motor vehicles B60K35/00; measuring frequency or phase G01R; traffic control G08G}) - G01F: MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME ## Abstract An apparatus for measuring fluid speed by using the refraction of light is disclosed. The apparatus includes: a channel in which a passage is formed to allow the flow of a fluid; a first and a second light source that are located in any one region of an upper part and a lower part of the channel; a sensor installed in an opposite region of the region where the first and second light sources are located with respect to the channel, to receive the light emitted from the first and second light sources; a speed calculation unit configured to calculate a speed of the fluid by using the intensity of the light received at the sensor. ## Claims ### Claim 1 An apparatus for measuring fluid speed, the apparatus comprising: a channel having a passage formed therein for holding a fluid flowing therethrough; a first light source and a second light source located in any one region of an upper part and a lower part of the channel; a sensor installed in an opposite region of the region where the first light source and the second light source are located with respect to the channel, the sensor configured to receive light emitted from the first light source and the second light source; and a speed calculation unit configured to calculate a speed of the fluid by using an intensity of light received at the sensor, wherein the speed calculation unit calculates the speed of the fluid by using a time point at which the intensity of the light changes and distance information regarding a distance between a first incident point and a second incident point, the first incident point being a point where the light emitted from the first light source meets the channel, and the second incident point being a point where the light emitted from the second light source meets the channel, wherein an angle of the first light source and the second light source with respect to the channel is adjustable. ### Claim 2 (depends on 1) The apparatus for measuring fluid speed of claim 1, wherein a size of the sensor is determined based on a distance between the channel and the sensor. ### Claim 3 (depends on 1) The apparatus for measuring fluid speed of claim 1, wherein the first light source and the second light source are positioned such that light is not incident a perpendicular angle with respect to a direction of a flow of the fluid formed in the channel. ### Claim 4 (depends on 1) The apparatus for measuring fluid speed of claim 1, wherein the first light source and the second light source are positioned such that light emitted from the first light source and light emitted from the second light source are not parallel with each other. ### Claim 5 (depends on 4) The apparatus for measuring fluid speed of claim 4, wherein light emitted from the first light source and light emitted from the second light source are received at the sensor after intersecting in the opposite region.