# US 11,906,545 B2 · Laser radar device, wind power generator, and wind measurement method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,906,545 B2 - Document ID: US11906545B2 - Status: Granted - Kind: B2 - Application number: 17/028,127 - Filed: 2020-09-22 - Published: 2021-01-07 - Granted: 2024-02-20 - Earliest claimed: 2018-04-26 - Assignees: Mitsubishi Electric Corporation - Applicants: Mitsubishi Electric Corporation - Inventors: Shumpei Kameyama; Nobuki Kotake; Yutaka Kajiyama - Web page: https://patentgrep.com/patent/US11906545B2 ## CPC - G01P 5/26: by measuring the direct influence of the streaming fluid on the properties of a detecting optical wave - G01S 17/58: Velocity or trajectory determination systems; Sense-of-movement determination systems - F03D 17/00: Monitoring or testing of wind motors, e.g. diagnostics (testing during commissioning of wind motors F03D13/30) - F03D 80/00: Details, components or accessories not provided for in groups F03D1/00 - F03D17/00 - G01S 7/487: Extracting wanted echo signals {, e.g. pulse detection} - G01S 17/95: for meteorological use - F05B 2270/8042: Lidar systems - Y02A 90/10: Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation - Y02E 10/72: Wind turbines with rotation axis in wind direction - 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}) - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES - F03D: WIND MOTORS - F05B: INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G - Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract A laser radar device calculates a wind speed for each of a plurality of divided sections obtained by dividing a trajectory drawn by a laser beam in front of a wind turbine. ## Claims ### Claim 1 A laser radar device for transmitting laser light ahead of a wind turbine and receiving scattered light of the laser light scattered at a transmission destination, the laser radar device being installed in a spinner portion of the wind turbine, the laser radar device comprising: processing circuitry to determine a divided section in which a laser beam of the laser light is present among a plurality of divided sections obtained by dividing a trajectory drawn by the laser beam in front of the wind turbine; per each divided section in which the laser beam is determined to be present, to analyze reception signals of the scattered light to calculate reception spectra for each distance in a line-of-sight direction of the laser beam, and integrate the calculated reception spectra; to store a reception spectrum calculated for each divided section; and to calculate a wind speed for each divided section using the reception spectrum for each divided section, wherein the trajectory drawn by the laser beam in front of the wind turbine is divided by the number of divisions for each distance in a line-of-sight direction of the laser beam, and the number of divisions of the trajectory is made smaller in a case where the distance in the line-of-sight direction of the laser beam is short than in a case where the distance is long. ### Claim 2 (depends on 1) The laser radar device according to claim 1, wherein the processing circuitry is further configured to determine whether or not a signal-to-noise ratio of the stored reception spectrum is larger than a threshold, to calculate a wind speed using a reception spectrum whose signal-to-noise ratio is determined to be larger than the threshold among reception spectra for respective divided sections stored, and to store a reception spectrum whose signal-to-noise ratio is determined to be equal to or smaller than the threshold, and integrate the calculated reception spectrum when the laser beam is present in a divided section corresponding to the stored reception spectrum with the stored reception spectrum until it is determined that the signal-to-noise ratio is larger than the threshold. ### Claim 3 (depends on 1) The laser radar device according to claim 1, wherein the processing circuitry is further configured to determine the divided section in which the laser beam is present among the plurality of divided sections obtained by dividing the trajectory drawn by the laser beam in front of the wind turbine with rotation of the wind turbine on a basis of rotation angle information of the wind turbine. ### Claim 4 (depends on 1) The laser radar device according to claim 1, wherein the processing circuitry is further configured to determine the divided section in which the laser beam is present among the plurality of divided sections obtained by dividing the trajectory drawn by the laser beam in front of the wind turbine with rotation of the wind turbine on a basis of rotation angle information and rotation speed information of the wind turbine. ### Claim 5 (depends on 1) The laser radar device according to claim 1, comprising a beam scanner for performing scanning with the laser beam in such a manner that the laser beam draws the trajectory in front of the wind turbine. ### Claim 6 (depends on 1) A wind power generator comprising the laser radar device according to claim 1. ### Claim 7 A laser radar device for transmitting laser light ahead of a wind turbine and receiving scattered light of the laser light scattered at a transmission destination, the laser radar device being installed in a spinner portion of the wind turbine, the laser radar device comprising: a jig holding the laser radar device inside the spinner portion and fixed to a nacelle portion of the wind turbine in such a manner that the laser radar device does not rotate together with the spinner portion; a beam scanner for performing scanning with a laser beam of the laser light not depending on rotation of the wind turbine; to determine a divided section in which the laser beam is present among a plurality of divided sections obtained by dividing a trajectory drawn in front of the wind turbine by the laser beam with which the beam scanner has performed scanning; per each divided section the laser beam is determined to be present, to analyze reception signals of the scattered light to calculate reception spectra for each distance in a line-of-sight direction of the laser beam, and integrate the calculated reception spectra; processing circuitry to store a reception spectrum calculated for each divided section; and to calculate a wind speed for each divided section using the reception spectrum for each divided section, wherein the trajectory drawn by the laser beam in front of the wind turbine is divided by the number of divisions for each distance in a line-of-sight direction of the laser beam, and the number of divisions of the trajectory is made smaller in a case where the distance in the line-of-sight direction of the laser beam is short than in a case where the distance is long. ### Claim 8 (depends on 7) A wind power generator comprising the laser radar device according to claim 7. ### Claim 9 A wind measurement method of a laser radar device for transmitting laser light ahead of a wind turbine and receiving scattered light of the laser light scattered at a transmission destination, the laser radar device being installed in a spinner portion of the wind turbine, the wind measurement method comprising: determining a divided section in which a laser beam of the laser light is present among a plurality of divided sections obtained by dividing a trajectory drawn by the laser beam in front of the wind turbine; per each divided section in which the laser beam is determined to be present, analyzing reception signals of the scattered light to calculate reception spectra for each distance in a line-of-sight direction of the laser beam, and integrating the calculated reception spectra; storing a reception spectrum calculated for each divided section; and calculating a wind speed for each divided section using the reception spectrum for each divided section, wherein the trajectory drawn by the laser beam in front of the wind turbine is divided by the number of divisions for each distance in a line-of-sight direction of the laser beam, and the number of divisions of the trajectory is made smaller in a case where the distance in the line-of-sight direction of the laser beam is short than in a case where the distance is long.