# US 10,310,029 B2 · Method and device for measuring a magnetic field distribution of a magnet along a main surface of said magnet > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,310,029 B2 - Document ID: US10310029B2 - Status: Granted - Kind: B2 - Application number: 15/037,017 - Filed: 2015-03-31 - Published: 2017-02-09 - Granted: 2019-06-04 - Earliest claimed: 2014-04-11 - Assignees: Magcam NV - Applicants: MagCam NV - Inventors: Koen Vervaeke; Stephan Kliché - Web page: https://patentgrep.com/patent/US10310029B2 ## CPC - G01R 33/10: Plotting field distribution {; Measuring field distribution} - G01R 33/0094: {Sensor arrays} - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) ## Abstract A method for determining a magnetic field of a magnet along a surface of the magnet, the method comprising: performing a relative movement between the surface of the magnet and a magnetic camera device; measuring the magnetic field by means of the magnetic camera device, to thereby obtain magnetic field measurements for the surface; wherein the relative movement is a continuous movement which is a combination of a relative translational movement and a relative rotational movement; and apparatus. ## Claims ### Claim 1 A method for determining a magnetic field of a magnet along a disk surface of said magnet, the method comprising: performing a relative movement between said disk surface of said magnet and a magnetic camera device comprising a one-dimensional array of at least two magnetic field sensors arranged along a first direction; and measuring said magnetic field by means of said magnetic camera device, to thereby obtain magnetic field measurements for said disk surface of said magnet, wherein said relative movement is a continuous movement which is a combination of a relative translational movement parallel to said first direction and a relative rotational movement, wherein said relative translational movement is a movement along a radial direction of said disk surface of said magnet, wherein said relative rotational movement is a movement wherein said disk surface of said magnet rotates around an axis, said axis defining a second direction, and wherein said first direction and said second direction are perpendicular, resulting in a spiraling relative movement. ### Claim 2 (depends on 1) The method according to claim 1, wherein said full scan comprises scanning a portion of said disk surface more than once, at subsequent rotation cycles of said relative rotational movement. ### Claim 3 (depends on 1) The method according to claim 1, wherein measuring said magnetic field by means of said magnetic camera device is performed at predetermined instances in time. ### Claim 4 (depends on 3) The method according to claim 3, wherein said predetermined instances in time are separated by constant time intervals. ### Claim 5 (depends on 1) The method according claim 1, wherein a speed of said relative translational movement and an angular speed of said relative rotational movement are predetermined. ### Claim 6 (depends on 5) The method according to claim 5, wherein a speed of said relative translational movement and an angular speed of said relative rotational movement are constant. ### Claim 7 (depends on 1) The method according to claim 1, wherein said spiraling relative movement results in a full scan of the magnetic field along said disk surface. ### Claim 8 (depends on 1) The method according to claim 1, further comprising the step of: mapping associated positions or coordinates of said disk surface of said magnet to their respective magnetic field measurement. ### Claim 9 An apparatus for determining a magnetic field of a magnet along a disk surface of said magnet, the apparatus comprising: a means for performing a relative movement between said disk surface of said magnet and a magnetic camera device; and a magnetic camera device comprising a one-dimensional array of at least two magnetic field sensors arranged along a first direction, to thereby obtain magnetic field measurements for said disk surface, wherein said means for performing a relative movement is adapted for performing a relative movement which is a continuous movement which is a combination of a relative translational movement parallel to said first direction and a relative rotational movement, wherein said relative translational movement is a movement along a radial direction of said disk surface of said magnet, wherein said relative rotational movement is a movement wherein said disk surface of said magnet rotates around an axis, said axis defining a second direction, and wherein said first direction and said second direction are perpendicular, resulting in a spiraling relative movement. ### Claim 10 (depends on 9) The apparatus according to claim 9, wherein said spiraling relative movement results in a full scan of the magnetic field along said disk surface. ### Claim 11 (depends on 10) The apparatus according to claim 10, wherein said full scan comprises scanning a portion of said disk surface more than once, at subsequent rotation cycles of said relative rotational movement. ### Claim 12 (depends on 9) The apparatus according to claim 9, wherein measuring said magnetic field by means of said magnetic camera device is performed at predetermined instances in time. ### Claim 13 (depends on 12) The apparatus according to claim 12, wherein said predetermined instances in time are separated by constant time intervals. ### Claim 14 (depends on 9) The apparatus according to claim 9, wherein a speed of said relative translational movement and an angular speed of said relative rotational movement are predetermined. ### Claim 15 (depends on 9) The apparatus according to claim 9, wherein a speed of said relative translational movement and an angular speed of said relative rotational movement are constant. ### Claim 16 (depends on 9) The apparatus according to claim 9 further comprising means for mapping associated positions or coordinates of said disk surface of said magnet to their respective magnetic field measurement.