Calibrating a magnetic sensor

A magnetic sensor and calibration system technology, applied in the direction of instruments, measuring magnetic variables, electromagnetic measuring devices, etc., can solve problems such as incorrect calibration, wrong position of sensors or transmitters, etc., to speed up calibration and testing, and simplify the calibration process Effect

Pending Publication Date: 2019-07-26
ASCENSION TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

Incorrect calibration of the transmitter relative to the sensor (incorrect calibration of the sensor relat

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  • Calibrating a magnetic sensor
  • Calibrating a magnetic sensor
  • Calibrating a magnetic sensor

Examples

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Example Embodiment

[0040] Electromagnetic tracking (EMT) systems can be used in gaming and / or surgical settings to track devices (eg, game controllers, head-mounted displays, medical equipment, robotic arms, etc.), allowing users of the system to know their respective three-dimensional positions And orientation. Augmented reality (AR) and virtual reality (VR) systems also use EMT systems to perform, for example, head, hand, and body tracking to synchronize the user's movement with AR / VR content. This system uses a magnetic transmitter close to the magnetic sensor to determine the position and / or orientation of the sensor relative to the transmitter. The transmitter and sensor used in this system are calibrated to ensure that the transmitter and sensor can provide users with accurate position and orientation information. If the sensor or transmitter is not calibrated or not properly calibrated, it can significantly reduce accuracy.

[0041] The calibration of the magnetic sensor may be performed b...

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Abstract

A calibration system comprising: a Helmholtz device comprising thee pairs of coils defining an inner volume, wherein each of the three pairs of coils is configured to generate a magnetic field that isuniform throughout the inner volume; a mount configured to accept a device that includes a magnetic sensor, wherein at least a portion of the mount is positioned within the inner volume such that themagnetic sensor is positioned at or near a center of the inner volume when the device is positioned on the mount; and a computer system configured to communicate with the Helmholtz device and the magnetic sensor, wherein the computer system is configured to: provide instructions to cause each of the three pairs of coils to generate a magnetic field; receive signals from the magnetic sensor that are based on characteristics of the magnetic fields received at the magnetic sensor; measure, based on the signals received from the magnetic sensor, one or more characteristics of the magnetic sensor;and determine, using a calibration algorithm, one or more calibration correction factors for the magnetic sensor based on the one or more characteristics of the magnetic sensor and the provided instructions.

Description

[0001] priority statement [0002] This application claims priority under 35 USC § 119(e) to US Patent Application Serial No. 62 / 619,232, filed January 19, 2018, the entire contents of which are incorporated herein by reference. technical field [0003] This disclosure relates to calibrating magnetic sensors. Background technique [0004] Electromagnetic tracking (EMT) systems in general, and augmented reality (AR) and virtual reality (VR) systems in particular, can determine the location of a device in various contexts (eg, gaming, medical, etc.). Such systems utilize a magnetic transmitter close to the magnetic sensor so that the sensor and transmitter can be spatially positioned relative to each other. Incorrect calibration of the transmitter relative to the sensor (incorrect calibration of the sensor relative to the transmitter) can cause the EMT system to report the wrong location of the sensor or transmitter. Contents of the invention [0005] Calibration of the ma...

Claims

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Application Information

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IPC IPC(8): G01R35/00
CPCG01R35/005G06F3/012G06F3/017G01C17/38G01R33/0035G01B7/003G01B21/042G06F3/011A61B2034/2051A61B2017/00725A61B2090/372A61B2090/502G01R33/0017H04N13/332G01B7/004G06F3/0346
Inventor 马克·罗伯特·施奈德查尔斯·罗伯特森
Owner ASCENSION TECH
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