Calibrating High-Gravity Accelerometers Using Low-G Reference Sensors
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Solution Overview
Problem
High gravity accelerometers in sports equipment, such as golf clubs, suffer from significant measurement errors due to their high top measurement limits, leading to inaccuracies in simulating swing traces, which existing calibration methods fail to adequately address.
Innovation Solution
A calibration method that utilizes a low gravity accelerometer to estimate and calculate calibration parameters for a high gravity accelerometer, allowing for simplified and automated calibration without requiring precise alignment or movement of the high gravity accelerometer, using a combination of measurements in a Cartesian coordinate system and formulas to correct for errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If high gravity accelerometers are used to measure high acceleration values, then the measurement range is improved, but the measurement precision deteriorates
Solution Approach 1:
A low gravity accelerometer is introduced as an intermediary device to assist in calibrating the high gravity accelerometer. The low gravity accelerometer provides precise reference measurements during calibration, enabling the high gravity accelerometer to achieve accurate calibration across its full measurement range without suffering from inherent precision limitations at high measurement limits.
2Measurement precision
If traditional calibration methods are used for high gravity accelerometers, then calibration can be performed, but the calibration process complexity increases
Solution Approach 1:
The calibration system performs self-calibration by utilizing the low gravity accelerometer already present in the sports equipment. The system automatically compares measurements from both accelerometers and calculates calibration parameters without requiring external calibration equipment or complex manual procedures, thereby reducing calibration process complexity while maintaining accuracy.
Solution Approach 2:
The low gravity accelerometer serves multiple functions: it acts as both a normal measurement device for low gravity applications and as a reference standard for calibrating the high gravity accelerometer. This multi-functionality eliminates the need for separate calibration equipment, simplifying the overall system while improving calibration accuracy.
3Measurement precision
If precise alignment and multiple movements are required for calibration, then calibration accuracy can be maintained, but the ease of operation deteriorates
Solution Approach 1:
The patent replaces complex mechanical alignment procedures with computational methods. Instead of requiring precise physical alignment and multiple manual movements, the system uses mathematical algorithms to calculate calibration parameters based on measurements taken in arbitrary orientations. This substitution of mechanical procedures with computational processing dramatically improves ease of operation while maintaining calibration accuracy.
Data Source
AI summary
A calibration method for a first accelerometer is disclosed. The first accelerometer is installed together with a second accelerometer in a device. The calibration method includes the second accelerometer measuring a first set of X, Y, Z accelerations in a Cartesian coordinate system, the first accelerometer measuring a second set of X, Y, Z accelerations in the Cartesian coordinate system, indicating to rotate the device, the second accelerometer measuring a third set of X, Y, Z accelerations in the Cartesian coordinate system, the first accelerometer measuring a fourth set of X, Y, Z accelerations in the Cartesian coordinate system, and calibrating X, Y, Z acceleration values measured by the first accelerometer based on the first, second, third and fourth sets of X, Y, Z accelerations.