Accelerometer Array Radius of Rotation Detection
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Solution Overview
Problem
Existing motion sensor systems using accelerometers face challenges in accurately detecting the radius of rotation and motion variables due to interference from gravitational forces and external motions, requiring complex calculations and high processing power, which can lead to latency and inaccuracies in real-time applications.
Innovation Solution
A system utilizing two or more identical accelerometers with aligned sensitivity axes, where the difference in readings eliminates gravitational and external interference, allowing for the computation of motion variables, including radius of rotation, using geometrical principles and simplified calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex mathematical integration calculations are used to derive angular and linear velocity and position, then measurement precision is improved, but device complexity and processing power requirements increase
Solution Approach 1:
The patent extracts and eliminates gravitational force interference from accelerometer readings by using a differential measurement approach. Multiple accelerometers are positioned at different locations, and the gravitational component is removed by calculating differences between readings, thereby obtaining pure motion data without complex orientation tracking.
Solution Approach 2:
The patent replaces complex mathematical integration calculations with a geometric approach using differential accelerometer readings. Instead of performing time-based integration to derive motion variables, the system uses spatial differences between accelerometer outputs to directly compute angular and linear motion parameters.
2Measurement precision
If continuous tracking of device orientation is performed to filter gravitational force interference, then measurement precision is improved, but loss of time increases due to calculation latency
Solution Approach 1:
The patent performs preliminary action by pre-positioning multiple accelerometers at specific spatial relationships before motion occurs. This geometric arrangement is designed in advance so that when motion happens, the differential readings automatically eliminate gravity without requiring real-time orientation tracking or complex calculations.
Solution Approach 2:
The patent extracts gravitational interference from the measurement process by using differential accelerometer readings. Instead of tracking orientation continuously to compensate for gravity, the system removes gravitational components through the geometric relationship between multiple sensor positions, thereby eliminating the need for time-consuming orientation tracking.
3Measurement precision
If multiple accelerometers are used to detect motion components, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent makes the accelerometer arrangement universal by positioning multiple sensors at specific geometric relationships that enable them to simultaneously measure multiple motion components. The same set of accelerometers can detect both angular and linear motion, as well as filter gravitational effects, without requiring separate specialized sensors for each function.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces processing power requirements, minimizes latency, and accurately filters out interfering forces, enabling real-time and accurate detection of motion variables without tracking device orientation, thus improving the reliability of motion sensing in handheld devices and other applications.
Implementation Method 1
The motion can be detected in relevance to an external or internal reference point. This invention utilizes accelerometers, a motion sensor which relies on inertia of a suspended proof mass as a reference.
Data Source
AI summary
An apparatus having an arrangement of two or more identical accelerometers with aligned sensitivity axes. Each of the accelerometers senses motion over at least one axis. The accelerometer readings include a component corresponding to gravitational force that is the same for each accelerometer in the arrangement. Logic circuitry in communication with the accelerometer arrangement couples accelerometer signals to a processor to compute motion variables.