Dual-Accelerometer Rotation Measurement Module
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Solution Overview
Problem
Traditional three-axis accelerometers in portable devices cannot accurately measure rotational angle changes unrelated to gravitational force, leading to user inconvenience, and integrating additional components like gyroscopes increases device volume, cost, and complexity.
Innovation Solution
A method and module using two sensors, one at each location, to measure centripetal and tangential accelerations, with a processor calculating angular velocity and rotational angle using specific equations, allowing for horizontal rotation measurement without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single three-axis accelerometer is used to detect rotation, then the device structure is simple, but it cannot measure rotational angle changes in horizontal direction
Solution Approach 1:
The patent divides the measurement task into two separate sensors: one accelerometer to measure gravitational acceleration and another to measure centrifugal acceleration. This segmentation allows each sensor to specialize in detecting specific acceleration components, enabling comprehensive rotation measurement without requiring complex single-sensor solutions.
Solution Approach 2:
The patent makes the accelerometer serve multiple functions by using it in a dual-sensor configuration where both gravitational and centrifugal accelerations are measured. This multi-functional approach allows the system to detect both vertical and horizontal rotation components, expanding the measurement capability beyond what a single accelerometer can achieve.
2Measurement precision
If gyroscope or digital compass is integrated to detect horizontal rotation, then rotation measurement capability is improved, but device volume, manufacturing cost and calculation complexity increase
Solution Approach 1:
Instead of using expensive and bulky gyroscopes, the patent creates a functional copy by using a second accelerometer to measure centrifugal acceleration. This copy approach replicates the rotation detection capability using simpler, more cost-effective components that are already present in portable devices.
Solution Approach 2:
The patent replaces the mechanical gyroscope system with an acceleration-based measurement system using two accelerometers. This substitution eliminates the need for complex mechanical structures and expensive components, achieving the same rotation detection function through simpler mechanical acceleration sensing.
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
Enables accurate measurement of horizontal rotation with reduced error, integrating into portable devices with advantages of small volume, low cost, and low computational complexity compared to prior art.
Implementation Method 1
A first sensor is installed at the first location of the target object so as to sense the first centripetal acceleration and the first tangential acceleration while the target object is rotating
Implementation Method 2
A first sensor is installed at the first location of the target object so as to sense the first centripetal acceleration and the first tangential acceleration while the target object is rotating
Implementation Method 3
A second sensor is installed at the second location of the target object so as to sense the second centrifugal acceleration and the second tangential acceleration while the target object is rotating
Implementation Method 4
A second sensor is installed at the second location of the target object so as to sense the second centrifugal acceleration and the second tangential acceleration while the target object is rotating
Data Source
AI summary
The invention discloses a method and a module for measuring rotation and a portable apparatus comprising said module. The module of the present invention is adapted for measuring rotation of a target, and the module includes a first sensor, a second sensor and a processor. The first sensor is disposed at a first location of the target, for sensing a first centripetal acceleration and a first tangential acceleration when the target is rotated. The second sensor is disposed at a second location of the target, for sensing a second centripetal acceleration and a second tangential acceleration when the target is rotated. The processor is coupled to the first sensor and the second sensor, for receiving the first centripetal acceleration and the first tangential acceleration from the first sensor, receiving the second centripetal acceleration and the second tangential acceleration from the second sensor, and calculating the rotation angle of the target accordingly.