Optical Positioning Calibration for Multi-Axis Sensor Crosstalk
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Solution Overview
Problem
Conventional optical systems with movable and fixed parts face challenges in achieving accurate measurement and positioning due to crosstalk effects when the movable part moves in multiple dimensions simultaneously, leading to difficulties in precise displacement and angular positioning.
Innovation Solution
The optical system incorporates a driving assembly, first and second sensors, and a control unit to detect and calibrate magnetic field variations from magnetic elements with different polar directions, generating error curves to reduce crosstalk and achieve precise position control by transmitting driving signals to the assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If magnetic elements and sensors are disposed on movable and fixed parts to detect displacement in multiple dimensions, then the optical system can measure movement in different dimensions, but crosstalk effects occur making accurate measurement and positioning difficult
Solution Approach 1:
The patent segments the measurement function by using multiple sensors with different polar directions (first sensor for first dimension, second sensor for second dimension). Each sensor is specialized to detect movement in a specific dimension, reducing crosstalk. The control unit processes signals from each sensor independently to calculate displacement in respective dimensions, achieving accurate multi-dimensional measurement without interference.
Solution Approach 2:
The patent applies local quality by configuring magnetic elements and sensors with specific polar directions at different locations. The first magnetic element has a first polar direction detected by the first sensor, while the second magnetic element has a second polar direction detected by the second sensor. This localized specialization of sensing capabilities allows each sensor to accurately measure displacement in its designated dimension without being affected by movement in other dimensions.
2Measurement precision
If multiple magnetic elements with different polar directions are used to detect movement in different dimensions, then multi-axis displacement detection is enabled, but crosstalk between dimensions occurs reducing measurement accuracy
Solution Approach 1:
The patent employs asymmetry by using magnetic elements with different polar directions (first polar direction for first magnetic element, second polar direction for second magnetic element) and corresponding sensors configured to detect specific dimensions. This asymmetric configuration ensures that each sensor primarily responds to movement in its designated dimension, minimizing crosstalk. The control unit processes these asymmetric sensor outputs to accurately determine displacement in each dimension independently.
3Loss of information
If sensors detect magnetic fields to determine displacement in multiple dimensions simultaneously, then comprehensive position information is obtained, but crosstalk effects make it difficult to achieve accurate positioning
Solution Approach 1:
The control unit implements feedback processing by receiving signals from both sensors, calculating displacement in the first dimension from the first sensor and displacement in the second dimension from the second sensor, and using this information to determine the current position of the movable part. This feedback mechanism ensures that position information from multiple dimensions is integrated accurately without crosstalk interference, maintaining both completeness and precision of position data.
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 solution enables accurate displacement and angular position measurement, reducing crosstalk effects and allowing for precise control of the movable part relative to the fixed part, thereby enhancing the optical system's positioning accuracy.
Implementation Method 1
The first sensor generates a first sensing value by detecting the movement of the movable part relative to the fixed part in a first dimension. The second sensor generates a second sensing value by detecting the movement of the movable part relative to the fixed part in a second dimension.
Data Source
AI summary
An optical system is provided, including a movable part, a fixed part, a first sensor, a second sensor, and a control unit, wherein an optical element is disposed on the movable part. The first and second sensors detect the movement of the movable part relative to the fixed part in a first dimension and a second dimension, and thus they respectively generate a first sensing value and a second sensing value. The control unit generates an error value according to the first sensing value and an error curve, and then calibrates the second sensing value according to the error value.