Slewing Angle Error Correction in Light-Deflecting Devices
Solution Overview
Problem
Existing scanning micromirror systems, such as vehicle headlights and distance-measuring systems, face challenges in precisely determining slewing angles due to angle errors, which affect both distance measurement accuracy and light beam precision.
Innovation Solution
A method involving the emission of two intersecting light beams, calculation of their propagation paths, and measurement of slewing angles to determine angle errors, allowing for correction of measured slewing angles and improved precision in light beam deflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single light beam is used for distance measurement, then the device structure is simple, but the measurement precision is insufficient due to angle errors in slewing angle measurement
Solution Approach 1:
The single light beam is segmented into two separate light beams (first light beam and second light beam) that travel along different propagation paths. This segmentation allows for independent measurement of each path, enabling the calculation of angle errors through comparison of the two paths, thereby improving measurement precision without requiring complex additional hardware beyond the light splitting mechanism.
Solution Approach 2:
An optical beam splitter is introduced as an intermediary device to divide the single light beam into two separate beams. This intermediary component enables the creation of multiple measurement paths from a single light source, allowing for angle error determination through comparative analysis of the different propagation paths while maintaining device simplicity.
2Manufacturing precision
If angle errors are not corrected, then the device operation is simple, but the distance measurement accuracy and light beam precision deteriorate
Solution Approach 1:
The system implements feedback by calculating angle errors based on the difference between the first and second propagation paths and using this calculated error to correct the measured slewing angles. This feedback mechanism continuously compensates for measurement inaccuracies, ensuring high distance measurement accuracy and light beam precision while maintaining a relatively simple correction process based on geometric calculations.
Solution Approach 2:
The angle error calculation is performed preliminarily based on the known light beam angle and measured propagation paths before the final distance measurement is made. This preliminary correction of slewing angles ensures that subsequent measurements are already compensated for angular inaccuracies, improving overall measurement accuracy without adding complexity to the actual measurement process.
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 method enables precise determination and correction of slewing angles, enhancing the accuracy of distance measurements and light beam deflection, thereby improving the overall precision of light-emitting devices.
Implementation Method 1
a pivoted light-deflecting device (101), which is designed to deflect light beams
Implementation Method 2
the first light beam deflected by the light-deflecting device and reflected by an object and the second light beam deflected by the light-deflecting device and reflected by the object are received
Data Source
AI summary
A method is described for determining angle errors when measuring slewing angles of a pivoted light-deflecting device, including the following steps: emitting a first light beam and a second light beam, which enclose a light beam angle, onto the light-deflecting device; receiving the first light beam and second light beam deflected by the light-deflecting device and reflected by an object; calculating a first propagation path of the first light beam and a second propagation path of the second light beam; pivoting the light-deflecting device from an initial position to a final position, respective slewing angles of the light-deflecting device being measured in the process and a dependency of the first propagation path on the measured slewing angles being determined; and calculating an angle error for a measured slewing angle to be corrected from the set of measured slewing angles by using the light beam angle, the second propagation path and the dependency of the first propagation path on the measured slewing angle.