Rotary Mirror Angle Calibration for Structured Light Scanning
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Solution Overview
Problem
Existing optical scanning devices suffer from structural errors in light-casting structures, such as reflector surface planar errors and rotation axis off-axis errors, leading to inaccuracies in determining the light-casting position and affecting scanning analysis results.
Innovation Solution
A rotation angle correction method and device for a rotary mirror that uses light stripe images to establish a mapping relationship between rotation graduation information and structured light coordinate information, correcting the light-casting position to improve scanning accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If rotation graduation information is used to determine light-casting position, then scanning operation is simplified, but scanning precision deteriorates due to structural errors
Solution Approach 1:
A reference target screen is introduced as an intermediary between the rotary mirror and the scanning space. Light stripes projected onto this screen provide a measurable reference that mediates the relationship between rotation angle and light-casting position, enabling precise calibration without directly relying on potentially erroneous rotation graduation information.
Solution Approach 2:
The patent replaces direct reliance on the mechanical rotation graduation system with an optical measurement system. By using light stripe patterns projected onto a reference screen and captured by imaging, the system substitutes mechanical angle reading with optical position measurement, thereby achieving higher precision.
2Measurement precision
If light stripe images are captured for calibration, then scanning precision is improved, but calibration time increases
Solution Approach 1:
The calibration process uses periodic light stripe projection at known rotation angles. By capturing light stripe images at specific periodic intervals during rotary mirror rotation, the system efficiently establishes the mapping relationship between rotation angle and light-casting position without requiring continuous or excessive measurements.
Solution Approach 2:
The calibration using light stripe images is performed as a preliminary action before actual scanning operations. By pre-establishing the mapping relationship between rotation graduation information and light-casting position through light stripe calibration, the system prepares correction data in advance, avoiding time-consuming corrections during actual scanning.
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
The method and device effectively correct the scanning errors caused by rotary axis deviations, optimizing scanning analysis accuracy and efficiency by establishing a precise correspondence between rotation graduation information and structured light coordinates.
Implementation Method 1
line laser irradiated onto a rotating multi-faceted reflector and then reflected to a scanned target so as to generate structured light
Data Source
AI summary
A rotation angle correction method comprises: obtaining a plurality of light stripe images cast to a reference target screen under different graduations and corresponding rotation graduation information; based on the light stripe images and corresponding rotation graduation information, obtaining a first mapping relationship; based on the first mapping relationship and the rotation graduation information, correcting coordinate information of the structured light. Based on the corrected coordinate information of the structured light and the rotation graduation information, one may cast the structured light to irradiate a scanned target and collect images, so as to complete the scanning and thus optimize a scanning result and improve a scanning analysis accuracy.