Calibration Plate Mirror Reflection for 3D Measurement Accuracy
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Solution Overview
Problem
Existing 3D measurement devices require frequent and labor-intensive calibration processes, which can be inconvenient and prone to errors due to environmental factors like temperature changes and mechanical shocks, affecting the accuracy of measurements.
Innovation Solution
A calibration plate with a stable material and embedded marks, along with a method using a mirror to reflect beams, allowing for precise determination of calibration parameters and alignment, enabling automatic calibration and reducing the need for frequent recalibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional calibration plates are used, then calibration can be performed, but the process is labor-intensive and requires frequent recalibration due to environmental factors
Solution Approach 1:
The calibration plate is pre-equipped with a mirror and coded marks that encode calibration data. This preliminary preparation allows the plate to automatically provide calibration information when viewed by the camera, eliminating the need for manual calibration operations and reducing calibration time while maintaining accuracy.
Solution Approach 2:
The mirror on the calibration plate serves as an intermediary element that reflects light from the projector onto the coded marks. This intermediary mechanism enables the camera to capture encoded calibration data more reliably, improving measurement precision while reducing the frequency of recalibration needed.
2Reliability
If manual calibration processes are used, then calibration parameters can be adjusted, but the process is prone to errors and requires frequent intervention
Solution Approach 1:
The calibration plate with coded marks and mirror enables the system to perform self-calibration. The camera captures the coded information reflected by the mirror, and the system automatically processes this data to adjust calibration parameters, eliminating manual intervention and reducing human error while improving reliability.
Solution Approach 2:
The coded marks on the calibration plate provide feedback information to the system during calibration. By encoding calibration data in the marks and using the mirror to reflect projector light onto them, the system receives automated feedback that guides the calibration process, reducing operational complexity and improving reliability.
3Measurement precision
If calibration plates without mirrors are used, then the structure is simpler, but alignment determination and calibration precision are reduced
Solution Approach 1:
The mirror on the calibration plate serves multiple functions: it reflects light from the projector onto the coded marks, enhances the visibility of calibration features to the camera, and provides a reference surface for alignment determination. This multi-functionality improves alignment precision without adding excessive complexity, as the mirror integrates seamlessly with the existing calibration plate structure.
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 solution provides a stable and accurate calibration process, minimizing errors and the frequency of recalibration, while ensuring consistent performance across varying environmental conditions.
Implementation Method 1
A mirror is positioned on the surface that reflects incident beams from the 3D measurement device
Data Source
AI summary
A calibration plate and a method of calibrating a 3D measurement device is provided. The calibration plate includes a planar body having a surface. A plurality of marks are arranged on the surface. The plurality of marks being configured to be recorded by the camera and can be identified in the resulting recorded images during operation of the 3D measurement device. A mirror is positioned on the surface that reflects incident beams from the 3D measurement device.