3D Scanner Dynamic Pattern Adjustment for Triangulation Accuracy
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Solution Overview
Problem
Existing three-dimensional coordinate scanners face challenges in acquiring high accuracy point cloud data due to variations in light reception, object surface reflectance, angle of incidence, and multipath interference, leading to missing or faulty data points.
Innovation Solution
A noncontact optical three-dimensional measuring device comprising a projector and two cameras with fixed geometric relationships, emitting spatially varying patterns and using trigonometric principles to determine coordinates, with a processor for data collection and diagnostic procedures to adjust patterns and improve data quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If triangulation methods are used to quickly acquire coordinate data over a large area, then productivity is improved, but measurement precision deteriorates due to variations in light reception, surface reflectance, and angle of incidence
Solution Approach 1:
The system dynamically adjusts the projection pattern based on detected anomalies. The projector switches between different patterns (e.g., from a single line to multiple lines or area patterns) according to the diagnostic results, optimizing both speed and accuracy for different surface conditions
Solution Approach 2:
The system implements a feedback loop where the diagnostic procedure analyzes acquired data for anomalies, then automatically adjusts the projection pattern accordingly. This closed-loop control ensures that measurement precision is maintained while preserving high productivity
2Device complexity
If a single projection pattern is used for scanning, then device complexity is reduced, but reliability deteriorates due to inability to adapt to undesirable conditions
Solution Approach 1:
The projector is designed with multi-functionality, capable of projecting multiple different patterns (line patterns, area patterns, different orientations). This universal capability allows the single device to adapt to various surface conditions and measurement requirements, improving reliability without adding multiple separate devices
Solution Approach 2:
The system changes the projection pattern parameters (type, orientation, density) based on diagnostic results. By dynamically adjusting these parameters, the system maintains reliable data acquisition across different surface conditions while keeping the hardware simple
3Measurement precision
If automated diagnostic procedures are implemented to detect anomalies, then measurement precision is improved, but loss of time increases due to additional processing steps
Solution Approach 1:
The diagnostic procedure is performed during the initial data acquisition phase rather than as a separate post-processing step. This preliminary action allows anomaly detection to occur concurrently with data collection, minimizing additional time loss while ensuring high measurement precision
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 enhances the reliability and accuracy of three-dimensional coordinate data acquisition by detecting anomalies and automatically adjusting the scanning process, providing improved data quality and indication of areas needing additional acquisition.
Implementation Method 1
a scanner that uses triangulation methods to measure three-dimensional coordinates projects onto a surface either a pattern of light in a line (e.g. a laser line from a laser line probe) or a pattern of light covering an area (e.g. structured light). A camera is coupled to the projector in a fixed relationship, by attaching a camera and the projector to a common frame for example. The light emitted from the projector is reflected off of the surface and detected by the camera. Since the camera and projector are arranged in a fixed relationship, the distance to the object may be determined using trigonometric principles.
Implementation Method 2
the first camera having a first lens and a first photosensitive array, the first camera configured to receive a first portion of the first light reflected off the surface and to produce a first digital signal in response
Data Source
AI summary
A noncontact optical three-dimensional measuring device that includes a first projector, a first camera, a second projector, and a second camera; a processor electrically coupled to the first projector, the first camera, the second projector, and the second camera; and computer readable media which, when executed by the processor, causes the first digital signal to be collected at a first time and the second digital signal to be collected at a second time different than the first time and determines three-dimensional coordinates of a first point on the surface based at least in part on the first digital signal and the first distance and determines three-dimensional coordinates of a second point on the surface based at least in part on the second digital signal and the second distance.