Multi-Wavelength 3D Scanner for Speckle Reduction and Eye Safety
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing handheld laser three-dimensional scanners are limited by single wavelength technology, leading to poor applicability and high costs, making them less effective and reusable.
Innovation Solution
A three-dimensional scanning method utilizing multiple lasers with different wavelengths, coupled with at least two cameras and synchronized laser projectors, which calibrate internal camera parameters and position relationships to generate accurate three-dimensional point cloud data through triangulation and epipolar constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If blue laser light is used for scanning, then camera recognition accuracy is improved and speckle phenomenon is reduced, but human eye safety deteriorates requiring protective goggles
Solution Approach 1:
The patent applies multi-functionality by equipping the scanning system with multiple laser light sources of different wavelengths (blue laser and red laser). This allows the system to switch between wavelengths based on application requirements: blue laser for high-precision scanning when eye protection is feasible, and red laser for scenarios prioritizing operator safety, thereby making the system adaptable to multiple functional needs.
Solution Approach 2:
The patent implements parameter changes by varying the wavelength parameter of the laser light source. The system can switch between blue laser (shorter wavelength, higher precision) and red laser (longer wavelength, safer for eyes) depending on the specific scanning requirements and safety considerations, thus optimizing performance while managing harmful effects.
2Object-affected harmful factors
If red laser light is used for scanning, then human eye safety is improved and stability is enhanced, but measurement precision deteriorates due to obvious speckle phenomenon
Solution Approach 1:
The system achieves universality by providing multiple laser wavelength options, allowing it to function effectively in both safety-critical applications (using red laser) and high-precision requirements (using blue laser), making the same system suitable for diverse operational contexts.
Solution Approach 2:
The system changes the wavelength parameter of the laser source to optimize performance: red laser wavelength is selected when safety is the priority, while blue laser wavelength is selected when measurement precision is the priority, thus dynamically adjusting parameters to resolve the contradiction.
3Device complexity
If a single wavelength laser is used in the scanner, then device complexity is reduced, but adaptability deteriorates making the scanner less reusable across different scenarios
Solution Approach 1:
The patent directly applies multi-functionality by integrating multiple laser light sources with different wavelengths into a single scanner. This enables the scanner to adapt to different three-dimensional scanning scenarios by selecting the appropriate wavelength, significantly improving reusability and versatility without requiring multiple separate devices.
Solution Approach 2:
The patent combines multiple laser sources (blue laser and red laser) into a single integrated scanning system. By merging these different wavelength sources along with the corresponding optical paths and control mechanisms, the system achieves high adaptability while maintaining a unified device 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
This approach enhances the scanner's applicability and reusability, providing high-precision scanning in various scenarios while ensuring safety and cost-effectiveness by using blue and red wavelengths, reducing speckle interference and improving resolution.
Implementation Method 1
Based on two-dimensional (2D) image data of a light pattern emitted by the projector onto an object
Implementation Method 2
obtain three-dimensional (3D) coordinate data of the object... based on triangulation
Data Source
Figure 1~2
Figure 3
AI summary
A three-dimensional scanning method including a plurality of lasers with different wavelengths is provided. A scanner that implements the three-dimensional scanning method comprises at least two fixed cameras and at least two laser projectors, the at least two laser projectors correspond to at least two different wavelengths, and a spatial position relationship between the two cameras is calibrated and known. The three-dimensional scanning method is as follows: according to 2D patterns of laser contour lines projected onto a surface of a scanned object captured by the two cameras, respectively identifying two-dimensional line sets at highlight centers, and then obtaining three-dimensional contour point cloud data according to triangulation and epipolar constraint. A scanner that implements the three-dimensional scanning method including a plurality of lasers with different wavelengths is also provided. The present invention has multiple different wavelengths and good applicability, increase reusability of a single scanner, and enhance cost-effectiveness.