Handheld 3D Scanner With Dual-Wavelength Optical Triangulation
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Solution Overview
Problem
Existing handheld 3D measuring devices project large light patterns, resulting in low-resolution 3D coordinate acquisition, require lengthy external computations, and are tethered to computers, limiting mobility and resolution.
Innovation Solution
A system comprising multiple projectors and cameras with specific wavelength filters, a processor, and a wearable unit for determining 3D coordinates directly on the handheld device, enabling high-resolution imaging and wireless operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single wavelength of light is projected, then the optical system is simpler, but multiple wavelengths cannot be simultaneously measured
Solution Approach 1:
The optical system is segmented into multiple independent detection channels, each dedicated to a specific wavelength. The first camera with first lens detects first wavelength light, while the second camera with second lens detects second wavelength light. This segmentation allows simultaneous multi-wavelength measurement while keeping each individual optical channel relatively simple.
Solution Approach 2:
Wavelength-specific optical filters are introduced as intermediaries between the object and the cameras. The first optical filter allows only the first wavelength to pass to the first camera, while the second optical filter allows only the second wavelength to pass to the second camera. These filters enable wavelength separation without requiring complex spectral analysis in each channel.
2Adaptability or versatility
If multiple cameras with wavelength filters are used, then multiple wavelengths can be simultaneously measured, but the device complexity increases
Solution Approach 1:
The system divides the measurement task into separate wavelength channels, with each camera-lens-filter assembly handling a specific wavelength. This segmentation allows the use of simpler, optimized components in each channel rather than one complex universal system.
Solution Approach 2:
Each optical channel is optimized for its specific wavelength with dedicated lenses and filters. The first lens and first optical filter are optimized for the first wavelength, while the second lens and second optical filter are optimized for the second wavelength, allowing each subsystem to operate at peak efficiency.
3Power
If data is sent to an external computer for computation, then processing power is sufficient, but mobility is limited by wired connections
Solution Approach 1:
The processing unit is merged with the handheld scanner device, combining the data acquisition and computational functions into a single portable unit. This integration eliminates the need for wired connections to external computers, enabling wireless mobility while maintaining sufficient processing power for real-time 3D coordinate computation.
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
Enables high-resolution, real-time 3D coordinate measurement with mobility and convenience by eliminating the need for external computers and wired connections.
Implementation Method 1
a first projector for projecting a first line of light at a first wavelength on an object; a second projector for simultaneously projecting a second line of light at a second wavelength on the object
Implementation Method 2
a first camera having a first lens for passing the first wavelength and blocking the second wavelength; a second camera having a second lens for passing the second wavelength and blocking the first wavelength
Implementation Method 3
a processor for determining three-dimensional (3D) coordinates of reflected points on the object based on the first image and the second image
Data Source
AI summary
A 3D measuring system includes a first projector that projects a first line onto an object at a first wavelength, a second projector that projects a second line onto the object at a second wavelength, a first illuminator that emits a third light onto some markers, a second illuminator that emits a fourth light onto some markers, a first camera having a first lens and a first image sensor, a second camera having a second lens and a second image sensor, the first lens operable to pass the first wavelength, block the second wavelength, and pass the third light to a first image sensor, the second lens operable to pass the second wavelength, block the first wavelength, and pass the fourth light. The system further includes one or more processors operable to determine 3D coordinates based on images captured by the first image sensor and the second image sensor.