Topographic Measuring Device Dual Projector Texture Pitch
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Solution Overview
Problem
Existing topographic measuring devices struggle to achieve a balance between measuring coarse and fine deformations efficiently, often limited by the resolution of textured light and camera performance.
Innovation Solution
A topographical measuring device comprising two projectors for applying textured lights with different repetition pitches to distinct portions of a sample, and two cameras to acquire images, with a control circuit to manage the acquisition and processing of images to measure both coarse and fine deformations simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If textured light with fine repetition step is used to improve measurement resolution, then fine deformation measurement capability is improved, but the device cannot effectively measure coarse deformations and the study area is reduced
Solution Approach 1:
The patent divides the measurement task into two segments: one for fine deformation measurement using textured light with fine repetition step, and another for coarse deformation measurement using textured light with coarse repetition step. This segmentation allows each segment to be optimized for its specific purpose while maintaining overall measurement versatility.
Solution Approach 2:
The patent adds a new dimension to the measurement system by introducing a second projector and second camera with different repetition step characteristics. This dimensional expansion enables simultaneous measurement of both fine and coarse deformations without compromising either capability.
2Measurement precision
If camera with high resolution is used to improve measurement definition, then fine deformation measurement is improved, but the device becomes more expensive and has larger footprint
Solution Approach 1:
The patent applies local quality by matching camera resolution to the specific measurement requirements of each region. The first camera uses resolution appropriate for coarse deformation measurement, while the second camera uses higher resolution for fine deformation measurement, optimizing overall system performance without requiring all components to have maximum specifications.
3Adaptability or versatility
If textured light with coarse repetition step is used to measure coarse deformations, then coarse deformation measurement is improved, but fine deformation measurement capability is lost
Solution Approach 1:
The measurement function is segmented between two projector-camera systems: the first system with coarse repetition step handles coarse deformation measurement, while the second system with fine repetition step handles fine deformation measurement. This segmentation ensures both measurement capabilities are preserved simultaneously.
Solution Approach 2:
The patent merges two separate measurement systems into one integrated device, combining the strengths of both coarse and fine repetition step textured light systems. The control unit coordinates both systems to work together, providing comprehensive measurement capability for deformations of any scale.
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 device effectively measures both coarse and fine deformations with improved accuracy and speed by adapting the resolution of the cameras to the textured light patterns, allowing for comprehensive deformation analysis.
Implementation Method 1
a first projector for applying a first textured light to at least a first portion of the sample; a second projector for applying a second textured light to at least a second portion of the sample
Implementation Method 2
a first camera for observing the first textured light applied to the first portion of the sample to acquire a first series of images; a second camera for observing the second textured light applied to the second portion of the sample to acquire a second series of images
Implementation Method 3
Textured light defines several areas with color differences, typically black areas and white areas with preferentially a transition through gray levels. The distance between two black areas or two white areas imposes the resolution of the deformation measurement.
Data Source
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Figure 5~6
AI summary
A topographic measuring device comprises a sample holder (1) receiving a sample (2). A first projector (3) applies a first textured light (4) to a first portion (2a) of the sample (2). A second projector (5) applies a second textured light (6) to a second portion (2b) of the sample (2) different from the first portion (2a). A first camera (7) observes the first textured light applied to the first portion (2a) to acquire first images (8). A second camera (9) observes the second textured light (6) applied to the second portion (2b) to acquire second images (10). The second textured light (6) has patterns with a second repetition pitch smaller than a first repetition pitch of the patterns of the first textured light (4).