Portable AACMM Structured Light Probe for Uniform Point Density
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Solution Overview
Problem
Portable articulated arm coordinate measuring machines (AACMMs) face challenges in achieving uniform point density during three-dimensional measurements, particularly when using laser line probes, which can result in varying point spacing based on measurement speed, affecting measurement accuracy.
Innovation Solution
A portable AACMM equipped with a non-contact three-dimensional measuring device featuring a projector that emits structured light with at least three non-collinear pattern elements, allowing for uniform measurement of workpiece surface points and enhanced accuracy through triangulation-based methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If laser line probe is used for non-contact measurement, then measurement speed can be increased, but point density becomes non-uniform and measurement accuracy deteriorates
Solution Approach 1:
The patent changes the fundamental measurement parameter from laser line scanning to structured light projection. By projecting multiple light lines simultaneously across the object surface and using multiple cameras to capture the reflected light, the system achieves uniform point distribution across the entire measurement area in a single capture, eliminating the speed-dependent point density issues of laser line probes
Solution Approach 2:
The patent transitions from one-dimensional laser line scanning to two-dimensional structured light patterns. By projecting a grid of light lines across the object surface and capturing them with area cameras, the system measures multiple points simultaneously across a two-dimensional area, achieving uniform point density regardless of scanning speed
2Measurement precision
If structured light device is integrated into probe end, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The patent designs the probe end with a universal mounting interface that can accommodate different measurement devices. The structured light device is integrated into the existing probe end structure, allowing it to function as both a contact probe (when equipped with touch triggers) and a non-contact structured light scanner, thereby reducing overall system complexity through multi-functionality
Solution Approach 2:
The patent merges the structured light projection system and camera system into the existing probe end housing. By integrating these components into the already-positioned probe end structure, the patent avoids adding separate external devices and reduces the overall complexity of the measurement system
3Adaptability or versatility
If removable accessory interface is added to probe end, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent implements a universal mounting interface at the probe end that can accommodate multiple types of accessories including contact probes, structured light devices, and other measurement tools. This single interface design provides multi-functionality, allowing the probe end to serve different measurement purposes without requiring multiple specialized interfaces
Solution Approach 2:
The patent segments the measurement system into modular components with standardized interfaces. The probe end becomes a separate module with a standardized mounting interface, allowing accessories to be independently attached or removed. This segmentation simplifies the overall system architecture by creating clear separation between the articulated arm, probe end, and interchangeable accessories
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 uniform point distribution and enhanced accuracy in three-dimensional measurements, enabling operators to quickly and accurately measure complex parts without the need for external connections or wiring, while allowing for both contact and non-contact measurements with the same device.
Implementation Method 1
each arm segment including at least one position transducer for producing a position signal
Implementation Method 2
the processor configured to determine the three-dimensional coordinates of a point on the object in response to receiving the position signals from the position transducers and in response to receiving the structured light by the image sensor
Data Source
AI summary
A portable articulated arm coordinate measuring machine is provided. The coordinate measuring machine includes a base with an arm portion. A probe end is coupled to an end of the arm portion distal from the base. A device configured to emit a coded structured light onto an object to determine the three dimensional coordinates of a point on the object.