Camera-Based Motion Measurement for Machine Tools
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Solution Overview
Problem
High-precision motion-measuring devices for coordinate measuring machines and machine tools are complex to produce and calibrate, with calibration requiring consideration of various influencing variables such as temperature, humidity, and movement speed, leading to uncertainty and the need for frequent recalibration.
Innovation Solution
A motion-measuring system using an image recording device, such as a camera, to capture images of a capturing structure, allowing for the determination of speed, orientation, and movement direction by analyzing differences between recorded images and the actual structure appearance, without the need for short exposure times or complex illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-precision motion-measuring devices are used, then measurement precision is improved, but device complexity increases and calibration becomes more difficult
Solution Approach 1:
The patent replaces complex mechanical motion-measuring devices with a camera-based optical system. The camera captures images of a capturing structure on the movable part, and motion parameters are determined through image analysis rather than mechanical measurement, thereby reducing device complexity while maintaining measurement precision.
Solution Approach 2:
The patent uses a capturing structure that creates a visual copy or representation of the movable part's position and orientation. By capturing images of this structure and analyzing the differences between images, the system determines motion parameters without requiring complex mechanical measuring devices.
2Reliability
If traditional calibration methods are used considering temperature, humidity, and movement speed, then measurement reliability is improved, but calibration time and frequency increase
Solution Approach 1:
The motion-measuring system performs self-calibration by using the capturing structure and image analysis to automatically determine motion parameters. The system compensates for environmental influences and movement effects through the analysis of image differences, eliminating the need for frequent manual recalibration and reducing calibration time.
Solution Approach 2:
The patent incorporates a capturing structure designed specifically for image-based motion measurement. This structure is pre-configured on the movable part to work with the camera system, enabling the system to be ready for accurate measurement from the outset and reducing the need for subsequent recalibration.
3Measurement precision
If short exposure times are used in camera-based motion measurement, then measurement precision is improved, but device complexity and illumination requirements increase
Solution Approach 1:
The patent changes the approach from using short exposure times to using a capturing structure with specific geometric features that can be clearly identified in images taken with longer exposure times. The capturing structure's design allows for accurate motion parameter determination without requiring short exposure times or complex illumination systems.
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 simplifies the production and calibration of motion-measuring systems by accurately determining motion parameters from a single camera image, reducing uncertainty and the frequency of recalibration, while maintaining high precision.
Implementation Method 1
A motion-measuring system using an image recording device, such as a camera, to capture images of a capturing structure
Data Source
AI summary
A method for operating a motion-measuring system of a machine, such as a coordinate-measuring device or a machine tool. An image-recording device arranged on a first part of the machine records at least one recorded image of a second part of the machine. The first part and the second part can be moved in relation to each other. A capturing structure, which is formed by the second part and/or which is arranged on the second part, is captured by the at least one recorded image, and, by using information about an actual appearance of the capturing structure, a speed of the relative motion of the first part and the second part is determined from differences of the at least one recorded image from the actual appearance of the capturing structure.