Target Detection Device Calibration for Environmental Stability
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Solution Overview
Problem
Existing target detection methods struggle to maintain accuracy due to environmental changes, such as temperature fluctuations, which affect the precision of positioning and posture detection in industrial robot systems.
Innovation Solution
A target detection method that includes a calibration function, utilizing a combination of first and second position information generation devices (laser tracker and 3D scanner) to calculate and adjust quantitative values, ensuring accurate detection by calibrating the position and posture of targets before measurement, using a shape marker to account for thermal expansions and other environmental changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a dedicated positioning mechanism is used to position the arm robot and workpiece, then positioning accuracy is improved, but equipment cost increases and installation space requirements increase
Solution Approach 1:
The patent combines multiple positioning mechanisms into a unified system that uses a single coordinate system for both the arm robot and workpiece positioning. This integration eliminates the need for separate positioning mechanisms while maintaining positioning accuracy through centralized coordinate management and transformation.
Solution Approach 2:
The positioning mechanism is designed to serve multiple functions: it positions both the arm robot and the workpiece, and it accommodates multiple car models through software configuration rather than requiring separate mechanisms. This multi-functionality reduces equipment complexity while maintaining measurement precision.
2Adaptability or versatility
If multiple positioning mechanisms corresponding to different car models are provided, then adaptability to different models is improved, but the number of set-up changes increases and total set-up time becomes longer
Solution Approach 1:
A single positioning mechanism is designed to handle multiple car models through software configuration and coordinate transformation. The system can adapt to different models by loading appropriate parameter sets and performing coordinate transformations, eliminating the need for physical mechanism changes and reducing set-up time.
Solution Approach 2:
The system adapts to different car models by changing parameters such as coordinate system origins, scaling factors, and transformation matrices rather than physically reconfiguring the mechanism. This allows quick adaptation to different models through software parameter adjustment, significantly reducing set-up change time.
3Measurement precision
If optical imaging devices are calibrated in a three-dimensional spatial coordinate system, then positioning accuracy is improved, but the system becomes sensitive to environmental changes such as temperature
Solution Approach 1:
The system incorporates feedback mechanisms that continuously monitor positioning data and environmental conditions. By comparing actual measurements with expected values and applying real-time corrections through coordinate transformations, the system maintains detection accuracy despite environmental changes such as temperature fluctuations.
Solution Approach 2:
The coordinate system and transformation parameters are designed to be dynamic rather than fixed. The system can adjust coordinate transformations in real-time to compensate for environmental changes, allowing the positioning system to adapt to temperature variations and maintain reliability while preserving measurement precision.
Data Source
AI summary
There are provided a target detection method and detection device that include a calibration function and can maintain detection accuracy of a target irrespectively of a change (such as a temperature) in external environment.A target detection method includes: a step of calculating a quantitative value; a step of, at a first position information generation device, measuring a first target; a step of, at a second position information generation device, measuring a second target; a step of calculating a position of the second target using the first position information generation device as a position reference based on a measurement value of the first target obtained by the first position information generation device, a measurement value of the second target obtained by the second position information generation device, and the quantitative value; and a step of calibrating the quantitative value before measuring a third target using the second position information generation device.