Displacement Measuring Apparatus with Position Correction for Dynamic Objects
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Solution Overview
Problem
Conventional three-dimensional measuring methods using the light section method require prolonged measurement times, especially when the position or posture of the measurement object changes, leading to failure or incorrect measurements due to a narrow scanning range.
Innovation Solution
A displacement measuring apparatus equipped with a light projector, scanning part, light receiver, luminance image generator, setting unit, correction information storage, position corrector, and measurement controller, which allows for real-time correction of the measurement position using position correction information, enabling efficient displacement measurement even when the object's position or posture changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the scanning range of the measurement light is narrowed to shorten measurement time, then productivity is improved, but reliability deteriorates because the measurement position may fall outside the scanning range when the object's position or posture changes
Solution Approach 1:
The system performs preliminary scanning of a wide range to capture the entire measurement object before the actual measurement. This preliminary action identifies the object's position and posture, allowing the system to subsequently focus the measurement light on the correct region even when the object moves or changes posture during measurement.
Solution Approach 2:
The system uses feedback from the preliminarily generated luminance image to dynamically adjust the measurement position. By comparing the object's actual position and posture detected in the luminance image with the predetermined measurement position, the system corrects the measurement position to ensure it falls within the scanning range, thereby maintaining measurement reliability.
2Reliability
If the scanning range is expanded to cover position changes, then reliability is improved, but measurement time increases
Solution Approach 1:
The measurement process is divided into two segments: a preliminary scanning phase that covers a wide range to identify the object's position and posture, and a focused measurement phase that concentrates the measurement light on the specific region containing the measurement position. This segmentation allows the system to maintain reliability during position changes while minimizing measurement time.
Solution Approach 2:
The system performs a preliminary scan of a broader range than strictly necessary for the final measurement, but only performs the actual measurement on the specific region of interest. This partial action approach ensures that position changes are accounted for while avoiding the need to continuously scan the entire wide range during measurement, thus balancing reliability and productivity.
3Adaptability or versatility
If the measurement light scans the whole measurement object, then adaptability is improved to handle position changes, but measurement time is prolonged
Solution Approach 1:
The system performs a preliminary scan to adapt to the measurement object's position and posture before the actual measurement. This preliminary action provides the adaptability needed to handle position changes, while the subsequent focused measurement on the corrected position keeps the overall measurement time short.
Solution Approach 2:
The system dynamically adjusts the measurement position based on real-time detection of the object's position and posture from the luminance image. This dynamic adaptation allows the system to maintain high adaptability to position changes while focusing the measurement light only on the necessary region, avoiding the need for continuous full-range scanning.
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 apparatus enables rapid and accurate displacement measurement at a predetermined position of the measurement object by correcting for position changes, reducing measurement time and ensuring accurate results.
Implementation Method 1
A three-dimensional measuring method using the principle of triangulation, generally called a 'light section method'
Data Source
AI summary
To enable short-time measurement of a displacement at a predetermined position of a measurement object even when the position or the posture of the measurement object is changed. During operation of a displacement measuring apparatus, the position and the posture of a measurement object are determined by using position correction information, and a measurement position is corrected. The corrected measurement position is irradiated with measurement light. The measurement light that is emitted to and is reflected back from the measurement position is received by a light receiver. The light receiver outputs a received-light quantity distribution for displacement measurement, and a displacement at the measurement position is measured on the basis of the received-light quantity distribution.