3D Shape Measurement With Probe Position Error Correction
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Solution Overview
Problem
Existing three-dimensional shape measurement techniques suffer from inaccuracies due to insufficient positional accuracy of movement mechanisms, particularly when measuring narrow portions.
Innovation Solution
A shape measuring apparatus that includes a measurement probe, movement mechanism, and measurement control device to correct positional errors by performing preliminary and main measurements, using a robot with low cost and high flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a low-cost robot is used as the movement mechanism, then device cost is reduced and flexibility is improved, but measurement precision deteriorates due to insufficient positional accuracy
Solution Approach 1:
The system performs a preliminary measurement before the main measurement to detect positional errors of the measurement probe. Based on the detected error, the system calculates a correction amount and applies it to the probe position. This preliminary action compensates for the low positional accuracy of the robot, enabling high-precision measurement despite using a low-cost movement mechanism.
2Adaptability or versatility
If a robot with high flexibility is used, then adaptability to different measurement tasks is improved, but measurement precision deteriorates due to positional errors
Solution Approach 1:
The system uses the measurement probe to detect the actual position of the measurement target, compares it with the intended position, and generates feedback about the positional error. This feedback is used to calculate a correction amount that is applied to the probe position, creating a closed-loop control system that maintains measurement precision while using a flexible robot.
3Manufacturing precision
If the measurement probe is moved to multiple positions for comprehensive shape measurement, then measurement completeness is improved, but the accumulation of positional errors increases
Solution Approach 1:
Before performing measurements at multiple positions, the system executes a preliminary measurement at each position to detect positional errors. The correction amounts calculated from these preliminary measurements are applied to compensate for errors at each position. This approach prevents error accumulation by correcting errors locally at each measurement position rather than allowing them to accumulate across multiple positions.
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
Enables high-accuracy three-dimensional shape measurement even with relatively low-cost and flexible movement mechanisms like robots, ensuring precise measurements of complex shapes including narrow portions.
Implementation Method 1
a measurement probe configured to measure a distance from a portion to be measured of an object by irradiating the portion to be measured with measurement light
Data Source
AI summary
An object is to provide a technique capable of measuring a shape of an object while maintaining accuracy even when positional accuracy of a mechanism configured to move a probe is insufficient. A measurement control device 210 controls a movement mechanism 500 to move a measurement probe 160 to a target position of a target to be measured, calculates an error between an actual position of the measurement probe 160 detected by the measurement probe 160 and the target position, corrects the error by moving the measurement probe 160 by the movement mechanism 500 based on the calculated error, and then causes the measurement probe 160 to perform a distance measurement.