Shape Measurement Apparatus Using Correcting Light-Section Lines
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Solution Overview
Problem
Existing shape measurement methods for rigid bodies, such as slabs and thick sheets, face challenges in accurately measuring surface height due to disturbances like translation, rotation around the longitudinal axis, and rotation around the width axis during conveyance, leading to measurement errors.
Innovation Solution
A shape measurement apparatus using multiple light-section lines with linear laser light beams applied from moving laser sources, including a shape-measuring light-section line and correcting light-section lines, to capture images at prescribed intervals, and an arithmetic processing unit that calculates surface shape data and corrects measurement errors by estimating and subtracting disturbance-induced height fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single light-section line is used for shape measurement, then the measurement process is simple, but measurement precision deteriorates due to disturbance from rigid body movement and rotation
Solution Approach 1:
The measurement system is segmented into multiple independent light-section lines (one shape-measuring line and two correcting lines) that simultaneously measure different aspects of the rigid body surface. Each light-section line provides independent measurement data that can be processed separately and then integrated to eliminate disturbance effects.
Solution Approach 2:
Correcting light-section lines are introduced as intermediary measurement elements that do not directly measure the target shape but instead measure the disturbance components (translation and rotation). These intermediary measurements serve as mediators to calculate and remove disturbance effects from the main shape measurement data.
2Measurement precision
If multiple light-section lines are used to correct disturbance effects, then measurement precision improves, but device complexity increases
Solution Approach 1:
The correcting light-section lines serve multiple functions: they measure translation disturbance, rotation around the longitudinal axis, and rotation around the width direction simultaneously. This multi-functionality reduces the need for separate measurement systems for each disturbance type, thereby limiting the increase in device complexity.
Solution Approach 2:
The system transitions from single-dimension measurement (one light-section line) to multi-dimension measurement by adding light-section lines in different spatial orientations. The correcting lines are positioned at different width-direction locations, creating a multi-dimensional measurement network that captures disturbance effects from multiple perspectives.
3Measurement precision
If optimization calculation is used to remove disturbance effects, then measurement accuracy improves under ideal conditions, but reliability deteriorates when measurement error is large causing convergence failure
Solution Approach 1:
The system performs preliminary separate measurements of disturbance components using correcting light-section lines before processing the main shape measurement data. By pre-characterizing the disturbance effects through dedicated correcting lines, the system avoids relying solely on optimization convergence to separate signal from noise, thereby improving reliability under large error conditions.
Solution Approach 2:
The measurement system incorporates feedback through the correcting light-section lines that continuously monitor disturbance effects. The measured disturbance data from correcting lines is fed back into the calculation process to dynamically adjust and remove disturbance effects from the shape measurement, creating a closed-loop system that maintains reliability even when measurement errors are large.
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 enables more accurate measurement of surface height even when disturbances occur, by effectively removing errors caused by translation, rotation around the longitudinal axis, and rotation around the width axis, thereby improving measurement precision.
Implementation Method 1
an imaging apparatus that applies three beams of the linear laser light to the surface of the rigid body to be measured moving relatively along the longitudinal direction and images reflected light of the three beams of the linear laser light from the surface of the rigid body to be measured
Data Source
AI summary
[Object] To measure the surface height of a rigid body to be measured more accurately even if any one of three types of disturbance of translation in the height direction, rotation around the longitudinal-direction axis, and rotation around the width-direction axis has occurred during conveyance.[Solution] A shape measurement apparatus according to the present invention uses a shape-measuring light-section line that is a light-section line extending in the width direction of a rigid body to be measured and is used to calculate the surface shape of the rigid body to be measured, a first correcting light-section line that is parallel to the longitudinal direction of the rigid body to be measured and crosses the shape-measuring light-section line, and is used to correct the effect of disturbance acting on the rigid body to be measured, and a second correcting light-section line that is parallel to the longitudinal direction of the rigid body to be measured, crosses the shape-measuring light-section line, and exists in a width-direction position of the rigid body to be measured different from the first correcting light-section line. On the basis of the two kinds of correcting light-section lines, the magnitude of disturbance is estimated at the intersection points of the shape-measuring light-section line and the correcting light-section lines; and thereby shape data obtained from the shape-measuring light-section line are corrected.