Optical Axis Converter Calibration for Image Measuring Devices
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Solution Overview
Problem
Image measuring devices face challenges in accurately splicing together images of adjacent measurement regions due to offset positioning of optical axis converters, causing measurement light to be bent and resulting in oblique displacement axes, which complicates the alignment of images.
Innovation Solution
A calibration method involving a calibration work piece with a flat reflecting surface, where the optical axis converter is rotated and brightness detection is performed to align the converter at the position of maximum brightness, ensuring the measurement optical axis is orthogonal to the reflecting surface and parallel to the pixel array directions of the image capture element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the optical axis converter is offset from the correct position, then the measurement light is bent and the image is captured in a rotated form, but the displacement axis becomes oblique relative to the image directions causing offset at peripheral regions and making splicing difficult
Solution Approach 1:
The patent applies preliminary action by performing calibration before actual measurement operations. The calibration process includes positioning the optical axis converter using a calibration workpiece with a flat reflecting surface, detecting brightness at multiple positions, and adjusting the converter to the optimal position before conducting real measurements. This preliminary calibration ensures that the displacement axis is parallel to the image directions, preventing oblique offsets and facilitating accurate splicing of adjacent measurement regions.
Solution Approach 2:
The patent replaces manual mechanical positioning and visual alignment with an automated optical detection system. Instead of mechanically adjusting the optical axis converter based on visual inspection, the system uses brightness detection to automatically determine the correct position of the optical axis converter. The brightness detector measures light intensity at multiple positions, and the controller automatically adjusts the converter to the position with maximum brightness, substituting mechanical alignment operations with optical field-based detection and control.
2Device complexity
If the optical axis converter is manually positioned without calibration, then the device structure is simple, but the measurement light may be bent incorrectly causing image rotation and peripheral offsets
Solution Approach 1:
The patent introduces a calibration workpiece with a flat reflecting surface as an intermediary object to facilitate precise positioning of the optical axis converter. This calibration workpiece serves as a mediator between the optical axis converter and the measurement system, providing a known reference surface that reflects light back to the brightness detector. By using this intermediary calibration object, the system can accurately determine the correct position of the optical axis converter without requiring complex direct measurement mechanisms.
Solution Approach 2:
The patent utilizes brightness (optical intensity) changes as an indicator of correct positioning. The calibration process involves detecting variations in light brightness reflected from the calibration workpiece at different positions of the optical axis converter. When the converter is correctly positioned, the brightness reaches a maximum value, providing a clear visual and measurable indicator of proper alignment. This brightness-based indication simplifies the positioning process while ensuring high precision.
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 method effectively positions the optical axis converter, allowing for parallel displacement axes in the image capture, thereby simplifying the splicing of adjacent measurement regions and preventing peripheral offsets.
Implementation Method 1
an optical axis converter bending measurement light reflected off a work piece in a direction lying along a standard optical axis that intersects with a measurement optical axis of the measurement light
Implementation Method 2
providing a calibration work piece having a flat reflecting surface as the work piece
Data Source
AI summary
The present invention includes a preparatory step of providing a calibration work piece having a flat reflecting surface as a work piece, and arranging the reflecting surface to be parallel to a standard optical axis and orthogonal or parallel to pixel array directions of an image capture element; a rotation step of rotating a prism centered on the standard optical axis; a brightness detection step of detecting the brightness of an image captured by the image capture element at each of a plurality of rotation positions of the prism; and a positioning step of aligning the prism at a rotation position where the brightness detected by the brightness detection step is greatest.