Optical Encoder Waveform Phase Detection for Image Aberration
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Solution Overview
Problem
Existing optical encoders face accuracy issues due to ageing or deterioration, causing aberration and distortion in captured images which affects the precision of position, motion, or angle detection.
Innovation Solution
A code plate with a pattern of alternating codes is used, where a sensor captures an image and a processor converts it into waveforms, determining phase information to calculate the object's position, reducing the impact of image aberration and distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distance between the code plate and the sensor varies due to ageing or deterioration, then the captured images become aberrated or distorted, but the position, motion or angle detection accuracy deteriorates
Solution Approach 1:
The patent transforms the spatial pattern data into temporal waveform signals. By converting the code plate pattern recognition into waveform phase detection, the system becomes insensitive to image quality degradation caused by distance variations. The waveform conversion process extracts positional information through phase differences rather than direct image pattern matching, thereby maintaining detection accuracy despite image aberration.
2Measurement precision
If the pixel count or resolution is increased to improve detection accuracy, then the image quality improves, but the memory storage requirements increase
Solution Approach 1:
The patent extracts only the essential positional information from the full image data by converting it into waveform representations. Instead of storing and processing complete high-resolution images, the system extracts phase information from waveforms corresponding to different code patterns. This extraction approach maintains measurement precision while dramatically reducing the data storage requirements compared to storing full-resolution images.
3Device complexity
If the code plate pattern is used directly for position determination, then the system is simple, but the detection accuracy is affected by image aberration
Solution Approach 1:
The patent introduces waveform signals as an intermediary between the code plate pattern and the position determination process. The waveform conversion acts as a mediator that transforms the spatial pattern into a temporal signal format. This intermediary representation is more robust to image quality variations while maintaining the fundamental simplicity of the code plate approach, thereby improving measurement precision without significantly complicating the overall system.
Data Source
AI summary
A code plate including a pattern thereon is provided. The pattern includes a first set of codes and a second set of codes. The first set of codes is associated with a first waveform. The second set of codes is associated with a second waveform.