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Online visualization of small defects for a high-speed rotating object with single-pixel oblique detection
Optics Letters
|December 15, 2025
Summary
This study introduces a novel time-freezing single-pixel imaging method to visualize defects on fast-rotating objects. The technique enables clear online detection of small flaws, crucial for industrial safety and maintenance.
Area of Science:
- Optics
- Imaging Science
- Mechanical Engineering
Background:
- High-speed rotating objects are prevalent in industry.
- Minor defects on these objects pose significant risks.
- Conventional imaging struggles with motion blur from high-speed rotation.
Purpose of the Study:
- To develop a method for visualizing small defects on high-speed rotating objects.
- To enable online defect detection without motion blur.
- To enhance the contrast of small features for better visibility.
Main Methods:
- Utilized time-freezing single-pixel imaging.
- Converted dynamic imaging into a static problem by exploiting rotational periodicity.
- Employed three spaced single-pixel detectors for oblique detection to enhance feature contrast.
Main Results:
- Successfully captured images of a hard disk drive rotating at ~9,700 RPM.
- Clearly visualized artificial scratches and fingerprints on the rotating object.
- Demonstrated the capability for online defect visualization.
Conclusions:
- The proposed method effectively visualizes small defects on high-speed rotating objects.
- This technique holds potential for online non-destructive testing.
- Applicable for safety monitoring of high-speed rotating machinery.
