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Updated: Jun 16, 2026

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Subsurface Defect Localization by Structured Heating Using Laser Projected Photothermal Thermography
Published on: May 15, 2017
Summary
This study introduces an advanced laser image recorder featuring a high-speed pyramidal mirror scanner and a diffraction-limited focusing lens. These components enable high-resolution image recording with exceptional linearity and a high duty cycle.
Area of Science:
- Optical Engineering
- Imaging Technology
- Precision Mechanics
Background:
- Traditional laser image recorders often face limitations in performance and versatility.
- The development of advanced optical and mechanical components is crucial for improving imaging systems.
Purpose of the Study:
- To describe a novel laser image recorder with enhanced performance and versatility.
- To highlight the key components contributing to the recorder's capabilities.
Main Methods:
- Utilized a six-facet, beryllium pyramidal mirror scanner with high rotational speed capabilities (0-50,000 rpm) on air bearings.
- Employed a diffraction-limited focusing lens with a 54-degree flat field for efficient photographic film use.
- Integrated a cylindrical drum for precise photographic film transport.
Main Results:
- Achieved a 90% duty cycle and high linearity (0.05%) in scanning velocity conversion.
- The scanner demonstrated rapid speed change capabilities.
- The system supports a maximum of 36,800 picture elements per line over a 228.6 mm format.
Conclusions:
- The described laser image recorder represents a significant advancement in imaging technology.
- The combination of the advanced scanner and focusing lens provides high performance and versatility for image recording applications.

