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Related Experiment Video

Updated: Feb 16, 2026

Testing Visual Sensitivity to the Speed and Direction of Motion in Lizards

Testing Visual Sensitivity to the Speed and Direction of Motion in Lizards

Published on: December 14, 2006

High-Speed Focus Inspection System Using a Position-Sensitive Detector.

Binh Xuan Cao^1,2, Phuong Le Hoang³, Sanghoon Ahn⁴

¹Department of Laser and Electron Beam Application, Korea Institute of Machinery & Materials (KIMM), Daejeon 34103, Korea. xuanbinh.cao@gmail.com.

Sensors (Basel, Switzerland)

|January 3, 2018

Summary

This study introduces a new focus detection technique for high-intensity laser manufacturing. The system offers rapid response and high precision, improving upon existing low-resolution methods for industrial applications.

Keywords:

CCD camera focal position detection laser micromachining position-sensitive detector single-slit masks

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Last Updated: Feb 16, 2026

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Area of Science:

Optical Engineering
Industrial Manufacturing

Background:

Precise focus detection is critical for laser-based manufacturing processes.
Current focus detection methods suffer from low resolution, limiting their effectiveness.

Purpose of the Study:

To develop a rapid-response, high-precision, and high-resolution focus inspection system.
To overcome the limitations of existing low-resolution focus detection techniques.

Main Methods:

Utilizes geometrical optics and advanced optical instruments.
Incorporates an ultrafast interface position detector and a single-slit mask for precise focus signaling.
Analyzes reflected images on an image sensor.

Main Results:

Achieves high-resolution focus detection.
Maintains high image quality even with target surface shifts along the optical axis.
Demonstrates a simple and inexpensive system design.

Conclusions:

The proposed system provides a practical solution for industrial focus inspection.
Suitable for manufacturing sophisticated structures like microcircuits and microchips.
Enhances precision and efficiency in laser manufacturing processes.