Paper Title:
A Fast Auto-Focusing Method for Laser Diode Machine
  Abstract

This paper proposes a fast imaging auto-focus method to adjust the focus of laser diode products. The image of laser diode spot is processed to be a three-value image which is distinguished to be the background, blurred region and bright region. The ratio of areas between blurred and bright regions is used to judge whether the focusing is well-done. A four-point method is modified for this three-value image to get the areas of the blurred and bright regions. Thus, we can get the criterion for auto-focus. In the meantime, we can also get the offset of the laser diode from the center of laser diode spot. The four-point method is faster and more accurate than the area, three-point, contour-tracking and least-squares error methods of center-positioning. This auto-focus method of spatial domain is also faster than other methods of the energy strength in the frequency domain. Finally, we adjust the focus length of laser light by the servo control card and the AC servo motor, and then we can get the optimal focus length from the former image processing.

  Info
Periodical
Materials Science Forum (Volumes 505-507)
Edited by
Wunyuh Jywe, Chieh-Li Chen, Kuang-Chao Fan, R.F. Fung, S.G. Hanson,Wen-Hsiang Hsieh, Chaug-Liang Hsu, You-Min Huang, Yunn-Lin Hwang, Gerd Jäger, Y.R. Jeng, Wenlung Li, Yunn-Shiuan Liao, Chien-Chang Lin, Zong-Ching Lin, Cheng-Kuo Sung and Ching-Huan Tzeng
Pages
259-264
DOI
10.4028/www.scientific.net/MSF.505-507.259
Citation
K. C. Lee, "A Fast Auto-Focusing Method for Laser Diode Machine", Materials Science Forum, Vols. 505-507, pp. 259-264, 2006
Online since
January 2006
Authors
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: T. Rümenapp, A. Lenk
257
Authors: Chin Sheng Chen, Chi Min Weng, Chih Jer Lin, Hsiao Wei Liu
Chapter 7: Contemporary Development for Optical Engineering, Image Processing, Quality and Analysis, Measurement, Instrumentation and Detection Technologies
Abstract:In this paper, we develop the auto-focus measurement system which includes the hardware and software systems. The hardware system is composed...
1217