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Photoelectric Automatic Focusing System Based on Interference by T.G. Liu; H.Y. Cai; F.L. Zhang; R.A. Lessard; Y.M. Zhang is a Engineering article available to read on EtoBox.

What is Photoelectric Automatic Focusing System Based on Interference about?

The principle and the method of a new automatic focusing system are presented in this paper. The system is constructed relying on the relationship between laser wave interference patterns and defocusing displacement. A CCD linear array receives interference patterns in the form of light intensity, which are converted into digital signals afterwards. Then the computer controls a stepping motor to complete auto-focusing process according to the digital results. The system has been applied in a kind of film resolution testing instrument and it shows that it has the advantage of high accuracy, high speed and wide applications.

Who reads Photoelectric Automatic Focusing System Based on Interference?

Author

T.G. Liu; H.Y. Cai; F.L. Zhang; R.A. Lessard; Y.M. Zhang

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0143-8166)

Published

2001

Language

EN

Field

Engineering (Physical Sciences)