Kalpagam, K and Naidu, PS (1987) Microprocessor-controlled automatic focusing of a lens. In: Journal of Microcomputer Applications, 10 (2). pp. 101-112.Full text not available from this repository. (Request a copy)
Maximum intensity contrast has been used as a measure of lens defocus. A photodiode array under the control of 8085 microprocessor is used to measure the maximum intensity contrast and to position the lens for best focus. The lens is moved by a stepper motor under processor control at a speed of 350 to 500 steps/s. At this speed, focusing time was found to be between 5 and 8 s. Under coherent illuminating conditions, an accuracy of ± 50 μm has been achieved.
|Item Type:||Journal Article|
|Additional Information:||Copy right of this article belongs to Elsevier Science.|
|Department/Centre:||Division of Electrical Sciences > Electrical Communication Engineering|
|Date Deposited:||15 Jan 2010 05:05|
|Last Modified:||15 Jan 2010 05:05|
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