A non-contacting type, two dimensional position sensor was developed and tested on a moving object. The position sensor consists of an Optic RAM as the image pick up device and a control circuit which are assembled in a so called Micro D-Cam unit. Then the sensed image data were transferred to an Apple II microcomputer and analysed to detect the position of the object. Algorithms for the image processing were programmed in a machine language to do real time processing and used the edge detection method.
The developed system was tested on a rotating white disk with a black landmark. The position change of the black landmark was detected and analysed. A FFT program was used to calculate the disk rotational speed and the obtained results were very close to the true values with less than one percent error. Due to the limitation of image processing time, it was found that the developed system can be used only in low frequency zone.
