An Automatic Positional Controller

The accurate measurement of distance is still a fundamental problem. It could be made automatic without the involvement of any human operator. The current trend is to replace the eye by a suitable sensor which transforms the measurement into electrical signals while his hands and brain are replaced by a micro-processor controlled system.The application of Moire technique in length measurement is well-known while the advent of microprocessor has added a new dimension in the field of electronic measurement and control.In the present paper, an electronic circuit suitable for Moire technique application has been discussed. The circuit incorporates microprocessor and other supporting devices. Both hardware and software aspects of the circuit are described. The circuit performs control and measurement and finds wide application in on-line measurement of displacement as is needed for VLSI technology development and production.