In traditional interference lithography, interference fringes are typically phase locked to a stationary substrate using analog homodyne photodiode signals that are fed back to control a phase-shifting device such as an electro-optic modulator or a piezoelectrically transduced mirror. Commercially available fringe-locking systems based on this approach often achieve stability of the interferenc...

In the paper a modified digital speed measurement method is proposed. The method has a good static accuracy, like well known other measurement procedures, but its advantage consists in a constant sampling period. The method is implemented on single chip microcontroller. Experimental results proved good properties of the proposed concept.

The original LIGO suspension control system [1] used analog circuitry to implement the closed loop damping required for local control of each of the suspended optics. As installation and commissioning activities have progressed, it has become apparent that these controls do not provide the performance and flexibility that will be required for operation of the interferometers. Recent development...

This project develops and implements a safe, reliable method for contactless charging of electric vehicle batteries. The charging system's interface to the electric utility operates with unity power factor. This system accommodates many battery types by using a novel, large signal linear digital controller that can track arbitrary current profiles. Non-ohmic charging occurs through a two part, ...