Abstract: A control system for a moveable mirror array in an optical cross connect (OXC) compensates for non-linear actuation charge response, actuation leakage, asymmetry in the derivative driving scheme of the electrostatic actuated mirror and its driving circuitry. In addition zero-crossing is resolved with a near-zero algorithm or a off-zero algorithm, which are alternately applied whether or not the mirror's target orientation is within a critical threshold. The threshold is defined as an ambiguous orientation range of the mirror while the actuating electrodes are substantially at zero charge. The control system includes an optical feedback loop that utilizes a PDA detector that provides coordinate information about an impinging laser injected into the optical telecommunication signals switched by the OXC. The laser is filtered from the reflected beam prior to its impinging on the detector. The telecommunication signal remains substantially unaffected by the optical feedback loop.

Abstract: An extendable neck/face protecting ballistic shield attached to a ballistic vest for rapid deployment between storage and neck/face protecting positions.

Abstract: A high pressure rotary union characterized by easy field maintenance and optimal simplified design. This design ensures high-speed operation without any significant loss of water pressure at pressures of about 4000 p.s.i. Vents are provided through which fluid bypassing the main seal exits the housing, providing an indication of loss of main seal. A secondary seal is provided to protect the bearing(s) from fluid.