Abstract: In a thermal imaging unit (12) including optics (16,18) for detecting a target scene (14), a detector array (26) responsive to target scene energy and a scanner (23) for scanning target scene energy from the target (14) onto the detector array (26), an imager lens assembly (120) for focusing the target scene energy onto the detector array. The imager lens assembly includes entrance means (126) for passing the target scene energy. The imager also includes both a first aspherical lens (122) for providing an intermediate focus of the target scene energy and a second aspherical lens (124) for receiving the intermediately focused scene energy and focusing the intermediately focused scene energy onto the detector array.
Abstract: A power loss protection system for use in a system having a spinning momentum wheel and connected to a power bus. The inventive system (10) isolates a protected circuit from the power bus (11) in the event of a system power loss and converts and regulates power taken from the kinetic energy stored in the spinning momentum wheel to a voltage sufficient to maintain operation of the protected circuit. In a most general sense, the inventive system includes a power loss detector (21) for detecting a power loss in the system bus and providing a first signal in response thereto and a regulator (26) for regulating the voltage derived from the momentum wheel energy to the protected circuit in response to the first signal.