Abstract: A fast acting electromagnetically operated shutter for protecting an imag system from damaging light, such as intense laser light, comprised of a plurality of vane type shutters driven by magnetically moveable linear racks transferring linear to rotary motion to the midportion of each vane to aid in overcoming inertia. The linear racks are comprised of an upper rack at one end of the shutters and a lower rack at the opposite end of the shutters wherein both upper and lower racks simultaneously move reciprocally together. The racks have gear teeth thereon that are meshed with alternate vanes from first the upper and then the lower racks to transfer opposing directional rotation to adjacent vanes. An electronic shutter control means responds to input damaging light intensity signals impinging light detecting sensor means.

Abstract: An easy retrofitting of a night vision thermal imager to mount a television TV) camera thereon which allows the thermal imager outputs to be viewed remotely by a CRT display. The retrofitting provides a compact and utilitarian remote viewing capability without altering the imager itself. An unpluggable mirror unit, positioned at the output of the imager, provides a folded light path allowing the TV camera to be mounted in an inverted position over the viewer and operate as a remote observation station with the mirror unit attached, or be viewed directly with the mirror unit removed.

Abstract: A modified thermal viewer and method of operating same for detecting and tially analyzing a cloud for the presence of certain chemical compounds, whereby the cloud is viewed through two or more band-pass filters independently and consecutively with each filter responsive to a different band of spectral radiation characteristic of the particular chemical agent of concern.

Abstract: A compact modularized go-no-go resolution tester is provided for use with /PVS-5 image intensifier goggles. The tester can be quickly disassembled and reassembled by operators having little or no skill and training to replace broken or expendible parts thereof. Prior adjustments of the devices are not affected by disassembly and such adjustments are easily performed.

Abstract: A compact uniform light diffuser and attenuator is supplied for use with h resolution transparencies and the like, particularly standard resolution patterns.

Abstract: A differential gear or motor driven shaft carries drive sprockets for a m chain having a load end and a tail end. The shaft also carries a pulley or gear for driving with a belt or chain a corresponding pulley or gear on an intermediate shaft. This intermediate shaft also carries a pulley or gear which drives a belt or chain, and this belt or chain in turn turns a pulley on an idler shaft. The idler shaft also has chain idler pulleys thereon and other pulleys or gears for driving with belts or chains corresponding pulleys or gears on chain storage shafts. These chain storage shaft carry chain storage sprockets. The main chain is reeved around the drive sprockets, with the load ends hanging down and the tail ends reeved around the idler pulleys and the chain storage sprockets. As the load ends of the main chain are hauled in or paid out, the tail ends are respectively fed into or out of chain storage bins beneath the chain storage sprockets.

Abstract: A variable height work surface easily and quickly adjustable from a low profile to a desired level by utilizing double acting scissor legs controlled by a screw drive mechanism.

Abstract: The invention provides a quick disconnect device for use between image insifier tubes and their power supply or their supporting apparatus.