A novel charge coupled device (CCD) array enables the combination of imaging and semi-active laser (SAL) target designation to enhance seeker functionality at reduced inventory cost with lower collateral damage risk. The integration of SAL detection with imaging requires a high level of spatial and temporal resolution of the laser pulse detector and its correlation with the field of view of the imaging sensor so that laser spot location and code are presented with the image in real time. This evaluation of a novel SAL CCD detector concept shows that it is possible to achieve a temporal resolution in the region of 5 sec, an order of magnitude better than the basic requirement, and to achieve sensitivity to the laser pulse that allows operation in direct sunlight. The analysis indicates that the SAL CCD meets requirements using standard CCD processes. This paper reviews the detector architecture options and shows how the temporal, spatial and sensitivity requirements can be met.
A complete thyratron crowbar protection system contained in an oil filled tank is described. This unit can protect klystrons operating at 160KV d.c. and has a dynamic range from 25KV upwards. The crowbar tube developed for the system was CX2098B, a 4.5 inch diameter ceramic, eight gap, double ended deuterium thyratron.Reliable operation at 160KV d.c. required development and testing of both the tube, the crowbar assembly and the test equipment. As a result of this effort the crowbar unit operated for three weeks without a single prefire at 160KV d.c., connected to a 4pF bank of Maxwell capacitors energised by a Glassman Series PK high voltage power supply. The high voltage thyratron crowbar unit is equipped with several unique failsafe features which cannot be included in crowbar systems based upon spark gaps or ignitrons. Confidence in the ability of spark gap and ignitron based systems to fire reliably is based on their historical track record; their future ability to operate reliably is suspect.
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