Israel Aircraft Industries (LAI) operates a Jet Thermal Signature and Effects Facility ( JETSEF).The JETSEF facilitates the simulation of the IR radiation emitted by the exhaust system and gaseous plume of a low-flying aircraft. The flight is simulated by the effect of an external air stream flowing around the exhaust gas jet.The JETSEF complex includes automatic multichannel radiometric and data reduction systems. Furthermore, the JETSEF has a facility for the creation of an aerosol cloud around the exhaust flow produced by the simulator. The IR radiation, corresponding to an afterburning engine setting and flight speed of 0.9 Mach, was measured in the 2 to 3 microns, 3 to 4 microns and 4 to 5 microns wavebands. The angular range covered was from 00 to 90 °, where 0° is defined as the tail -on aspect angle. The data were reduced on -line and the measured radiation was stored on an IBM-AT computer.An aerosol cloud was injected into the air stream surrounding the exhaust jet flow. It was found that the IR radiation emitted by the exhaust system and 'gaseous plume was substantially reduced at all aspect angles.A theoretical model has been developed at IAI which describes the passage of IR radiation through an aerosol cloud. The model takes into consideration the absorption, the multiple scattering and the self -emission of the particles in the aerosol cloud. Using this theoretical model, the attenuation of the IR radiation by the aerosol cloud was estimated.Good agreement between the measured and calculated attenuations was obtained.

A new gimbal-based, FUR camera for several types of airborne platforms has been developed. The FUR is based on a PtSi on silicon technology: developed for high volume and minimum cost. The gimbal scans an area of 360° in azimuth and an elevation range of +15 to -105°. It is stabilized to 25 pRad-rms. A combination of uniformity correction, defect substitution, and compact optics results in a long range, low cost FUR for all low-speed airborne platforms. SUMMARY TAMAM/IAI has development a Focal Plane Array (FPA) FUR