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Operation and design of electro-optical systems are affected by atmospheric turbulence, quantified by refractive structure function parameter Cn 2. The long-term VerTurM experiment at a rural site in Northwestern Germany served to collect an extended dataset of vertical profiles of Cn 2 values up to 64 meters, completed by a characterization of the surface layer meteorology. A micrometeorological model in terms of the Monin-Obukhov similarity theory (MOST) was developed to predict the values of Cn 2 and its results were compared to the measurements. © Copyright 2017 SPIE. The Society of Photo-Optical Instrumentation Engineers (SPIE)

This AGARDograph presents state-of-the-art methods for evaluating the performance of laser systems operating in the infrared with different operational and environmental conditions. Results of the PILASTER (PISQ LASer Test and Evaluation Range) research and development program, conducted by the Italian Air Force Flight Test Centre in collaboration with the Defence Academy of the United Kingdom (Cranfield University) are presented. For aircraft experimental activities with laser systems, it is important to define test missions representative of different operational scenarios and to verify systems performance in realistic environments. Laser technology status and future technology trends are investigated, in order to determine the relative strengths and weaknesses of these technologies when applied to airborne systems. Mathematical models for laser beam propagation, mission geometry analysis, target reflectivity and detection are identified. Safety issues are analysed in the light of the operational requirements and human eye safety for airborne laser systems and guided weapons. Technical characteristics of the PILASTER range instrumentation are identified. Finally, the requirements associated with tactical and test/training mission planning are defined with the kernel algorithms of suitable simulation programs capable to assist aircrews and flight test engineers in the determination of optimal aircraft flight profiles., Flight Test Techniques Series, v26. The systems concepts and integration panel. The original document contains color images.

A device using a symmetrical Michaelson interferometer with double refracting diagonally cut crystals in the arms was developed. The latter are controlled by a field at right angles to the direction of propagation. The power required to control the modulator can be lowered by increasing the length of the crystal and decreasing its cross section. Details on the thermal expansion of various parts and materials are given and the effects of expansion on modulator operation are described. The modulator was tested between 0 and 100 Mc with a control voltage of 150 v. The model was tested in an experimental transmission of a television picture with the aid of a laser beam., Edited machine trans. of mono. Vsesoyuznaya Nauchnaya Sessiya, Posvyaschennaya Dnyu Radio (no. 22): Sektsiya Kvantovoi Elektroniki (Scientific and Technical Society of Radio Engineering and Electrical Communication. Central Government 22 All-Union Scientific Session, Dedicated to Radio Day. Section of Quantum (Electronics), Moscow, 1966, p33-40.