Andrey V. Savin

Choice of working parameters of pressure recovery systems for high-power gas flow chemical lasers

The general view of PRS is shown in the paper [1] of the present book. The PRS is known gasdynamic device consisting from the next main elements: supersonic diffuser and supersonic ejector. Traditionally it is utilized for providing of supersonic wind tunnels exhaust.

Pressure recovery systems for high-power gas flow chemical lasers

Some important applications of High Power Gas Flow and Chemical Lasers (HPGCL) are aimed to ground level operations. HPGCL are understood here as open cycle machines. It means that after the laser cavity their exhaust gases run out to the ambient atmosphere. Exhaust gas products after resonator cavity cannot be evacuated directly to atmosphere. The atmosphere pressure on the sea level exceeds the cavity pressure by 1 0 N20 times for CO2 gasdynamic lasers (GDL) and by 150 N200 times for chemical oxygen-iodine lasers (COIL).

Explosives trace detection in the process of biometrical fingerprint identification for access control

A method for trace detection of explosives on the surface of biometric fingerprint scanner is proposed and its sensitivity explored. The method is based on attenuated total reflection mid-infrared spectroscopy. The detection limit is about several microgram and the detectivity increases with the wavelength used for scanning. The advantages of the proposed method include high selectivity and thus low false alarm level, applicability to low vapor pressure explosives and low cost.

Numerical simulation of gas dynamic flows in pressure recovery systems of supersonic chemical lasers

Advanced chemical iodine laser technology will logically include novel all gas phase generation techniques for an iodine energy donor and the injection of atomic rather than molecular iodine. Candidate methods are discussed for the creation of an all gas phase energy donor as well as for injecting atomic iodine. This research will lead directly to designs that will be fabricated and tested extensively with detailed diagnostics to evaluate the chosen designs performance attributes. Preliminary analysis and modeling of the ElectriCOlL system concept is presented. ElectriCOIL will reduce weight and simplify both military and commercial chemical iodine laser systems. Potential cost and weight savings are also envisioned as the massive quantities of liquid chemicals will be completely eliminated from the device operation.

Detection of explosives traces on documents by attenuated total reflection method

The technical devices of explosives trace detection are discussed in this work. The attenuated total reflection method (ATR) is considered for detection of explosives traces on different things (documents, clothes, fingers). The results of experiments with Fourier spectrometer and ATR attachment for explosive trace detection are presented. The optical scheme and design of the compact testing device are discussed. The device includes the document information scanner and at the same time - the trace detector of explosives on the document cover.

Optical beam quality of COIL

The questions of optical beam quality of COIL are considered. The classification and meanings of different type of optical aberrations in COIL is presented. The ways of compensation of amplitude aberration by structure-parametrical optimization of the unstable resonator are offered. The scheme of automatically resonator alignment for compensation of phase aberrations originated from misalignment is presented. The 3D numerical modeling and investigation of gas flow and chemical kinetic in COIL is fulfilled. The scales and magnitude phase aberrations coimected with gas flow non-homogeneities are analyzed. The optimization of the COIL nozzle bank length from point of view of maximal beam brightness is fulfilled.

Lidar system for atmospheric turbulence measurement with Mersen telescope

In this work the lidar system for measurements of atmospheric turbulence structural function Cn2 are presented. Method of such measurements is based on increasing of focal spot on the receiver after beam pass through turbulent atmosphere. In this work the receiving-transmission system on the base of Mersen telescope with main mirror diameter 0.5m is used. Features connected with optical system aberrations are considered. The results of experimental investigation are presented.

High-efficiency nitrogen-based 14-kW COIL

14 kW CW COIL has been modernized and tested. Experimental and numerical methods used for diagnostics and simulation of laser operation are presented, as well as results of experiments and numerical simulation.

Ten kilowatt COIL: design and test results

Ten kilowatt CW COIL with originally designed jet-type SOG has been developed and tested. Experimental and numerical methods used for diagnostics and simulation of laser operation are presented, as well as results of experiments and numerical simulation