Preliminary testing of acousto-optical hyperspectrometer for UAV

Basic results of the preliminary testing of acousto-optical hyperspectrometer for unmanned aerial vehicle are presented. The stability of sensing characteristics is studied. It is shown that warming-up of the photodetector as well as of the acousto-optic crystal results in variations of the output signal due to temperature drift. This study places additional requirements upon the system behaviour in changing environment. The development of calibration procedure and measuring algorithm for this purpose are considered.This work is supported by the Russian Foundation for Basic Research (project 16-29-11802 ofi_m)

Correlation search for coherent pion emission in heavy ion collisions

The methods allowing to extract the coherent component of pion emission conditioned by the formation of a quasi-classical pion source in heavy ion collisions are suggested. They exploit a nontrivial modification of the quantum statistical and final state interaction effects on the correlation functions of like and unlike pions in the presence of the coherent radiation. The extraction of the coherent pion spectrum from pi+pi-, pi+pi+ and pi-pi- correlation functions and single--pion spectra is discussed in detail for large expanding systems produced in ultra-relativistic heavy ion collisions.Comment: 21 pages, 3 eps figures, ReVTeX, corrected submission abstract. Version published in PRC 65 (2002) 064904. Added is a detailed explanation of the differences between pure coherent states and charge constrained coherent states in the case of a simple example model. The expressions for two-particle spectra taking into account both the final state interaction and the coherent component of pion emission are derived in a more general and transparent wa