| || Calculation of overall effective extinction cross section of several cold smoke infrared ammunitions
Author : Wang, Jiayin;Shi, Jiaming;Xu, Bo;Wang, Jiachun;Yuan, Zhongeai
Source : Defence Science Journal ; Vol:54(3) ; 2004 ; pp 329-334
Subject : 623.45 Ammunition
Keywords : Cold smoke infrared ammunition;Countermeasure devices;Smoke ammunition;Infrared technology;Dischargers;Cold smoke agent
Abstract : "The effective extinction cross section is an important parameter of the cold smoke infrared ammunition. This paper discusses the calculation of the maximal effective extinction cross section of the smoke produced by several smoke ammunitions and gives the optimal distance between the centres of the two adjacent smoke spheres. This study can provide theoretical basis for proper use of the smoke ammunition and the optimisation of the discharger. "
| || Infrared Extinction Coefficients of Artificial Aerosol
Author : Wang, Jiachun;Shi, Jiaming ;Wang, Jiayin;Ling, Yongshun;Bo, Xu
Source : Defence Science Journal ; Vol:57(4) ; 2007 ; pp 417-424
Subject : 623.5 Armaments and Ballistics;620.261 Explosives
Keywords : Infrared;Extinction;Artificial aerosol;Infrared extinction coefficient
Abstract : The artificial aerosol is widely used in the modern battlefields to protect the potential targets and to conceal the movement of personnel and materials. In this paper, the double-band infrared extinction coefficients of the artificial aerosol have been calculated and compared with the experimental data. The particulates were assumed to be small spheres and Mie's theory was employed with the grain size distribution function being lognormal. The numerical and the experimental results show that the size distribution and the materials of the particles are decisive of their infrared extinction capability.