Study of spectral characteristics of radiation from a thermal wake of a pulsating optical discharge in a supersonic air flow

被引：3

作者：

Malov, A. N. ^{[1
]}

Orishich, A. M. ^{[1
]}

Terent'eva, Ya. S. ^{[1
]}

机构：

[1] Russian Acad Sci, Siberian Branch, SA Khristianovich Inst Theoret & Appl Mech, Novosibirsk 630090, Russia

来源：

QUANTUM ELECTRONICS | 2015年 / 45卷 / 10期

关键词：

pulsating optical discharge; thermal wake; cavern; supersonic air flow; CO2-LASER PULSES; BREAKDOWN;

D O I：

10.1070/QE2015v045n10ABEH015842

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The spectral characteristics of the thermal wake of a pulsating optical discharge (POD) in a supersonic air flow are studied. The POD is stimulated by radiation of a mechanically Q-switched, repetitively pulsed CO2 laser with a pulse repetition rate of 7-150 kHz and a power up to 4.5 kW. The flow is produced by means of the supersonic aerodynamic MAU-M setup having a conic nozzle with a critical cross-section size of 50 mm, the Mach number being 1.3-1.6. We describe in detail the system of optical diagnostics that allows the detection of the spectrum of the weak thermal wake glow against the background of high-power POD radiation. The glow of the thermal wake is due to the emission of light by atoms and ions of nitrogen and oxygen, carried by the flow in the form of hot low-density gas clouds (caverns). The wavelengths of the thermal wake emission and the data on the transitions, corresponding to the spectral lines are presented.

引用

页码：973 / 978

页数：6

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