Single-pulse temperature measurement in supersonic air flow with predissociated laser-induced thermal gratings

被引：17

作者：

Barker, PF ^{[1
]}

Grinstead, JH ^{[1
]}

Miles, RB ^{[1
]}

机构：

[1] Princeton Univ, Dept Mech & Aerosp Engn, Princeton, NJ 08544 USA

来源：

OPTICS COMMUNICATIONS | 1999年 / 168卷 / 1-4期

关键词：

laser-induced gratings; predissociation; thermometry; acoustic; air; O-2;

D O I：

10.1016/S0030-4018(99)00336-3

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We report single-pulsed, spatially-resolved temperature measurements in unseeded low-speed and supersonic air using the acoustic decay of laser-created thermal gratings. A low energy 193 nm excitation scheme was employed to create thermal gratings by predissociation of O-2 in the flow. The acoustic decay was monitored over a few hundred ns by a continuous-wave argon-ion laser. This technique is insensitive to laser energy fluctuations as it is a frequency rather than an intensity measurement. Single-pulse measurements in Mach 3.9 and Mach 2.0 nozzle flows were analyzed to a temperature uncertainty of better than 7% by use of power spectra of the time domain signals. Higher accuracy is expected with improved calibration measurements. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：177 / 182

页数：6

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