MEASUREMENT OF GAS-PHASE SOUND SPEED AND THERMAL-DIFFUSIVITY OVER A BROAD PRESSURE RANGE USING LASER-INDUCED THERMAL ACOUSTICS

被引：26

作者：

CUMMINGS, EB ^{[1
]}

HORNUNG, HG ^{[1
]}

BROWN, MS ^{[1
]}

DEBARBER, PA ^{[1
]}

机构：

[1] METROLASER,APPL SPECT GRP,IRVINE,CA 92714

来源：

OPTICS LETTERS | 1995年 / 20卷 / 14期

关键词：

D O I：

10.1364/OL.20.001577

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We report on the detection and analysis of signals generated from gas-phase laser-induced gratings over a large range of static pressure (0.04-100 atm). We employed the experimental technique of laser-induced thermal acoustics and performed measurements on mixtures of NO2 in air and CO2 as a function of pressure. Accurate analysis of the acquired data was obtained from a full theory, including beam size effects. The theory fully reproduces the observed data for a ratio of molecular mean free path to grating wavelength extending from 1 to 4 x 10(-4). Nonlinear, least-squares fits between modeled and experimental signals provided accurate values of the sound speed and thermal diffusivity.

引用

页码：1577 / 1579

页数：3

共 10 条

[1]

BROWN MS, 1995, 33RD AIAA AER SCI M

[2] LASER-INDUCED THERMAL ACOUSTICS - SIMPLE ACCURATE GAS MEASUREMENTS [J].