MULTIPLEXED DIODE-LASER SENSOR SYSTEM FOR SIMULTANEOUS H2O, O-2, AND TEMPERATURE-MEASUREMENTS

被引:95
|
作者
BAER, DS [1 ]
HANSON, RK [1 ]
NEWFIELD, ME [1 ]
GOPAUL, NKJM [1 ]
机构
[1] NASA,AMES RES CTR,INST THERMOSCI,MOFFETT FIELD,CA 94035
关键词
D O I
10.1364/OL.19.001900
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
A multiplexed diode-laser sensor system has been developed to monitor multiple species and measure multiple flowfield parameters along a single path with optical fibers and scanned-laser absorption techniques. Two InGaAsP lasers were tuned over H2O transitions near 1347 and 1392 nm, and an AlGaAs laser was tuned over an O-2 transition near 760.65 nm to record fully resolved absorption concurrently at a repetition rate of 2 kHz. The system was applied to measure H2O, O-2, and temperature simultaneously in a heated static cell and in room air. Wavelength modulation with second-harmonic detection, applied simultaneously in the O-2 measurements, yielded a minimum detectable absorbance of 1.6 x 10(-6)/Hz(1/2) and an O-2 detectivity of 6.3 parts in 10(6) in a 1-m path length.
引用
收藏
页码:1900 / 1902
页数:3
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