Mars laser hygrometer

被引：25

作者：

Webster, CR

Flesch, GJ

Mansour, K

Haberle, R

Bauman, J

机构：

[1] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA

[2] NASA, Ames Res Ctr, Moffett Field, CA 94305 USA

来源：

APPLIED OPTICS | 2004年 / 43卷 / 22期

关键词：

D O I：

10.1364/AO.43.004436

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We have designed and built a miniature near-IR tunable diode laser (TDL) spectrometer for measuring in situ the water vapor mixing ratio either in the Martian atmosphere or thermally evolved from Martian soil or ice samples. The laser hygrometer uses a thermoelectrically cooled single-mode distributed-feedback TDL at 1.87 mum to scan over a selected vibration-rotation line of both H2O and CO2 near 5327.3 cm(-1). A working prototype that weighs only 230 g has been built and used to generate spectra whose analysis demonstrates precision sensitivities as fine as 1 part in 106 by volume in 1 s or 0.1 part in 10(6) in 10 s at Martian pressures and temperatures. Absolute uncertainties of similar to5% are calculated. (C) 2004 Optical Society of America.

引用

页码：4436 / 4445

页数：10

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