A tunable diode laser absorption spectrometer for moisture measurements in the low parts in 109 range

被引：5

作者：

Edwards, CS ^{[1
]}

Barwood, GP ^{[1
]}

Bell, SA ^{[1
]}

Gill, P ^{[1
]}

Stevens, M ^{[1
]}

机构：

[1] Natl Phys Lab, Teddington TW11 0LW, Middx, England

来源：

MEASUREMENT SCIENCE AND TECHNOLOGY | 2001年 / 12卷 / 08期

关键词：

moisture measurement; humidity measurement; semiconductor lasers; infrared spectroscopy; frequency modulation; spectroscopy; gas detectors;

D O I：

10.1088/0957-0233/12/8/331

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A tunable diode laser absorption spectrometer for trace moisture measurements at atmospheric pressure using a strong water vapour absorption at 1393 nm has been characterized and its performance enhanced. It has been evaluated by comparison with the NPL Low Frost-point Generator and the signal temperature dependences of the modulator, cell and detector module have been investigated by the implementation of active temperature control. In tests over the moisture range 15 parts in 10(9) by volume (ppb(v)) to I ppm, the spectrometer displayed a short-term sensitivity of 1.6 ppb(v) for an averaging time of 50 s and a reproducibility of 12 ppb(v) over a period of three months.

引用

收藏

页码：1214 / 1218

页数：5

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