Low cost "laserless" FTIR spectrometer on the farm for real-time nitrous oxide soil emission measurements

被引：3
|
作者：
Haugholt, Karl Henrik [1 ]
Lacolle, Matthieu [1 ]
O'Farrell, Marion [1 ]
Honne, Atle [1 ]
Bakke, Kari Anne Hestnes [1 ]
Lundon, Aina [2 ]
机构：
[1] SINTEF ICT, N-0314 Oslo, Norway
[2] Bioforsk Norwegian Inst Agr & Environm Res, N-2849 Kapp, Norway
来源：
APPLIED OPTICS | 2013年 / 52卷 / 04期
关键词：
N2O; NO;
D O I：
10.1364/AO.52.000B93
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A low-cost Fourier transform infrared (FTIR) instrument was developed where the traditional He-Ne reference laser was replaced by a low-cost linear encoder. An RMS sampling error of less than 20 nm was achieved by oversampling both the interferogram and the encoder signal and then resampling the interferogram using a correction table for the encoder. A gas calibration model was developed for the system, which was chosen to have a stroke length of 21 mm and, thereby, a resolution of 0.4 cm(-1) after apodization. The instrument was mounted on a vehicle and employed in an agricultural field test for measuring soil emissions, in particular nitrous oxide (N2O). The concentration of N2O was measured with a root mean squared error of 6 ppb. The results compared well with lab-based gas chromatography measurements. (C) 2013 Optical Society of America
引用
收藏
页码：B93 / B101
页数：9
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