Toward single-ended absorption spectroscopy probes based on backscattering from rough surfaces: H2O vapor measurements near 1350 nm

被引：25

作者：

Wang, Ze ^{[1
]}

Sanders, Scott T. ^{[1
]}

机构：

[1] Univ Wisconsin, Madison, WI 53706 USA

来源：

APPLIED PHYSICS B-LASERS AND OPTICS | 2015年 / 121卷 / 02期

关键词：

DIODE-LASER; HIGH-SPEED; TEMPERATURE; TDLAS; TIME;

D O I：

10.1007/s00340-015-6216-8

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We demonstrate feasibility of a new class of absorption spectroscopy sensors which use return scattering from native surfaces such as the piston of an automotive engine. Our demonstration experiment collects backscatter through a 2-mm-diameter aperture, consistent with a small sensor footprint. A 20 mW DFB laser is used, but only 10 A mu W is collected. We studied the noise associated with motion of the rough surface and found an RMS level of 7 %. Wavelength modulation spectroscopy (WMS) was used to overcome this noise. We demonstrate WMS spectra of H2O vapor with a SNR of > 400 for DFB scan ranges of 0.82 and 37 cm(-1).

引用

收藏

页码：187 / 192

页数：6

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