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Research on remote sensing of broadband absorbers by using near-infrared diode lasers

机译：近红外二极管激光器对宽带吸收体的遥感研究

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This paper reports the development of an experimental technique for optical remote sensing of broadband absorbers in ambient air. Broadband absorbers have been difficult to detect due to a lack of narrow absorption features, which makes it hard to separate them from interference with other absorbing species and background. In combination with a multidimensional linear regression procedure, we have developed a further step to correct for water vapor and background influences. Various physical processes limiting the detection sensitivity were studied and solutions were developed to reduce their influences. Although the received optical signal from backscatter was very weak as no corner cube reflector was used, we have demonstrated the technique on remote sensing of broadband absorption of ethanol vapor in ambient air with a moderate detection limit of 200 ppm · m. This portable handheld system is particularly suitable for quick "point-and-measure" applications. The developed technique is also applicable for detection of other broadband absorbers.
机译：本文报道了环境空气中宽带吸收体光学遥感实验技术的发展。宽带吸收器由于缺乏窄吸收特征而难以检测，这使得很难将其与其他吸收物种和背景的干扰区分开。结合多维线性回归程序，我们开发了进一步的步骤来校正水蒸气和背景影响。研究了限制检测灵敏度的各种物理过程，并开发了解决方案以减少其影响。尽管由于没有使用角cube棱镜反射器，所以从背向散射接收的光信号非常弱，但是我们已经证明了该技术可对环境空气中乙醇蒸气的宽带吸收进行遥感检测，检测限为200 ppm·m。这种便携式手持系统特别适合于快速的“点测”应用。所开发的技术还适用于检测其他宽带吸收器。

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