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首页> 外文期刊>Applied physics >An open-path tunable diode laser absorption spectrometer for detection of carbon dioxide at the Bonanza Creek Long-Term Ecological Research Site near Fairbanks, Alaska
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An open-path tunable diode laser absorption spectrometer for detection of carbon dioxide at the Bonanza Creek Long-Term Ecological Research Site near Fairbanks, Alaska

机译：一种开放路径可调二极管激光吸收光谱仪，用于在阿拉斯加费尔班克斯附近的Bonanza Creek长期生态研究站点中检测二氧化碳

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摘要

We have developed a low-power, open-path, near-infrared (NIR) tunable diode laser sensor for the measurement of near ground-level concentrations of greenhouse gases. Here, we report on instrument design, characterization, and initial measurements of carbon dioxide concentrations during deployment to a thermokarst collapse scar bog near Fairbanks, AK (USA). The optics "launch-box" portion of the instrument couples radiation from an NIR, distributed feedback diode laser operating near 1572 nm with a visible laser for alignment purposes. The outgoing beam is directed through a 3.2-mm hole in a parabolic mirror and the launch-box is oriented using a two axis, altitude-azimuth telescope mount such that the beam strikes a retroreflector target at a set distance downfield. The beam then retraces the path back to the launch-box where the light is collected on the surface of the parabolic mirror and focused onto a multi-mode fiber that transfers the radiation to an InGaAs detector. Sweeps over a similar to 1.6 cm(-1) spectral region were collected at a rate of 500 scans per second and were typically stored as 10 s sweep averages. These averaged sweeps could be individually spectrally fit for CO2 concentration or averaged into a single spectrum for fitting (after correction for slight frequency drift). Field data reported here was averaged for 2.5 min and was found to follow trends in diurnal cycles of CO2 concentration cycles reported by sensors located nearby in the field site.
机译：我们已经开发出一种低功率，开放路径，近红外（NIR）可调二极管激光传感器，用于测量近地面水平的温室气体浓度。在这里，我们报告了仪器设计，表征以及在部署到美国堪萨斯州费尔班克斯附近的热岩溶塌陷疤痕沼泽期间二氧化碳浓度的初始测量结果。仪器的光学“发射箱”部分将来自NIR的分布式反馈二极管激光器的辐射耦合到1572 nm附近，并与可见激光器耦合，以进行对准。射出的光束被引导通过抛物面镜中的3.2毫米孔，发射箱使用两轴高度方位望远镜安装座进行定向，以使光束在设定的下场距离处撞击后向反射器目标。光束然后返回到发射箱的路径，在那里光被收集在抛物面反射镜的表面上，并聚焦到多模光纤上，该多模光纤将辐射传输到InGaAs检测器。以每秒500次扫描的速度收集类似于1.6 cm（-1）光谱区域的扫描，通常以10 s扫描平均值存储。这些平均扫描可以在频谱上分别适合CO2浓度，或者平均到单个光谱中进行拟合（在校正了轻微的频率漂移之后）。此处报告的田间数据的平均时间为2.5分钟，发现该数据遵循田野附近传感器报告的CO2浓度周期的昼夜趋势。

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  • 来源
    《Applied physics》 |2017年第9期|245.1-245.10|共10页
  • 作者

    Bailey D. Michelle; Adkins Erin M.; Miller J. Houston;

  • 作者单位

    George Washington Univ, 800 22nd St NW, Washington, DC 20052 USA;

    George Washington Univ, 800 22nd St NW, Washington, DC 20052 USA;

    George Washington Univ, 800 22nd St NW, Washington, DC 20052 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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