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首页> 外文会议>Conference on First Jet Propulsion Laboratory in Situ Instruments Workshop Jun 11-13, 2002 Pasadena, California, USA >Photon-counting spectrometer for elemental analysis using LIBS
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Photon-counting spectrometer for elemental analysis using LIBS

机译：使用LIBS进行元素分析的光子计数光谱仪

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摘要

Avalanche Photodiode (APD) arrays are being applied to Laser-Induced Breakdown Spectroscopy (LIBS) for elemental analysis with standoff detection capability. This instrument, which represents a valuable addition to planetary rover missions as well as Earth-based applications, benefits from the advantages common to both Geiger-mode and proportional-mode APDs, which are solid-state detectors with virtually single-photon sensitivity, higher quantum efficiency than photomultiplier tubes or intensified CCDs, and rapid sub-nanosecond response speed. We have demonstrated LIBS detectability better than 770 parts-per-billion of sodium utilizing the photon-counting Geiger-mode APD. In a LIBS system, an APD array offers the unparalleled prospect of selecting in each channel the most appropriate temporal window for detecting the target species. In real-time detection systems, such as microfluidics-based fluorescence detection of bacterial spores, these compact, robust APD arrays promise portable hand-held instruments that utilize tight optical coupling.
机译：雪崩光电二极管（APD）阵列正在应用于激光诱导击穿光谱（LIBS），以进行具有间隔检测功能的元素分析。该仪器代表了行星漫游车任务以及基于地球的应用的宝贵补充，它受益于盖革模式和比例模式APD的共同优势，它们是具有几乎单光子灵敏度的固态探测器，具有更高的量子效率要比光电倍增管或增强型CCD高，并且亚纳秒响应速度很快。我们已经证明，利用光子计数盖革模式APD，LIBS的可检测性优于770十亿分之一的钠。在LIBS系统中，APD阵列提供了无与伦比的前景，即可以在每个通道中选择最合适的时间窗口以检测目标物种。在实时检测系统中，例如基于微流体的细菌孢子荧光检测，这些紧凑，坚固的APD阵列有望实现利用紧密光学耦合的便携式手持仪器。

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