Yuan Shigui, DeGrandpre Michael
Department of Chemistry, The University of Montana, 32 Campus Dr., Missoula, Montana 59812, USA.
Appl Spectrosc. 2006 Apr;60(4):465-70. doi: 10.1366/000370206776593591.
Two optical detection system designs are compared for fiber-optic chemical sensor applications. A single grating spectrograph with fiber-optic input and photodiodes at three different wavelengths is compared to 1x3 fiber-optic splitters and photodiode detectors with integrated interference filters. The splitters are used to direct the optical power to the filter photodiodes. Three types of 1x3 commercially available splitters were tested: a 400 microm fused glass fiber-optic coupler, a 1000 microm fused plastic fiber-optic coupler, and a 1000 microm glass fiber-optic bundle. This study finds that the fiber-splitter-based detection systems have similar stray light, signal-to-noise ratio, and long-term absorbance stability compared to the spectrograph detection system with a modest improvement in spectral resolution (from approximately 12 nm to approximately 6 nm). It is also much smaller in size and lower in cost. Applications of the two systems in a colorimetric CO2 partial pressure sensor are compared and similar accuracy and precision are achieved.
针对光纤化学传感器应用，对两种光学检测系统设计进行了比较。将具有光纤输入且在三个不同波长处配备光电二极管的单光栅光谱仪，与带有集成干涉滤光片的1x3光纤分束器及光电二极管探测器进行了比较。分束器用于将光功率导向滤光光电二极管。测试了三种市售的1x3分束器：一个400微米的熔融玻璃光纤耦合器、一个1000微米的熔融塑料光纤耦合器以及一个1000微米的玻璃光纤束。本研究发现，与光谱仪检测系统相比，基于光纤分束器的检测系统具有相似的杂散光、信噪比和长期吸光度稳定性，并且光谱分辨率有适度提高（从约12纳米提高到约6纳米）。其尺寸也小得多，成本更低。比较了这两种系统在比色法二氧化碳分压传感器中的应用，二者实现了相似的准确度和精密度。
