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Chemical sensing by differential thermal analysis with a digitally controlled fiber optic interferometer

机译:通过数控光纤干涉仪通过差热分析进行化学感测

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摘要

In this work the implementation of an optical fiber interferometric system for differential thermal analysis enabling the identification of chemical species is described. The system is based on a white light Mach-Zehnder configuration using pseudo-heterodyne demodulation to interrogate two identical fiber Bragg gratings (FBG) in a differential scheme. System performance is compared using either standard hardware or low cost virtual instrumentation for operation control and signal processing. The operation with the virtual system enabled temperature measurements with a ±0.023 °C resolution nearly matching the performance of the standard hardware. The system ability to discriminate chemical species by differential thermal analysis was demonstrated. Mixed samples of acetone and methanol could be successfully identified, indicating the suitability of the system for high precision measurements using low cost instrumentation.
机译:在这项工作中,描述了用于差热分析的光纤干涉系统的实现,该系统能够识别化学物质。该系统基于使用伪外差解调的白光Mach-Zehnder配置,以差分方式询问两个相同的光纤布拉格光栅(FBG)。使用标准硬件或低成本虚拟仪器对系统性能进行比较,以进行操作控制和信号处理。使用虚拟系统进行操作,可以以±0.023°C的分辨率进行温度测量,几乎与标准硬件的性能相匹配。通过差示热分析证明了系统区分化学物质的能力。丙酮和甲醇的混合样品可以成功鉴定,表明该系统适用于使用低成本仪器进行高精度测量。

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