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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Fiber-Optic Multipoint Sensor System with Low Drift for the Long-Term Monitoring of High-Temperature Distributions in Chemical Reactors
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Fiber-Optic Multipoint Sensor System with Low Drift for the Long-Term Monitoring of High-Temperature Distributions in Chemical Reactors

机译：光纤多点传感器系统具有低漂移用于化学反应器中的高温分布的长期监测

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摘要

A low-drift fiber-optic sensor system, consisting of 24 regenerated fiber Bragg gratings (RFBG), equally distributed over a length of 2.3 m, is presented here. The sensor system can monitor spatially extended temperature profiles with a time resolution of 1 Hz at temperatures of up to 500 °C. The system is intended to be used in chemical reactors for both the control of the production ramp-up, where a fast time response is needed, as well as for production surveillance, where low sensor drifts over several years are required. The fiber-optic sensor system was installed in a pilot test reactor and was exposed to a constant temperature profile, with temperatures in the range of 150–500 °C for more than two years. During this period, the temperature profile was measured every three to five months and the fiber-optic temperature data were compared with data from a three-point thermocouple array and a calibrated single-point thermocouple. A very good agreement between all temperature measurements was found. The drift rates of the 24 RFBG sensor elements were determined by comparing the Bragg wavelengths at a precisely defined reference temperature near room temperature before and after the two-year deployment. They were found to be in the range of 0.0 K/a to 2.3 K/a, with an average value of 1.0 K/a. These low drift rates were achieved by a dedicated temperature treatment of the RFBGs during fabrication. Here, the demonstrated robustness, accuracy, and low drift characteristics show the potential of fiber-optic sensors for future industrial applications.
机译：这里介绍了由24个再生光纤布拉格光栅（RFBG）组成的低漂移光纤传感器系统，同样地分布在2.3米的长度上。传感器系统可以在最高可达500°C的温度下监测空间延长的温度分析，其温度为1 Hz。该系统旨在用于化学反应器，用于控制生产斜面的控制，其中需要快速时间响应，以及生产监测，需要低传感器漂移超过几年时间。光纤传感器系统安装在试验反应器中，并暴露于恒定温度曲线，温度范围为150-500°C超过两年。在此期间，每三到五个月测量温度曲线，并将光纤温度数据与来自三点热电偶阵列和校准单点热电偶的数据进行比较。找到了所有温度测量之间的非常好的一致性。通过在两年部署之前和之后在室温附近和之后的精确定义参考温度下比较布拉格波长来确定24个RFBG传感器元件的漂移率。它们被发现在0.0k / a至2.3k / a的范围内，平均值为1.0 k / a。这些低漂移率通过在制造期间的RFBG的专用温度处理来实现。这里，稳健性，准确度和低漂移特性显示了未来工业应用的光纤传感器的潜力。

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