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用于过程分析的圆柱形红外衰减全反射传感器

Cylindrical IR-ATR Sensors for Process Analytics.

作者信息

Lambrecht Armin, Bolwien Carsten, Erb Jochen, Fuhr Hendrik, Sulz Gerd

机构信息

Fraunhofer IPM, Heidenhofstr. 8, D-79110 Freiburg, Germany.

出版信息

Sensors (Basel). 2020 May 21;20(10):2917. doi: 10.3390/s20102917.

DOI:10.3390/s20102917
PMID:32455667
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7284823/
Abstract

Infrared attenuated total reflection (ATR) spectroscopy is a common laboratory technique for the analysis of highly absorbing liquids and solids. However, in a process environment, maintaining a sufficient sample exchange and cleaning of the sensitive surface of the element is a crucial issue. An important industrial application is the measurement of isocyanate concentrations. Isocyanates are necessary for the fabrication of polyurethane materials and are among the chemicals with the highest production volume worldwide. For process applications, narrowband photometers or MEMS spectrometers are more appropriate than the use of bulky FTIR instruments frequently encountered in a laboratory environment. Toluene diisocyanate (TDI) and hexamethylene diisocyanate (HDI) concentrations are measured with a planar ATR photometer setup. Using a miniature Fabry-Perot interferometer (FPI), trace concentrations below 100 ppm (m/m) are detected. By employing an ATR element of the cylindrical shape, sensors can be realized with a smooth surface ideally suited for an automatic cleaning system in a process environment. A laboratory setup with sapphire tubes as ATR elements for incorporation in a liquid flow system is described. Reflection and transmission configurations were investigated. Measurements with acetonitrile as a less toxic substitute showed that with cylindrical ATR sensors' detection limits for isocyanate concentrations below 100 ppm (m/m) are feasible.

摘要

红外衰减全反射（ATR）光谱法是分析高吸收性液体和固体的常用实验室技术。然而，在过程环境中，保持足够的样品交换以及清洁元件的敏感表面是一个关键问题。一个重要的工业应用是异氰酸酯浓度的测量。异氰酸酯是制造聚氨酯材料所必需的，并且是全球产量最高的化学品之一。对于过程应用，窄带光度计或MEMS光谱仪比在实验室环境中经常遇到的笨重的傅里叶变换红外（FTIR）仪器更合适。使用平面ATR光度计装置测量甲苯二异氰酸酯（TDI）和六亚甲基二异氰酸酯（HDI）的浓度。使用微型法布里 - 珀罗干涉仪（FPI），可检测到低于100 ppm（m/m）的痕量浓度。通过采用圆柱形ATR元件，可以实现具有光滑表面的传感器，该表面非常适合过程环境中的自动清洁系统。描述了一种实验室装置，该装置使用蓝宝石管作为ATR元件以并入液体流动系统中。研究了反射和透射配置。用乙腈作为毒性较小的替代品进行的测量表明，使用圆柱形ATR传感器检测低于100 ppm（m/m）的异氰酸酯浓度是可行的。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4012/7284823/b77db4c62489/sensors-20-02917-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4012/7284823/16ee23c7c91d/sensors-20-02917-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4012/7284823/fa05da2810df/sensors-20-02917-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4012/7284823/c98226c068c4/sensors-20-02917-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4012/7284823/d3cf485206fa/sensors-20-02917-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4012/7284823/da7b20967aeb/sensors-20-02917-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4012/7284823/18e9d4881e21/sensors-20-02917-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4012/7284823/58177156b7ce/sensors-20-02917-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4012/7284823/79be2a0bfbbc/sensors-20-02917-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4012/7284823/527ed8875b56/sensors-20-02917-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4012/7284823/1d7e6cb76227/sensors-20-02917-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4012/7284823/b77db4c62489/sensors-20-02917-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4012/7284823/16ee23c7c91d/sensors-20-02917-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4012/7284823/fa05da2810df/sensors-20-02917-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4012/7284823/c98226c068c4/sensors-20-02917-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4012/7284823/d3cf485206fa/sensors-20-02917-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4012/7284823/da7b20967aeb/sensors-20-02917-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4012/7284823/18e9d4881e21/sensors-20-02917-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4012/7284823/58177156b7ce/sensors-20-02917-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4012/7284823/79be2a0bfbbc/sensors-20-02917-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4012/7284823/527ed8875b56/sensors-20-02917-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4012/7284823/1d7e6cb76227/sensors-20-02917-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/4012/7284823/b77db4c62489/sensors-20-02917-g011.jpg

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