NIR sensor for aqueous urea solution film thickness and concentration measurement using a broadband light source

Lubnow M.; Dreier T.; Schulz C.

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NIR sensor for aqueous urea solution film thickness and concentration measurement using a broadband light source

机译：用于尿素水溶液膜厚度和浓度测量的NIR传感器，使用宽带光源

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We demonstrate a multi-wavelength near-infrared (NIR) broadband absorption sensor for the simultaneous monitoring of layer thickness and urea concentration of aqueous urea solutions. Samples were prepared in thin-layer quartz transmission cells. Film thickness and urea mass fraction (at constant temperature) were determined from measured transmittance ratios in characteristic wavelength bands selected by narrowband filters in front of the detector and converted to absorbance ratios. Suitable emission bands were selected depending on the sensitivity of the NIR absorption spectrum of the solution with respect to temperature and solute concentration. For this purpose, Fourier transform IR spectra of aqueous urea solutions were recorded in the 1250-2500 nm wavelength range for urea concentrations between 0 and 40 wt.% and temperatures between 298 K and 338 K. A prototype sensor was designed using a continuous-wave fiber-coupled incoherent tungsten lamp, subsequent intensity modulation, and lock-in detection of the transmitted radiation. The sensor concept was validated with measurements using a calibration cell providing liquid layers of variable thicknesses (7-1000 mu m). (c) 2019 Optical Society of America

机译：我们展示了一种多波长近红外（NIR）宽带吸收传感器，用于同时监测尿素溶液的层厚度和尿素浓度。在薄层石英传输单元中制备样品。从检测器前方的窄带滤光片选择的特征波长带中测得的膜厚度和尿素质量分数（处于恒定温度）并转换为吸光度比。根据温度和溶质浓度选择合适的发射带，取决于溶液的NIR吸收光谱的灵敏度。为此目的，在1250-2500nm波长范围内记录尿素水溶液的傅里叶变换IR光谱在0至40重量％之间的尿素浓度和298k和338k之间的温度。使用连续设计原型传感器。波纤维耦合的非连贯钨灯，随后的强度调制和锁定检测透射辐射。使用提供可变厚度的液层（7-1000μm）的校准电池来验证传感器概念。（c）2019年光学学会

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《Applied optics》 |2019年第16期|共7页
作者
Lubnow M.; Dreier T.; Schulz C.;
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Univ Duisburg Essen Inst Combust &

Gas Dynam React Fluids Carl Benz Str 199 D-47057 Duisburg Germany;

Univ Duisburg Essen Inst Combust &

Gas Dynam React Fluids Carl Benz Str 199 D-47057 Duisburg Germany;

Univ Duisburg Essen Inst Combust &

Gas Dynam React Fluids Carl Benz Str 199 D-47057 Duisburg Germany;

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NIR sensor for aqueous urea solution film thickness and concentration measurement using a broadband light source

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