School of Environment and Natural Resource, Renmin University of China, Beijing, 100872, China.
State Key Laboratory of NBC Protection for Civilian, Beijing, 102205, China.
Anal Chim Acta. 2022 Apr 1;1200:339587. doi: 10.1016/j.aca.2022.339587. Epub 2022 Feb 12.
A simple and robust integrated handheld optical fiber dissolved oxygen (DO) sensor was developed based on a compact optical structure and phase shift measurement principle. In this device, a 1 × 4 multi-mode optical fiber bundle structure was used for the transmission of excitation light and the collection and transmission of fluorescence. The fiber optode was fabricated by coating an O sensing foil on the end of the optical fiber bundle. This elegant optical design significantly improved the optical transmission efficiency, miniaturization, portability, and stability of the entire sensor system. A low-cost photodetector (PD) was applied for simultaneous detection of the fluorescence signal and reference light signal based on the time-resolved effect. Rapid and accurate measurement of the phase shift between the fluorescence and reference light signals was achieved using phase measurement electronics and signal processing system. Based on a proposed theoretical model with temperature compensation calibration, this DO sensor was used for rapid, accurate, and reproducible detection of DO concentrations with long-term stability and low drift. The results of in-situ/on-line detection for various water samples were highly consistent with those of commercial optical oxygen sensors. The proposed DO sensor has the potential to be a powerful alternative to traditional oxygen sensors in laboratory or in field.
本研究基于紧凑的光学结构和相移测量原理，开发了一种简单而稳健的集成手持式光纤溶解氧（DO）传感器。在该装置中，使用 1×4 多模光纤束结构进行激发光的传输以及荧光的收集和传输。光纤光探头通过在光纤束末端涂覆 O 敏感染料来制备。这种优雅的光学设计显著提高了整个传感器系统的光学传输效率、小型化、便携性和稳定性。基于时间分辨效应，使用低成本光电探测器（PD）同时检测荧光信号和参考光信号。使用相移测量电子设备和信号处理系统实现了荧光信号和参考光信号之间的快速准确相移测量。基于具有温度补偿校准的理论模型，该 DO 传感器可快速、准确且可重复地检测 DO 浓度，具有长期稳定性和低漂移。各种水样的原位/在线检测结果与商业光学氧传感器高度一致。该 DO 传感器有望成为传统氧传感器在实验室或现场应用的有力替代品。
