Design and Application of Ultra-Small Optical Fiber Spectrometer in Multi-Parameter Water Quality Online Analyzer

In this paper, an ultra-small optical fiber spectrometer with wide bandwidth and high resolution is developed based on the asymmetrical cross Czerny-Turner system, the volume of the spectrometer is only palm size, which greatly saves the installation space and improves the measurement accuracy. This optical fiber spectrometer was applied as a beam splitting system in a multi-parameter water quality online analyzer developed by our company, and the performance of the analytical instrument is tested according to the national metrological verification regulations and environmental protection industry standards. The experimental results show that the optical fiber spectrometer can meet the application requirements of the multi-parameter water quality online analyzer, with high measurement accuracy, which effectively improves the timeliness and accuracy of water quality monitoring, and provides the strong technical support for the construction of water quality safety monitoring. The ultra small design also provides feasibility for the design of compact and portable multi-parameter water quality online analyzers, which is of great significance for the iterative upgrade of water quality analysis instruments.