基于交叉非对称式Czerny-Turner系统,研制了一种宽光谱、高分辨率的微型分光光度计。采用三次多项式拟合的方法对该分光光度计进行波长标定,测得其相对波长误差小于0.1 nm。采用该分光光度计搭建一套实验测量系统,并配制显色剂与六价铬标准溶液,测试该系统的性能。结果表明:该分光光度计能够满足六价铬水质在线分析仪的应用需求,为实现高精度、多波长水质参数在线监测提供了解决方案。

A high resolution wide-spectral micro-spectrophotometer is developed based on the asymmetrical cross Czerny-Turner system. The wavelength of this spectrophotometer is calibrated by the three polynomial fitting method, and the relative error of wavelength calibration is less than 0.1 nm. This spectrophotometer is used to set up an experimental measurement system, and the chromogenic agent and the standard chromium solution are formulated to test the performances of this system. The results show that this spectrophotometer can meet the application requirements of the online monitoring of hexavalent chromium water quality, which provides a solution for realizing high-precision, multi-wavelength water quality parameter online monitoring.