为了快速准确地检测地表水、污水的化学需氧量(COD), 设计了一种十字通透式结构光纤传感器, 建立了一种水质COD全光谱检测系统。基于该系统, 建立了COD与光谱吸光度的相关性数学模型。对配置的检测水样进行了测量, 并比较哈希DR 6000多参数水质检测仪对相同水样测量得到的数据, 可以发现, 所构建的系统与哈希DR 6000多参数水质检测仪测量COD的示值误差小于3%, 能较好的适用于水质COD实时在线检测。

In order to detect chemical oxygen demand(COD) of the surface water and wastewater quickly and accurately, a cross pass-through fiber optic sensor is designed. A full spectrum detection system of water quality COD is built. The mathematical model between COD value and absorbance spectrum is established. The COD value of tested water samples is detected by the system. Compared with HACH DR 6000 multi-parameter water quality detecting instrument, the result show that the indicating error of COD value detected by the built system and HACH DR6000 multi-parameter water quality detecting instrument is less than 3%. The built system can be better applied to real-time online detection of water quality COD.