基于单传感器补偿融合的农药检测系统设计

针对当前用于农药残留的现场检测仪器存在检测时间长、重复性差及抗温光干扰能力有限等不足，基于酶抑制法结合前置光路补偿及数据融合算法设计了一种稳定、可用于现场检测的便携式农药残留检测系统。该系统主要包括吸光度感知模块和信号数据融合调理模块。吸光度感知模块在样品水浴恒温前提下，增加前置补偿检测光路，降低温度及杂光信号干扰；数据融合调理模块将经光电转化及电路采集的信号分组融合，增强信号真实性。测试表明，该传感器系统具有良好的稳定性与重复性(相对标准偏差小于2.5%)，补偿光路的引入有效降低了外界光干扰。经实验证实抑制率高于70%的样品验证率达85%，且抑制率高于50％时不同农药检出浓度均在0.5~5.0 mg/kg范围内，满足现场检测需求。

Abstract

Considering the problems of long detection time, poor reproducibility and limited resistance to light and temperature interference of equipment used for on-site detection of pesticide residues in the current market, a portable pesticide residue detector is designed based on enzyme inhibition and the data fusion algorithm. The system mainly includes an absorbance sensing module and a signal data fusion conditioning module. The absorbance sensing module uses front optical compensation path to eliminate common optical signal interference. The signal data fusion conditioning module groups and fuses the electrical signal in order to enhance signal authenticity. The test shows that the sensor system has good stability and reproducibility (relative standard deviation is lower than 2.5%), and the introduction of front optical compensation path eliminates the common optical signal interference effectively. Validation rate of samples whose inhibition rate is higher than 70% is up to 85%. When the sample inhibition rate reaches 50%, the pesticides in the concentration range of 0.5~5.0 mg/kg can be detected, which meets the demand of on-site detection.

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