A Mobile-Based High Sensitivity On-Field Organophosphorus Compounds Detecting System for IoT-Based Food Safety Tracking

作者：Han Jin, Yajie Qin, Hao Liang, Lei Wan, Hao Lan, Guoping Chen, Ran Liu, Li‐Rong Zheng, Patrick Yin Chiang, Zhiliang Hong · 发表于：Journal of Sensors · 年份：2017 · DOI：10.1155/2017/8797435 · 被引用次数：26 · 研究领域：Advanced Chemical Sensor Technologies、Biosensors and Analytical Detection、Electrochemical sensors and biosensors

A mobile-based high sensitivity absorptiometer is presented to detect organophosphorus (OP) compounds for Internet-of-Things based food safety tracking. This instrument consists of a customized sensor front-end chip, LED-based light source, low power wireless link, and coin battery, along with a sample holder packaged in a recycled format. The sensor front-end integrates optical sensor, capacitive transimpedance amplifier, and a folded-reference pulse width modulator in a single chip fabricated in a 0.18 μ m 1-poly 5-metal CMOS process and has input optical power dynamic range of 71 dB, sensitivity of 3.6 nW/cm 2 (0.77 pA), and power consumption of 14.5 μ W. Enabled by this high sensitivity sensor front-end chip, the proposed absorptiometer has a small size of 96 cm 3 , with features including on-field detection and wireless communication with a mobile. OP compound detection experiments of the handheld system demonstrate a limit of detection (LOD) of 0.4 μ mol/L, comparable to that of a commercial spectrophotometer. Meanwhile, an android-based application (APP) is presented which makes the absorptiometer access to the Internet-of-Things (IoT).