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

Abstract

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 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 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 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).

Review of The Application of Digital Transformation in Food Industry

“…Utilizing wireless sensors, the system measured temperature along the cold chain in food processing, encompassing food preparation and transportation. Jin et al (2017) introduced a novel mobile sensitivity absorptiometer to monitor pesticide residues in agricultural fields. The system incorporated a photo detection front-end sensor and an on-board microcontroller, facilitating communication with 4G technology between smartphones, the cloud, and food safety specialists, while Bluetooth technology enabled communication with the on-field detector.…”