排灌机械工程学报2025，Vol.43Issue(10)：1064-1071,1080,9.DOI:10.3969/j.issn.1674-8530.24.0068
EGFET pH传感器及栽培基质pH值在线检测系统
EGFET pH sensor and online detection system of pH value of soilless culture substrates
摘要
Abstract
To address the low accuracy of online pH detection in cultivation substrates,a TiO2 elec-trode was fabricated by chemical etching and utilized as the working electrode in a pH sensor.An ex-tended-gate field-effect transistor(EGFET)-based pH sensor and an online detection system were de-veloped.The hardware consisted of a power supply circuit,an EGFET sensor circuit,a signal condi-tioning circuit,a voltage follower circuit,and a main control unit based on an STM32 microcontroller with ESP8266 Wi-Fi module.The software architecture included embedded firmware,an IoT cloud platform,and a mobile application for remote monitoring.Experimental results demonstrate that the EGFET-based sensor exhibits superior performance over conventional potentiometric methods,with im-provements in response time,drift,hysteresis,and linearity.In validation tests using a cultivation sub-strate with 71.4％relative moisture content,the system achieves a maximum relative error of 2.63％,representing a 16.51％reduction compared to traditional methods.The proposed system enhances the accuracy and reliability of real-time pH monitoring in agricultural substrates.关键词
pH传感器/栽培基质/延伸式栅极场效应晶体管/二氧化钛电极/pH值在线检测Key words
pH sensor/culture substrate/extended-gate field-effect transistor/TiO2 electrode/online pH detection分类
农业工程引用本文复制引用
张西良,张家祺,谢飞洋,谷加辉,胡帅,徐云峰..EGFET pH传感器及栽培基质pH值在线检测系统[J].排灌机械工程学报,2025,43(10):1064-1071,1080,9.基金项目
国家自然科学基金资助项目(32071900) （32071900）
