Research On Design And Performance Test Of Ammonia Gas Sensor For Facility Agriculture

Sensors are the source technology of smart agriculture.Smart agriculture is in urgent need of large-scale development of the sensor industry.However,more than 90%of sensitive materials and core components of agricultural sensors in China have long been imported,and a comprehensive breakthrough in core technologies is urgently needed.This paper focuses on the greenhouse environment of facility agriculture,develop the preparation and equipment development of sensitive materials for gassensitive semiconductor sensors,and monitors the concentration of the volatile and harmful ammonia in agricultural production materials,fertilizers and pesticides,and provides data support for the regulation of greenhouse environment.This article focuses on breakthroughs in key technologies for preparing sensitive materials,designing sensor control circuits and data acquisition systems,carrying out laboratory and greenhouse testing and verification,and solving the problem of rapid perception of ammonia concentration in the greenhouse environment.The research content of this paper is as follows:1.A pure-phase zinc stannate gas-sensing material was prepared,and a series of experimental verifications showed that the material has high crystallinity and purity and a uniform flake structure;further,the gas-sensing performance of the material was tested online,and the experimental results showed that the material has high crystallinity and purity.The prepared zinc stannate material has good sensitivity to ammonia.At the optimal working temperature of 260°C,the sensitivity to 50 ppm ammonia reaches 3.211,and has a fast response time of 2s.2.The sensitive material control circuit was designed,the sensor principle device was developed,and the sensor principle device was experimentally analyzed using the gas distribution system;the data acquisition system was set up to verify the sensor’s excellent detection performance for ammonia,and the sensor was measuring 0-50 ppm When ammonia is used,it has outstanding signal response;based on the least square method and neural network method,the response signal and ammonia concentration are fitted to the data,and the mathematical model of ammonia concentration and voltage response is established.3.The ammonia concentration test experiment in the greenhouse environment was carried out,the experiment plan was designed,and the data acquisition system was set up.The results showed that the laboratory experiment and the greenhouse experiment have good consistency,and the response signal of the developed sensor remains stable.Greenhouse environmental regulation has certain practical significance.