基于声表面波技术的粮食仓储环境无源测温系统

PASSIVE TEMPERATURE MEASUREMENT SYSTEM BASED ON SURFACE ACOUSTIC WAVE(SAW) TECHNOLOGY FOR GRAIN STORAGE ENVIRONMENT

粮食的安全储存需要对粮食的温度、湿度、压力、黏度、密度等变化情况进行实时的信息采集。本系统通过采用无线无源声表面波温度检测技术实现了仓储环境温度信息数据的采集。系统采用无线无源声表面波温度传感器作为对粮仓温度采集的终端,通过自身声波频率的变化,获得输出信号频率或幅度上的差异,实现粮食仓储环境温度变化的监测并实现无线无源方式频率信号的传输,即通过温度变化时引起的频率变化及温度信息处理的算法的优化,进而实现对实时温度数据的数字化。该技术有效提高了对粮仓温度信息的采集,快速获取仓储环境的温度监测点信息,对解决因粮仓环境变化造成的粮食发霉、腐烂等现象造成的损失大有帮助。

Abstract： Realtime information acquisition of temperature,humidity,pressure,viscosity,density and so on of granary is necessary for safe storage of grain. The system realized the temperature information acquisition of grain storage environment by adopting wireless passive surface acoustic wave temperature detection technology. As granary temperature acquisition terminal, a wireless passive surface acoustic wave temperature sensor was used to acquire the difference of output signals in frequency or amplitude through the changes of sound wave frequency thereof,thereby to realize temperature monitoring of grain storage environment as well as wireless passive frequency signal transmission, that is to realize digitization of real-time changing temperature data based on the frequency changes caused by temperature changes and optimization of temperature information processing algorithm. The technology is effective in collecting granary temperature information,and quick in acquiring information of temperature monitoring points of grain storage environment, thereby obviating grain loss caused by mildewing and rotting due to environment changes of granary