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《Sensor World》 2009-12
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Freezing temperature measurement for agricultural insects

ZHU Zhi-da,WANG Chang-long,ZHANG Sheng-wei, YUAN Ting,SHEN Mao-song (Yangzhou University,Yangzhou 225009,China)  
Relationship between the lowest air temperature in winter and freezing temperature of insect decides development tendency of pest insects in next year.So,the freezing temperature of pest should be measured accurately for the tendency forecast of agricultural pest. Temperature measuring and recording system of insect consists of mini-thermal couple,MCU,signal condition circuit,PC and virtual instrument software.During the course of the experiment,a small thermal couple is put into a temperature-control refrigerator with several pests adhering to the heat terminal of the thermal couple.PC receives the real-time temperature data by serial port and completes the function of digital filtering process and so on.Experiments show that the cooling speed is slower,the freezing temperature is higher.Whether insects freeze or not,is related to both the lowest temperature and cooling speed from cold spell. In order to make an accurate forecast for insect pest,more temperature data from field should be collected to complete the record cooling curves,and more analysis of the valley-point temperatures and adjacent-point cool speeds should be made.
【Fund】: 江苏省教委基金资助项目(编号:06KJB510135 2007CXJ005)
【CateGory Index】: TH811
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