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《Electronic Measurement Technology》 2009-07
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Online measurement method for dissolved oxygen

Zhu Yaming Ding Weimin (College of Engineering,Nanjing Agricultural University,Nanjing 210031)  
This paper simply expounds the working principle of dissolved oxygen probe of film mulching Primary cell type,analyzes the temperature characteristics and forms the model of the temperature characteristics of the sensor. Put forward an online measurement of dissolved oxygen method,and use AT89S52 Single-chip computer and single-bus digital temperature sensor DS18B20. The design of the hardware and software of the measuring system is described in detail.Test data shows that changing temperature has an important effect on the measurement of the dissolved oxygen. The method of which the hardware is simple solves the problem of temperature drift of the sensor effectively,and achieves good performance,and reduces the cost of the measurement and control system.
【CateGory Index】: TP274.4
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