The Research Of Micro TDR Soil Moisture Sensor Influencing Factors And The Establishing Of Its Application Model

In this paper, as RV-1 type TDR soil moisture sensor an object, measuring soil temperature, soil quality, soil salinity and moisture content and impact of soil bulk density of the sensor output voltage, measuring environmental impact electrical properties of the soil moisture sensor and the sensor itself features analysis. Xi'an silty loam, Hami loamy sand and Shanshan sandy loam influence of soil on the TDR sensor output voltage, establishing the mathematical model, and the model is validated. The conclusion is as follows:(1)Soil temperature, soil bulk density, soil salinity and soil moisture have significant effect on the moisture content of the test results TDR soil moisture sensor. Soil temperature, salinity and density values higher moisture sensor output voltage. Effects of soil moisture sensor output voltage for the primary and secondary factors: the quality of soil moisture, soil salinity, soil temperature, soil bulk density.(2)The sensor output voltage and the actual soil moisture, temperature, soil bulk density and soil moisture available four elements quadratic equation, verification results show that the established model fit to calculate the output voltage and the actual measurement voltage representing high, it can be used to measure the sensor.(3)The reasonable range sensor power supply voltage sensing range of 8 to 18 v, the sensor is broadside 6cm, narrow 5cm, no significant effect on the environment field sensors, plexiglass material has no significant effect on the sensor readings, the sensor tip sensing distance of 11 cm.(4)Sensor creep amount is ± 1.4%, zero drift amount of ± 0.52%, the same batch of the same type of sensor maximum difference amount 0.015 v, odds ratio was 2.94%, a good identity sensor, the sensor accuracy of ± 0.5%, the sensor the three forms of the basic characteristic curve fitting piecewise fit best.