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SMT100土壤温湿度传感器是德国TRUEBNERS公司生产的一款低成本、高质量传感器，其原理是利用环形振荡器将信号的传输时间转换为测量频率，产生的频率>100MHz足以在粘性土壤中正常工作。SMT100结合了低成本FDR传感器的优点和TDR传感器的精度。与TDR一样，它测量信号的传播时间，以确定土壤的介电常数，像FDR一样，它把介电常数转换成一个易于测量的频率。提供SDI-12、RS485?-10V和Modbus多种输出方式，可满足广大客户的需求、/span>
应用范围９/span>
气象、农业、土壤、温室、植物秸秆水分测量、土壤侵蚀、堆肥水分测量、积雪水分温度测量、土木绿化、多元化灌溉等领埞/span>
技术指标：
水分范围９/span>0-60% VWC＇/span>Max?00百分VWC（/span>
分辨率：0.1% VWC或者更髗/span>
精度９/span>3％VWC工厂校准@?-50%VWC矿物土盐刅/span>~8ds/m
1％VWC@土壤特定校准
温度范围９/span>-40~+80
分辨率：0.01ℂ/span>
精度：典垊/span>0.2℃@-20~+50℃； 其它0.4ℂ/span>
介电常数９/span>1（空气）~80（水（/p>
分辨率：0.01
响应时间９/span>50us
供电９/span>4-24V DC
电流９/span>40mA
信号输出：数字：RS485?/span>Modbus?/span>SDI-12
模拟:0 - 10 V
线缆长度９/span>10m
尺寸９/span>18.2 cm x 3 cm x 1.2 cm
Characteristics of the three types of soil moisture sensors used in the SOMOMOUNT network. All values in the table are provided by the manufacturers (Delta-T Devices 2008; IMKO 2015; Truebner 2016).
Aragones J. L. MacDowell L. G. and Vega C.: Di-electric Constant of Ices and Water: A Lesson about Water Interactions J. Phys. Chem. A 115 5745?758＋/p>
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Barthlott C. Hauck C. Schaedler G. Kalthoff N. and Kottmeier，C.: Soil moisture impacts on convective indices and pre- cipitation over complex terrain Meteorol. Z. 20 185?97＋/p>
2011.
Beltrami H.: Active layer distortion of annual air soil thermal orbits Permafrost Periglac. 7 101?10 (SICI)1099- 1530(199604)7:2<101::aid-ppp217>3.3.CO;2-3 1996.
Beringer J. Lynch A. H. Chapin F. S. Mack M. and Bonan G. B.: The Representation of Arctic Soils in
the Land Surface Model: The Importance of Mosses J. Climate 14 3324?335 0442(2001)014<3324:troasi>2.0.CO;2 2001.
Bircher S. Skou N. Jensen K. H. Walker J. P. and Rasmussen L.: A soil moisture and temperature network for SMOS valida- tion in Western Denmark Hydrol. Earth Syst. Sci. 16 1445 1463 2012.
Bogena H. R. Herbst M. Huisman J. A. Rosenbaum U. Weuthen A. and Vereecken H.: Potential of Wireless Sensor Networks for Measuring Soil Water Content Variability Vadose Zone J. 9 1002?013 2010.
Bogena H. R. Huisman J. A. Schilling B. Weuthen A. and Vereecken H.: Effective Calibration of Low-
Cost Soil Water Content Sensors Sensors 17 208＋/p>
2017.
Boike J. Wille C. and Abnizova A.: Climatology and sum- mer energy and water balance of polygonal tundra in the Lena River Delta Siberia J. Geophys. Res-Biogeo. 113 G03025＋/p>
2008.
Borga M. Boscolo P. Zanon F. and Sangati M.: Hydrom- eteorological Analysis of the 29 August 2003 Flash Flood in the Eastern Italian Alps J. Hydrometeorol. 8 1049?067＋/p>
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2007.
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