基于TDR测量技术, 精确测量不同剖面下土壤含水量、电导率与温度
概览
SoilVUE™ 10 是一款基于Campbell TrueWave™ TDR 测量技术的土壤剖面水分传感器。它集土壤水分、电导率与温度测量为一体，是专为从事环境研究的科研人员和环境监测网络而研制。SoilVUE ™ 10 体现了土壤水分原位测量技术的创新和进步，是土壤剖面水分等状况监测的最佳选择。
Campbell Scientific 专有的TrueWave ™ TDR 技术将业内领先的信号上升时间与先进的波形分析技术相结合，从而准确确定高频信号的真实传输时间。测量过程将获取高时间分辨率和平滑的信号，其性能完全可以与其它TDR测量相媲美。值得一提的是，并非所有的TDR 的传感器都可以达到这样的测量性能。
优势与特点
- Measures VWC, permittivity, EC, and temperature
- Six or nine depths measured with one sensor
- Quick and low-impact installation
- Digital output is compatible with most Campbell Scientific data loggers
- Designed for long-term outdoor operation
- TrueWave TDR technology is proven and trusted
图像
技术说明
SoilVUE ™ 10 将6 个或者9 个三探针TDR 电极复合到传感器的整体螺纹结构中，这一独特设计能够有效地改善传感器与土壤之间的接触，尽可能地避免由空气间隙导致的测量误差。测量时，传感器内部的TDR 测量电路将产生一个具有陡峭上升沿的阶跃电压信号（信号上升时间为91ps），并加载到螺旋形的TDR 波导上。之后，传感器将通过TDR 信号沿波导往返的信号传输时间来确定波导周围介质的介电常数，并进一步结合混合模型来计算土壤体积含水量。
SoilVUE ™ 10 土壤剖面水分传感器仅需要预先用土钻打好5cm 的圆孔（较传感器直径稍小），然后再将传感器旋入即可。安装过程不需要使用其它任何挖掘设备或者昂贵的专用工具。
传感器自带的线缆包含一个IP67 防护等级的M12 接头。线缆损坏时，可以在现场断开接头、快速更换线缆。
产品规格
| Measurements Made | Volumetric water content (VWC), permittivity, electrical conductivity (EC), and temperature |
| Operating Temperature Range | -40° to +60°C |
| Maximum Installation Torque | 54 N m (40 ft⋅lb) |
| Operating Voltage Range | 9 to 36 Vdc |
| Diameter |
|
| Maximum Cable Length | 304.8 m (1,000 ft) |
| Length | 0.55 m/1.05 m (21.5 in./41.2 in.) depending on the option ordered |
| Weight | 1.9 kg/3.6 kg (4.2 lb/7.9 lb) depending on the option ordered |
Current Drain |
|
| Active | ~64 mA (@ 12 Vdc) |
| Quiescent | ~1.5 mA (@ 12 Vdc) |
Measurement Depths |
|
| 0.5 m Option | 5, 10, 20, 30, 40, and 50 cm (2, 4, 8, 12, 16, and 20 in.) |
| 1 m Option | 5, 10, 20, 30, 40, 50, 60, 75, and 100 cm (2, 4, 8, 12, 16, 20, 24, 30, and 40 in.) |
Electrical Conductivity |
|
| Range | 0 to 10 dS/m |
| Accuracy |
|
Relative Dielectric Permittivity |
|
| Range | 1 to 80 |
| Accuracy | ±1 permittivity unit (between 4 and 42 permittivity) |
Volumetric Water Content |
|
| Range | 0 to 100% |
| Water Content Accuracy |
±1.5% typical with most soils Soils with high organic matter (> 12% soil organic carbon) or high clay content (> 45% clay) may need a soil-specific calibration due to the dispersive nature of these materials. |
Soil Temperature |
|
| Accuracy | ± 0.15°C (between -30° and +40°C) |
相关技术文档
技术论文
视频与教程
下载
SoilVue 10 Example Program v.1 (1 KB) 03-12-2020
This example CR6 program collects the volumetric water content, relative permittivity, soil temperature, and bulk electrical conductivity for each depth of a 0.5 m SoilVue 10 probe.
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