TDR-LAB 2.0 Improved TDR Software for Soil Water Content and Electrical Conductivity Measurements

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• 作者：E. Fat¨¢s ; J. Vicente ; B. Latorre ; F. Lera ; V. Vi?als ; M.V. L¨®pez ; N. Blanco ; C. Pe?a ; C. Gonz¨¢lez-Cebollada ; D. Moret-Fern¨¢ndez
• 关键词：Time Domain Reflectometry ; Software ; Waveform
• 刊名：Procedia Environmental Sciences
• 出版年：2013
• 出版时间：2013
• 年：2013
• 卷：19
• 期：Complete
• 页码：474-483
• 全文大小：1132 K

文摘

Time Domain Reflectometry is a technique widely used in hydrology and agronomy that allows real time estimation of soil volumetric water content (¦È), which is related to soil's apparent permittivity (?a) and bulk electrical conductivity (¦Ò). This work presents an enhanced release of TDR-Lab, software which controls instrumentation for field measurements of ¦È and ¦Ò, enabling a convenient recording and retrieving of data.

TDR-Lab 2.0 supports Tektronics 1502C, TDR-100 Campbell Sci. and TRASE Soil-moisture Equipment Corp., which can be connected to a multiplexing system (SDMX50, Campbell Sci) allowing automated scheduled measurements from up to 251 different probes. This new release, when connected to TDR-100, allows increasing the waveform accuracy up to 2048 points/waveform. Multiple comparison of TDR waveform within the same TDR screen is now allowed. Graphical or numerical methods can be used for the estimation of ¦È and ¦Ò from soil measurements coming taken with different probes. Additional features to carry out water-surface-level measurements such as matric potential and soil solution electrical conductivity are also available when measurements are made using the corresponding specific probes.

Two different versions, a lite and a full release, for field and laboratory applications have been developed. The light version with a reduced set of features (TDR-Lab Lite) was designed to run in low-end ultraportable devices. TDR- Lab Lite works with XML-files instead of the SQL database engine of the extended TDR-Lab, and has lower system requirements and a faster boot-up time. A robust import/export graphical user interface (GUI) facilitates transferring projects between the centralized SQL database and XML files. A new project manager window has been implemented, where the bar menu has been complemented with a useful set of icons. The display system projects has been improved and simplified. Within the project, a new friendly configuration manager for cables and TDR probes has been developed. Finally, an improved calibration procedure for TDR probes has been implemented.

TDR Lab 2.0 supports more devices and provides additional estimated features from soil's measurements. Besides, the low hardware requirement of TDR-Lab Lite facilitates faster in-the-field tests and measurements.