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TDR Probes Table of Contents

B. Correcting Electrical Conductivity Measurements for

System Losses ...........................................................B-1

B.1 Description of Method ........................................................................ B-1

B.2 Detailed Method Description .............................................................. B-2

B.2.1 Collecting Reflection Coefficient with Probes Open

and Shorted ....................................................................................... B-2

B.2.2 Determining K

.......................................................................... B-2

B.2.3 Deriving Calibration Function................................................... B-3

B.2.4 CR1000 Program for Collection ρ

open

and ρ

shorted

Values .......... B-4

List of Tables

3-1. TDR Probe Physical Properties .............................................................. 2

3-2. TDR Probe Measurement Properties...................................................... 2

A-1. Dielectric permittivity values for range of temperatures ................... A-5

B-1. Standard KC1 Solutions..................................................................... B-2

List of Figures

5-1. Waveforms collected in a sandy loam using CS610 probe

with RG8 connecting cable. Volumetric water content is 24% and

bulk electrical conductivity is 0.3 dS m

-1

................................................... 5

5-2. Waveforms collected in a sandy loam using CS610 probe

with RG8 connecting cable. Volumetric water content values are

10, 16,18, 21 and 25%. Solution electrical conductivity is 1.0 dS m

-1

........

5-3. Waveforms collected in a sandy loam using CS610 probe

with RG8 connecting cable. Volumetric water content values are

10, 18, 26, 30 and 37%. Solution electrical conductivity is 10.2 dS m

-1

.....

B-1. Example of corrected and uncorrected electrical

conductivity values................................................................................. B-3

1 2 3 4 5 6 7 8 9 ... 25 26

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Campbell TDR Specifiche Pagina 4