Campbell TDR Manuale Scaricare il pdf (Pagina 6)

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 Collecting ρ

open

and ρ

shorted

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

Figures

7-1. 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

7-2. 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

. ................. 6

7-3. 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

................. 6

A-1. Example of start of TDR probe determination ................................ A-2

B-1. Example of corrected and uncorrected electrical conductivity

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

Tables

5-1. TDR Probe Physical Properties ........................................................... 2

5-2. TDR Probe Measurement Properties................................................... 2

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

equation [A5]. .............................................................................. A-5

B-1. Standard KCl Solutions ................................................................... B-2

1 2 3 4 5 6 7 8 9 10 11 ... 27 28

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Campbell TDR Manuale Pagina 6