ekS - Instytut Agrofizyki im. Bohdana DobrzaÅskiego PAN w Lublinie ...

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For compatibility reasons it uses the same probes as the ones developed some years ago and used in many research laboratories all over the world [29]. The meter has memory capable to store about 1000 data points that can be labelled for identification. The operation of the meter is by a five-pushbutton keypad that controls the display by means of user-friendly software. A small lithium-polymer rechargeable battery commonly used in mobile telephones supplies the device. It can be optionally equipped with the Global Positioning System (GPS) for giving longitude and latitude coordinates of the meter for localization. This feature is fundamental in application in precision agriculture Fig. 58. Prototype of a handheld soil water content, salinity and temperature meter constructed with the application of modern components New version has the following features: 123
• accuracy and resolution not worse than FOM/mts from Easy Test,light handheld enclosure, • ability to register and store up to 1000 labelled readings, • real time clock, • operates with Easy Test TDR probes with different cable lengths (from 1.5 to 9.5 m), • keyboard and LCD display (160x128 dots) with user friendly operating software, • optionally equipped with GPS module for localization, • connection by USB interface with PC compatible computer for data transfer, • lithium-polymer (without memory effect enabling charging at any time) battery supply. 12.3. TDR Data LOGger for soil water content, temperature and salinity measurements Fig. 59. An example of the D-LOG/10/mts-controlled stand incorporating six D-MUX/10/mts 2- nd level multiplexers. Maximum amount of the controlled FP/mts (or FP/m) probes is 60. For clarity only a single D-MUX was linked with the D-LOG and a single probe was connected to each D-MUX when taking the picture 124
Page 2 and 3:
TDR METHOD FOR THE MEASUREMENT OF W
Page 4 and 5:
PREFACE The importance of water for
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CONTENTS 1. Status of water as an s
Page 8 and 9:
12.2. New prototype version of FOM/
Page 10 and 11:
that stimulate the phenomena and pr
Page 12 and 13:
The solution to the problem of elec
Page 14 and 15:
3. ELECTRICAL MEASUREMENTS METHODS
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v = c 1 2L = = ( θ ) n ∆t ε (2)
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The TDR probe consists of two waveg
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ε a =1 and φ=0.5 the Eq. (10) has
Page 22 and 23:
The experiment description is given
Page 24 and 25:
Results obtained with the discussed
Page 26 and 27:
Notice that at C s = 0, ie when dis
Page 28 and 29:
water orientation polarization [s],
Page 30 and 31:
Fig. 8. Frequency dispersion of the
Page 32 and 33:
The measurements were performed in
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5. EVALUATION OF DIELECTRIC MIXING
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ε α = ∑V α iε i (29) i where
Page 38 and 39:
where SAND and CLAY are percents of
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Below the transition value, the soi
Page 42 and 43:
To verify the observations concerni
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6. TEMPERATURE EFFECT ON SOIL DIELE
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chamber and the freezer, only one w
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The user interface on the main comp
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soil sample volumetric water conten
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close vicinity of the analyzed obje
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process of measurement is non-destr
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dielectric permittivity change caus
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The values of the refractive index
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The relative, ∆n/∆T, and absolu
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Fig. 25. The temperature effect on
Page 64 and 65:
The temperature effect of TDR soil
Page 66 and 67:
The purpose of the above discussion
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( ,25 + T )( 45 + T ) 49 9 f rel =
Page 70 and 71:
8. THE ACCURACY OF SOIL WATER CONTE
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gravimetric method and the soil ref
Page 74 and 75: where: a 0 ÷ a 6 are coefficients
Page 76 and 77: values of p F calculated for the re
Page 78 and 79: eason of this is the fact that wate
Page 80 and 81: 9 ∆θ = 0,2 ⋅10 ⋅ ∆t = 0.00
Page 82 and 83: values of θ rel for lower values o
Page 84 and 85: 9. COMPARISON OF OPEN-ENDED COAX AN
Page 86 and 87: ε" = EC ε d " + (82) 2π fε wher
Page 88 and 89: dielectric permittivity, the dielec
Page 90 and 91: The applied lumped capacitance mode
Page 92 and 93: stainless steel wires soldered to t
Page 94 and 95: ε’ Open Coax and ε b-TDR , exce
Page 96 and 97: − − The difference of the imagi
Page 98 and 99: Integrated Circuit) recently introd
Page 100 and 101: 10.2. Electromechanical microwave s
Page 102 and 103: RF1. Two PIN diodes in series in ea
Page 104 and 105: The significant aspect of the proto
Page 106 and 107: visible for lower values of soil el
Page 108 and 109: In the TDR method the signal propag
Page 110 and 111: description of functional and techn
Page 112 and 113: MASTER modules are wireless transce
Page 114 and 115: time the Real Time Clock module wak
Page 116 and 117: ase station distinguishes A SLAVE d
Page 118 and 119: sensor, format the data received fr
Page 120 and 121: 12. SOIL WATER STATUS MONITORING DE
Page 122 and 123: D-LOG/mpts is a moisture/pressure/t
Page 126 and 127: D-LOG/mts (Fig. 59) is a TDR (Time-
Page 128 and 129: 12.4. FP/m, FP/mts - Field Probe fo
Page 130 and 131: inside of a separate polyethylene b
Page 132 and 133: differential water capacity and the
Page 134 and 135: − maximum number of LP/p probes t
Page 136 and 137: 12.7. LP/t - Laboratory Probe for s
Page 138 and 139: From the collected data set, after
Page 140 and 141: 25. de Loor G.P.: Dielectric proper
Page 142 and 143: TDR. Symposium on Time Domain Refle
Page 144 and 145: 100. Whalley W.R.: Considerations o
Page 146 and 147: Fig. 14. Fig. 15. Fig. 16. Fig. 17.
Page 148 and 149: Fig. 38. The three-rod TDR probe -
Page 150 and 151: Fig. 67. A set of LP/ms and LP/p LO
Page 152: Table 17. An example of the executa
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