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| Titel: |
Relationship between the impedance of a multi-pin probe and soil water content |
| Auteur: |
Sun Yurui Kromer K.H. |
| Verschenen in: |
International agrophysics |
| Paginering: | Jaargang 17 (2003) nr. 1 pagina's 35-40 |
| Jaar: |
2003 |
| Inhoud: |
Based on the theory of the impedance-transform of transmission line, a mathematical model for calculating the impedance of a soil probe with a multi-pin structure was developed. It is found that the impedance of the multi-pin probe may be turned into an inductive-reactance from a capacitive-reactance and vice versa as measurement conditions change. Moreover, the formula for the impedance of a soil probe has a series of periodical discontinuous dots. Three necessary experiments to verify this model were conducted in a laboratory environment. By changing the measurement frequency (50�200 MHz), the length of the pin (5�15 cm) and the number of pins (2�5), some electric properties of the multi-pin probe were confirmed. As an application of the model, a prototype was designed and it achieved a measurement accuracy of volumetric soil water content within ą2% ranging from 0 to 50%. |
| Uitgever: |
Institute of Agrophysics |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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