Microwave dielectric properties of horticultural peat products
The microwave dielectric properties of horticultural peat and compost peat were measured with a HP85107C network analyser in conjunction with a HP85070B open-ended coaxial dielectric probe for the frequency range 0.5–20 GHz. Loose samples had volumetric water contents ranging from 0.11 to 0.24 Mg m-...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
International Mire Conservation Group and International Peatland Society
2007-04-01
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| Series: | Mires and Peat |
| Subjects: | |
| Online Access: | http://www.mires-and-peat.net/map02/map_02_03.pdf |
| _version_ | 1797708182829662208 |
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| author | G. Ayalew N.M. Holden S.M. Ward |
| author_facet | G. Ayalew N.M. Holden S.M. Ward |
| author_sort | G. Ayalew |
| collection | DOAJ |
| description | The microwave dielectric properties of horticultural peat and compost peat were measured with a HP85107C network analyser in conjunction with a HP85070B open-ended coaxial dielectric probe for the frequency range 0.5–20 GHz. Loose samples had volumetric water contents ranging from 0.11 to 0.24 Mg m-3. For analysis, samples were compressed to 1.0× (no compression), 1.2×, 1.5× and 2.0× original bulk density, giving volumetric water contents ranging from 0.11 to 0.48 Mg m-3. The raw relative permittivity data exhibited a high degree of variability, but rank-based removal of outlier measurements helped to improve their coherence with volumetric water content. The difference between horticultural peat and compost peat was insignificant in terms of both the dielectric constant and the loss factor. The results suggest that relative permittivity data after the removal of outliers can be of sufficiently high quality for sensing applications in the horticultural peat industry such as dedicated water content monitoring, nutrient management, and foreign body detection systems for health and safety purposes, given the low-precision requirements that are appropriate for horticultural and compost peat as high-volume, low-value and non-critical commodities. |
| first_indexed | 2024-03-12T06:17:36Z |
| format | Article |
| id | doaj.art-548dd78f3bfa458b83b96c9f7ee18e08 |
| institution | Directory Open Access Journal |
| issn | 1819-754X |
| language | English |
| last_indexed | 2024-03-12T06:17:36Z |
| publishDate | 2007-04-01 |
| publisher | International Mire Conservation Group and International Peatland Society |
| record_format | Article |
| series | Mires and Peat |
| spelling | doaj.art-548dd78f3bfa458b83b96c9f7ee18e082023-09-03T02:24:48ZengInternational Mire Conservation Group and International Peatland SocietyMires and Peat1819-754X2007-04-01203110Microwave dielectric properties of horticultural peat productsG. AyalewN.M. HoldenS.M. WardThe microwave dielectric properties of horticultural peat and compost peat were measured with a HP85107C network analyser in conjunction with a HP85070B open-ended coaxial dielectric probe for the frequency range 0.5–20 GHz. Loose samples had volumetric water contents ranging from 0.11 to 0.24 Mg m-3. For analysis, samples were compressed to 1.0× (no compression), 1.2×, 1.5× and 2.0× original bulk density, giving volumetric water contents ranging from 0.11 to 0.48 Mg m-3. The raw relative permittivity data exhibited a high degree of variability, but rank-based removal of outlier measurements helped to improve their coherence with volumetric water content. The difference between horticultural peat and compost peat was insignificant in terms of both the dielectric constant and the loss factor. The results suggest that relative permittivity data after the removal of outliers can be of sufficiently high quality for sensing applications in the horticultural peat industry such as dedicated water content monitoring, nutrient management, and foreign body detection systems for health and safety purposes, given the low-precision requirements that are appropriate for horticultural and compost peat as high-volume, low-value and non-critical commodities.http://www.mires-and-peat.net/map02/map_02_03.pdfcompostgrowing mediumpermittivityrelative complex permittivitysoil additive |
| spellingShingle | G. Ayalew N.M. Holden S.M. Ward Microwave dielectric properties of horticultural peat products Mires and Peat compost growing medium permittivity relative complex permittivity soil additive |
| title | Microwave dielectric properties of horticultural peat products |
| title_full | Microwave dielectric properties of horticultural peat products |
| title_fullStr | Microwave dielectric properties of horticultural peat products |
| title_full_unstemmed | Microwave dielectric properties of horticultural peat products |
| title_short | Microwave dielectric properties of horticultural peat products |
| title_sort | microwave dielectric properties of horticultural peat products |
| topic | compost growing medium permittivity relative complex permittivity soil additive |
| url | http://www.mires-and-peat.net/map02/map_02_03.pdf |
| work_keys_str_mv | AT gayalew microwavedielectricpropertiesofhorticulturalpeatproducts AT nmholden microwavedielectricpropertiesofhorticulturalpeatproducts AT smward microwavedielectricpropertiesofhorticulturalpeatproducts |