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In order to improve the accuracy of relative permittivity measurement by means of non-contact method, we built a corresponding model by electric field finite element analysis and obtained the distribution of electric field and potential of the electrode and around. The edge effect of electrode was analyzed and its influences on the measuring result of relative permittivity were investigated. In addition, the influence of potential factors on the measuring error of non-contact method was analyzed, and then the factors which should be taken into consideration in the correction was confirmed, which were the electrode gap distance, the ratio of sample thickness to electrode gap distance, and the relative permittivity. The results show that the measuring error of relative permittivity increases with the increase of electrode gap distance and relative permittivity of the sample, while decreases with the increase of the ratio of sample thickness to electrode gap distance. Under the model with the electrode gap distance of 0.2-5 mm, the ratio of sample thickness to electrode gap distance of 0.5-1, the relative permittivity of 1-20, 2 380 groups of actual and calculated values of relative permittivity are obtained, and the relative error is -0.37%--41.72%. According to the above relationship among the electrode gap distance, the ratio of sample thickness to electrode gap distance, the measured value and real value of relative permittivity, the measured relative permittivity is then corrected by the 3D interpolation method and matching method. The correction method is verified by simulation and is used to correct the measured relative permittivity of high temperature vulcanized silicone rubber. The results validate the proposed method.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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