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Contact method and non-contact method are two commonly used methods to measure relative dielectric constant of polymer films, and the electrode edge effect is one of the unavoidable errors in the measurement process. However, the error caused by the electrode edge effect is difficult to quantify. In order to solve this problem, COMSOL simulation software was used to model and simulate the three-electrode structure, and the errors caused by the electrode edge effect in the contact method and the variable capacitance method of non-contact method were obtained and compared respectively. The results show that the electrode edge effect of the variable capacitance method is much greater than that of the contact method. Taking the edge effect less than 0.50% as the standard, when the film thickness is less than 40 μm, the electrode edge effect of the contact method can be ignored, while for the variable capacitance method, only the film thickness is less than 30 μm, the electrode edge effect can only be ignored.
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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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