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The influence of the geometric size and complex capacitance measurement error on the dielectric spectrum measurement errors of contact and non-contact methods was theoretically analyzed, and the two errors were compared. The influence of electrode gap distance and dielectric constant of sample on the dielectric spectrum measurement errors was simulated and analyzed. On the basis of dielectric spectra of high temperature vulcanized silicone rubber obtained by dielectric spectrometer, the influence of measurement errors of the geometric size (sample thickness) on the accuracy of measurement results for contact and non-contact methods was analyzed. The results show that the non-contact method is much more affected by the measurement accuracy of the geometric size and complex capacitance than the contact method, and it has high requirement on the instrument accuracy and is easier to produce significant errors than the contact method. With the increase of relative dielectric constant of the sample, the measurement error of relative dielectric constant by non-contact method dramatically increases and then gradually becomes stable. When the relative dielectric constant of the sample is no more than 5, with the increase of electrode gap distance, the measurement error of the relative dielectric constant dramatically increases. The non-contact method is suitable for the occasion with high measurement accuracy of the geometric size and dielectric constant.
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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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