By Grigoriy I. Torgovnikov
Provided here's a accomplished treatise on all features of dielectric homes of wooden and wooden items. the themes coated comprise: interplay among electromagnetic box and wooden. - wooden composition and dielectric homes of its parts. - dimension of dielectric parameters of wood.- Dielectric homes of oven-dry wooden. - Dielectric houses of wet wooden. - impact of other different types of remedy on dielectric houses of wooden. - Dielectric houses of bark. - Dielectric homes of wood-based fabrics. - techniques for selection of dielectric parameters of wooden dependent fabrics and for his or her use in calculations. numerous appendices contain reference facts onthe dielectric features of wooden and wood-based fabrics within the wide selection of frequencies, temperatures, and moisture content.
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Dielectric Properties of Wood and Wood-Based Materials
Supplied here's a complete treatise on all points of dielectric homes of wooden and wooden items. the themes coated contain: interplay among electromagnetic box and wooden. - wooden composition and dielectric houses of its parts. - size of dielectric parameters of wooden. - Dielectric houses of oven-dry wooden.
Extra resources for Dielectric Properties of Wood and Wood-Based Materials
Sample text
The foil is-superimposed on the sample covered with silver paste and thoroughly rubbed to the sample surface to obtain a tight fit. A better method to achieve proper contact between the foil and the sample is described in the chapter dealing with the sample preparation process. Measuring devices for determining the dielectric parameters of materials at low frequencies are now being produced industrially. For the purpose of carrying out measurements at different temperatures, the industry manufactures speCial measuring chambers securing the specified stable temperature with deviations not exceeding ± 1°C.
Spark gaps are provided to protect the circuit in case of breakdown of the sample. 1) In order to read the indication directly, the scale of R3 should be calibrated in capacity units, and the scale of C 4 should be calibrated in the units of tg~. The dielectric loss tangent can be read directly from the instrument scale. When the instrument is not calibrated sufficiently, the value of tg~ can be calculated. 2) It is necessary to measure or to calculate the capacitance value of Co of the unit without the sample while preserving the geometrical dimensions.
014. 039 at 1011 Hz (Fig. 53 g/cm 3 ). 9 times (depending on the frequency). 34, the peak value being at 107 Hz (Fig. 53 g/cm 3 ). Specific values of the dielectric parameters of the cell wall in the frequency range from 102 to 1011 Hz at 20 DC and with the vector of electric field strength oriented in the transverse direction are given in Appendix 1. The DC of the cell wall increases with increasing temperature (Fig. 6a); the dependence is nearly linear. The dependence of the loss factor on the temperature at different frequencies is shown in Fig.