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Eskelinen, P. & Eskelinen, H. 2000. A K-band microwave measuring system for the analysis of tree stems. Silva Fennica 34(1): 37-45. The internal structure of growing trees and freshly cut logs can be characterized in real time by analysing the transmission and reflection of Ku-or K-band microwave energy injected with a horizontal polarization towards the material. Information about the moisture content, material bends, number and location of knots and sections of spoiled wood e.g. due todoi:10.14214/sf.643 fatcat:ernismj6w5axrlbcbga34wjslq