Microwave scanning apparatus

摘要

A method and apparatus for detecting grain direction in wood by means of microwave radiation. A sample of timber is exposed to a polarized microwave beam emitted by a transmitter (11). A polarized receiver (12) evaluates the microwave energy that has been affected by the timber. The receiver and transmitter polarization planes are locked at either 0 or 90 degrees respect to each other. Both are rotated synchronously and the received energy is plotted versus angle. The energy maximum or minimum gives indication of the grain direction in the timber sample under evaluation.