APPARATUS AND METHOD FOR DETECTION OF RELATIVE RESISTIVITY

摘要

The invention relates to an apparatus and a method for detection of relative resistivity in objects, and more particularly for detection of wood decay in living trees. The apparatus comprises: a controllable constant current source (11); a pair of current delivering electrodes (2A; 2B) connected to the constant current source for delivering current to the object (7); a voltage meter (12); a pair of measurement electrodes (3) connected to the voltage meter and connectable to the object for measuring a voltage caused by the delivered current. The apparatus further comprises processor means (10) being connected to an input device (4) for receiving data relative to the diameter of the object; the processor means (10) being arranged to control the constant current source (11), and to evaluate the measurement result in dependence of the diameter of the object.