SENSING PROBE FOR SENSING A PARAMETER OF THE GROUND AT A CERTAIN DEPH, METHODS FOR PLACING AND USING SUCH PROBES

摘要

A sensing probe senses a parameter of the ground at a certain depth. The probe comprises an elongate body with a tip as a leading end for entering the ground and a head as a trailing end. The head is shaped such that a force can be exerted on the body in an inserting direction from the head towards the tip to insert the body into the ground to a desired depth. The elongate body comprises one or more electrodes electrically connectable, at a predetermined position of the body, to a portion of ground which, when the probe is entered into the ground, is adjacent to the body at the predetermined position. Inside the probe an electronic circuit is integrated, which is connectable to a power source. The circuit has a DC current source or sink connected to the electrode for establishing a current path through the portion of the ground, through which a DC current flows which monotonically changes the charge in the DC current source or sink. A signal generator generates a signal representing the sensed parameter. The signal generator is connected to the current path to determine from an aspect of the monotonic change the sensed parameter. The signal can be outputted via an output of the circuit.