MEASURING APPARATUS AND METHOD FOR MEASURING A HOLE IN THE GROUND

摘要

The invention relates to a measuring apparatus (1) for measuring a hole (3) in the ground. This measuring apparatus has at least one measurement probe (10) that can be lowered into the hole and that has at least one measurement signal transmitter (12) for transmitting a measurement signal and at least one measurement signal receiver (14) for receiving the measurement signal reflected at a wall region (5) of the hole. The measuring apparatus further has an evaluation unit for determining a wall distance between the measurement signal transmitter and the wall region of the hole, the received reflected measurement signal being able to have a measurement distance associated with it on the basis of an association rule. There is further provision for a calibration device that is connected to the measurement probe and that has at least one calibration element (22). The measurement signal transmitter is designed to transmit a calibration signal that is reflectable at the calibration element, the measurement signal receiver being designed to receive the calibration signal reflected at the calibration element. The evaluation unit is designed to change and calibrate the association rule on the basis of the calibration signal reflected and received from the calibration element.