Method for calibrating a thz measuring apparatus, thz measuring method and corresponding thz measuring apparatus

Abstract

The invention relates to a method for calibrating a THz measuring apparatus (), in particular a pipe, on a measurement object (), comprising at least the following steps: providing a THz measuring apparatus () having a plurality of pivotable THz sensors (), arranged in a circumferential direction around a measuring chamber (), for outputting one THz transmitted beam () each along a sensor axis (B) (provision step); orienting the THz sensors () into a starting position in the measuring chamber () in which the measurement object () is received (orientation step in starting position); allocating the THz sensors () to at least one first and one second sensor group (group formation step); first calibration adjustment step, in which the second sensor group is adjusted as an adjustment group by means of the first sensor group as a starting group, and corresponding second calibration adjustment step, in which the first sensor group is adjusted as an adjustment group by means of the previously calibration-adjusted second sensor group as a starting group; wherein, in each of the calibration adjustment steps=by means of the THz sensors (S, S, S, S) of the starting group, spacing points on a surface () of the measurement object () are determined, =sensor correction angles of the THz sensors (; S, S, S, S) of the adjustment group are determined by means of the spacing points determined by the starting group, and =the THz sensors of the adjustment group are calibration-adjusted about the determined sensor correction angles (a).