Abstract: The present disclosure relates to a measuring system for measuring a measured object, in particular a plastic profile, said measuring system comprising: an antenna arrangement of THz transceivers each at times actively emitting a THz transmission beam and passively receiving reflected THz radiation, where said antenna arrangement outputs measuring signals of the measurements of the THz transceivers, an adjustment means for adjusting the antenna arrangement into several measuring positions along an adjustment direction, a control and evaluation device for receiving and evaluating the measuring signals which is configured such that the measuring signals are evaluated by means of a synthetic aperture radar evaluation process and a virtual model of the boundary surfaces of the measured object is created, and subsequently the control and evaluation device determines layer thicknesses between the boundary surfaces from the virtual model.

Abstract: The invention relates to a preferably portable THz measuring apparatus (1) for determining impurities (3) in a, in particular, stationary measured object (2), the THz measuring apparatus (1) comprising: an antenna array (4) including at least one active THz transmitter, e.g. transceiver (12), emitting a THz transmission beam (15) along an optical axis (A), and a plurality of THz receivers (14), arranged under a fixed spatial arrangement in relation to the THz transmitter (12) and synchronised with the THz receiver, detect reflected THz radiation (16) and putting out THz measuring signals (S1), a controller device (5), receiving the THz measuring signals (S1) and determining impurities (3) as reflections having occurred outside ordinary boundary surfaces (2a, 2b) of the measured object (2). Hereby, the THz-Receiver (14) may also transmit temporarily, in particular alternatingly.

Abstract: The invention relates to a wall thickness measuring device for pipes and the like, more particularly of extruded plastics, having a measuring head (15) connected to measuring and supply leads. The measuring head is mounted to be reversed around an opening of passage A for the pipe to be measured by means of a guide (14) attached to a frame having the opening of passage. The measure and supply leads (22-25) are acommodated in two guide chains (20, 21) which extend in opposite directions, partly on an inner guideway (18) and the other part on a guideway (19), connected thereto, of a guide core member (17). The guide core member (17) is basically constructed in the form of a portion of a circle and is disposed concentrically of the opening of passage (5) and can be moved therearound.