Contactless determining a physical feature of a target item

A system for contactless determining a physical feature of a target item, the system comprising a terahertz scanner unit, a detector unit and a determiner unit;

• the terahertz scanner unit is configured to perform an operation according to a relative position between the target item and the terahertz scanner unit, the operation including emitting a terahertz scanning radiation onto the target item and measuring an interaction radiation caused by interaction of the terahertz scanning radiation with the target item;
• the detector unit includes one or more vibration measurers couplable to a supporting system configured to support or hold the target item or to a positioning system configured to position the terahertz scanner unit in or at the relative position, so as to measure vibrations at the supporting system or the positioning system as part of a condition potentially distorting the operation of the terahertz scanner unit;
• the determiner unit is configured to determine the physical feature of the target item depending on the interaction radiation measured by the terahertz scanner unit and the condition potentially distorting the operation of the terahertz scanner unit measured by the detector unit.