## 2 Experimental, Semi-Industrial Setup  
The idea of the experimental system for wet fiber tape drying is presented in Figure 1. Selected views of its practical realization are shown in Figure 2. Within the system of guides ensuring transport and moistening of the web, four main functional subsystems can be distinguished: an induction-heated rotating steel cylinder with HF generators, a tape dryness measurement system, a surface temperature imaging system and a temperature and a dryness control system. The control system is fed by both measurement subsystems, yielding an output signal for the HF generators such that both a single dryness control loop and cascade control can be achieved.  
The most crucial parts of the setup are shown in Figure 3. The induction heating system constitutes the main part. As discussed in Section 3, to ensure flexibility in forming the surface temperature distribution, the inductors have to be able to generate heating power in any area of the cylinder. Therefore, the inductors must be capable of independent movement above and along the axis of the cylinder surface. The inductors (2) are mounted on individual carriages (3) arranged in two sections, ensuring symmetry with respect to the generatrix of the cylinder axis (4). The trolleys are mechanically connected to each other by means of guides (5), which stabilize their movement along the cylinder length using a pull ball screw (7). The screws are driven individually by servos (6). A schema of the subsystem is shown in Figure 3.  
Figure 1: Schematic diagram of the system for the automatic drying of wet fiber tape.  
Figure 2: General view of the actual drying stand (**a**). Side view of the dryness meter and moving inductors heating the cylinder (**b**).  
Since, under real working conditions, the inductors can be in permanent movement for long periods of time, a robust power supply is needed. For this purpose, a dedicated wireless power supply system was developed, as shown in Figure 4. This solution uses an intermediate transformer (IT) with a stretched primary winding (PWS), connected to an inverter (INV) giving a current of 20 kHz frequency. The winding, which is arranged along the forming cylinder, is fixed, while the transformer core (IT), which is mechanically and electrically connected to the inductor, moves on a specially constructed trolley (SP). In any position of the transformer core, electricity is transferred through the IT transformer from the inverter to the inductor.  
The measuring sub-system is equipped with a microwave moisture meter and a thermal imaging camera. The moisture meter consists of two antennas, one of which (the emitter) emits microwave radiation that is partially absorbed by water molecules contained in the fibrous tape. The second antenna (the receiver) receives the unabsorbed part of the signal, thus measuring the humidity (or degree of dryness) of the tape. Both antennas are  
Figure 4: Electrical diagram of the wireless power supply for moving the inductors. IT—transformer core; SP—specially constructed trolley; PWS—primary winding; INV—hf inverter; IND—inductor; MC—matching condenser.  
Figure 3: Schema of the motive system of the inductors along the axis of the cylinder.  
movable, so the humidity of the entire tape can be scanned systematically. An infrared camera (A615 by Flir) is used to measure the temperature distribution over the visible part of the cylinder surface, based on which the temperature distribution along the generatrix of the cylinder is determined. An measurement example is shown in Figure 5a,b.