Institute of Electrical Engineering and Electronics, Division of Metrology and Optoelectronics, Poznan University of Technology, Piotrowo street 3a, 60 - 965 Poznan, Poland
A. Szlachta
Department of Metrology and Measurement Systems, Rzeszow University of Technology, W. Pola street 2, 35 - 959 Rzeszow, Poland