shown may additionally be necessary due to the large distance from the roll surface 12 b the laser vibrometer 22 may be located without problem in the area of the machine center that is in the area of the longitudinal center of roll 12 in this area the vibration of the roll 12 leads to very strong swings of the roll surface 12 b thereby permitting a very precise measurement of the vibrations of roll 12 another type of sensor for measuring the vibrations of roll 12 are the compression and or tension sensitive elements 28 which are illustrated in fig1 and which are located on the interior surface 12 c fig2 of the roll shell 12 d the compression and or tension sensitive elements 28 may for example take the embodiment of conventional wire strain gauges it is however also possible to utilize any other type of compression and or tension sensitive elements films or similar devices since a single one of these elements 28 is able to detect measure the vibrations of the roll 12 only at a certain point of the roll it is advantageous to place a multitude of these compression and or tension sensitive elements 28 around the circumference of the roll 12 as indicated in fig1 over a section of the interior circumference of the roll 12 the detection measurement signals of the elements 28 are again transmitted to the control unit 24 via signal.