Patent ID: 8590384

Claim:
A vibration sensor arrangement ( 1 ), comprising: (a) a piezoelectric element ( 2 ) with a first side ( 3 ) and a second side ( 4 ); (b) a vibrating mass ( 5 ) which is in permanent mechanical contact with the first side ( 3 ) of the piezoelectric element ( 2 ), said vibrating mass ( 5 ) comprising a water-proof capsule ( 6 ) in which the piezoelectric element ( 2 ) is fixed; (c) a dead weight ( 7 ) which is in permanent mechanical contact with a second side ( 4 ) of the piezoelectric element ( 2 ) and which is arranged in said water-proof capsule ( 6 ); (d) a spring ( 8 ) which is arranged between the dead weight ( 7 ) and the vibrating mass ( 5 ) and which ensures the permanent mechanical contact of the two masses ( 5 , 7 ) with the two sides ( 3 , 4 ) of the piezoelectric element ( 2 ), such that it presses the two masses ( 5 , 7 ) constantly against the two sides ( 3 , 4 ) of the piezoelectric element ( 2 ); and (e) first and second electric contacts ( 9 , 10 ) for picking up electric signals which are generated by said piezoelectric element ( 2 ) and for forwarding said signals to a recording device ( 11 ) which is or can be connected with the electric contacts ( 9 , 10 ) and which is arranged for recording the electric signals generated by the piezoelectric element ( 2 ), the first electric contact ( 9 ) having an insulation layer on its backside, being arranged between the piezoelectric element ( 2 ) and the dead weight ( 7 ), and providing the mechanical contact between the dead weight ( 7 ) and the piezoelectric element ( 2 ), wherein the vibration sensor arrangement ( 1 ) is embodied in a portable way, and wherein the dead weight ( 7 ) inside the water-proof capsule ( 6 ) comprises at least one electric battery ( 12 ) such that said dead weight ( 7 ) is arranged as a power supply for the operation of said recording device ( 11 ), said at least one electric battery ( 12 ) being connected or connectable via electric conductors ( 13 , 14 ) with said recording device ( 11 ).