VIBRATORY TRANSDUCER

摘要

A vibratory transducer for a fluid flowing in a pipe comprising a curved flow tube for conducting the fluid. The flow tube communicates with the pipe via an inlet-side tube section and an outlet-side tube section. An antivibrator is mechanically connected with the flow tube by means of a first coupler on the inlet side and by means of a second coupler on the outlet side. During operation of the transducer flow tube and antivibrator oscillates in opposition of phase. For driving flow tube and antivibrator the transducer comprising an excitation system and for sensing inlet-side and outlet-side vibrations of the flow tube the transducer comprising a sensor system. An internal system formed by at least said flow tube, said antivibrator, said excitation system, and said sensor system, oscillating about a longitudinal axis of the transducer which is essentially in alignment with the inlet-side tube sections, forces a torsion of the first and second couplers about the longitudinal axis and an essentially torsional elastic deformation of at least parts of the inlet--side and outlet-side tube sections. In order to achieve a torsionally soft oscillation of the internal system, at least the first coupler, tuned to a torsional rigidity of the inlet-side tube section, and at least the second coupler, tuned to a torsional rigidity of the outlet-side tube section, are so dimensioned that an inlet-side inherent torsion eigenmode of the first coupler and of the inlet-side tube section has a natural frequency approximately equal to the excitation frequency, and an outlet-side inherent torsion eigenmode of the second coupler and of the outlet-side tube section has a natural frequency essentially equal to the natural frequency of the inlet-side inherent torsion eigenmode.