Patent ID: 7289917

Claim:
A coriolis flow meter, comprising: at least one measuring tube, which is excited to oscillate during measurement operation, and through which a medium flows, whose flow is to be measured; first and second sensors for registering a flow-dependent oscillation of said measuring tube and for producing first and second sensor signals; a reference signal generator, which superimposes a reference signal on the second sensor signal; a first signal processing branch, which, on the basis of said first sensor signal and an auxiliary signal formed by the superimposing of said reference signal on said second sensor signal, derives and conditions a first signal corresponding to a difference of said first sensor signal and said auxiliary signal; a second signal processing branch, which, on the basis of said auxiliary signal or on the basis of said first sensor signal and said auxiliary signal, derives and conditions a second signal; two sets of, in each case, two filters, of which a first set serves for filtering from said conditioned first signal a conditioned, first, reference signal and a first measurement signal corresponding to a difference of said sensor signals and of which a second set serves for filtering from said conditioned, second signal a conditioned second reference signal and a second measurement signal; means, which determine, on the basis of said first and second, conditioned, reference signals, a ratio of the gains of said first and second signal processing branches; and means for determining flow on the basis of said first and second measurement signals, and on the basis of said ratio of the gains.