US 5,627,326 AGranted

Coriolis type apparatus for measuring mass flow of a fluid stream

AssigneeMMG Automatika Muvek Reszvenytarsasag

InventorsJozsef Alesz, Imre Busznyak, Istvan Glodi, Andras Kiss, Jozsefne Kukta, Bela Nagy, Peter Salamon, Elemer Szentpeteri, Zoltan Toth, Tamas Ujhelyi

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Abstract

A Coriolis type apparatus for measuring mass flow of a fluid stream, comprising at least one flow conduit which is oscillated at a resonant frequency transverse to the direction of flow while said fluid flows therethrough, two sensors for generating analog signals corresponding to the motion of the flow conduit, and signal processing means for determining time difference between said analog signal, said signal processing means including means for converting said analog signals into series of digital signals and means to compute from said series of digital signals said time difference by using Fourier transformation. Each of the analog signals generated by the sensors is converted into a series of digital signals by an incremental type analog-digital converter having a comparator, an up-down counter and a digital-analog converter.

Claims4

Dependent claims

A Coriolis type apparatus for measuring mass flow of a fluid stream, comprising:

at least one flow conduit which is oscillated at a resonant frequency transverse to the direction of flow while said fluid flows therethrough, two sensors for generating two analog signals corresponding to the motion of said flow conduit, two incremental type analog-digital converters for converting said analog signals into series of digital signals, each of said incremental type analog-digital converters comprising a comparator, an up-down counter and a digital-analog converter,
a common clock signal source for driving said up-down counters of said two incremental type analog-digital converters,
means for computing from said series of digital signals a value corresponding to a time difference between said analog signals by using Fourier transformation,
controlled latches for forwarding said series of digital signals to said computing means, and control means for controlling said latches in synchronism with at least one of said analog signals.

1 more element

Dependencies are inferred from the claim text.