Data processing: measuring – calibrating – or testing – Measurement system – Dimensional determination
Reexamination Certificate
2007-11-20
2007-11-20
Raymond, Edward (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system
Dimensional determination
C324S222000
Reexamination Certificate
active
11591854
ABSTRACT:
In an ultrasonic flow meter for measuring a flow rate of a fluid flowing through a conduit by detecting a propagating time difference between a forward propagating time of an ultrasonic wave propagating within the conduit in a forward direction and a backward propagating time of an ultrasonic wave propagating within the conduit in a backward direction, forward and backward ultrasonic wave signals generated by ultrasonic vibrating elements are sampled to derive forward and backward digital data series x and y, which are stored in a memory, the forward and backward digital data series x and y are read out of the first and second memory units and total sums of absolute difference values between the forward and backward digital data series x and y are calculated, while data positions of these backward and forward digital data series x and y are relatively shifted, a shift amount of data positions at which a total sum of absolute difference values becomes minimum is detected, an ultrasonic propagating time difference is derived in accordance with the detected shift amount of data positions, a flow speed of the fluid within the conduit is derived from the ultrasonic wave propagating time difference, and a flow rate of the fluid flowing through the conduit is derived in accordance with the flow speed and a known cross sectional area of the conduit.
REFERENCES:
patent: 7069793 (2006-07-01), Ishikawa et al.
patent: 2002-162269 (2002-06-01), None
patent: 2002-243514 (2002-08-01), None
Sasaki Tadao
Sugi Tokio
Raymond Edward
Tokyo Keiso Co., Ltd.
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