Ultrasonic flowmeter and ultrasonic flow rate measuring method

Details Ultrasonic flowmeter and ultrasonic flow rate measuring method Ultrasonic flowmeter and ultrasonic flow rate measuring method

2006-07-11

2006-07-11

Patel, Harshad (Department: 2855)

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

C073S861280

Reexamination Certificate

active

07073395

ABSTRACT:
An ultrasonic flowmeter of the present invention includes: first and second ultrasonic transducers that send and receive an ultrasonic wave and are arranged so as to form a propagation path for the ultrasonic wave in a flow path of fluid; a transmission unit and a reception unit that drive the first ultrasonic transducer and the second ultrasonic transducer such that the ultrasonic wave is sent and received in two ways between the first ultrasonic transducer and the second ultrasonic transducer, and receive the ultrasonic wave; a zero-cross detection unit that measures a propagation time of the ultrasonic wave by subjecting a received signal generated by the ultrasonic wave received in the reception unit to zero-cross detection; and a correction unit that reduces an error in the zero-cross detection caused by noise superimposed on the received signal, in which the ultrasonic flowmeter calculates a flow volume of the fluid on the basis of the propagation time.

REFERENCES:
patent: 3894431 (1975-07-01), Muston
patent: 4483202 (1984-11-01), Ogura et al.
patent: 5123286 (1992-06-01), Baumgartner
patent: 5277070 (1994-01-01), Dorr
patent: 2001-116599 (2001-04-01), None
patent: 2001-317975 (2001-11-01), None
patent: 2002-071411 (2002-03-01), None
EP-03769993 Search Report of Mar. 3, 2006.

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