Method and apparatus for detecting a signal

Details Method and apparatus for detecting a signal Method and apparatus for detecting a signal

1996-10-04

1997-06-17

Dougherty, Elizabeth L.

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

7386127, G02F 166

Patent

active

056399715

ABSTRACT:
A method of detecting a signal (50) in an ultrasonic flow meter sets a first threshold (52) and a second threshold (54) at a predetermined level above the first threshold (52). An ultrasonic signal (50) having a plurality of cycles is then received. Next it is determined when the ultrasonic signal (50) exceeds the first threshold (52). This time is marked a first threshold time. Then it is determined when the ultrasonic signal exceeds the second threshold (54). This time is marked a second threshold time. A time difference between the first threshold time and the second threshold time (56) is determined. When the time difference (56) exceeds a delta time, increasing the first threshold (52) a delta level.

REFERENCES:
patent: 4538469 (1985-09-01), Lynnworth et al.
patent: 4542656 (1985-09-01), Johnson
patent: 4583410 (1986-04-01), O'Neil
patent: 4633719 (1987-01-01), Vander Heyden
patent: 4708022 (1987-11-01), Johnson
patent: 4922750 (1990-05-01), Magori
patent: 5035147 (1991-07-01), Woodward

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