Noise silencer and method for use with an ultrasonic meter
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Mar 18, 2003
Grant Date -
Feb 20, 2003
app pub date -
Dec 19, 2000
filing date -
Dec 19, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A silencer for use with ultrasonic meters to reduce stray ultrasonic noise that could cause measurement inaccuracies. The silencer comprises a tubular body having at least two baffles spaced apart from one another. The baffles are preferably formed of an open-cell, reticulated metal foam material that absorbs noise in the ultrasonic range of frequencies under high-pressure operating conditions. The silencer is a reasonable flow conditioner and can be mounted directly to the meter without disturbing the flow. The silencer reduces the level of ultrasonic stray noise by absorption. Ultrasonic noise waves are partially reflected between the baffles and along their length as the waves move between baffles. With each reflection, the baffle material absorbs energy that is lost by friction in the pores of the foam material. Through this process of the ultrasonic waves being reflected and the noise being incrementally absorbed, the energy of the ultrasonic wave is attenuated.
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