Acoustic cross-correlation flowmeter for solid-gas flow
First Claim
1. Apparatus for measuring particle velocity in a solid-gas flow within a pipe having a wall made of a material capable of propagating an ultrasonic signal therein comprising:
- first and second transmitting transducers positioned at first and second locations, respectively, along the pipe, said first and second transmitting transducers being directly connected to the wall of said pipe to develop first and second ultrasonic signals in said pipe wall said first and second ultrasonic signals being modulated by noise from particle impingment;
an acoustic decoupler, positioned between said first and second transmitting transducers, for acoustically isolating said first and second modulated ultrasonic signals from one another;
first and second detecting transducers directly connected to the wall of said pipe for detecting said first and second modulated ultrasonic signals respectively and for generating first and second output signals respectively in response to said first and second detected modulated ultrasonic signals; and
means for cross-correlating said first and second output signals.
1 Assignment
0 Petitions
Accused Products
Abstract
Apparatus for measuring particle velocity in a solid-gas flow within a pipe includes: first and second transmitting transducers for transmitting first and second ultrasonic signals into the pipe at first and second locations, respectively, along the pipe; an acoustic decoupler, positioned between said first and second transmitting transducers, for acoustically isolating said first and second signals from one another; first and second detecting transducers for detecting said first and second signals and for generating first and second detected signals in response to said first and second detected signals; and means for cross-correlating said first and second output signals.
42 Citations
11 Claims
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1. Apparatus for measuring particle velocity in a solid-gas flow within a pipe having a wall made of a material capable of propagating an ultrasonic signal therein comprising:
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first and second transmitting transducers positioned at first and second locations, respectively, along the pipe, said first and second transmitting transducers being directly connected to the wall of said pipe to develop first and second ultrasonic signals in said pipe wall said first and second ultrasonic signals being modulated by noise from particle impingment; an acoustic decoupler, positioned between said first and second transmitting transducers, for acoustically isolating said first and second modulated ultrasonic signals from one another; first and second detecting transducers directly connected to the wall of said pipe for detecting said first and second modulated ultrasonic signals respectively and for generating first and second output signals respectively in response to said first and second detected modulated ultrasonic signals; and means for cross-correlating said first and second output signals. - View Dependent Claims (2, 3, 4, 5, 6)
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7. Apparatus for measuring particle velocity in a solid-gas flow within a pipe having a wall made of material capable of propagating an ultrasonic signal therein, comprising:
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an oscillator for generating an input signal; first and second transmitting transducers coupled to said oscillator and directly connected to the wall of the pipe at first and second locations, respectively, along the pipe, said first and second transmitting transducer acting to develop first and second ultrasonic signals, respectively in the wall of said pipe, said first and second ultrasonic signals being modulated by noise from particle impingment; an acoustic decoupler for acoustically isolating said first and second modulated ultrasonic signals from one another, positioned between said first and second transmitting transducers; first and second detecting transducers directly connected to the wall of said pipe for detecting said first and second modulated ultrasonic signals, respectively, and for generating first and second output signals, respectively, in response to said first and second detected modulated ultrasonic signals; means for mixing said input signal with said first and second outpout signals; and means for cross-correlating said mixed first and second output signals. - View Dependent Claims (8, 9, 10)
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11. A method of measuring particle velocity in a solid-gas flow within a pipe having a wall made of a material capable of propagating an ultrasonic signal therein comprising the steps of:
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transmitting first and second ultrasonic signals into the wall of the pipe with transducers directly coupled to the pipe wall at first and second locations, respectively, along the pipe, said first and second signals being modulated by noise from particle impingment; acoustically isolating said first and second modulated ultrasonic signals from one another; detecting said first and second transmitted modulated ultrasonic signals with transducers directly connected to the pipe wall; generation first and second output signals in response to said first and second detected modulated ultrasonic signals; and cross-correlating said first and second output signals.
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Specification