A wideband ultrasonic test system for characterisation of particulate systems in the linear and non-linear regimes

C.G. Benny, A. Gachagan, G. Hayward, A. Nordon, D. Littlejohn

Research output: Contribution to conferencePaper

Abstract

This paper describes the development, characterisation and application of a versatile acoustic test cell for the derivation of through-transmission and backscattered ultrasonic signals from particulate suspensions. The test cell comprises a chamber for the
mixture within a larger water tank, with fixtures for ultrasonic transducers at either end of the tank. The mixing chamber has wideband membrane hydrophones at the entrance and exit of the acoustic path. A range of broadband ultrasonic transmitters permits operation over the excitation frequency range 150 kHz – 10 MHz. Importantly, this configuration permits detection of the fundamental operating frequency and its sub- and superharmonics for both backscatter and through-transmission measurements from a single transducer excitation. The methodology employs coded excitation waveforms in the form of wideband chirps coupled with matched filtering of the received waveforms to enhance SNR and time resolution, and extract specific spectral information. For the linear analysis, through-transmission signal amplitudes provide a measure of attenuation and arrival times determine acoustic velocity. Spectral content of
backscattered signals is used to identify non-linear characteristics, which are analysed for information related directly to the mixture properties. The particulate systems evaluated were glass beads, biomedical contrast agents and Avicel. Results have been achieved when operating in the linear regime, which compare well with published data, and with good scatterers in the non-linear regime, to which preliminary characterization of particle concentration has been applied.

Conference

ConferenceInternational Congress on Ultrasonics
CountryAustria
CityVienna
Period9/04/0713/04/07

Fingerprint

ultrasonic tests
particulates
ultrasonics
broadband
transducers
waveforms
chambers
superharmonics
excitation
fixtures
signal transmission
acoustics
hydrophones
chirp
cells
acoustic velocity
beads
entrances
transmitters
arrivals

Keywords

  • versatile acoustic test cell
  • through-transmission
  • backscatter
  • wideband reception

Cite this

Benny, C.G. ; Gachagan, A. ; Hayward, G. ; Nordon, A. ; Littlejohn, D. / A wideband ultrasonic test system for characterisation of particulate systems in the linear and non-linear regimes. Paper presented at International Congress on Ultrasonics, Vienna, Austria.4 p.
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abstract = "This paper describes the development, characterisation and application of a versatile acoustic test cell for the derivation of through-transmission and backscattered ultrasonic signals from particulate suspensions. The test cell comprises a chamber for the mixture within a larger water tank, with fixtures for ultrasonic transducers at either end of the tank. The mixing chamber has wideband membrane hydrophones at the entrance and exit of the acoustic path. A range of broadband ultrasonic transmitters permits operation over the excitation frequency range 150 kHz – 10 MHz. Importantly, this configuration permits detection of the fundamental operating frequency and its sub- and superharmonics for both backscatter and through-transmission measurements from a single transducer excitation. The methodology employs coded excitation waveforms in the form of wideband chirps coupled with matched filtering of the received waveforms to enhance SNR and time resolution, and extract specific spectral information. For the linear analysis, through-transmission signal amplitudes provide a measure of attenuation and arrival times determine acoustic velocity. Spectral content of backscattered signals is used to identify non-linear characteristics, which are analysed for information related directly to the mixture properties. The particulate systems evaluated were glass beads, biomedical contrast agents and Avicel. Results have been achieved when operating in the linear regime, which compare well with published data, and with good scatterers in the non-linear regime, to which preliminary characterization of particle concentration has been applied.",
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author = "C.G. Benny and A. Gachagan and G. Hayward and A. Nordon and D. Littlejohn",
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A wideband ultrasonic test system for characterisation of particulate systems in the linear and non-linear regimes. / Benny, C.G.; Gachagan, A.; Hayward, G.; Nordon, A.; Littlejohn, D.

2007. Paper presented at International Congress on Ultrasonics, Vienna, Austria.

Research output: Contribution to conferencePaper

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T1 - A wideband ultrasonic test system for characterisation of particulate systems in the linear and non-linear regimes

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AU - Gachagan, A.

AU - Hayward, G.

AU - Nordon, A.

AU - Littlejohn, D.

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AB - This paper describes the development, characterisation and application of a versatile acoustic test cell for the derivation of through-transmission and backscattered ultrasonic signals from particulate suspensions. The test cell comprises a chamber for the mixture within a larger water tank, with fixtures for ultrasonic transducers at either end of the tank. The mixing chamber has wideband membrane hydrophones at the entrance and exit of the acoustic path. A range of broadband ultrasonic transmitters permits operation over the excitation frequency range 150 kHz – 10 MHz. Importantly, this configuration permits detection of the fundamental operating frequency and its sub- and superharmonics for both backscatter and through-transmission measurements from a single transducer excitation. The methodology employs coded excitation waveforms in the form of wideband chirps coupled with matched filtering of the received waveforms to enhance SNR and time resolution, and extract specific spectral information. For the linear analysis, through-transmission signal amplitudes provide a measure of attenuation and arrival times determine acoustic velocity. Spectral content of backscattered signals is used to identify non-linear characteristics, which are analysed for information related directly to the mixture properties. The particulate systems evaluated were glass beads, biomedical contrast agents and Avicel. Results have been achieved when operating in the linear regime, which compare well with published data, and with good scatterers in the non-linear regime, to which preliminary characterization of particle concentration has been applied.

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