STANDARDS

ISO 20998-1 2006: Measurement And Characterization Of Particles By Acoustic Methods — Part 1: Concepts And Procedures In Ultrasonic Attenuation Spectroscopy

ISO 20998-2:2013: Measurement And Characterization Of Particles By Acoustic Methods — Part 2: Guidelines For Linear Theory

PUBLICATIONS

TWEEDIE, R.J., HIGGS, D.M.J., ALBA, F., 1998, The Measurement of Sub-micron Particle size distributions in concentrated suspensions by Acoustic Spectroscopy, Measuring Particle Size at High Concentration, IFPRI Report (SAR 12-25), (Eds Scarlett, B., Merkus, H.G.,) IFPRI

MOUGIN P., WILKINSON D., ROBERTS K., TWEEDIE R., 2001; Characterisation of particle size and distribution during the crystallisation of organic fine chemical products and measured in situ using ultrasonic attenuation spectroscopy, J. Acoust. Soc. Am. 109, 274-282.

MOUGIN P.M.J., THOMAS A., WILKINSON D., WHITE G., ROBERTS K.J., HERRMANN N., JACK R., TWEEDIE R., 2003, On-line monitoring of a crystallization process, AIChE J,49, 373-378.

LI, M., WILKINSON, D., PATCHIGOLLA, K., MOUGIN, P., ROBERTS K.J., TWEEDIE, R., 2004, On-Line Crystallization Process Parameter Measurements Using Ultrasonic Attenuation Spectroscopy, Crystal Growth & Design, 4, 955-963.

VILAR, G., WILLIAMS, R.A., WANG, M., TWEEDIE, R.J.;2008 On Line Analysis of Structure Dispersions in an Oscillatory Baffled Reactor (OBR) using Electrical Impedance Tomography (EIT), Chemical Engineering Journal. 141 (2008) 58–66

LI, R., PENCHEV, R.Y., RAMACHANDRAN, V., ROBERTS, K.J., WANG, X.Z., TWEEDIE, R.J.; PRIOR, A.J., GERRISTEN, J.W., HUGEN, F.MParticle shape characterisation via imago analysis: from laboratory studies to in-process measurements using an in situ particle viewer system, Organic Process Research & Development, 2008 vol. 12, pp.837-849

WANG, XZ; LIU, LD; LI, RF; TWEEDIE, RJ; PRIMROSE, K; CORBETT, J; MCNEIL-WATSON, FK, 2009 Online characterisation of nanoparticle suspensions using dynamic light scattering, ultrasound spectroscopy and process tomography Chem Eng Res Des, 87, p874-884

WANG, X.Z., LIU, L., LI, R.F., TWEEDIE, R.J., PRIMROSE, K., CORBETT, J., MCNEIL-WATSON, F., 2009 Online monitoring of nanoparticle suspensions using dynamic light scattering, ultrasound spectroscopy and process tomography, Comp .Aided. Chem. Eng., v26, p351-356,

LI, R.F., LIU, L., WANG, X.Z., TWEEDIE, R.J., PRIMROSE, K., CORBETT, J., MCNEIL-WATSON, F., 2009 Multivariate Statistical Control of Emulsion and Nanoparticle Slurry Processes Based on Process Tomography, Dynamic Light Scattering, and Acoustic Sensor Data Comp .Aided. Chem. Eng., v 27, p1317-1322.

B BOONKHAO, RF LI, XZ. WANG, RJ TWEEDIE, K., Primrose. Making use of process tomography data for multivariate statistical process control”, 2011) AIChE Journal, 57(9), 2360-2368

L. LIU, R. F. LI, S. COLLINS, X. Z. WANG, R. TWEEDIE , K. PRIMROSE. Ultrasound Spectroscopy and Electrical Resistance Tomography for Online Characterisation of Concentrated Emulsions in Crossflow Membrane Emulsifications. Powder Technology. 2011 July; 213: 123-131.

R.E. Challis, J.H. Chamberlain and B.H. Smaill. A simply constructed system for mean blood flow measurement. J. Biomed. Eng. 4, 153-154, 1982.

R.E. Challis and J.A. Harrison. Rapid Solutions to the Transient Response of Piezoelectric Elements by z-transform techniques. J. Acoust. Soc. Amer., 74, 1673 1680, 1983.

R.E. Challis and J.A. Harrison. Transmission circuits for thick transducer ultrasound transmission test system. Ultrasonics 22, 103-109, 1984.

J.A. Harrison, G.N. Cook-Martin and R.E. Challis. Radiation Coupling between two co-axial disks of different diameter; an exact solution and detailed experimental verification. J. Acoust. Soc. Am. 76, 1009-1022, 1984.

R.E. Challis and A.K. Holmes. Acoustic absorption in L-cysteine solutions at physiological pH and temperature measured using a novel technique. J. Chem. Soc. Faraday Trans. 2. 85 (2), 845-856, 1989.

R.E. Challis, J.A. Harrison, A.K. Holmes and R.P. Cocker. Digital Signal Processing applied to Ultrasonic Absorption Measurements. Ultrasonics, 28, 5-15, 1990.

R.E. Challis, J.A. Harrison, A.K. Holmes and R.P. Cocker. A wide bandwidth Spectrometer for Rapid Ultrasonic Absorption Measurements in Liquids. J. Acoust. Soc. Am. 1991. 90(2), 730-740, 1991.

R.E. Challis, T. Alper, A.K. Holmes and R.P. Cocker, Near-plane-wave acoustic propagation measurements in thin layers of adhesive polymer. Meas. Sci. Technol., 2, 59-68, 1991.

R.E. Challis, T. Alper, R.P. Cocker and J.D.H. White. Ultrasonic absorption and velocity dispersion measurements in thin adhesive layers. Ultrasonics, 29, 22-28, 1991.

R.E. Challis, R.P. Cocker, A.K. Holmes and T. Alper. Visco-elasticity of thin adhesive layers as a function of cure and service temperature measured by a novel technique. J. Appl. Polymer Sci, 44, 65-81, 1992.

A.K. Holmes and R.E. Challis. Acoustic absorption in the dipeptide glycyltyrosine and its significance to the ultrasonic absorption of proteins at physiological pH. J. Chem. Soc. Faraday Transactions, 88(3), 443-447, 1992.

R.E. Challis, A.K. Holmes and D.J. Wedlock. Wide bandwidth measurements of ultrasound velocity and attenuation in polystyrene suspensions. Non-destr. Test. Eval. 10, 55-65, 1992.

A.K. Holmes, R.E. Challis and D.J. Wedlock. A wide bandwidth study of ultrasound velocity and attenuation in suspensions: comparison of theory and experimental measurements. J. Colloid and Interface Science, 156, 261-268, 1993.

R.E. Challis. T. Alper, R.J. Freemantle, G. Crean, and D. Zhang. Acoustic wave velocities in ceramics and other materials by a broadband goniometric method. Rev. Sci. Inst. 64(5) 1271-1273, 1993.

A.K. Holmes and R.E. Challis. Ultrasonic scattering in concentrated colloidal suspensions. Colloids and Surfaces, 77, 65-74, 1993.

31. R.J. Freemantle, T. Alper and R.E. Challis. A model fitting approach to the broadband measurement of ultrasonic wave velocities in thin samples of engineering material, Meas. Sci. Technol, 4, 1129-1137, 1993.

A.K. Holmes, R.E. Challis, and D.J. Wedlock. A wide-bandwidth ultrasonic study of suspensions: the variation of velocity and attenuation with particle size. J. Coll. and Int. Sci., 168, 339-348, 1994.

R.E. Challis and R.P. Cocker. Ultrasonic compression wave propagation in adhesive polymers described as a signal filtering process. Ultrasonics, 33(4), 311-319, 1995.

J.S. Tebbutt and R.E. Challis. On the physical acoustics of colloidal mixtures. Acoustics Bulletin, 20(4), 5-10, 1995. ISSN 0308-437X.

R.E. Challis, R.J. Freemantle, J.D.H. White and G.P. Wilkinson. Ultrasonic compression wave NDT of adhered metal lap joints of uncertain dimensions. Insight (J. of British Institute of NDT), 37(12), 954-963, 1995. ISSN 1354-2575.

R.E. Challis, R.J. Freemantle, J.D.H. White and G.P. Wilkinson. Ultrasonic compression wave NDT of adhered metal lap joints of uncertain dimensions. Insight, 37, 954-963, 1995.

R. Balasubramanyam, D. Quinney, R.E. Challis and C.P.D. Todd. A finite difference simulation of ultrasonic Lamb waves in metal sheets with experimental verification. J. Phys. D., 29, 147-155, 1996.

R.P. Cocker and R.E. Challis. A study of ultrasonic wave propagation through parallel arrays of immersed tubes. J. Sound and Vibration, 193(5), 1049-1068, 1996.

A.K. Holmes and R.E. Challis. Acoustic absorption due to proton transfer in solutions of proteins, peptides and amino acids at neutral pH. J. Acoust. Soc. Am., 100(3), 1865-1877, 1996.

J.S. Tebbutt and R.E. Challis. Ultrasonic wave propagation in colloidal suspensions and emulsions: a comparison of four models. Ultrasonics, 34, 363-368, 1996. ISSN 0041-624X.

R.E. Challis, R.J. Freemantle, G.P. Wilkinson and J.D.H. White. Compression wave NDE of adhered metal lap joints: uncertainties and echo feature extraction. Ultrasonics, 34, 315-319, 1996. ISSN 0041-624X.

R.E. Challis, U. Bork and C.P.D. Todd. Ultrasonic NDE of adhered T-joints using Lamb waves and intelligent signal processing. Ultrasonics, 34, 455-459, 1996. ISSN 0041-624X.

R.E. Challis, R.P. Cocker and A.K. Holmes. The effects of fillers on wide bandwidth ultrasonic pulse propagation in adhesives. Ultrasonics, 34, 355-361, 1996. ISSN 0041-624X.

J.C. Austin, A.K. Holmes, J.S. Tebbutt and R.E. Challis. Ultrasonic wave propagation in colloidal suspensions and emulsions: recent experimental results. Ultrasonics, 34, 369-374, 1996. ISSN 0041-624X.

D.J. Hibberd, A.K. Holmes, M. Garrood, A. Fillery-Travis, M.M. Robins and R.E. Challis. Ultrasonic monitoring of oil-in-water emulsions during depletion flocculation. J. Coll. and Int. Sci., 193, 77-87, 1997.

R.P. Cocker, D.L. Chadwick, D.J. Dare and R.E. Challis. A low resolution NMR and ultrasound study to monitor the cure of epoxy resin adhesives. Int. J. Adhesion and Adhesives,18, 319-331, 1998.

R.E. Challis, A.K. Holmes, J.S. Tebbutt and R.P. Cocker. Scattering of ultrasonic compression waves by particulate fillers in a cured epoxy continuum. J. Acoust. Soc. Am., 103, 1413-1420, 1998.

R.E. Challis, G.P. Wilkinson, and R.J. Freemantle. Errors and uncertainties in the pulse-echo reflectometry method for measuring acoustic impedance. MST, 9, 692-700, 1998.

R.J. Freemantle and R.E. Challis. Combined compression and shear wave ultrasonic measurements on curing adhesive. MST 9(8), 1291-1302, 1998.

J.C. Austin and R.E. Challis The effects of flocculation on the propagation of ultrasound in dilute kaolin slurries. J. Coll. Int. Sci., 206, 146-157, 1998.

R.E. Challis, J.S. Tebbutt and A.K. Holmes. Equivalence between three scattering formulations for ultrasonic wave propagation in particulate mixtures. J. Phys. D., Appl. Phys., 31(24), 3481-3497,1998.

C.P.D. Todd and R.E. Challis. Quantitative classification of adhesive bondlines using Lamb waves and artificial neural networks. IEEE Trans. UFFC, 46,167-181,1999.

J.S. Tebbutt, T. Marshall and R.E. Challis. Monitoring of crystallisation phenomena by ultrasound. Electronics Letters, 35(1), 90-91,1999.

J.S. Tebbutt, T. Marshall and R.E. Challis. The monitoring of copper(II) sulphate pentahydrate crystallisation using ultrasound. Langmuir, 15, 3356-3364, 1999.

A.K. Holmes and R.E. Challis. Ultrasonic wave propagation in sols and gels. Langmuir, 15, 3045-3049, 1999.

A.K. Holmes and R.E. Challis. The applicability of acoustic wave propagation models to silica sols and gels. J. Coll. and Int. Sci., 216, 50-58, 1999.

J.C. Austin and R.E. Challis, Ultrasonic propagation through aqueous kaolin suspensions during degassing. Ultrasonics, 37, 299-302, 1999.

J.C Austin and R.E. Challis, The detection of structural transformations in kaolin suspensions by ultrasound. J. Coll. and Int. Sci., 220, 6-12, 1999.

M.J.S. Lowe, R.E. Challis and C.W. Chan. The transmission of Lamb waves across adhesively bonded lap joints. J. Acoust Soc. Am., 107, 1333-1345, 2000.

R.E. Challis, R.J. Freemantle, R.P. Cocker, D.L.Chadwick, D.J. Dare, C.M. Martin, A. Mendrasingham, and W. Fuller. Ultrasonic measurements related to the evolution of structure in curing epoxy resins. Plastics, Rubber and Composites, 29, 109-118, 2000.

T. Marshall, J.S. Tebbutt and R.E. Challis. Monitoring the crystallisation from solution of a reactive dye by ultrasound. MST, 11, 509-517, 2000.

T.J. O’Neill, J.S. Tebbutt and R.E. Challis. Convergence criteria for scattering models of ultrasonic wave propagation in suspensions of particles. IEEE Trans. UFFC, 48, 419-424, 2001.

S.D. Aston, R.E. Challis and G.P. Yiasemides. Density mapping of ceramic tiles by compression wave ultrasound. Nondestructive Testing and Evaluation, 17, 263-273, 2001.

S.D. Aston, R.E. Challis and G.P. Yiasemides. The dependence of the elastic properties of a silica/alumina system on the conditions used for firing. J. Eur. Ceram. Soc., 22(7), 1119-1127, 2002.

T.Marshall, R.E. Challis, A.K. Holmes and J.S. Tebbutt. Modeling ultrasonic compression wave absorption during the seeded crystallisation of copper (II) sulphate pentahydrate from aqueous solution. IEEE Trans. UFFC. Vol 49, No 11,pp 1583-1591, 2002, ISSN 0885-3010.

Y.K. Thong, M.S. Woolfson, J.A. Crowe, B.R. Hayes-Gill and R.E. Challis. Dependence of inertial measurements of distance on accelerometer noise. Meas.Sci.Technol., vol 13, pp 1163-1172, 2002.

R.E. Challis, M.E. Unwin, D.L. Chadwick, R.J. Freemantle, I.K. Partridge, D.J. Dare, and P.I. Karkanas. Following network formation in an epoxy/amine system by ultrasound, dielectric and NMR measurements. J. Appl. Poly. Sci., vol 88, pp1665-1675, 2003.

A N Kalashnikov and R E Challis. New architectures for feedthrough SAW recursive devices. IEEE Trans. UFFC, vol 52(1) , pp 120-126, 2005.

A N Kalashnikov, R E Challis, M E Unwin and A K Holmes. Effects of frame jitter in data acquisition systems. IEEE Trans. Instr. Meas., vol , pp , 2005.

A N Kalashnikov and R E Challis. Errors and uncertainties in the measurement of ultrasonic wave attenuation and phase velocity. IEEE Trans. UFFC, vol 52(10), pp 1754-1768, 2005.

R.E. Challis, M J W Povey, M L Mather and A K Holmes. Ultrasound techniques for characterising colloidal dispersions. Reports on Progress in Physics, vol 68, pp 1541-1637, 2005.

A K Holmes, J Laybourn-Parry, J D Parry, M E Unwin and R E Challis. Ultrasonic imaging of biofilms utilizing echoes from the biofilm/air interface. IEEE Trans UFFC, vol, pp, 2005.