Particle characterization in highly concentrated suspensions by ultrasound scattering method

作者：Weser R; Woeckel S^*; Hempel U; Wessely B; Auge J

来源：Sensors and Actuators A: Physical , 2013, 202: 30-36.

DOI：10.1016/j.sna.2013.02.027

• Ultrasound scattering
• Particle characterization
• Suspension
• Statistical evaluation

A method for inline characterization of randomly moving particles in high concentrated suspensions by measuring the back-scattered ultrasonic signals is described. Instead of the single amplitude signal the statistical features of multiple consecutive scattered sound waves are used that represent the scattering amplitude and its decrease over time. Those simple parameters, deduced from the signal, correlate with the particle size and concentration and deliver equivalent information like the attenuation calculated by conventional extinction measurements for particle characterization. For empirical validation of this assumption by two samples, the exponential decrease of the standard deviation was compared with the attenuation measured with a transmission-mode ultrasonic spectrometer. Especially the dependency for high particle concentration is shown. To provide a high spatial resolution and range - in case of media with high attenuation - ultrasonic sensors with a high bandwidth and intensity are used.

• 出版日期2013-11-1