Ultrasonic Pulsed Doppler, a Novel Method for Nanoparticle Characterization


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USPD is a unique ultrasonic backscatter technology for the characterization of nanoparticles. Particles are interrogated in motion and the backscattered energy is received at Doppler-shifted frequencies, allowing clutter-free detection of backscatter from particles in the sub-ten to 100 nm range. For sizing, particles are set into motion by high intensity interrogation ultrasound itself with velocities correlated with size and the backscatter power spectrum is converted to a Particle Size Distribution (PSD). This process is less labor intensive and expensive than TEM and has advantages over legacy optical methods. Employing only a single small transducer, USPD systems can be incorporated into existing process equipment. Other advantages include measurement at high concentrations and with opaque solutions and better size resolution than with many conventional instruments. USPD can also measure concentration and flow fields with high spatial resolution.

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Journal: TechConnect Briefs
Volume: TechConnect Briefs 2019
Published: June 17, 2019
Pages: 33 - 36
Industry sector: Advanced Materials & Manufacturing
Topics: Advanced Materials for Engineering Applications, Materials Characterization & Imaging
ISBN: 978-0-9988782-8-7