2018 Physics/Theoretical Colloquium

 

Thursday, October 4th, 2018

3:45 – 4:45 p.m.

Rosen Auditorium (TA-53, Bldg. 1)

Refreshments at 3:15pm

 

Speaker:   Cristian Pantea

MPA-11

Los Alamos National Laboratory

 

“Low-Frequency Acoustic Collimated Beam”

 

Abstract: 

 

In recent years, we have developed a variety of unique acoustic sources that can generate a highly collimated acoustic beam (very low beam spread) of low frequency (10-250 kHz) without any side lobes. An acoustic beam with the above characteristics is extremely important, and leads to deeper penetration, due to low frequency, and increased lateral resolution, due to collimation. These novel acoustic sources are based on frequency mixing in nonlinear medium, linear array superposition, generation of Bessel-like acoustic beams through radial modes of piezo disks, etc. These sources were used extensively for wellbore integrity monitoring and fracture detection on simulated boreholes in the laboratory.

 

A few different approaches of generating a Low-Frequency Collimated Beam, along with potential applications will be discussed.