A Grazing Flow Impedance Facility For Engine Nacelle Acoustic Liners

Acoustic liners remain the standard for providing a method to reduce environmental noise from aircraft engine nacelles. To aid in their development, facilities are required that are capable of accurately educing the acoustic impedance in the presence of mean flow. The Grazing Impedance Tube at NASA LaRC possesses these capabilities and was donated to the University of Florida. Improvements have been made to enable optical flow diagnostics, provide an increased speed range, and reduce turbulence levels. This facility provides a testbed to improve upon current liner impedance eduction methods as well as facilitate development of novel design approaches and studies into fundamental liner flow physics.

Grazing Flow Impedance Tube Profile

Metric Value
Dimensions 2" x 2"

Maximum Mach Number

 0.6
Maximum SPL

130 dB @ Ma = 0.5

IMG Seminar: Microvalve on Plastic Microfluidic Device

Submitted by IMG System Admin on Fri, 06/18/2010 - 12:34am
Event date: 
Fri, 06/18/2010 - 3:00pm to 4:00pm

Microfluidics is a rapidly expanding field and microfluidic devices are used in many different areas including biotechnology, chemical analysis and medicine. Microvalves are often one of the building blocks required to complete a successful microfluidic device. They carry out a variety of functions including containing fluids, regulating flows, and isolating one region from another in a microfluidic system.

Dr. Xie's Company, WiOptix, Reaches "Final Four" of Cade Prize Competition

Submitted by IMG System Admin on Fri, 06/11/2010 - 8:31am

The Cade Prize for Innovation, a new competition designed to recognize Florida inventors, has promoted Dr. Xie's company, WiOptix, to its "Final Four."  The WiOptix entry, "In Vivo Noninvasive Optical Endoscopic Imaging for Early Cancer Diagnosis," will be pitched to a panel of nationally recognized judges on Friday, June 11th.  If selected, WiOptix will receive a $50,000 cash prize and one year of in-kind support. Best of luck to Dr. Xie and the other WiOptix representatives, Martin Wynkoop, Lei Wu, and Shuguang Gu!

IMG Seminar: Special measurement techniques

Submitted by IMG System Admin on Thu, 06/10/2010 - 3:43pm
Event date: 
Fri, 06/11/2010 - 3:00pm to 4:00pm

Device and circuit characterization is one of the routine tasks that most IMG students will face. Some of the characterization procedures become very challenging because of equipment limitations. For example, the parameter being measured is out of the range of available equipments, or the equipment does not have the functionality to create conditions required by the measurement.

In this talk, three basic techniques are discussed to help solve some of the common problems. They are: