IMG Seminar: Overview of Micropillar Shear Stress Sensors

Event date: 
Fri, 08/13/2010 - 3:30pm to 4:00pm

This Friday, Jessica Sockwell will be giving a seminar on micropillar shear stress sensors. Micropillar shear stress sensors have been developed in recent years with the goal of attaining full-field shear stress measurements within turbulent boundary layers. This talk will explain how the sensors work, summarize the design and fabrication of these devices, highlight their strengths and weaknesses, and discuss how these sensors might be further improved for future use.

IMG Picosecond Laser Micromachining Workstation Online

Installation of an Oxford Lasers J-355PS Laser Micromachining Workstation has just been completed and the system is ready for use.  The tool is the first of its kind to be installed in the U.S., and provides a unique capability for IMG by enabling the machining of many different types of materials including sapphire and silicon, as well as other glasses and polymers. Purchase of this system was made possible by collaboration between Professors David Arnold and Mark Sheplak of IMG and Professor Tony Schmitz of UF's Machine Tool Research Center (MTRC).

Ultra-Miniature Power Management for Microsystem Platforms

High density passive components (inductors, transformers, capacitors) are developed and integrated with high frequency (100-500 MHz) CMOS switching power conversion circuits. The  mm3-scale integrated converter will be capable of delivering >20 V from a battery source to enable mobile microsystems such as micro air vehicles and microrobots.

High-inductance-density air core inductors and transformers have been fabricated using a three-dimensional copper electroforming process. These devices have measured inductance densities > 100 nH/mm2  and quality factors > 20. Optimal performance is achieved in the range of 50 MHz - 500 MHz to enable next generation switching converters operating at very high frequencies.

SEM image of three-dimensional, stacked, air-core microinductor.

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

Maximum SPL

130 dB @ Ma = 0.5