Optical tactile topographic sensor for infrastructure or
biophysical structure
Hotwire directional sensitive acoustic sensor
Virtual instrumentation for viscosity sensor
(see Research Animation )
2-D display image from the polymer based micro cantilever
scanner
2-D image taken by the polymer based micro cantilever
scanner
Self-configurable block simulation
Recent Research Development
Novel polymer based sensor use for pressure
and shear sensing, Currently funded by VA Health
Care System in
Integrated
optical scanning image acquisition and sensing device
Optical
scanning endoscope using Microfabricated composite
slab waveguide. Research ongoing with Human Interface laboratory at Washington
Technology Center
Ultra high speed polymer based optical
scanning endoscope
Utilize novel polymer structure for
high speed scanning image display and image acquisition, patent pending
Directional microphone using micro
fabricated hot wire sensor
Measure sound wave via monitoring its
particle velocity. Aspect ratio of the
probe governs the directional sensitivity of the sound wave.
Fiberoptic based fluid viscosity and flow sensor
The method make use of the effect of a fluid
on the oscillations of a fiber-optic probe immersed in the fluid for viscosity
and flow rate measurement, patent pending.
Polymer based multi-parameter sensor
system (smart skin)
Embedded optical and electronic sensors in
composite polymer thick film- using screen printing process, patent pending.
Plasma etching process on low k
dielectric materials
Study of directional control of plasma for 3-D Anisotropic etching.
3-D microfabrication technique
Novel technique involves simple grayscale photolithography developed by Prof. Afromowitz and combination of wet and dry etching process developed by myself
Fiber optic based distributive fault
line detection system
An early warning system that monitors local
magnetic field disturbance due to fault line activity
Fiber optic based IR spectrometer for
health monitoring
A new non-invasive health monitoring system using all fiber-optic sensor
Micro actuator for steering scanning endoscope
Self propel actuator made of thermally
activated alloy is used to steer and increase the field of view of the Microfabricated endoscope.
Antonymous
robotic mapping unit
Mini robot unit uses array of ultrasonic
transducers and electronic compass to steer and survey the terrain. All Data being collected by the robot
is intern fed to a computer via a wireless RS-232 transceiver. This data is interpreted by the computer,
which then prints the data on the screen in a form readable by humans.
Self-configuring building blocks made of modular robot
with latches, actuators and a control system are used to explore the potential
uses of dynamic structures.
An acoustic wave liquid ejector
(AWLE) array uses focused acoustic waves for ink jet printing and micro fluidic
mixer. The focusing acoustic waves are generated by half-wave-band sources
(made of successive annular rings on the transducer similar to Fresnel lens). When acoustic waves impinges on the
liquid-air interface from the liquid side, there is a static radiation pressure
associated with waves, and this radiation pressure acts to overcome the
restraining force of the surface tension to expel a droplet from the liquid
surface. Mixing occurs when particles are flowing the flow pattern produced by
focused acoustic waves.
Directional sensitive acoustic transducer
built on a 1.5um thick dome shaped silicon-nitride diaphragm with ZnO piezoelectric film. Novelty is on fabrication process
where simple 3-D structure can be constructed using either wet-etching process
or micro-melding process.
FEM modeling of
composite structure for ZnO based flat diaphragm
transducer
To resolve
problem with tensile stress on the diaphragm due to the residual stress stem
from
Probe is made
of optical fiber with two mirrors deposited to the ends that forms an optical
The principle of using differential phase modulation between the LP01
and Lp11even modes in two
mode elliptical-core fiber for strain measurement of the embedded
structure and fluid viscosity
measurement.
Other small projects:
Designed a mechanical impedance and micro-force
sensor using forward scattering from a micro-pipette for a viscous fluid and microscopic
structure.
Measured the profile of a taper
pipette using forward light scattering.
Measured micro-displacement using
fiber-optic interferometer
Developing a viscosity sensor
using forward light scattering from a optical fiber.
Optical switch using rapid
prototyping technique
Accelerometer using optical
waveguide structure.
