Transcript Acoustic Fossil Imaging

Acoustic Fossil Imaging
by
Matt Kaiser & John Lewis
Advised by: Dr. James H. Irwin & Mr. José Sánchez
Outline
Matt Kaiser
-Project Summary
-Functional Description
-References
-Parts List
-Schedule
John Lewis
-System Level Block
Diagram
-Sub-System Level
Block Diagrams
-Specification Sheet
-User Interface
Project Summary
Goal: Image Fossils Buried in Rock
Major Components: Ultrasonic Sensor, Data
Acquisition, and PC
Signal Processing in MATLAB
Data Acquisition with Tektronix TDS3012B
e*scope
System Block Diagram
Data Acquisition
Overall Block Diagram
Sensor Block Diagram
Acoustic Sensor
Description: A device that sends a burst of 16
50[kHz] acoustical pulses
Acoustic Foam
Description: The acoustical foam narrows the
dispersion angle of the sensor to provide more
accurate results
Oscilloscope Block
Diagram
Oscilloscope
Description: The oscilloscope provides a means to
view the data graphically
Format Output
Description: This allows the graphical data to be
put into a form that can be imported to a PC with
MATLAB
Signal Processing
PC with MATLAB
Description: The signal processing will allow the
user to see the object in three dimensions, and will
give other useful data about the object (e.g. length,
width, and height)
Software Flow Chart
Import Data
This converts the data into a useable form for MATLAB
manipulation
Correlate Data
This allows multiple echoes contained in each other to be
determined
Dimension Determination
Using time delays the dimensions of an object can be determined
3-D Plot
This allows the user to view a specific object in 3-D
User Interface
Move Sensor by Hand
Acquire Data with Oscilloscope
Run MATLAB M-File
Specifications
Parameter
Min
Typ
Max
Units
Power Supply Voltage
4.5
5
6.8
V
Input Frequency
-
10
-
Hz
Input Voltage
0
-
4
V
Transmit Frequency
-
49.4
-
kHz
Transmit Pulses
-
16
-
-
Transmit Sensitivity
110
-
-
dB
Receive Frequency
-42
-
-
dB
Operating Temperature
0
-
40
°C
Operating Distances
6
-
35
ft
Vertical Directivity Pattern
0
-
60
°
Parts List
Ultrasonic Transducer
Tektronix Oscilloscope
HP Single Power Supply
Krohn-Hite Function Generator
PC
“Chips”
References
Acoustic imaging: The reconstruction of
underwater objects, IEEE Visualization, 1991,
p. 94-101, ISBN: 0-8186-2245-8
Brunner, Eberhard, Ultrasound System
Considerations and Their Impact on Front-End
Components, Analog Devices, 2002
Case study: Visualization of 3-D ultrasonic
data, IEEE Visualization, 1994, p. 369-373,
ISBN: 1070-2385
Schedule
Date
January 27
Planned Work
Implement New Sensor
February 3
February 10
February 17
February 24
Work on Better Test Platform and Sensor Hardware
Acquire Data and Process
Work on More Complex Calculation Routines
Attempt to Image Objects Buried with Other Objects
March 2
March 9
March 16
March 23
Continue Complex Imaging
Implement More Sensors if Necessary
Spring Break
Testing
March 30
April 6
Testing
Final Software and Hardware Implementation & Testing
April 13
April 20
Make Adjustments to Improve System
Prepare for Expo
April 27
Prepare Final Presentation
Questions?
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