acoustic fossil imaging by matt kaiser & john lewis advised by: dr. james h. irwin & mr....
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Acoustic Fossil Imaging
byMatt Kaiser & John Lewis
Advised by: Dr. James H. Irwin & Mr. José Sánchez
Outline
Matt Kaiser John Lewis
-Project Summary-Functional Description-References-Parts List-Schedule
-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 ChartImport 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”
ReferencesAcoustic 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 Planned Work
January 27 Implement New Sensor
February 3 Work on Better Test Platform and Sensor Hardware
February 10 Acquire Data and Process
February 17 Work on More Complex Calculation Routines
February 24 Attempt to Image Objects Buried with Other Objects
March 2 Continue Complex Imaging
March 9 Implement More Sensors if Necessary
March 16 Spring Break
March 23 Testing
March 30 Testing
April 6 Final Software and Hardware Implementation & Testing
April 13 Make Adjustments to Improve System
April 20 Prepare for Expo
April 27 Prepare Final Presentation
May 4 Finishing Touches on Documentation
Questions?
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