Acoustic Fossil Imaging - Bradley University

Acoustic Fossil Imaging - Bradley University

Acoustic Fossil Imaging by Matt Kaiser & John Lewis Advised by: Dr. James H. Irwin & Mr. Jos Snchez 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 FrontEnd Components, Analog Devices, 2002 Case study: Visualization of 3-D ultrasonic data, IEEE Visualization, 1994, p. 369373, ISBN: 1070-2385 Schedule Date January 27 February 3 February 10 February 17 February 24 March 2 March 9 March 16

March 23 March 30 April 6 April 13 Planned Work Implement New Sensor 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 Continue Complex Imaging Implement More Sensors if Necessary Spring Break

Testing Testing Final Software and Hardware Implementation & Testing Make Adjustments to Improve System Questions? QuickTime and a Photo - JPEG decompressor are needed to see this picture.

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