Air Coupled Ultrasonic Imaging For Non-Destructive Testing

Ongoing Development

• Transducer Characterization

• http://www.ukessays.com/essays/physics/cardiac-ultrasound-machine.php

Ongoing Development

• Noise Reduction
• Antenna
• Logic circuit
• Separation of signals

Antenna

• Design a copper material which will border the transducer
• Antenna shape will be determined by the transducer design
• Electromagnetic energy (noise) is received for removal with a differential amplifier circuit

Logic circuit

• Threshold detection
• comparator circuit to detect presence of electromagnetic noise
• Ensure noise has been removed

Separation of signals

• Instrumentation amplifier that will remove the antenna data from the received signal
• Bandpass filter the signal to reduce remaining noise
• Amplify the remaining signal for processing

• Transducer Signal Processing

• Input Signal

• Antenna Signal

• -

• Amplifier

• Bandpass Filter

• Image Signal Processing
• (Matlab)

Ongoing Development

• Circuitry
• Filter
• Amplifier
• Logic Circuit

Circuitry

• Use high GBW op amps
• Broken into functional components

Differential Amplifier

• Eliminates background noise
• Eliminates electromagnetic noise

Differential Amplifier

Band Pass Filter

• Limits signal to ultrasonic frequencies of interest
• Easily configurable passband

Band Pass Filter

Output Amplifier

• Increase gain of final signal
• Currently set to 40dB gain

Filter Frequency Response

System Performance

• Most electromagnetic noise suppressed
• Signal amplified 40dB above input signal

Projected Schedule

Task	Progress	Start	End
Circuitry Design	In Progress	February 25th	March 13th
Transducer Characterization	In Progress	February 23rd	March 25th
Circuitry Fabrication	Not yet started	March 14th	March 19th
Transducer Housing	Not yet started	March 14th	March 22nd
Signal Analysis	Not yet started	March 26th	April 10th
Final System Integration	Not yet started	April 7th	April 12th

Market Analysis

• Frequently used couplants used for transmission
• Oil, glycerin, and water
• Success with air can open a new market of devices
• Possible Device Users
• Aviation/Aerospace companies; Boeing, Lockheed Martin, NASA
• NASA Space Shuttle
• Currently uses Laser Dynamic Range Imager (LDRI)
• Only provides superficial data
• Air Coupled Ultrasonics (ACU) provides information deeper than the surface

Updated Parts Cost Table

Part Description	Quantity	Unit Price	Price
2'x2' Printed Circuit Board (PCB)	2	$3.45	$6.90
Operational Amplifiers (Op-amp)	10	$1.50	$15.00
Resistor	10	$0.90	$9.00
Capacitor	5	$0.95	$4.75
BNC Connectors	4	$5.00	$20.00
Custom Machined Aluminum	2	$30.00	$60.00
Cellular Polypropylene Foam (1m)	1	$15.00	$15.00
DC Power Supply (400 W)	1	$100.00	$100.00
Cable (10 ft BNC)	1	$20.00	$20.00
Mounting Hardware Kit	1	$20.00	$20.00
Project Total			$270.65

Cost Analysis

• 60 Engineering hour for each group member
• $50/hr give a cost of $9000 in labor
• 22.8% profit at a sales price of 2,500 ($571 per unit sold)

Future Issues

• Developing supporting software
• User interface design

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owen -> English 101-007 Professor Sims

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