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Sean’s Research and Stuff

Sean’s Research and Stuff. By Sean Hoyt – October 10, 2001 DMS Laboratory EE1-159. Main Areas of Research. Radio Frequency Identification (RFID) Understanding Optimization – Cypris’ PSoC Extending into other sensing areas Portable Chemical Sensor “Electronic Nose”

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Sean’s Research and Stuff

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  1. Sean’s Research and Stuff By Sean Hoyt – October 10, 2001 DMS Laboratory EE1-159

  2. Main Areas of Research • Radio Frequency Identification (RFID) • Understanding • Optimization – Cypris’ PSoC • Extending into other sensing areas • Portable Chemical Sensor “Electronic Nose” • controller and LCD interface • PCA display for chemical discrimination • Art/Tech Beginnings DMS Laboratory

  3. RFID – Understanding the Basics • System is comprised of a reader, antenna, and tag. • Antenna and tag act as a loosely-coupled transformer DMS Laboratory

  4. Current Amplifier PIC16f84 - R 4MHz clock, + + 125 KHz Sine 20mA at 125 KHz Square Wave 5VDC. L AC Level Booster (5V-18V) V Tag out C Crystal RS-232 Microcontroller Antenna Circuit Drive Circuit 5V V - - - out + + + Digitize Filter Clamp Ripple Detect Peak Detect V analog Decoding Circuit Quick Run-through • RFID fun-damentals DMS Laboratory

  5. RFID Optimization • Match antenna to the reader’s current amplifier • Improve decoding of AM signal from tag • PSoC • Move external components such as the crystal, decoding section, RS232 section onto one chip • Save power, real-estate, costs and time DMS Laboratory

  6. Extending RFID • Use decoding voltages to correlate the distance from antenna to tag • Distance measurement resolution of 7.8mm. • Future work may involve extracting moisture content, density and other properties of an object a tag is embedded into. DMS Laboratory

  7. Portable Chemical Sensor System • Using Sam’s array of sensors, a chemical can be characterized • Each sensor will react differently to the analyte • The combination of reactions forms a pattern • Principal components analysis is used to display the combination in 2D for a person to make the distinction • controller and LCD interface • Do an AD conversion on each sensor to find its voltage • Make matrix internally and apply the PCA values • Use LCD to plot the real-time 2D point • Compare location of 2D point to known 2D points of other chemicals on the screen DMS Laboratory

  8. Combining Art with Technology • Create a visualization of vapor propagation • Use Light Emitting Polymers (LEPs) and polymer chemical sensors together in an array Chemical Direction DMS Laboratory

  9. Conclusion • I have a lot of work to do: DMS Laboratory

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