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Sean’s Research and Stuff

Explore innovative research in Radio Frequency Identification (RFID) and Portable Chemical Sensor technology at DMS Laboratory. Learn about optimization strategies, extending RFID capabilities, and combining art with technology for enhanced chemical direction.

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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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