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IR Communication Channel Supplemental SWNT Component

IR Communication Channel Supplemental SWNT Component . SDP team Yngvesson Ioan Tihenea Tomas Broka Dmitriy Stupak Sergey Derivolkov. Design Overview.

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IR Communication Channel Supplemental SWNT Component

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  1. IR Communication ChannelSupplemental SWNT Component SDP team Yngvesson Ioan Tihenea Tomas Broka Dmitriy Stupak Sergey Derivolkov

  2. Design Overview For our Senior Design Project we were working on creating a communication system that has two computer interface terminals and hardware circuitry components on each end and an Infrared communication channel (transceiver) in the center. The key component to our SDP project was a Single Walled Carbon Nanotube (SWNT) thin film detector detecting IR radiation. Due to technical issues, the SWNT thin film detector will be simulated with a photosensitive diode.

  3. System Overview

  4. What happened to the SWNT Thin Film • Idea/Theory • Materials • Budget Constraints • Process • First Attempts • Using Different Carbon Nanotubes • Wider Holes on Devices • Following the Literature • Challenges • Quality of Film • Survival of the Acetone Bath

  5. Circuitry and Program Aspects Program • The Logic of the Program • Transmitter End MCU • Receiver End MCU Circuitry • Transmitter Circuitry • Receiver Circuitry • Multiple Stage Amplifiers • Flexibility of Design

  6. Signal analysis • Using a multimeter we detected a signal in a range of 0.3 mV to 0.6 mV. • When a film that was detecting a signal in the above range was put on our breadboard, we were not able to detect any signal, the oscilloscope would show only noise. • We shielded the board also used a battery to eliminate 60 Hz noise but signal still couldn’t be detected. • The performance of our circuit couldn’t be determined.

  7. Signal analysis cont. • Replaced the film with a photodiode and the signal could be detected easily. • Using an active probe we were able to detect a signal of 2mV (in a distance of 200cm between IR LED and the photodiode at a frequency of 500 Hz).

  8. Signal analysis cont. • Using a passive probe, to measure the signal from our circuit (photodiode connected to amplifier) the lowest signal peak to peak to be detected was 1.6 mV.

  9. Signal to noise ratio (S/N) • S/N is 1.3. • S/N needs to be higher than 3 for the circuit to work properly. • We conclude that our signal need to be higher than 5 mV to be detected by our circuit.

  10. Demo Demo Presentation

  11. Questions ?

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