1. MSD1 Senior Design Project- Oxygen Gas Sensor P09051 Samuel Shin Jeremy Goodman Sponsor: RIT uE & EE department Project Guide: Professor Slack

2. Agenda Project description High Level Customer Needs/ Eng Specs Concept Description & Rationale System Architecture High Risk Assessment Current State of Design Milestone Schedule for Next Quarter

3. Project Description Oxygen gas detection via fluorescence quenching. Based on Tris-Ruthenium[II](dichloride) material incorporated in an oxygen-permeable polymer ◦ Responds to gaseous %Oxygen which changes fluorescent intensity and lifetime ◦ Higher O2 conc = decreased intensity and lifetime Method has been researched and is widely used ◦ Expensive ◦ Equipment not readily available to everyday user Plan is to design a complete cost & size- efficient sensor system for the measurement of % Oxygen

4. High Level Customer Needs / Eng Specs Provide consistent measurement results ◦ LED pulse width at 100ms ◦ Entering wavelength at 455nm Cost and size-effective ◦ Commercially available LED source ◦ Standard electronic components for signal conditioning ◦ Low-cost, high performance optical filters ◦ RIT SMFL designed/built photodetector ◦ Ru(dpp) polymer created in RIT Chem dept.

5. Concept Description/ Rationale Incorporate the entire system inside a light-tight box Inject fixed amounts of nitrogen and oxygen to exhibit an environment with fixed %Oxygen

6. System Architecture Input Signal (100ms pulse width from function generator) LED Pulsing Circuit (455nm) Ru(dpp) Thin Film (fluorescent material) – emitting wavelength of 613nm Signal Conditioning Amplified Signal in Oscilloscope (I or V vs. Time)

7. High Risk Assessment Still a proof of concept ◦ Design will have to be modified to match needs  Unclear Parameters will exist  Where noise is coming from, etc Materials ◦ Creating Ru(dpp) polymer has to be done with help from a faculty member

8. Current State of Design Preliminary Circuit Simulations complete Ru(dpp) Polymer ◦ Acquired dry chemical ◦ Need polymer component (still being researched) Budget  Major sources that need funding  Gas Flow Chamber  Optical Glass Filter  Protoboards  Electronics (various components)  Projected amount at ~$600 dollars

9. Milestone Schedule For Next Quarter Wk1-2 (March 9 th – March 20 th ) ◦ Mix polymer/ start on photodiode design ◦ Obtain all electronics and test chamber materials Wk3-6 (March 23 rd -April 3 rd ) ◦ Characterize output behavior of photodiode  Noise Analysis ◦ Start on fabrication of photodiode  Target completed at Wk 6 ◦ Assembly of Chamber Wk 6-8 (April 13 th – May 1 st ) ◦ Complete Testing of Prototype Oxygen Sensor Wk 8-9 (May 4 th – May 15 th ) ◦ Documentation / Preparation for Presentation, etc