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Device to Measure the Force and Frequency of Vibrations From a Mosquito ’ s Proboscis

Device to Measure the Force and Frequency of Vibrations From a Mosquito ’ s Proboscis. Jake Feala and Kevin Brosche BME 400 – Capstone Design Client: Professor Amit Lal Department of Electrical Engineering Advisors: Professors Willis Tompkins and Mitch Tyler

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Device to Measure the Force and Frequency of Vibrations From a Mosquito ’ s Proboscis

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  1. Device to Measure the Force and Frequency of Vibrations From a Mosquito’s Proboscis Jake Feala and Kevin Brosche BME 400 – Capstone Design Client: Professor Amit Lal Department of Electrical Engineering Advisors: Professors Willis Tompkins and Mitch Tyler Department of Biomedical Engineering

  2. To design a device to sense and quantify forces and vibrations present in mosquito bites. To use this device in the lab to examine and record mosquito bite characteristics. Problem Statement

  3. Mosquito biting mechanism Hypothesis: Vibrate their proboscis Virtually undetected by humans Long-term goal: Design a needle that mimics this behavior. Possibility of identifying mosquitoes based on biting characteristics. Control and disease prevention Human Applications [www.therasense.com]

  4. Current Device CO2 Regulator Electronics PVDF Sensor Heat Source

  5. Data • Shows trains of pulses, each ~200 Hz • Impulse response of system ~ 600 Hz • Matlab analysis of frequency response • No differences so far between Anopheles gambaie, stephensi

  6. Signal Regulator “Click” Bites

  7. Signal Close-Up

  8. Frequency Response Mosquito bite frequency Natural response

  9. Current Device Limitations • Signal acquisition • High frequency noise • Have to use scope • Mosquitoes unresponsive to attractants • Possible reasons: • Small, sealed environment • CO2 concentration too high • Too bright • Too dry, too hot

  10. Signal Acquisition Solutions • Fix computers, switch to LabView • Separate power source • 2 9V batteries • Successful elimination of interference

  11. New physical layout provides more room and air exchange Mount sensor vertically Larger, darker environment (red cellophane) Regulate heat CO2 Humidify the environment, bubble through water Establish concentration gradient Other chemicals: bug spray, skin oils Attractant Solutions

  12. New Layout CO2 Humidifier Glass Chamber Fan Sensor

  13. Schedule • Make modifications to existing device • Set up LabView to gather signals, rather than oscilloscope • Testing • Signal • attractants

  14. Questions? Acknowledgements: Dr. John Randall, Senior Entomologist, SCJohnson Dr. Susan Paskewitz, Professor of Entomology, UW

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