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Electronic Design of an Acousto Optic Tunable All Fiber Spectrometer

Electronic Design of an Acousto Optic Tunable All Fiber Spectrometer. Tanuja A. Mouli Faculty Mentor: Professor Henry P. Lee Graduate Student: Fares Alhassen. The Project: Big Picture. Unknown Wavelength. Acousto Optic Tunable Filter (AOTF). Metal Frame. Optical Fiber. PZT.

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Electronic Design of an Acousto Optic Tunable All Fiber Spectrometer

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  1. Electronic Design of an Acousto Optic Tunable All Fiber Spectrometer Tanuja A. Mouli Faculty Mentor: Professor Henry P. Lee Graduate Student: Fares Alhassen

  2. The Project: Big Picture Unknown Wavelength

  3. Acousto Optic Tunable Filter (AOTF) Metal Frame Optical Fiber PZT

  4. AOTF: The PZT (Piezo Electric Tansducer) • Aluminum cone is attached to PZT disk • When AC voltage is applied, the cone vibrates up and down CONE AC PZT

  5. The AOTF Acoustic wave RF PZT and horn (Piezo Electric Transducer) • When PZT vibrates, it creates a micro acoustic wave • Tunable filter is created by changing the frequency of PZT

  6. AOTF: Notch Filter • Acts to pass wide range of frequencies • While attenuating narrow band of frequencies

  7. AOTF PZT Aluminum Cone

  8. Why use AOTF? • AOTF is easily tuned and can be controlled electronically • Optic fibers have low insertion power loss • Original spectrometer used costs 30K • Spectrometer built with AOTF will be low cost ($100), compact and portable

  9. Common Applications • detect chemical compounds • particle sizes • Vibration • acoustic waves • electric field • fluid flow and temperature

  10. Spectrometric Applications • Broadband Infrared (BBIR) • Tunable Camera Filter (TCF) • Portable Optical Spectra Analyzer (POSA)

  11. The Design of the Spectrometer Light Source AOTF Photodetector (PD) RF Amplifier Current –to- Voltage Conversion VCO Microcontroller Output Data

  12. Schematic: Microcontroller Connection with VCO 1. Press button once 2. Press button again 1V 2V 3V 4V

  13. Schematic: Current to Voltage Converter

  14. Schematic: Overall Circuit

  15. Final Circuit VCO C-V converter MCU

  16. Problems and Solutions • VCO purchased (part #SN54LS624) did not output a clean sinusoidal. • A different VCO was used (MAX038) • When MAX038 was connected to microcontroller, the VCO gets hot

  17. Results/Conclusion • Successfully controlled VCO • Need to work on why VCO gets hot. • Controlled C-V converter • Could not view output data

  18. Said M. Shokair Dr. Henry P. Lee Fares Alhassen Patrick Chan Kevin Edmonds UROP UCI IM-SURE Acknowledgements

  19. ANY QUESIONS?

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