A Microresonator Based Laser Velocity Sensor Benjamin J

A Microresonator Based Laser Velocity Sensor Benjamin J. A. Wise, Vahid Eghbalifarkoosh, M. Volkan Otugen, Southern Methodist University, Dallas, TX 75205, and Dominique Fourguette, Michigan Aerospace Corporation, Ann Arbor, MI 48108, AIAA Sci. Tech Forum, 8 -12 January 2018, Kissimmee, Florida *Supported by NASA through SBIR Phase I and II programs with Dr. F. Amzajerdian as

A Microresonator Based Laser Velocity Sensor • Presentation Outline § § § Project Motivation Measurement Principle Proof of Concept Experiment Signal Processing Algorithm Free Space Coupling Conclusion and Questions 11 January 2018 AMT-06, Velocimetry I 2 of 24

A Microresonator Based Laser Velocity Sensor MOTIVATION 11 January 2018 AMT-06, Velocimetry I 3 of 24

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A Microresonator Based Laser Velocity Sensor MEASUREMENT PRINCIPLE 11 January 2018 AMT-06, Velocimetry I 6 of 24

A Microresonator Based Laser Velocity Sensor Photodetector Control Unit Resonator Receiving Optics Probe Volume Laser Transmitting Optics 11 January 2018 AMT-06, Velocimetry I Outgoing Beam 7 of 24

A Microresonator Based Laser Velocity Sensor • 11 January 2018 AMT-06, Velocimetry I 8 of 24

A Microresonator Based Laser Velocity Sensor Microsphere Single mode Optical fiber Tapered fiber photodiode Transmission Tunable laser 11 January 2018 AMT-06, Velocimetry I FSR l 1 l 2 n 9 of 24

A Microresonator Based Laser Velocity Sensor PROOF OF CONCEPT EXPERIMENT 11 January 2018 AMT-06, Velocimetry I 10 of 24

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A Microresonator Based Laser Velocity Sensor Automatic Dip Detection Manual Dip Detection Cross Correlation 11 January 2018 AMT-06, Velocimetry I 14 of 24

A Microresonator Based Laser Velocity Sensor SIGNAL PROCESSING 11 January 2018 AMT-06, Velocimetry I 15 of 24

A Microresonator Based Laser Velocity Sensor Useable Potentially Useable Worst Case 11 January 2018 AMT-06, Velocimetry I 16 of 24

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A Microresonator Based Laser Velocity Sensor FREE SPACE COUPLING 11 January 2018 AMT-06, Velocimetry I 19 of 24

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A Microresonator Based Laser Velocity Sensor • Conclusions § Demonstrated measurement of Doppler-shifts of laser light scattered from a moving target § Due to high resonator Q-factors, very small changes in the velocity can be determined – Current results indicate a 2. 4 m/s velocity resolution § Demonstrated a signal processing approach that may mitigate the effect of signal dropout § Demonstrated a direct (free-space) coupling 11 January 2018 22 of 24 approach to further mitigate effect of signal AMT-06, Velocimetry I

QUESTIONS? 11 January 2018 AMT-06, Velocimetry I 23 of 24

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