Electronic Feedback Loop Sustaining Magnetic Resonance

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Live Poster Session: Zoom Link
Thursday, July 30th 1:15-2:30pm EDT

Ekram Towsif
Ekram Towsif

Ekram is a senior at Wesleyan triple majoring in Physics, Molecular Biology and Biochemistry, and the College of Integrative Sciences. He lived the majority of his life in Bridgeport, CT but was originally born in Bangladesh. Ekram went to the Fairchild Wheeler Inter-district Magnet Campus where he studied Aerospace/Hydrospace and Physical Engineering. After graduating and matriculating at Wesleyan he has been conducting research in the Physics department since freshman year. He was aiming to pursue a career in Engineering, however his time at Wesleyan has redirected his future aspirations. On campus, Ekram is apart of the McNair Scholars Program which has guided him to pursue a graduate education. After graduating next year he hopes to go on to graduate school to study Biophysics.

Abstract: Resonance is a phenomenon where amplitude increases when the frequency of a periodic external applied force is close to the natural frequency of a system. The driving force adds energy into the system increasing the amplitude indefinitely unless there is damming, like friction, removing energy faster than the amplitude increases. Experimentally, there are multiple ways of balancing externally applied gain to a system with loss from all the system damping, which in turn produces a sustained oscillatory state of the system. We have proven that the same can be done with an oscillating magnet, two coils making a feedback loop, and a Raspberry Pi/HiFi Berry DAC sound card module. In the module, Python was implemented for real-time processing of the system oscillations. One coil measures the oscillations from the magnet and sends it into the Pi/HiFi berry module. The information gets sent into the python code where it’s passed through a bandpass filter and phase shifter, which process the information based on the parameters defined such as the resonant frequency. The filter produces an internal processing delay of 92.156 milliseconds that causes a phase delay of 3-4 cycles. The phase shifter adds additional discrete delays giving us control of the phase difference between the output and input waves. After processing the information its outputted via another coil, driving the magnet at its resonant frequency. The system has been tested and showed sustained self-oscillatory behavior for 24+ hours and correct phases allow oscillatory behavior at resonance to start from thermal fluctuations.

Summer2020_Presentation

Live Poster Session: Zoom Link
Thursday, July 30th 1:15-2:30pm EDT

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