Category: Open for Student Enrollment

Project supervisor: Yoav Hazan

yoav.hazan@campus.technion.ac.il

Optical detection of ultrasound is mostly done with high-Q factor optical resonators. These optical resonators can be manufactured in Silicon wafers, where a common design is of π-phase shift Bragg grating producing a single resonator. Complex grating designs with multiple resonators could enable simultaneous measurement in several positions, accelerating acquisition time.

Coherence-restored pulse interferometry (CRPI) is a recently developed method for optical detection of ultrasound that achieves shot-noise-limited sensitivity and high dynamic range. Today, the CRPI, implemented in free space Fabry-Perot, required a manual calibration process of the feedback circuit to lock the CRPI in operating state. This project core is the automation of the calibration procedure using Arduino microcontroller platform.

Project Status: Available

Project requirements:

1. Design and simulation of complex grating designs to produce a multiple resonance transmission function.
2. Optimization of grating dimensions for narrow resonance and high transmission efficiency.

Recommended readings:

1. Painchaud, Y., Poulin, M., Latrasse, C., Ayotte, N., Picard, M.J. and Morin, M., 2012, June. “Bragg grating notch filters in silicon-on-insulator waveguides”. In Bragg Gratings, Photosensitivity, and Poling in Glass Waveguides (pp. BW2E-3). Optical Society of America.
2. Rosenthal, A., Razansky, D., & Ntziachristos, V. (2011). “High-sensitivity compact ultrasonic detector based on a pi-phase-shifted fiber Bragg grating”. Optics letters, 36(10), 1833-1835.

Project supervisor: Yoav Hazan

yoav.hazan@campus.technion.ac.il

This project is an Arduino based project that combines both simple circuit design and fabrication along with algorithm implementation on the Arduino. This project will integrate into a real research system, in the laboratory for biomedical imaging and sensing, that develop for optical detection of ultrasound.

Coherence-restored pulse interferometry (CRPI) is a recently developed method for optical detection of ultrasound that achieves shot-noise-limited sensitivity and high dynamic range. Today, the CRPI, implemented in free space Fabry-Perot, required a manual calibration process of the feedback circuit to lock the CRPI in operating state. This project core is the automation of the calibration procedure using Arduino microcontroller platform.

Project Status: Available

Project requirements:

1. Design and manufacture amplifier and potentiometer PCB for the Arduino-Feedback circuit interface.
2. Automation of the startup calibration of the CRPI feedback circuit using an Arduino Due microcontroller.
3. Monitoring the CRPI locking state and stability during operation and modifying the calibration parameters if necessary.

Recommended readings:

1. O. Volodarsky, Y. Hazan, and A. Rosenthal. “Ultrasound detection via low-noise pulse interferometry using a free-space Fabry-Pérot.” Optics Express 26, no. 17 (2018): 22405-22418.