Thermal imaging based on mechanical vibrations

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2022-8-19

Author

Yılmaz, Şener

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The thesis proposes a digital, resonance readout method based on a lock-in based digital phase locked loop (DPLL) mechanism, which is designed, simulated, implemented and tested using a Xilinx made Field Programmable Gate Array (FPGA). Implementation is performed using a hardware descriptive language (VHDL) on low level. Certain digital signal processing algorithms such as lock-in detection, DPLL, DDS and CORDIC are implemented, simulated and tested. Moreover, the design is shown to be capable of resonating both single and multiple resonators simultaneously in real time. As a proof of concept, a low-cost RLC based, low quality factor resonant position sensor with sub micron resolution is tested along with high quality factor quartz crystals for demonstration of simultaneous multi device operation capability. Finally, it is shown that the proposed method can be used for detection of temperature using capacitive MEMS resonant microbolometer arrays, as well as any kind of resonance based sensor.

Subject Keywords

CORDIC, Resonant MEMS temperature sensing, Lock-in amplifier, Direct digital synthesis, Digital signal processing

URI

https://hdl.handle.net/11511/99434

Collections

Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

Ş. Yılmaz, “Thermal imaging based on mechanical vibrations,” M.S. - Master of Science, Middle East Technical University, 2022.