Document Outline - Optical diffraction phenomena around the edges of photodetectors: A simplified method for metrological applications
- Methods
- Concept of edge diffraction.
- Concept of diffraction around a photodetector edge: Simultaneous generation and detection.
- Results and Discussion
- Laboratory characterization for vibration sensing.
- Validation of vibration sensing with multiple frequencies.
- Validation as an optical microphone.
- Conclusions
- Acknowledgements
- Figure 1 Schematic diagram illustrating the diffraction phenomenon by a straight edge.
- Figure 2 Diffraction around the edge of a photodetector: (a) Experimental scheme for simultaneous generation and detection (b) Edge illumination (c) Obtained diffraction pattern and (d) Obtained intensity distribution.
- Figure 3 Experimental setup for vibration sensing.
- Figure 4 Experimental results validating the capability of the proposed method for vibration sensing and comparison between the reference and observation signals.
- Figure 5 Experimental validation of the proposed method as a vibration sensor for a band of frequencies with an audio wave file input.
- Figure 6 Conceptual design sketch of an optical microphone that uses photodetector edge diffraction.
- Figure 7 Temporal, spectral and coherence responses of the optical microphone.
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