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arXiv · 0808.1563

Beyond the frame rate: Measuring high-frequency fluctuations with light intensity modulation

Wesley Philip Wong·Ken Halvorsen
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Abstract

Power spectral density measurements of any sampled signal are typically restricted by both acquisition rate and frequency response limitations of instruments, which can be particularly prohibitive for video-based measurements. We have developed a new method called Intensity Modulation Spectral Analysis (IMSA) that circumvents these limitations, dramatically extending the effective detection bandwidth. We demonstrate this by video-tracking an optically-trapped microsphere while oscillating an LED illumination source. This approach allows us to quantify fluctuations of the microsphere at frequencies over 10 times higher than the Nyquist frequency, mimicking a significantly higher frame rate.

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Wesley Philip Wong, Ken Halvorsen. 2009-01-27. Beyond the frame rate: Measuring high-frequency fluctuations with light intensity modulation. https://doi.org/10.1364/ol.34.000277

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