Physics – Biological Physics
Scientific paper
2008-08-11
Opt.Lett.34:277-279,2009
Physics
Biological Physics
4 pages, 2 figures
Scientific paper
10.1364/OL.34.000277
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.
Halvorsen Ken
Wong Wesley Philip
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