Non-uniform sampling to extend dynamic range of...

Details Non-uniform sampling to extend dynamic range of... Non-uniform sampling to extend dynamic range of...

2011-03-29

2011-03-29

Chowdhury, Tarifur (Department: 2886)

Optics: measuring and testing

By light interference

Using fiber or waveguide interferometer

Reexamination Certificate

active

07916303

ABSTRACT:
Methods and apparatus for interrogating optical sensors with high slew rates using non-uniform sampling are provided. The transmission of optical signals in a non-uniform pattern is employed to allow for demodulation of fringe rates exceeding the commonly understood Nyquist frequency limit given as one half of the mean sampling frequency. By monitoring the time dependent fringe frequency and assuming that the fringe frequency has a limited bandwidth, only a limited bandwidth smaller than the Nyquist bandwidth around the instantaneous fringe frequency needs to be reconstructed at any time.

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