Robust inertial sensing with point-source atom interferometry for interferograms spanning a partial period
2020
Point source atom interferometry (PSI) uses the velocity distribution in
a cold atom cloud to simultaneously measure one axis of acceleration
and two axes of rotation from the spatial distribution of interferometer
phase in an expanded cloud of atoms. Previously, the interferometer
phase has been found from the phase, orientation, and period of the
resulting spatial atomic interference fringe images. For practical
applications in inertial sensing and precision measurement, it is
important to be able to measure a wide range of system rotation rates,
corresponding to interferograms with far less than one full interference
fringe to very many fringes. Interferogram analysis techniques based on
image processing used previously for PSI are challenging to implement
for low rotation rates that generate less than one full interference
fringe across the cloud. We introduce a new experimental method that is
closely related to optical phase-shifting interferometry that is
effective in extracting rotation values from signals consisting of
fractional fringes as well as many fringes without prior knowledge of
the rotation rate. The method finds the interferometer phase for each
pixel in the image from four interferograms, each with a controlled
Raman laser phase shift, to reconstruct the underlying atomic
interferometer phase map without image processing.
- Correction
- Source
- Cite
- Save
- Machine Reading By IdeaReader
33
References
1
Citations
NaN
KQI