Researchers at NIST have developed a new method called SHEEP (Simple, High dynamic range, and Efficient Extraction of Phase map) for measuring the phase map of atoms in atom interferometer gyroscopes. This technique allows direct calculation of the phase gradient pattern from a series of four phase-shifted images, eliminating the need for complex data fitting.
Key advantages of the SHEEP method include:
– Ability to measure smaller rotation rates
– Faster data processing without fitting
– Higher measurement bandwidth
– Reliable measurements with low contrast fringes
– Unambiguous rotation measurements
The technique works by shifting the laser phase through a full 360 degrees while taking images, allowing direct calculation of the phase map from pixel values. This simplifies data acquisition and analysis, making it well-suited for real-time inertial navigation systems.
The phase shifting is achieved using common laboratory equipment, requiring precise control of the laser scan rate to accurately reconstruct the phase map.
Keywords: Phase, Interferometer, Rotation, Atom, Laser
