Abstract:
An inertial sensing system comprises a first multi-axis atomic inertial sensor, a second multi-axis atomic inertial sensor, and an optical multiplexer optically coupled to the first and second multi-axis atomic inertial sensors. The optical multiplexer is configured to sequentially direct light along different axes of the first and second multi-axis atomic inertial sensors. A plurality of micro-electrical-mechanical systems (MEMS) inertial sensors is in operative communication with the first and second multi-axis atomic inertial sensors. Output signals from the first and second multi-axis atomic inertial sensors aid in correcting errors produced by the MEMS inertial sensors by sequentially updating output signals from the MEMS inertial sensors.
Abstract:
The invention relates to a method for measuring an external parameter (a) by means of atomic interferometry using two sets of atoms (11, 12) that belong to different species. Two measurements are taken simultaneously at the same location, but independently from one another, in order to obtain two measurement results (P 11 , P 12 ). Constant phase shifts that appear in the atomic interferences for the two atom sets are quadrature-adjusted in order to ensure that one of the two measurements provides a value for the external parameter with satisfactory accuracy.
Abstract:
An inertial sensing system comprises a first multi-axis atomic inertial sensor, a second multi-axis atomic inertial sensor, and an optical multiplexer optically coupled to the first and second multi-axis atomic inertial sensors. The optical multiplexer is configured to sequentially direct light along different axes of the first and second multi-axis atomic inertial sensors. A plurality of micro-electrical-mechanical systems (MEMS) inertial sensors is in operative communication with the first and second multi-axis atomic inertial sensors. Output signals from the first and second multi-axis atomic inertial sensors aid in correcting errors produced by the MEMS inertial sensors by sequentially updating output signals from the MEMS inertial sensors.
Abstract:
Embodiments described herein provide for a method of launching atoms in an atom interferometer. The method includes determining a direction of the total effective acceleration force on the atoms, controlling a direction of launch of the atoms for measurement in the atom interferometer based on the direction of the total effective acceleration force, and obtaining measurements from the atoms.
Abstract:
A gyroscope for detecting angular velocity includes a closed housing (14) having a plurality of nested layers (16, 18, 20) of superconducting material with the majority of these nested layers being divided so as to disrupt the path of superelectrons traveling within the superconducting material of these nested layers. These nested layers of superconducting material shield the interior of the closed housing from external magnetic fields and prevent the generation of a London moment field within the closed housing when the housing is rotated. A gyroscope sensor is securely mounted within the closed housing for detecting the rotation of the housing. The gyroscope sensor is comprised of a gyroscope sensor block having a plurality of sensor device faces where a corresponding plurality of gyroscope sensor devices are situated. Each of the plurality of gyroscope sensor devices is comprised of a multilayer superconducting thin film structure.
Abstract:
System and methods for a vacuum cell apparatus for an atomic sensor are provided. In at least one embodiment, the apparatus comprises a cell wall encircling an enclosed volume, the cell wall having a first open end and a second open end opposite from the first open end and a first panel over the first open end of the cell wall and having a first surface, the first surface facing the enclosed volume and having a first set of diffractive optics therein. Further, the apparatus comprises a second panel over the second open end of the cell wall and having a second surface, the second surface facing the enclosed volume and having a second set of diffractive optics therein; wherein the first set of diffractive optics and the second of diffractive optics are configured to reflect at least one optical beam within the enclosed volume along a predetermined optical path.
Abstract:
Systems and methods for an optically dithered atomic gyro-compass are provided. In one embodiment, an inertial sensor comprises: a vacuum chamber containing a cloud of laser cooled alkali atoms, wherein the atoms are free to fall under the influence of gravity;a first set of laser sources applying a first set of laser beams into the cloud along a first axis;a second set of laser sources applying a second set of laser beams into the cloud along a second axis;wherein the first set and second sets of laser beams apply coherent laser pulses that separate a wave function of the atoms along trajectories defining a plane sensitive to rotation about an axis orthogonal to the plane; and wherein the first and second set of laser sources apply dithering to the axis by modulating a relative magnitude of the first laser beams with respect to the second laser beams.
Abstract:
The invention relates to a measurement by means of atom interferometry, using a Raman source that is created by modulating a monochromatic laser source. By conveniently selecting positions (P 0 , P 1 , P 2 ) in which interactions between atoms and a laser radiation, produced by the Raman source, are caused, it is possible to eliminate or at least reduce a measurement bias caused by supplementary components of the laser radiation. Such a measurement having eliminated or reduced bias can be used in an inertia sensor.