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Compact High-Resolution Absolute-Gravity Gradiometer Based on Atom Interferometers
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DOI：10.1103/PhysRevApplied.18.054091.png)
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Abstract
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We present a compact high-resolution absolute-gravity gradiometer based on dual Rb-85 atom interferometers using stimulated Raman transitions. A baseline of L = 44.5 cm and an interrogation time of T = 130 ms are realized in a sensor head with a volume of only 95 l. Many experimental parameters are optimized to improve the short-term sensitivity, whereas interleaving measurements by reversing the direction of the Raman wave vector are implemented to improve the long-term stability. After an averaging time of 17 000 s, a phase resolution of 104 mu rad is achieved, which corresponds to a gravity-gradient resolution of 0.86 E (1 E = 1 x 10(-9)/s(2)). After the evaluation and correction of systematic errors induced by light shift, the residual Zeeman shift, the Coriolis effect, the self-attraction effect, etc., the instrument serves as an absolute-gravity gradiometer and with it the local gravity gradient is measured to be 3114 (53) E. This instrument combines the merits of high-resolution, high-compactness and high-accuracy, and has good application prospects in many fields.
Keywords:
LASER SYSTEM
CONSTANT
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