SELF-CALIBRATING NUCLEAR MAGNETIC RESONANCE (NMR) GYROSCOPE SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a self-calibrating nuclear magnetic resonance (NMR) gyroscope system that substantially mitigates bias errors.SOLUTION: The system includes: a vapor cell 12 comprising an alkali metal and a plurality of gyromagnetic isotopes, a pump laser 20 that spin-polarizes the alkali metal; a probe laser 22 that generates an optical probe beam; and a detection system 24 that monitors the optical probe beam and calculates a rotation of the NMR gyroscope system about a sensitive axis on the basis of a modulation of the optical probe beam in response to precession of the plurality of gyromagnetic isotopes resulting from the spin-polarization of the alkali metal. The system further includes a calibration controller 26 that modulates a characteristic of the optical pump beam to substantially mitigate bias errors associated with the gyromagnetic isotopes in the calculation of the rotation.SELECTED DRAWING: Figure 1