Nuclear magnetic resonance gyro scope

Claim 1

In a nuclear magnetic resonance detection device including a nuclear magnetic resonance cell, a gas vapor of a first optically pumpable substance that possesses a magnetic moment and is capable of being optically pumped, said pumpable substance being contained in said cell, at least one nuclear moment gas each having a nuclear magnetic moment also contained in said cell, the nuclear magnetic moments of each said nuclear moment gas being at least partly aligned, means for applying a steady magnetic field to said cell, first means for illuminating said cell with pumping light capable of partly aligning the magnetic moments of said optically pumpable substance in one direction by absorption of said light, means for precessing said aligned nuclear magnetic moments of each said nuclear moment gas about the direction of the steady magnetic field at the respective Larmor precession frequencies of each said nuclear moment gas, means for applying an AC carrier magnetic field to said cell, the improvement comprising: a gas vapor of a second optically pumpable substance that possess a magnetic moment and is capable of being optically pumped, said second optically pumpable substance being contained in said cell; second means for illuminating said cell with detection light of a wavelength approximately equal to a wavelength which can be absorbed by said second optically pumpable substance; means for applying said detection light with a component orthogonal to the direction of said AC carrier magnetic field to produce modulations in the intensity of the transmitted part of said detection light substantially at the frequency of at least one harmonic, including the fundamental of said AC carrier magnetic field; and means for detecting at least one of said modulations in the intensity of the transmitted part of said detection light.