We demonstrate a 87Rb–129Xe/131Xe atom spin gyroscope, where two stage lock-in-amplifiers are applied to measure the shift of the NMR frequency. The NMR frequency shifts and their Allan deviation are analyzed during on- and off-resonance operation. The filter effects of the lock-in-amplifiers are investigated in terms of the Allan deviation. Based on the dual species operation, we achieve an angular random walk of 1.11 deg h–1/2 for the rotation rate. The slightly off-resonance operation reveals that the NMR insensitive white noise of the 131Xe signal limits the angular random walk of our system.
Sagnac interferometer gyroscopes can be divided into three large generations using starting points of time or highlights of their research. As the first generational Sagnac interferometer, the ring laser gyroscopes have been studied since the 1960s by laser invention, and as the second generational Sagnac interferometer, the fiber optic gyroscopes have been studied since the 1970s by invention of optical fiber for communication. In the latter half of the 1990s, after having confirmed the wave theory of the atom, studies of atomic interferometers were started for a next generation gyroscope application. This paper discusses the operation principles, application, and future prospects of these three generations of Sagnac gyroscopes.
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