15 October 2012 Dither-frequency-track method based on phase sensitive detector technology in mechanically dithered ring laser gyros
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To avoid lock-in phenomenon, a rotational oscillation is implemented in mechanically dithered ring laser gyros. This oscillation or dither is typically provided by a dither motor. The dither motor needs to be driven at the resonant frequency, so dither controlling systems must track the resonant frequency of dither motors. In this paper, a frequency track method based on phase sensitive detector technology is put forward and compared with the traditional selfoscillation method in details. In high-low temperature experiments (-40℃ to 60℃), this method and the traditional one are compared. The results show that the new method has the equivalent accuracy as the traditional one. But this method has more compact dimension, and the amplitude evaluation and noise injection are easier.
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Guangfeng Lu, Guangfeng Lu, Hui Luo, Hui Luo, Zhenfang Fan, Zhenfang Fan, } "Dither-frequency-track method based on phase sensitive detector technology in mechanically dithered ring laser gyros", Proc. SPIE 8418, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Design, Manufacturing, and Testing of Smart Structures, Micro- and Nano-Optical Devices, and Systems, 84181K (15 October 2012); doi: 10.1117/12.975771; https://doi.org/10.1117/12.975771


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