Mr. Peng Jiang Profile

Peng Jiang

at National Univ of Defense Technology

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Proceedings Article | 4 November 2016 Paper

Measuring the relaxation time of the xenon atoms and the rubidium atoms

Peng Jiang, Zhi-Guo Wang, Ying-Ying Li, Qi-Yuan Jiang, Hui Luo

Proceedings Volume 10026, 1002618 (2016) https://doi.org/10.1117/12.2246362

KEYWORDS: Magnetism, Chemical species, Gyroscopes, Polarization, Time metrology, Xenon, Rubidium, Signal to noise ratio, Signal detection, Signal processing

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In a nuclear-magnetic-resonance gyroscope (NMRG), the polarization of nuclear spins and the detection of motional information are usually achieved by utilizing the atomic spins of alkali atoms. The parameters of the atomic spins are mainly evaluated by the relaxation time. Relaxation time is very important and can influence signal-to-noise ratio, dynamic range, start time, and other gyroscope parameters. Therefore, its accurate measurement is critical in the study of NMRG performance. In this study, we evaluate a variety of methods to measure the transverse and longitudinal relaxation times. First we examine the free-induction-decay method, which is the industry standard for measuring spin relaxation time. Second we investigate the improved free-induction-decay, fitting-ratio, and magnetic-resonance-broadening- fitting methods for measuring the transverse relaxation time, and the flipped polarization method for measuring the longitudinal relaxation time. By changing the experimental conditions, we obtain the longitudinal relaxation time using the flipped polarization method under a variety of conditions. Finally, by comparing these measurement methods, we propose the best measurement methods under different conditions.

Proceedings Article | 25 October 2016 Paper

Distributed vibration fiber sensing system based on Polarization Diversity Receiver

Junan Zhang, Peng Jiang, Zhengliang Hu, Yongming Hu

Proceedings Volume 10158, 101580Z (2016) https://doi.org/10.1117/12.2247038

KEYWORDS: Polarization, Receivers, Sensing systems

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In this paper, we propose a distributed vibration fiber sensing system based on Polarization Diversity Receiver(PDR). We use Acoustic Optical Modulator(AOM) to generate pulse light and an unbalanced M-Z interferometer to generate two pulse light with a certain time delay in the same period. As the pulse lights propagating in fibers, the Backward Rayleigh scattering lights will interfere with each other. The vibration on the fiber will change the length and refractive index of fiber which results in the change of the phase of the interference signal. Hence, one arm of the M-Z interferometer is modulated by a sinusoidal phase-generated carrier(PGC) signal, and PGC demodulation algorithm has been used to acquire phase information from the Backward Rayleigh scattering lights. In order to overcome the influence of polarization-induced fading and enhance Signal Noise Ratio(SNR), we set a PDR before the photo detector. The Polarization Diversity Receiver segregates the interfere light into two lights with orthogonal states of polarization. Hence, there is always one channel has a better interfere light signal. The experiments are presented to verify the effectiveness of the distributed vibration fiber sensing system proposed.

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