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Jiang, Xingfen,Xiu, Qinglei,Zhou, Jianrong,Yang, Jianqing,Tan, Jinhao,Yang, Wenqin,Zhang, Lianjun,Xia, Yuanguang,Zhou, Xiaojuan,Zhou, Jianjin,Zhu, Lin,Teng, Haiyun,Yang, Gui-an,Song, Yushou,Sun, Zhiji Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.6
Gadolinium oxysulfide (GOS) is regarded as a novel scintillator for the realization of ultra-high spatial resolution in neutron imaging. Monte Carlo simulations of GOS scintillator show that the capability of its spatial resolution is towards the micron level. Through the time-of-flight method, the light output of a GOS scintillator was measured to be 217 photons per captured neutron, ~100 times lower than that of a ZnS/LiF:Ag scintillator. A detector prototype has been developed to evaluate the imaging solution with the GOS scintillator by neutron beam tests. The measured spatial resolution is ~36 ㎛ (28 line pairs/mm) at the modulation transfer function (MTF) of 10%, mainly limited by the low experimental collimation ratio of the beamline. The weak light output of the GOS scintillator requires an enormous increase in the neutron flux to reduce the exposure time for practical applications.
Mengchen Zhang,Xu Cui,Qinglei Xiu,Jian Zhuang,Xuefeng Yang 한국정밀공학회 2023 International Journal of Precision Engineering and Vol.24 No.4
For the 4th generation synchrotron radiation source, the piezoelectric actuator (PEA) becomes the crucial component of the beam-line to guarantee the beam stability during the high accuracy experiments. However, the rate-dependent hysteresis seriously affects the accuracy of PEA. To eliminate this nonlinear error, we present a feedforward controller and an integrated controller. A novel Hammerstein model is proposed to describe the rate-dependent hysteresis of the PEA, which is composed of a static Preisach model and a dynamic transfer function. The insufficiency of the classic Preisach model in describing the nature of the zero drift of hysteresis loops is improved by inducing a correction item. Moreover, the identification and the inversion method of the dynamic model are proposed as well. Experiments on the commercial PEA demonstrate that the hysteresis with the frequency in range of 0–80 Hz is compensated more than 80% under the proposed control scheme.