共查询到17条相似文献,搜索用时 218 毫秒
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在常规的条状一维位置敏感探测器(PSD)中,光敏区和位置电阻区是结合在一起的,器件的欧姆接触电极难以做得比较理想,因此器件的位置准确度和线性度也受到了不利的影响。而在梳状一维位置敏感探测器中,光敏区和位置电阻区被分成了梳齿区和梳脊区两部分,并且位置电阻区被设计成很窄的长条,即使掺杂浓度比较高,位置电阻也能做得相当大。这样条状一维位置敏感探测器接触电极上的缺陷就可消除。用两种不同的一维位置敏感探测器所测量的位置特性曲线证实了理论分析的正确性。测量结果还表明,梳状一维位置敏感探测器的位置准确度和线性度比条状一维位置敏感探测器有了显著的提高,梳状一维位置敏感探测器的平均位置误差从条状一维位置敏感探测器的55μm减小到了26μm,梳状一维位置敏感探测器的均方根非线性度从条状一维位置敏感探测器的0.94%减小到了0.09%。 相似文献
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枕型二维位置敏感探测器的研制 总被引:4,自引:3,他引:1
证明了枕型二维位置敏感探测器设计的基本原理———Gear定理,并推导了适用于枕型二维位置敏感探测器的位置计算公式,此外还提出了枕型二维位置敏感探测器的制作工艺和测试结果。采用集成电路工艺所研制的枕型二维位置敏感探测器(光敏面为8 mm×8 mm)表现出良好的光电特性,当反偏为5 V时其暗电流约为15 nA,峰值时的光谱灵敏度超过了0.6 A/W。在所测量的 75%光敏区域内,均方根位置误差约为 0.135 mm,而以均方根位置误差表示的非线性度在1.1%左右,比四边形二维位置敏感探测器的位置线性度提高了近一个数量级。 相似文献
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30.4nm极紫外成像探测器的实验研究 总被引:6,自引:3,他引:3
报导了最新研制的30.4 nm极紫外成像探测器的实验研究结果.该探测器采用了楔条形阳极(WSA)、高增益v型级联微通道板组件、低噪声电子读出系统等先进技术,利用单光子计数成像技术在实验审成功获得了模拟图像.搭建了相应的实验系统,对探测器成像的线性度、空间分辨率、暗计数等性能进行了实验研究.结果表明,该探测器具有φ45 nm的有效面积,空间分辨率优于100μm,暗计数率低[0.4 count/(cm2·s]、成像线性度好、结构简单等优点. 相似文献
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为了在天基远距离条件下估计空间目标的姿态参数,提出了基于时序光谱信号分级求解目标表面参数及姿态参数的方法.第一级,在三轴稳定状态下将空间目标等效为"双面模型",引入双向反射分布函数(bidirectional reflectance distribution function, BRDF)的多级融合模型表征复杂材料的光谱反射特性,基于时谱信号与时谱信号模型对双面光谱BRDF与面积乘积进行重构.第二级,为了抑制双面耦合特性对姿态估计的影响,构建双面特性分离度,并基于该度量最大化实现光谱波段优选.第三级,构建目标姿态运动状态下的时序光谱信号模型,以模型值与观测值之间的误差为目标函数,利用Levenberg-Marquardt算法对姿态参数进行估计.仿真表明,该方法更适用于方形本体的目标,且反演误差会随相位角和探测器噪声的增大而增大,在信噪比SNR≥10条件下反演误差在2%以内. 相似文献
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The effect of spot size on linearity improvement of tetra-lateral position sensitive detector 总被引:1,自引:0,他引:1
Linearity improvement of tetra-lateral position sensitive detector (PSD) is highly desired in many applications where accurate measurements of the PSD are required. The effect of beam size on our newly proposed linearity improvement scheme is discussed in this paper. Theoretical studies on the electrical potential and collected photocurrents are presented to simplify the numerical calculation when the beam size of the spot is considered. Simulation results show that our new formula can still give a nearly perfect linearity and measurement accuracy even if the spot has a considerable beam size. 相似文献
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PSD位置响应特性与光源照射方式的关系研究 总被引:1,自引:1,他引:0
推导出在四边形二维PSD光源静止照射和连续扫描照射下的位置响应特性理论解,比较两种光源照射方式下引起相对位置变化,讨论了光源扫描速度对探测光入射位置信息的影响,得出结论:在两种光源照射方式下,二维PSD探测光入射位置存在严重的非线性,但是响应时间比一维PSD短。光源扫描速度越小,2DPSD探测到的位置误差越小,并且光生电势分布的最大值越小。 相似文献
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Myungkook Moon Changhee Lee Jongkyu Cheon Younghyun Choi Harkrho Kim Shraddha S. Desai 《Pramana》2008,71(5):1189-1195
Position sensitive detectors (PSD) measure the distribution of scattered neutrons and are essential tools for neutron scattering
experiments. Various types of neutron detectors used at neutron diffractometers are conventional tube detectors, 1-D and 2-D
PSDs. Korea Atomic Energy Research Institute (KAERI) has been developing various kinds of PSDs to improve the instrument performance
and to develop new scattering instruments. Our development work is initiated with 1-D PSD for residual stress analysis spectrometer
and finally the technology is extended to development of 2-D PSD with planar and curved geometry. All PSDs are based on multiwire
grid assembly with delay line readout method for position encoding, as the response is faster than charge division method
and enables higher count rate capability. Design details and operational characteristics of some of the PSDs developed, for
application at neutron scattering instruments are presented.
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A precise operation of the position-sensing detectors (PSD) is exploited in this study. A position-sensing detector is modeled and the amplified output signal for this device as a result of input source current variation is studied. Beam displacement on such detectors is calculated and approximated and more accurate expressions for the generated signals are obtained. Linearity effect in output response of such a device is also investigated. The expansion coefficients for the signals are determined, which show the effect of the nonlinear terms. The first nonlinear coefficient is about 16.6% of the linear coefficient while the next terms are 2.5, 0.89, and 0.48% of the linear coefficient, respectively. For a position change of x=0.2 unit the linear term is 0.08, the third-order term −0.005328, and the fifth-order term is only about 0.000032, which is negligible. To see the operational result, using software simulates a PSD and the related circuit that provides the positional information. 相似文献
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A powder diffractometer with a linear position sensitive detector (PSD) has been designed and fabricated at BARC. The system
is in operation at Dhruva reactor. The PSD has been tested for the position linearity and the uniformity of efficiency. The
resolution Δd/d of the diffractometer has been found to be 1·3%. The data can be analyzed using profile refinement technique. 相似文献