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在实时传输的光谱仪数据采样中,通常存在采样时间间隔不等的现象,这使得实时传输光谱仪在一些特殊场合的应用受到较大的限制,如在预测能力更强,检测精度更高的动态光谱分析法中。而恰恰在动态光谱法等时间分辨光谱分析中对光谱信号的采样定时特性要求更高,时间间隔不等会直接影响光谱分析的结果,得到失真的结论。同时与一般采样所不同的是,光谱仪是一定时间的积分采样,这无形中增加了对光谱仪定时采样特性研究的难度。因此,巧妙地利用锯齿波的幅值与时间存在一线性编码的关系,对某一型号的光谱仪进行采样时间及采样时间间隔的测试与分析,测试表明采样时间与积分时间的设置相关,同时时间间隔与积分时间也息息相关,进一步探究了该型号光谱仪在不同积分时间下采样时间间隔波动的范围。研究对注重光谱时间特性的分析法提供积分时间选取的参考依据,同时也提出了一种评估动态时间特性的方法,有利于光谱的动态特性的评估与应用。 相似文献
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数学解题的关键是善于挖掘已知条件的内涵,并由此突破解题壁垒.在一些解析几何问题中,虽然从表面来看似乎与圆无关,但从定义、方程与性质的角度深挖下去,圆便会“浮出水面”.发现“隐圆”往往能帮助我们打开解题思路,成功到达彼岸. 相似文献
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Ultra-broadband polarization splitter based on graphene layer-filled dual-core photonic crystal fiber 下载免费PDF全文
An ultra-broadband polarization splitter based on graphene layer-filled dual-core photonic crystal fiber(GDC-PCF)that can work in a wavelength range from 1120 nm to 1730 nm is proposed in this paper. Through optimizing fiber configuration, the polarization splitter has an extinction ratio of-56.3 dB at 1.55 μm with a fiber length of 4.8 mm.Compared with the photonic crystal fiber reported splitters, to our knowledge, the GDC-PCF splitter with the extinction ratio below-20 dB has a super wide bandwidth of 610 nm. Due to the excellent splitting characteristics, the GDC-PCF will be used in coherent optical communication systems in a wavelength range from infrared to mid-infraed. 相似文献
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对HIRFL CSR的原形磁铁进行了试制和研究.尝试了一种新的改善磁场分布的方法:在不增大极头的条件下使用两根内置导线,实践证明是可行的.用OPERA 2D和TOSCA 3D软件分析了垫补电流对中、低场的影响,同时也介绍了这块C型二极磁铁的制作工艺及磁场测量结果. The C-type dipole prototypes in the injection beam line from a Separate Sector Cyclotron (SSC) to Cooling Storage Ring (CSR) are selected as R & D for CSR magnets fabrication, because they have large bending angle and small radius, and are very difficult to stack and fabricate. A method to obtain good field homogeneity has been attempted in the C-type dipole prototype. This method is not the enlarged dipole pole but two imbedded conductors and two small power supplies. This is easy operating.... 相似文献
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介绍了兰州重离子冷却储存环主环(CSRm)的改进W型二极磁铁和实验环(CSRe)C型二极磁铁的磁场计算和物理设计,在降低了磁铁造价和运行费用的前提下设计参数达到或超过了物理要求.根据样机的加工和检测结果来看,所有的磁场计算和物理设计的结果是可靠的.Magnetic field calculation and design of CSRm modified W-type dipoles and of CSRe C-type dipoles are presented in this paper. Under the condition of lower cost, all of the designed parameters are better than required values. Now the prototype has been fabricated and also the magnetic field measurement has been done. According to the measured results, all the calculation and design are very reliable. 相似文献
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