排序方式: 共有7条查询结果,搜索用时 500 毫秒
1
1.
为了同时对长焦透镜的面形和焦距进行高精度检测,提出在Zygo干涉仪的球面光路中加入一个二元衍射元件作为检测件的计算全息法。 首先对计算全息法检测长焦透镜的面形和焦距进行了理论推导,并给出焦距误差公式。在Zemax中使用在平面基底上制作的二元衍射元件对一个长焦透镜的面形和焦距进行了模拟检测,其中对该长焦透镜面形的干涉检测PV值为0.0034λ,对焦距的检测精度为-0.11%。最后详细分析了两类误差对检测结果的影响,其中光学元件的位置误差影响不超过0.1λ;二元衍射元件的制造误差影响约0.01λ,在具体制造过程中,其径向位置误差和台阶误差可分别在2 μm和5 nm之内。在综合考虑各项误差的情况下,该方法的检测精度仍然可控制在2λ/25之内。 相似文献
2.
3.
采用水热法制备了均匀、单分散的BaF2∶Tb3+纳米粒子,并采用离子交换法制备了水杨酸钠敏化的BaF2∶Tb3+纳米粒子(SS-BaF2∶Tb3+)。 系统地研究了样品的结构、形貌和光致发光性质。 结果表明,监测Tb3+离子在547 nm的5D4→7F5跃迁,SS-BaF2∶Tb3+纳米粒子获得了从200 nm到385 nm波长范围宽的激发带;激发SS的π-π*电子跃迁吸收,由于SS到Tb3+的能量传递(“天线效应”),SS-BaF2∶Tb3+纳米粒子产生了增强的Tb3+离子绿光发射;敏化纳米粒子中Tb3+离子光致发光寿命比未敏化纳米粒子中Tb3+离子寿命长。 相似文献
4.
提出了在球面光路中利用凹球面反射镜同时测量长焦透镜焦距和透射波前的干涉检测方法,分析了该检测方法的误差以及测量误差和调整误差对检测结果的影响,确定了在检测过程中所需控制的相对敏感自由度。结果表明,该检测方法可对F/#≥50的透镜进行检测,其焦距计算相对误差为0.2%,透射波前P-V值可达1/25λ。 相似文献
5.
6.
采用水热法制备了均匀、单分散的BaF_2: Tb~(3+)纳米粒子,并采用离子交换法制备了水杨酸钠敏化的BaF2∶Tb3+纳米粒子(SS-BaF_2: Tb~(3+))。系统地研究了样品的结构、形貌和光致发光性质。结果表明,监测Tb~(3+)离子在547 nm的~5D_4→~7F_5跃迁,SS-BaF_2: Tb~(3+)纳米粒子获得了从200 nm到385 nm波长范围宽的激发带;激发SS的π-π*电子跃迁吸收,由于SS到Tb3+的能量传递("天线效应"),SS-BaF_2: Tb~(3+)纳米粒子产生了增强的Tb~(3+)离子绿光发射;敏化纳米粒子中Tb~(3+)离子光致发光寿命比未敏化纳米粒子中Tb3+离子寿命长。 相似文献
7.
The compound diffractive telescope is a novel space optical
system which combines the structure of compound eyes with
diffractive optics and so it has a lighter weight, a wider field of
view (FOV), a lower cost as well as looser fabrication tolerance. In
this paper, the design of a compound diffractive telescope
composed of one primary lens and twenty-one eyepieces is
introduced. Then the influence of diffraction orders on the
performance of the system is analysed. A modified phase function
model of diffractive optics is proposed to analyse the modulation
transfer function (MTF) curves for 0℃ FOV, which provides a
more accurate prediction of the performance of the system. In
addition, an optimized mechanism is also proposed to suppress stray
light. The star image and resolution tests show that the system can
achieve diffraction limit imaging within ± 2℃ of FOV and
±4~mm of eccentricity. Finally, a series of pictures of an object
are taken from different channels, and the splicing of pictures from
adjacent FOVs is demonstrated. In summary, the designed system has
been proved to have great potential applications. 相似文献
1