长立方体的整盘加工

长立方体的整盘加工是利用光胶加工较高精度的棱镜或平面镜所广泛采用的方法。其光胶工具一般包括长方体、立方体和光胶垫板。光胶垫板的制造是属于高精度平面加工的范畴,而长方体和立方体的加工方法又基本相同,所以我们就只着重讨论一下有关长方体的使用、技术要求及加工等问题。     

在分离器中借助辅助块修抛六面体棱镜的角度误差

<正> 六面体棱镜的相邻两个面及相隔二个面间的角度误差均有较高的要求,同时它的外形尺寸及同心度也有一定的要求。六面体棱镜的制造一般采用光胶上盘加工。当加工完的棱镜检验后有一个或几个角超差,而棱镜的外形尺寸及同心度要求不允许再对某个面重新光胶上盘研磨及抛光修正时,我们采用分离器修抛来修正角度误差,效果较好。     

光胶垫板主要技术指标的给定及应用

光胶垫板技术条件的给定,直接影响到光胶垫板的使用性能和加工效率。通过对其目前所应用规范的分析,指出对其修正的必要性,提出了较合理并经实践验证的有关技术条件,不但确保了使用性能,而且降低了加工和检测的难度,提高了加工效率。     

格兰-汤普森棱镜胶合层的膜效应分析

将格兰-汤普森棱镜两半块之间的光学胶合层作为一层薄膜，利用薄膜光学理论，分析了胶合层对棱镜透射比的影响。通过研究胶合层的厚度以及光学胶折射率对入射光在胶合界面上反射率的影响，得出了s偏振光经过格兰-汤普森棱镜后的透射比。结果表明：胶合层的厚度以及光学胶折射率对棱镜的透射比均有影响，且厚度对棱镜透射比的影响呈现周期性变化；而光学胶折射率则对透射比的振荡幅度产生影响。以长度孔径比为3的格兰-汤普森棱镜为例，光学胶折射率为1．510时，棱镜的透射比在92．5％～90．8％之间振荡；光学胶的折射率在接近e光主折射率1．475～1．495之间取值时，棱镜透射比的振荡幅度较小。这一结果有利于对格兰-汤普森棱镜性能的优化。     

五角棱镜的光束转向误差对波前测量的影响

从分析五角棱镜的角度制造误差产生的光学平行差入手，推导出确定入射光线和棱镜调整的表达式；利用棱镜转动定理建立了五角棱镜的光输出平面波前与其角度制造误差和导轨引起的运动误差之间的关系；并用计算机模拟试验分析了五角棱镜的角度制造误差和导轨引起的运动误差产生的扫描光束转向的波前误差。指出此研究结果有利于五角棱镜的加工和棱镜调整，还有利于大口径望远系统波前检测过程中扫描光束转向的波前误差的修正。     

斜方棱镜加工工艺的改进

图1所示的斜方棱镜,按以前的旧工艺,对要求并不高的1’30”平行差,还需要进行两次光胶修改,工艺流程冗长,操作繁难,机械损伤严重,合格率很低。为适应大量生产的需要,我们改进了加工方法。改进后,采用蜡胶代替原来的火漆和光胶胶盘,使斜方棱镜的产量和加工质量得到了极为显著的     

五角棱镜光束转向波前误差的分析与检测

从分析五角棱镜的角度制造误差产生的光学平行差入手,建立起五角棱镜的光输出平面波前与运动误差和角度制造误差产生的扫描激光束转向的波前改变量之间的关系.采用渥拉斯顿棱镜型双频激光干涉仪实时测量五角棱镜的运动误差,即可计算出扫描激光束转向的波前误差,以便在大型望远系统波前测量时对此误差加以修正.     

如何保证小尺寸光学零件高精度塔差的要求

本文就棱镜加工面很小和塔差精度要求特别高时的加工困难,用工件组合光胶上盘的新方法有效地提高了塔差精度。     

锥体棱镜的加工

本文简单地叙述了锥体棱镜两种加工工艺。重点介绍直接成型法加工中对角度误差~1″的控制。并提出了角度超差零件返修时的光胶方法。     

加工靴形棱镜屋脊角不手修

旭光仪器厂过去加工靴形棱镜的屋脊角,在机器抛光以后,还要进行手修。经过手修后方能达到2″,这种加工方式适应不了生产发展的需要。现在,经过学习“鞍钢宪法”,解放了思想,大胆革新,实现了机抛2″下盘,甩掉了手修。他们采取了下列几点措施: 1.由于长方体和光胶垫板的精度对保证2″屋     

关于"太阳在银河系中所受引力与到银心距离r的关系"的讨论

讨论了银道面内的引力场强分布和太阳在银河系中所受引力与到银心距离r的关系，指出引力场强g并不是与r的平方成反比，这是由于银河系的大小和形状不能忽略造成的．强调了万有引力定律的适用条件．     

On the predictability of the positions of the convergence zones in the ocean

The disagreement between the experimental and calculated positions of the first convergence zone are known from many publications. The most probable cause for such a disagreement, namely, the incorrect specification of the input data for the calculations, is considered. The lack of simultaneity between the hydrological surveys of the region and the acoustic experiments is emphasized. The experimental data obtained by the author in five ocean regions are presented. These data characterize the diurnal variability of the distance from the source to the nearest boundary of the convergence zone. The relations proposed by different researchers for calculating the sound speed from the temperature, salinity, and hydrostatic pressure are analyzed. It is shown that these relations lead to a substantial difference in the estimated depth dependence of the hydrostatic gradient of the sound speed. The position of the first convergence zone is calculated for the propagation conditions determined by vertical temperature and salinity profiles with the subsequent recalculation of these profiles into sound speed profiles by using eight different formulas known from the literature. It is shown that different formulas lead to different values of the distance to the first zone; this difference is substantially greater than that between the calculations and experiment. The necessity of improving the recalculation relations in view of the experimental data on sound propagation in natural oceanic waveguides, including the data on the actual positions of the convergence zones, is emphasized.     

On the calculation of the bremsstrahlung in the region of the plasma frequency

On the basis of the classical theory of radiation produced in incomplete Coulomb interaction, a formula is derived for the coefficient of the bremsstrahlung of fully ionized plasma. In the region of rectilinear approximation a comparison is made with the results of the quantum formula derived from the Born approximation. Furthermore, the influence of dispersion upon the emission coefficient is taken into account; some relations for the region of dispersion are given.     

Dependence of the Intensity of the Spectral Lines and the Composition of the Sample and the Plasma Parameters of the Unipolar Arc

The investigation was made of the dependence of the intensity of Tl, Ga, Mo, Mg, Mn, Sn, Bi, Ni, Zn, Pt and Au spectral lines and the plasma parameters (temperature T, electron concentration n_e, degree of 6 ionnization α) from concentration of lithium additive.     

Extracting the wavefunction of the LSP at the LHC

We consider associated production of squarks and gluinos with the lightest supersymmetric particle (LSP), or states nearly degenerate in mass with it. Though sub-dominant to pair production of color SU(3)-charged superpartners, these processes are directly sensitive to the wavefunction composition of the lightest neutralinos. Exploiting event-shape variables - including some introduced here for the first time - we are able to identify the composition of the LSP by selecting events involving a single high-pT jet recoiling against missing transverse energy. We illustrate the proposed technique on a set of benchmark cases and propose methods for applying these results in more realistic experimental environments.     

Set the controls for the heart of the Sun

In this paper we describe experiments conducted with high-power lasers that are attempting to replicate, for a very short time and in miniature, conditions found in the Sun. Experiments to date have reached conditions in the outer part of the Sun. To reach the Sun's centre requires compression of material to very much greater than solid density and heating to over ten million degrees. To achieve this, a new class of experiments and a new generation of high-power lasers are required.     

On the Question of the Source of the Apokamp

Technical Physics - The object of this work is the apokamp—a new type of plasma jet, which is formed from a bright offshoot emerging at the bending point of a channel of a high-voltage...