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    • 93. 发明授权
    • Low thermal expansion modified cordierites
    • 低热膨胀改性堇青石
    • US4403017A
    • 1983-09-06
    • US325959
    • 1981-11-30
    • Jean-Marie Bind
    • Jean-Marie Bind
    • C04B35/195G02B1/02G02B5/08B32B9/04B32B13/04B32B17/00
    • G02B1/02C04B35/195G02B5/08
    • A modified cordierite (2MgO.2Al.sub.2 O.sub.3.5SiO.sub.2) composition in which at least a portion of the silicon dioxide is replaced with germanium oxide. These compositions have low thermal expansion, excellent formability and thermal shock resistance making them especially suitable for the manufacture of mirror substrates to be used at elevated temperatures. By selecting the proportion of germanium oxide according to the intended operating temperature, substantially zero thermal expansion can be achieved between room temperature and the selected operating temperature. Methods of manufacturing the material and of selecting the thermal expansion characteristics are also disclosed.
    • 一种改性的堇青石(2MgO.2Al2O3.5SiO2)组合物,其中二氧化硅的至少一部分被氧化锗置换。 这些组合物具有低热膨胀性,优异的成形性和耐热冲击性,使得它们特别适用于在高温下使用的镜面基板的制造。 通过根据预期操作温度选择氧化锗的比例,可以在室温和所选择的工作温度之间实现基本为零的热膨胀。 还公开了制造材料和选择热膨胀特性的方法。
    • 96. 发明授权
    • Method and apparatus for determining the nature of an unknown chemical
substance
    • 用于确定未知化学物质性质的方法和装置
    • US4365303A
    • 1982-12-21
    • US119237
    • 1980-02-07
    • Robert W. HannahJohn P. CoatesAbraham SavitzkyMichael A. FordHarry V. Carter
    • Robert W. HannahJohn P. CoatesAbraham SavitzkyMichael A. FordHarry V. Carter
    • G01N23/00G01J3/28G01N21/25G06F17/00G06F15/20G01N21/22
    • G01J3/28G06F19/703
    • Disclosed herein is method and apparatus for determining the nature of an unknown substance, which includes apparatus for entering a peak table of the spectrum of an unknown substance into computing apparatus, apparatus for adjusting the peak table to a first preselected standardized format, computing apparatus for comparing the so standardized peak table of the unknown with a first library of chemical structural units contained in memory in the computing apparatus, apparatus for making a list of the possible chemical structural units most closely corresponding to the unknown substance, apparatus for readjusting the peak table to a second preselected standardized format, apparatus for forming a file for the unknown substance including data corresponding to the readjusted peak table and to the list of possible chemical structural units, computing apparatus for comparing the file of the unknown substance with a second library containing files of known substances contained in memory in the computing apparatus, each known substance having a file containing data corresponding to its respective peak table in the second standardized format and to its respective chemical structural unit, and apparatus for outputting a list of known substances which most closely correspond to the unknown substance. In a form of the invention, apparatus is provided for adding data corresponding to a known substance to the second library contained in memory in the computing apparatus.
    • 本文公开了用于确定未知物质性质的方法和装置,其包括用于将未知物质的谱的峰值表输入计算装置的装置,用于将峰值表调整为第一预选标准格式的装置,用于 将未知的标准化峰值表与计算装置中的存储器中包含的第一化学结构单元库进行比较,用于制作与未知物质最接近的可能化学结构单元的列表的装置,用于重新调整峰表的装置 到第二预选标准格式,用于形成用于未知物质的文件的装置,包括对应于重新调整的峰值表的数据和可能的化学结构单元的列表,用于将未知物质的文件与包含文件的第二库进行比较的计算装置 的记忆中所含的已知物质 e计算装置,每个已知物质具有包含对应于其相应于第二标准化格式的峰值表的数据的文件及其各自的化学结构单元,以及用于输出与未知物质最接近的已知物质的列表的装置。 以本发明的形式,提供了用于将对应于已知物质的数据添加到计算装置中的存储器中包含的第二库的装置。
    • 98. 发明授权
    • Single element spherical surfaced optics insensitive to wavelength and
temperature
    • 单元素球形表面光学对波长和温度不敏感
    • US4344676A
    • 1982-08-17
    • US117032
    • 1980-01-31
    • David R. Shafer
    • David R. Shafer
    • G02B3/00G02B17/08G02B17/00
    • G02B17/086G02B17/08G02B17/0808G02B17/0812G02B17/0856G02B3/00
    • These thick elements are all corrected for third order spherical aberration and they are also corrected for spherochromatism (i.e. chromatic variation of spherical aberration) or longitudinal color or both. Most are preferably made of materials of low index of refraction less than 1.55, such as BK-7 or fused silica.Most elements corrected for third order spherical and spherochromatism exhibit longitudinal color, but this poses no problem when they are used with a single wavelength laser. Such systems can be used to focus a laser beam to provide a very fast f number diffraction-limited point source, or used in optical testing, experiments, and the like. The designs are characterized by an extremely low sensitivity of performance to wavelength changes and thus to uniform temperature changes (thermal soaks). A temperature change of several hundred degrees centigrade--from cryogenic temperatures up to near the melting point of the optics, has essentially no effect on the predicted performance. Since the systems have no aspheric surfaces, they are substantially less expensive than fast f number parabolic mirrors, which would also provide point sources. The systems are also less alignment sensitive than parabolas of the same f number.Several systems have low fifth order spherical aberration which can be fully corrected if divided into two elements.Other systems useful in interferometric testing with lasers are described. Some employ multiple passes through a single optical element. These may be corrected for third spherical aberration, longitudinal color, and spherochromatism. Such an element with an index of 1.71 is described.
    • 这些厚元件都被校正为三阶球面像差,并且它们也被校正为球面色差(即球面像差的色差)或纵向颜色或两者。 大多数优选由低折射率小于1.55的材料制成,例如BK-7或熔融石英。 大多数针对三阶球面和球面色差校正的元素显示纵向颜色,但是当它们与单波长激光器一起使用时,这并不存在问题。 这种系统可用于聚焦激光束以提供非常快的f数衍射限制点光源,或用于光学测试,实验等。 这些设计的特征在于对波长变化的性能极低的灵敏度,从而使温度变化均匀(热浸)。 几百摄氏度的温度从低温到高于光学元件的熔点,对预测的性能基本上没有影响。 由于系统不具有非球面,因此它们比快速数量的抛物面反射镜便宜得多,这也将提供点源。 该系统对于相同f数的抛物线也较少对齐。 几个系统具有低的五阶球面像差,如果分成两个元件,则可以完全校正。 描述了可用于使用激光器进行干涉测试的其它系统。 有些采用多次通过单个光学元件。 这些可以针对第三球面像差,纵向颜色和球状染色来校正。 描述了索引为1.71的元素。