公开(公告)号：US4734187A

公开(公告)日：1988-03-29

申请号：US874189

申请日：1986-06-13

Applicant: William Visentin ,  William T. Casey, Jr.

Inventor： William Visentin ,  William T. Casey, Jr.

IPC: G01N30/32 ,  G01N30/34 ,  G01N30/36 ,  B01D15/08

CPC classification number: G01N30/34 ,  G01N30/36 ,  G01N2030/326

Abstract: A gradient cam is used in an HPLC pump for controlling proportions of HPLC solvents on the low pressure side of the pump. The gradient cam is not concentric, and has an upward or draw slope along 190.degree. of its circumference and a downward or thrust slope along 170.degree. of its circumference. In operation, the cam is designed to be used with two followers, located 180.degree. apart, which follow along the cam's gradient. The unique cut of the cam insures a constant suction on the inlet or suction side of the cam during the entire pump cycle. During the 20.degree. period of the cycle in which both followers are simultaneously on the 190.degree. suction ridge, the slope of that portion of the gradient is one half of that of the remaining portion of the 190.degree. portion. The gradient cam provides both linear draw and output pressure.

Abstract translation: 在HPLC泵中使用梯度凸轮来控制泵的低压侧的HPLC溶剂的比例。 梯度凸轮不是同心的，并且沿其圆周的190°具有向上或者倾斜的斜面，并且沿其圆周的170°具有向下或推力斜面。 在操作中，凸轮被设计成与两个追随者一起使用，分别位于180度，沿着凸轮的坡度。 在整个泵循环期间，凸轮的独特切割确保在凸轮的入口侧或吸入侧上恒定的吸力。 在两个追随者同时处于190°吸力脊的循环的20°周期中，该部分梯度的斜率是190°部分剩余部分的斜率的一半。 渐变凸轮提供线性拉伸和输出压力。

公开(公告)号：US4601582A

公开(公告)日：1986-07-22

申请号：US800903

申请日：1985-11-22

Applicant: William T. Casey, Jr.

Inventor： William T. Casey, Jr.

IPC: F21V19/04 ,  G01J1/16 ,  G01N21/03 ,  G01N21/05 ,  G01N21/25 ,  G01N21/85 ,  G01J3/51 ,  G01N21/33

CPC classification number: G01N21/255 ,  F21V19/04 ,  G01J1/1626 ,  G01J2001/161 ,  G01N21/0317 ,  G01N21/05 ,  G01N21/85

Abstract: A spectrophotometer is shown in which a deuterium lamp emits a plurality of frequencies of interest the beam passes through a filter for selecting the wavelength of the light desired to be incident onto the sample and then onto a beam splitting plate which diverts a relatively small friction of the beam to a first reference photocell. The remaining portion of the beam then is incident directly on a sample tube. The sample tube may be so designed that its transparent walls form a lens focusing the beam on the sample to be tested. The beam then passes through the further wall of the sample tube and is detected by a second testing photocell, the output of which may be compared to the output of the reference photocell to provide a signal indicative of the relative amplitude of the testing beam. The reference photocell may be used to insure that the intensity of the beam incident on the beam splitter remains constant over time so that values output by the testing photocell may be comparable to measurements taken at a later time, without the use of a reference sample for calibration purposes. A sample cell is provided which allows the use of the instrument of the invention in on-line applications in high pressure systems. A particularly preferred method of mounting the deuterium bulb is also shown.

Abstract translation: 示出了分光光度计，其中氘灯发射多个感兴趣的频率，光束通过滤光器，用于选择期望入射到样品上的光的波长，然后到达分束板，该分束板将相对较小的摩擦转移 光束到第一参考光电管。 然后光束的剩余部分直接入射到样品管上。 样品管可以被设计成使得其透明壁形成将光束聚焦在要测试的样品上的透镜。 然后光束通过样品管的另一壁，并由第二测试光电池检测，其输出可以与参考光电管的输出进行比较，以提供指示测试光束的相对幅度的信号。 参考光电池可以用于确保入射到分束器上的光束的强度随时间保持恒定，使得由测试光电池输出的值可以与以后的测量值相当，而不使用参考样品 校准目的。 提供了一种样品池，其允许在高压系统中使用本发明的仪器在线应用。 还示出了安装氘灯泡的特别优选的方法。