公开(公告)号：US3659945A

公开(公告)日：1972-05-02

申请号：US3659945D

申请日：1969-11-19

Applicant: PERKIN ELMER CORP

Inventor： ROCHE JOHN M ,  SAWYER RENE C JR

IPC: G01J3/06 ,  G01J3/12 ,  G01J3/18

CPC classification number: G01J3/06 ,  G01J3/0235 ,  G01J3/12 ,  G01J3/18 ,  G01J2003/1204 ,  G01J2003/1828

Abstract: A scanning monochromator includes a plurality of diffraction gratings mounted on a rotatable turret, so that each grating may be moved and precisely indexed into operative position. Each grating so positioned is angularly rotated about its axis by the same scanning arm, driven by a cam having two similar (but different) contours for producing one of two similar scanning functions for the various gratings. Preferably more interchangeable order-separating filters than gratings are included to insure complete and efficient filtering (e.g., 14 filters for 7 gratings). Both the stepping of the grating turret and of the filters (e.g., on a filter wheel) are controlled by (digital) signals, derived from the actual wavenumber being separated, as precisely read by (coarse and fine) digital encoder discs on the wavenumber scanning driving shafts (before and after a large-ratio reduction system). The digital control signals and a signal indicating the operative grating provide a readout of the wavenumber, directly usable by data processing apparatus. The closed loop digital nature of the control signals are free of any non-systematic errors, and allow the instrument to be ''''indexed'''' to any desired wavenumber (and then ''''instructed'''' to scan to any other wavenumber automatically).

Abstract translation: 扫描单色仪包括安装在可旋转转台上的多个衍射光栅，使得每个光栅可以移动并精确地分度到操作位置。 如此定位的每个光栅通过相同的扫描臂围绕其轴线成角度地旋转，由具有两个相似（但不同的）轮廓的凸轮驱动，用于产生用于各种光栅的两个类似的扫描功能之一。 优选地，包括比光栅更可互换的顺序分离滤光器以确保完全和有效的滤光（例如，用于7个光栅的14个滤光器）。 光栅转塔和滤光片的步进（例如，滤光轮）都由（数字）信号控制，由实际波数分离得出，由数字编码器光盘上的（粗和精）数位精确读取 扫描驱动轴（大减速系统前后）。 数字控制信号和指示操作光栅的信号提供可由数据处理装置直接使用的波数的读出。 控制信号的闭环数字性质没有任何非系统误差，并允许仪器“索引”到任何所需的波数（然后“指示”自动扫描到任何其他波数）。