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An Automatic Recording Spectrophotometer

机译：自动记录分光光度计

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A National Technical Laboratories Model DU Quartz Spectrophotometer has been converted into an automatic recording spectrophotometer by (a) utilizing the monochromator with unchanged optics, (b) introducing a common motor drive for the wave‐length and all mechanical parts, (c) dividing the exit beam into two parts by a beam‐splitter, (d) using a ``blank'' absorption cell in one beam and a ``sample'' absorption cell in the other, (e) placing an amplifier photo‐tube in each exit beam to measure the transmitted light, (f) amplifying the photo‐tube signals with linear cathode‐follower type d.c. amplifiers, (g) recording the ratio of the amplifier outputs as percent transmission of the ``sample'' relative to the ``blank'' as a function of wave‐length on a ratio potentiometer strip‐chart recorder, (h) providing for automatic monitoring of the monochromator slits to maintain constant energy in the ``blank'' light beam, and (i) providing a ``correction device'' for automatic correction of all errors due to mis‐matching in the relative intensities of the beams from the beam‐splitter, in the transmission characteristics of the absorption cells, and in the spectral sensitivity characteristics of the photo‐tubes. The instrument which has been developed has considerably greater resolution than the original spectrophotometer, has completely automatic high speed operation which permits recording of the spectrum from 4000 to 2000 angstroms in less than 15 minutes, and has an accuracy of transmission measurement very nearly equal to that obtainable with the original manual instrument.
机译：美国国家技术实验室DU型石英分光光度计已通过以下方式转换为自动记录分光光度计：（a）使用光学不变的单色仪，（b）为波长和所有机械部件引入通用的电机驱动器，（c）将通过分束器将光束分成两部分;（d）在一个光束中使用一个``空白''吸收池，在另一个光束中使用一个``样本''吸收池，（e）在每个中放置一个放大器光电管出射光束以测量透射光，（f）用线性阴极跟随器型dc放大光电管信号放大器，（g）在比率电位计带状图记录仪上记录放大器输出的比率，作为``样本''相对于``空白''的透射率，作为波长的函数，（h）提供用于自动监测单色仪狭缝，以保持``空白''光束中的能量恒定，并且（i）提供一个``校正装置''，用于自动校正由于相对强度不匹配而导致的所有误差。来自分束器的光束，吸收池的透射特性以及光电管的光谱灵敏度特性。与原始分光光度计相比，已开发的仪器具有更高的分辨率，具有全自动高速操作功能，可在不到15分钟的时间内记录4000至2000埃的光谱，并且透射测量的精度几乎与之相当。可使用原始手动仪器获得。

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