自動デンシトメータ・コンパレータの試作
(I) 光電型ディジタルコンパレータ
1966 年 35 巻 12 号 p. 882-890
詳細
1966 年 35 巻 12 号 p. 882-890
A photoelectric comparator which automatically finds and measures locations of density maxima on a spectrum plate is described. A part of the projected image of the spectrum is oscillated by means of a rotating glass plate in front of the slit-detector assembly, while the photographic plate is slowly moved by a lead screw. The principle of determining the positions of density peaks is based on a coincidence method between two pulses, one of which is a peak pulse gene-rated by successive differentiation of the photoelectric output of the detector and the other is a fiducial pulse synchronized with the rotating scanner. The locations of spectral lines are displayed with a digital scaler and printer actuated by the coincidence pulses. The accuracy of the instru-ment, which is nearly one micron for regular runs, is better than that of the conventional type of comparator. This instrument is a particularly powerful tool in the field of spectrochemical analysis.
