An optical system is described in which ultraviolet light from a suitable source is dispersed by a grating monochromator and focused on a specimen. Fluorescent light from the specimen passes through a second grating monochromator and is detected by a photomulitplier tube. The specimen is placed in a stand which rests on a kinematic trolley, by means of which the specimen is brought into focus and which allows stands with reference markings, an MgO surface, or a cold cell to be used.
The optical system is calibrated photometrically by means of a standarized tungsten-quartz lamp. The spectral sensitivity characteristics of the detecting photomultiplier, together with its associated monochromator and mirrors, are corrected by means of a cam driven in synchronism with the wavelenght drive drive of the detecting monochromator.
In order to cancel fluctuations in the exciting light source a fraction of the light emerging from the source monochromator is focused on to a second photomultiplier, whose output is used to operate a servo system. The recorded spectrum is thus a measure of the ratio of fluorescent to exciting light. The currents from the photomultipliers are amplified by dc amplifiers with silicon diode modulators, which are described.
© 1959 Optical Society of AmericaFull Article | PDF Article
OSA Recommended Articles
James H. Schulman and Clifford C. Klick
J. Opt. Soc. Am. 43(6) 516-519 (1953)
F. R. Lipsett, G. Bechthold, F. D. Blair, F. V. Cairns, and D. H. O’Hara
Appl. Opt. 9(6) 1312-1318 (1970)
D. F. Hornig, G. E. Hyde, and W. A. Adcock
J. Opt. Soc. Am. 40(8) 497-503 (1950)