Abstract

A system permitting the automatic recording of ultraviolet and visible reflection spectra has been constructed, In which a function generating potentiometer, operating in synchronism with the wavelength drive of a conventional spectral reflectance apparatus, attenuates the phototube output to compensate for the spectral distribution of the light source, the wavelength dependence of the monochromator transmission, and the spectral sensitivity of the phototube. The potentiometer is tapped at points corresponding to about 100A intervals from 2200A to 7000A, and the resistances between taps are adjusted to give a constant recorder deflection when MgO is used as a sample. Once the potentiometer has been adjusted in this way, a direct record of spectral reflectance of an “unknown” sample is obtainable in a few minutes.

© 1953 Optical Society of America

Full Article  |  PDF Article

References

  • View by:
  • |
  • |
  • |

  1. G. A. Korn, Rev. Sci. Instr. 21, 77 (1950).
    [Crossref]
  2. Klick, Stokes, and Schumacher, Rev. Sci. Instr. 22, 776 (1951).
    [Crossref]

1951 (1)

Klick, Stokes, and Schumacher, Rev. Sci. Instr. 22, 776 (1951).
[Crossref]

1950 (1)

G. A. Korn, Rev. Sci. Instr. 21, 77 (1950).
[Crossref]

Klick,

Klick, Stokes, and Schumacher, Rev. Sci. Instr. 22, 776 (1951).
[Crossref]

Korn, G. A.

G. A. Korn, Rev. Sci. Instr. 21, 77 (1950).
[Crossref]

Schumacher,

Klick, Stokes, and Schumacher, Rev. Sci. Instr. 22, 776 (1951).
[Crossref]

Stokes,

Klick, Stokes, and Schumacher, Rev. Sci. Instr. 22, 776 (1951).
[Crossref]

Rev. Sci. Instr. (2)

G. A. Korn, Rev. Sci. Instr. 21, 77 (1950).
[Crossref]

Klick, Stokes, and Schumacher, Rev. Sci. Instr. 22, 776 (1951).
[Crossref]

Cited By

OSA participates in Crossref's Cited-By Linking service. Citing articles from OSA journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (5)

Fig. 1
Fig. 1

Schematic diagram of apparatus. M Beckman monochromator; λ monochromator wavelength drive; F motor; L lamp housing; H1, H2 sample holders; P photomultiplier housing; K function-generating potentiometer (Helipot plus adjustment network); SBP G.E. self-balancing potentiometer; R Esterline-Angus 5-ma recorder; A dc amplifier; and V power supply for photomulitiplier.

Fig. 2
Fig. 2

Sample holders.

Fig. 3
Fig. 3

Function-generating potentiometer circuit. (Adjustment network consists of 40 potentiometers connected as in R.)

Fig. 4
Fig. 4

Chart record of response to light reflected from MgO vs wavelength. (A) Signal from amplifier fed directly to recorder; (B) Signal from amplifier corrected by function-generating potentiometer. Amplifier gain differs for curves (A) and (B). Operating conditions for curve (B) given in Table I, column B.

Fig. 5
Fig. 5

Chart records of ultraviolet reflection spectra of phosphors. (A) CaSiO3:(Pb, Mn); (B) NaCl:(Pb, Mn); (C) KCl:Tl: absorption peak (reflection minimum at 2500A); fluorescence emission peak (reflection maximum) at 3000A. MgO reflection spectrum, with which the above should be compared, is given in Figure 4, curve B.

Tables (1)

Tables Icon

Table I MgO powder plaque either at entrance or exit slit.