OSA's Digital Library

Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 8, Iss. 1 — Jan. 1, 1924
  • pp: 201–211

Optics InfoBase > JOSA > Volume 8 > Issue 1 > SOME TESTS OF THE PRECISION AND RELIABILITY OF MEASUREMENTS OF SPECTRAL TRANSMISSION BY THE KOENIG-MARTENS SPECTROPHOTOMETER

SOME TESTS OF THE PRECISION AND RELIABILITY OF MEASUREMENTS OF SPECTRAL TRANSMISSION BY THE KOENIG-MARTENS SPECTROPHOTOMETER

IRWIN G. PRIEST, H. J. McNICHOLAS, and M. KATHERINE FREHAFER

JOSA, Vol. 8, Issue 1, pp. 201-211 (1924)
http://dx.doi.org/10.1364/JOSA.8.000201


View Full Text Article

Acrobat PDF (1026 KB)





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations

Abstract

The Koenig-Martens spectrophotometer as installed and used at the Bureau of Standards has been tested by measuring the transmissions of rotating sectored disks of known angular aperture. Measurements of the spectral transmission of blue filters by different observers have also been compared. The photometric probable error at various wave-lengths has been computed from the observations of three different observers.

From the data, which are presented in considerable detail in tables and graphs, the following conclusions are drawn:

1. For heterogeneous illumination, the probable error of a single observation (involving one reading each of θ1 and θ2) is about seven tenths of one percent of the transmission when measurements are made at the field brightness most favorable to accurate matching.

2. For homogeneous illumination the probable error of a single observation of transmission 037 is nearly constant and equal to about one percent of the transmission in the case of the following wave-lengths of mercury and helium: mercury, 435.8, 546.1 mµ; helium, 447.2, 492.2, 501.6, 667.8, 706.5 mµ.

3. For heterogeneous illumination, the actual error2 of the mean of ten observations for transmissions even as low as 0.015 and for wave-lengths between 430 and 700 mµ is usually less than one percent of the transmission, provided the transmission is not changing rapidly with wave-length.

4. There is no systematic error of measured transm ssion with respect to wave-length.

Citation
IRWIN G. PRIEST, H. J. McNICHOLAS, and M. KATHERINE FREHAFER, "SOME TESTS OF THE PRECISION AND RELIABILITY OF MEASUREMENTS OF SPECTRAL TRANSMISSION BY THE KOENIG-MARTENS SPECTROPHOTOMETER," J. Opt. Soc. Am. 8, 201-211 (1924)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-8-1-201


Sort:  Author  |  Journal  |  Reset

References

  1. Paper presented at Eighth Annual Meeting Optical Society of America, Cleveland, Ohio, October 26, 1923. Published by permission of the Director of the Bureau of Standards, U. S. Department of Commerce, and the Director of the Munsell Research Laboratory. These tests were made incidental to the cooperative work on color standardization by the Bureau of Standards and the Munsell Color Company.
  2. Difference between measured value and true value as given by the angular calibration of the sectored disk.
  3. "A spectrophotometric table, derived from at least 25 points (for a continuous spectrum) gives the only unique description of a color, and it appears probable to the writer that the requirements of precision technical color measurement are most likely to be met by the development of simple and rapid means of plotting and recording accurate spectrum plots of reflection or transmission characteristics."—H. E. Ives, Jo. Frank. Inst. p. 700; Dec. 1915. Cf. also:—Troland: "Report of Colorimetry Committee," J. O. S. A. and R. S. I. 6, pp. 574–575; 1922 and Priest: Trans. I. E. S. 13, p. 41; 1918.
  4. "Color" being understood as "sensation." Cf. "Report of Colorimetry Committee," J. O. S. A. and R. S. I., 6, pp. 531–534; August, 1922.
  5. Matching of an unknown color by admixture of other known stimuli, as in trichromatic analysis, monochromatic analysis, and other methods.
  6. Arthur Koenig's Gesammelte Abhandlungen zur Physiologischen Optik, (Leipzig) pp. 116–139; 1903.
  7. Most of these tests were made in March, 1922. When the results were subsequently shown to Dr. A. H. Pfund in response to his inquiry as to the accuracy of our spectrophotometric work, he suggested that they ought to be made more generally available by publication.
  8. Ann. der Phy. (4) 12 pp. 984–1003; 1903. The instrument used in the present work was purchased from Schmidt & Haensch, the makers, about 1912.
  9. E. J. Brady. Trans. I. E. S. 9, pp. 937–952; 1914. H. E. Ives. Jour .Frank. Inst. 177, p. 496; 1914.
  10. The illumination apparatus of which the essential features are specified here, was that which has been continuously used with the Koenig-Martens spectrophotometer in the Colorimetry Section of the Bureau of Standards for about five or six years. Cf. B. S. Tech. Pap. 148, p. 5; B. S. Tech Pap. 167, p. 20; and B. S. Sci. Pap. 440, pp. 126–127 with Fig. 1.
  11. This is about one half the brightness of magnesium carbonate illuminated by the noon summer sun in a clear sky. It may be noted that much higher brightnesses are readily available for transmission measurements. For example, using a small white lined box containing two 400·watt lamps, it is possible to obtain a brightness of the order of one hundred lamberts. Such a source, which we are now installing, will greatly facilitate measurements for the longer and shorter wave-lengths and for samples of very low transmission. Such intense illumination is not feasible for reflection measurements.
  12. Cf. Ann. der Phy. (4) 12, p. 997; 1903
  13. Difference between measured value and true value as given by the angular calibration of the sectored disk.
  14. J. W. Mellor: "Higher Mathematics," 2nd Ed., p. 516.

Cited By

Alert me when this paper is cited

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.

« Previous Article

OSA is a member of CrossRef.

CrossCheck Deposited