OSA's Digital Library

Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 11, Iss. 2 — Aug. 1, 1925
  • pp: 113–116

Optics InfoBase > JOSA > Volume 11 > Issue 2 > PHOTOGRAPHIC SENSITOMETRY WITH FLUORESCENT OILS

PHOTOGRAPHIC SENSITOMETRY WITH FLUORESCENT OILS

GEORGE R. HARRISON

JOSA, Vol. 11, Issue 2, pp. 113-116 (1925)
http://dx.doi.org/10.1364/JOSA.11.000113


View Full Text Article

Acrobat PDF (939 KB)





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations

Abstract

The changes in sensitivity and contrast obtained when Cramer Contrast Process, Seed 23, and Wellington Super-Xtreme plates are coated with any one of five different fluorescent oils were studied in the region 2200–3800 A, for the purpose of improving the precision of photographic photometry in the region 2000–2400 A, and to investigate the feasibility of extending this method into the extreme ultraviolet. Characteristic curves are given for various plate-oil combinations, and some of the changes in sensitivity and contrast found are tabulated. The effect of thickness of coating was found to be great with most oils; certain oils gave the greatest improvement in sensitivity with thick coatings, and others with thin ones. The greatest sensitivity increase was found with a clear paraffin oil and contrast plates; the greatest contrast was found with a light lubricating oil and the same plates. A 400-fold gain in exposure time by oiling was found in certain cases. Some oils were found to increase the density produced by a certain intensity if the intensity exceeded a certain value, and to decrease it otherwise. This effect varies with wave length, so that it was found possible to decrease the sensitivity at longer wave lengths and increase it at shorter wave lengths, thus making the sensitivity curve of the plate more uniform throughout the spectrum. Although the chief effect with most oils is below 2400 A, certain varieties increase the contrast even up to 3800 A, although the sensitivity was generally decreased above 2500A. Oiled plates, when the oil coating is uniform, were found to be perfectly applicable to photographic photometry, accuracy to one per cent being readily attainable even at the shortest wave lengths studied. Sections of the “characteristic surface” in which the reciprocity law holds to within one per cent were found for several wave lengths, including 2200A.

Citation
GEORGE R. HARRISON, "PHOTOGRAPHIC SENSITOMETRY WITH FLUORESCENT OILS," J. Opt. Soc. Am. 11, 113-116 (1925)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-11-2-113


Sort:  Journal  |  Reset

References

  1. National Research Fellow.
  2. Harrison, Phys. Rev., 24, p. 466; 1924.
  3. Mees, Opt. Soc. Amer. Meeting, March 1925.
  4. Duclaux and Jeantet, Jour. de Phys., 2, p. 156; 1921.
  5. Lyman, Nature, 112, p. 202; 1923.
  6. Henri, Jour. de Phys., 3, p. 181; 1922.
  7. Harrison and Hesthal, this journal, 8, p. 471; 1924.
  8. Helmick, this journal, 9, p. 521; 1924.
  9. Harrison and Forbes, this journal, 10, p. 1; 1925.
  10. Harrison, this journal, 10, p. 157; 1925.

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  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited