OSA's Digital Library

Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 40, Iss. 7 — Jul. 1, 1950
  • pp: 409–411

An Integrating Photometer for Low Light Levels

HORACE W. BABCOCK  »View Author Affiliations


JOSA, Vol. 40, Issue 7, pp. 409-411 (1950)
http://dx.doi.org/10.1364/JOSA.40.000409


View Full Text Article

Acrobat PDF (345 KB)





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations

Abstract

Proper estimation of exposure times in astronomical spectroscopy is often difficult, largely because the quality of the stellar image is so dependent upon “seeing.” The integrating photometer described here, while not new in principle, functions with satisfactory sensitivity and stability on only two percent of the light transmitted by the slit of the coud6 spectrograph of the 100-inch telescope. When the meter indicates a predetermined number of counts, the finished spectrogram will have the proper density regardless of seeing, slit width, passing clouds, and efficiency of guiding.

Citation
HORACE W. BABCOCK, "An Integrating Photometer for Low Light Levels," J. Opt. Soc. Am. 40, 409-411 (1950)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-40-7-409

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited