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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 34, Iss. 7 — Mar. 1, 1995
  • pp: 1209–1214

Compact light-emitting-diode sun photometer for atmospheric optical depth measurements

Y. B. Acharya, A. Jayaraman, S. Ramachandran, and B. H. Subbaraya  »View Author Affiliations


Applied Optics, Vol. 34, Issue 7, pp. 1209-1214 (1995)
http://dx.doi.org/10.1364/AO.34.001209


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Abstract

A new compact light-emitting diode (LED) sun photometer, in which a LED is used as a spectrally selective photodetector as well as a nonlinear feedback element in the operational amplifier, has been developed. The output voltage that is proportional to the logarithm of the incident solar intensity permits the direct measurement of atmospheric optical depths in selected spectral bands. Measurements made over Ahmedabad, India, show good agreement, within a few percent, of optical depths derived with a LED as a photodetector in a linear mode and with a LED as both a photodetector and a feedback element in an operational amplifier in log mode. The optical depths are also found to compare well with those obtained simultaneously with a conventional filter photometer

© 1995 Optical Society of America

History
Original Manuscript: February 4, 1994
Revised Manuscript: May 23, 1994
Published: March 1, 1995

Citation
Y. B. Acharya, A. Jayaraman, S. Ramachandran, and B. H. Subbaraya, "Compact light-emitting-diode sun photometer for atmospheric optical depth measurements," Appl. Opt. 34, 1209-1214 (1995)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-34-7-1209


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References

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