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Applied Optics

Applied 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)

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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

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

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)

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  1. S. Twomey, Atmospheric Aerosols (Elsevier, New York, 1977).
  2. G. E. Shaw, “Sun photometry,” Bull. Am. Meteorol. Soc. 64, 4–10 (1983). [CrossRef]
  3. F. E. Volz, “Spectral sky light and solar radiance measurements in the Caribbean: maritime aerosols and Sahara dust,” J. Atmos. Sci. 27, 1041–1047 (1970). [CrossRef]
  4. E. C. Flowers, R. A. McCormick, K. R. Kurfis, “Atmospheric turbidity over the United States,” J. Appl. Meteorol. 8, 1961–1966 (1969). [CrossRef]
  5. A. Ångström, “Techniques for determining the turbidity of the atmosphere,” Tellus 13, 214–223 (1961). [CrossRef]
  6. H. Horvath, “Atmospheric light absorption—a review,” Atmos. Environ. A 27, 293–317 (1993). [CrossRef]
  7. G. A. d’Almeida, P. Koepke, E. P. Shettle, Atmospheric Aerosols: Global Climatology and Radiative Characteristics (Deepak, Hampton, Va., 1991).
  8. F. M. Mims, “Sun photometer with light emitting diodes as spectrally selective detectors,” Appl. Opt. 31, 6965–6967 (1992). [CrossRef]
  9. R. Lynch, The Role of Compositionally Graded GaAlAs Devices in Optical Communication (IBM Electronics Systems Center, New York, 1972).
  10. R. N. Misra, Y. B. Acharya, “Current ratio log amplifier using light emitting diodes,” Int. J. Electron. 53(1), 91–94 (1982). [CrossRef]
  11. S. Ramachandran, A. Jayaraman, Y. B. Acharya, B. H. Subbaraya, “Features of aerosol optical depths measured using sun-tracking photometer over Ahmedabad,” Atmos. Phys. 67, 57–70, 1994.

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