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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 42, Iss. 24 — Aug. 20, 2003
  • pp: 4793–4801

Digital frame averaging and dark mapping for a video-based underwater imaging spectrometer system

Karl D. Moore  »View Author Affiliations


Applied Optics, Vol. 42, Issue 24, pp. 4793-4801 (2003)
http://dx.doi.org/10.1364/AO.42.004793


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Abstract

A solid-state video camera is used as the focal plane detector in an underwater spectrometer system to acquire multiple spectra simultaneously within the water column. Signal-to-noise enhancement of the spectra is accomplished by use of a combination of frame averaging and dark field mapping so that the dynamic range of the individual frame can be increased from ∼7 bits to >13.5 bits. This method also removes the need for shuttering to determine the dark background or device cooling to reduce the dark current noise. The dark mapping algorithm is shown to be valid over a range of device temperatures so that the detector can vary freely with the ambient water temperature without loss in mapping accuracy. Despite observation times that can be up to an order of magnitude greater than cooled devices, the use of frame averaging and dark mapping eliminates the need for additional detector cooldown time and can provide a smaller, simpler, more power efficient, and robust design.

© 2003 Optical Society of America

OCIS Codes
(000.2170) General : Equipment and techniques
(010.4450) Atmospheric and oceanic optics : Oceanic optics
(040.1520) Detectors : CCD, charge-coupled device
(040.7290) Detectors : Video
(100.2000) Image processing : Digital image processing
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation

History
Original Manuscript: November 7, 2002
Revised Manuscript: May 6, 2003
Published: August 20, 2003

Citation
Karl D. Moore, "Digital frame averaging and dark mapping for a video-based underwater imaging spectrometer system," Appl. Opt. 42, 4793-4801 (2003)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-42-24-4793


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References

  1. D. A. Neuschuler, R. C. Booth, J. H. Morrow, “Innovative applications of optical fibers in the measurement of in situ spectra,” in Ocean Optics XI, G. D. Gilbert, ed., Proc. SPIE1750, 338–353 (1992).
  2. C. Hu, K. J. Voss, “In situ measurements of Raman scattering in clear ocean water,” Appl. Opt. 36, 6962–6967 (1997). [CrossRef]
  3. A. R. Weeks, I. S. Robinson, J. N. Schwarz, K. T. Trundle, “The Southampton underwater multiparameter optical-fibre spectrometer system (SUMOSS),” Meas. Sci. Technol. 10, 1168–1177 (1999). [CrossRef]
  4. K. D. Moore, “In situ spectral radiometer for the characterization of the optical properties of marine waters,” Ph.D. dissertation (National University of Ireland, Dublin, Ireland, 1993).
  5. K. D. Moore, E. O’Mongain, S. Plunkett, R. Doerffer, M. Bree, “In situ marine spectral radiometer using frame addition techniques and its calibration,” in Underwater Light Measurements, H. Eilertsen, ed., Proc. SPIE2048, 153–165 (1993).
  6. E. O’Mongain, D. Buckton, S. Green, M. Bree, K. Moore, R. Doerrfer, S. Danaher, H. Hakvoort, J. Kennedy, J. Fischer, F. Fell, D. Papantoniou, M. McGarrigle, “Spectral absorption coefficient measured in situ in the North Sea with a marine radiometric spectrometer system,” Appl. Opt. 36, 5162–5167 (1997). [CrossRef] [PubMed]
  7. K. J. Voss, A. Chapin, M. Monti, H. Zhang, “Instrument to measure the bidirectional reflectance distribution function of surfaces,” Appl. Opt. 39, 6197–6206 (2000). [CrossRef]
  8. J. D. E. Beynon, D. R. Lamb, Charge Coupled Devices and Their Applications (McGraw-Hill, London, 1980).
  9. M. O’Malley, E. O’Mongain, “Charge-coupled devices: frame adding as an alternative to long integration times and cooling,” Opt. Eng. 31, 522–526 (1992). [CrossRef]
  10. A. Gershun, “The light field,” J. Math. Phys. 18, 51–151 (1939).
  11. E. Aas, “Two-stream irradiance model for deep waters,” Appl. Opt. 26, 2095–2101 (1987). [CrossRef] [PubMed]
  12. J. L. Mueller, R. W. Austin, “Ocean optics protocols for SeaWiFS validation,” in SeaWiFS Project Technical Report Series, , Vol. 5, S. B. Hooker, E. R. Firestone, eds. (NASA Goddard Space Flight Center, Greenbelt, Md., 1992).
  13. O. H. Y. Zalloum, “Design of a modern optical fibre spectral transmissometer and a 120 degrees scattering meter,” J. Opt. 29, 53–62 (1998). [CrossRef]
  14. J. R. Janesick, Scientific Charged-Coupled Devices, Vol. PM 83 of SPIE Press Monograph Series (SPIE Press, Bellingham, Wash., 2000).
  15. R. W. Holmes, “The Secchi disk in turbid coastal waters,” Limnol. Oceanogr. 15, 688–694 (1970). [CrossRef]
  16. K. D. Moore, K. J. Voss, H. R. Gordon, “Spectral reflectance of whitecaps: instrumentation, calibration, and performance in coastal waters,” J. Atmos. Oceanic Technol. 15, 496–509 (1998). [CrossRef]
  17. E. O’Mongain, Spectral Signatures Ltd, Roebuck, Belfield, Dublin 4, Ireland (personal communication, 2003).
  18. R. C. Smith, K. S. Baker, “The bio-optical state of ocean waters and remote sensing,” Limnol. Oceanogr. 23, 247–259 (1978). [CrossRef]
  19. M. G. Bulmer, Principles of Statistics (Dover, New York, 1979).

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