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Noise contributions for imaging spectrometers.

J Nieke1, M Solbrig, A Neumann

  • 1Institute of Space Sensor Technology, Deutsches Zentrum für Luft und Raumfahrt, German Aerospace Center, D-12489 Berlin, Germany. jens.nieke@dlr.de

Applied Optics
|March 8, 2008
PubMed
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New imaging spectrometers use matrix detectors for Earth observation, capturing detailed spectral data. Analysis shows signal-to-noise ratio (SNR) degradation in these advanced Earth-viewing sensors due to image smear.

Area of Science:

  • Earth observation science
  • Optical remote sensing
  • Spectroscopy

Background:

  • Advanced imaging spectrometers utilize matrix detectors for comprehensive spectral data acquisition.
  • This contrasts with traditional line detectors that capture fewer, broader spectral bands.
  • The shift to two-dimensional solid-state imagers necessitates detailed signal-to-noise ratio (SNR) analysis.

Purpose of the Study:

  • To analyze the signal-to-noise ratio (SNR) performance of matrix detectors in Earth observation imaging spectrometers.
  • To simulate radiance variations for key Earth features like water and vegetation.
  • To quantify the impact of image smear on SNR in two-dimensional imaging systems.

Main Methods:

  • Simulated maximum and minimum radiances for water and vegetation spectral signatures.

Related Experiment Videos

  • Verified radiance data using modular optoelectronic scanner (MOS) data.
  • Calculated electron generation at the matrix detector for a hypothetical sensor.
  • Demonstrated SNR degradation caused by image smear in two-dimensional imagers.

    • Main Results:

    • Calculated electron signals for water-minimum and vegetation-maximum scenarios.
    • Quantified the degradation of SNR attributable to image smear.
    • Provided a basis for understanding the performance limitations of new imaging spectrometer technologies.

    Conclusions:

    • Matrix detectors offer enhanced spectral information for Earth observation.
    • Image smear significantly degrades the SNR in two-dimensional solid-state imagers.
    • Further research is needed to mitigate SNR loss in advanced imaging spectrometer designs.