Item Details

Investigation of Responsivity and Noise in a Direct-Coupled Photodetector-Preamplifier for Facsimile Cameras

by W. Lane Kelly IV and Stephen J. Katzberg
Format
Book; Government Document; Online; EBook
Published
Washington, D.C. : National Aeronautics and Space Administration ; [Springfield, Va. : For sale by the National Technical Information Service], 1973.
Language
English
Series
NASA Technical Note
Summary
The direct-coupled (DC) mode of detector operation is evaluated for use in a facsimile camera. Photodiode-preamplifier sensitivity is described in terms of photodiode responsivity and possible noise sources resulting from the photodiode and preamplifier. Responsivity and noise limitations are experimentally verified and used to predict photodiode-preamplifier sensitivity under a wide range of operating conditions. Results demonstrate that the DC mode offers advantages in sensitivity and reduced mechanical complexity for facsimile cameras over the more common technique of chopping the radiation and ac amplifying the resultant signal.
Description
23 p. : ill. ; 27 cm.
Mode of access: Internet.
Notes
  • Prepared at Langley Research Center.
  • Cover title.
  • Includes bibliographical references (p. 16).
Series Statement
NASA technical note ; NASA TN D-7338
Logo for Copyright Not EvaluatedCopyright Not Evaluated
Technical Details

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    a| Investigation of responsivity and noise in a direct-coupled photodetector-preamplifier for facsimile cameras c| by W. Lane Kelly IV and Stephen J. Katzberg.
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    a| Washington, D.C. : b| National Aeronautics and Space Administration ; a| [Springfield, Va. : b| For sale by the National Technical Information Service], c| 1973.
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    a| 23 p. : b| ill. ; c| 27 cm.
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    a| NASA technical note ; v| NASA TN D-7338
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    a| Prepared at Langley Research Center.
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    a| Cover title.
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    a| Includes bibliographical references (p. 16).
    520
      
      
    a| The direct-coupled (DC) mode of detector operation is evaluated for use in a facsimile camera. Photodiode-preamplifier sensitivity is described in terms of photodiode responsivity and possible noise sources resulting from the photodiode and preamplifier. Responsivity and noise limitations are experimentally verified and used to predict photodiode-preamplifier sensitivity under a wide range of operating conditions. Results demonstrate that the DC mode offers advantages in sensitivity and reduced mechanical complexity for facsimile cameras over the more common technique of chopping the radiation and ac amplifying the resultant signal.
    538
      
      
    a| Mode of access: Internet.
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    a| Optical scanners.
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    a| Spectral sensitivity.
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    a| Photon detectors x| Noise.
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    a| Mars (Planet) x| Exploration x| Equipment and supplies.
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    a| Katzberg, S. J. q| (Stephen J.)
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    a| Langley Research Center.
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