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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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Optical hole sensing using fiber optics.

W L Stahl1, R J Potter

  • 1IBM Corporation, Systems Development Laboratory, Kingston, New York, USA.

Applied Optics
|January 6, 2010
PubMed
Summary
This summary is machine-generated.

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Fiber optics enable reliable punched card data processing by illuminating holes for phototransistors. This technology enhances efficiency in card verifiers and provides digital signals for accurate machine timing.

Area of Science:

  • Optoelectronics
  • Data Processing Technology
  • Fiber Optics Applications

Background:

  • Traditional punched card readers face challenges in reliability and efficiency.
  • Illuminating punched card holes is crucial for accurate data sensing.
  • Existing methods may lack the precision required for modern data processing.

Purpose of the Study:

  • To demonstrate the application of fiber optics in punched card reading stations.
  • To present a reliable and efficient method for sensing holes in punched cards using fiber optics.
  • To adapt fiber optic technology for use in the IBM 59 Card Verifier.

Main Methods:

  • Utilizing flexible, incoherently oriented fiber optic bundles to illuminate card holes.
  • Employing phototransistors to detect light transmitted through open holes.

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  • Integrating a mechanical light chopper with fiber optics for machine timing.
  • Implementing an electronic circuit to latch reed relays for digital signal output.

    • Main Results:

    • Fiber optics provide a reliable and efficient method for sensing punched card holes.
    • Phototransistors coupled with fiber optics accurately detect light through card perforations.
    • The system generates digital signals, improving data processing accuracy over analog ratios.
    • Fiber optic components are successfully integrated into the IBM 59 Card Verifier.

    Conclusions:

    • Fiber optics offer a practical and effective solution for punched card data processing.
    • The described system enhances the reliability and efficiency of card reading stations.
    • Digital signal generation through fiber optics improves data integrity and machine timing.