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Abstract

A photosensor and its associated electronics for use in fringe counting must fulfil several functions, viz.,
  1. (i)

    it must be capable of recognising the presence or absence of a fringe; that is, it must be able to distinguish between the light and dark (i.e. ambient) regions produced by the associated optical system;

     
  2. (ii)

    It must also operate down to d.c. in cases where the fringes can form a stationary pattern (and where chopper, or a.c. carrier, techniques are not used); and

     
  3. (iii)

    It must be sufficiently fast in operation to make possible the counting of fringes which appear at the highest frequency dictated by the system involved.

     

Keywords

Leakage Current Electric Field Gradient Shot Noise Operational Amplifier Noise Equivalent Power 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Applied Science Publishers Ltd 1983

Authors and Affiliations

  • J. Watson
    • 1
  1. 1.Department of Electrical and Electronic EngineeringUniversity CollegeSwanseaUK

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