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Light detecting apparatus and fluid measuring apparatus

  • US 9,237,856 B2
  • Filed: 06/24/2010
  • Issued: 01/19/2016
  • Est. Priority Date: 06/24/2010
  • Status: Active Grant
First Claim
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1. A light detecting apparatus for detecting a signal light component included in input light, said light detecting apparatus comprising:

  • an optical current transducer unit which includes first and second photoelectric conversion element units each converting the input light to an electric current and outputting it, and which outputs a differential current between an electric current outputted by the first photoelectric conversion element unit and an electric current outputted by the second photoelectric conversion element unit as a detected current; and

    a first current/voltage converting unit which amplifies the detected current outputted from said optical current transducer unit, converts it to a voltage signal, and outputs the voltage signal, whereinthe first and second photoelectric conversion element units are connected in series such that cathodes thereof or anode thereof are connected to each other, anda connection point between the first and second photoelectric conversion element units connected in series is floating.

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