Light detecting apparatus and fluid measuring apparatus
First Claim
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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Accused Products
Abstract
A light detecting apparatus includes: a first photoelectric conversion element unit (110) and a second photoelectric conversion element unit (120) each of which converts input light to an electric current and output it; an optical current transducer unit (100) for outputting, as a detected current, 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; and a first current/voltage converting unit (200) for amplifying the detected current outputted from the optical current transducer unit, converting it to a voltage signal, and outputting the voltage signal.
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Citations
10 Claims
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1. A light detecting apparatus for detecting a signal light component included in input light, said light detecting apparatus comprising:
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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, wherein the first and second photoelectric conversion element units are connected in series such that cathodes thereof or anode thereof are connected to each other, and a connection point between the first and second photoelectric conversion element units connected in series is floating. - View Dependent Claims (2, 3, 4)
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5. A light detecting apparatus for detecting a signal light component included in input light, said light detecting apparatus comprising:
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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, wherein the first and second photoelectric conversion element units are connected in series such that cathodes thereof or anode thereof are connected to each other, said light detecting apparatus further comprises a bias voltage applying device which is connected between the first and second photoelectric conversion element units connected in series and which can apply a bias voltage to each of the first and second photoelectric conversion element units, and said optical current transducer unit outputs each of the electric current outputted by the first photoelectric conversion element unit and the electric current outputted by the second photoelectric conversion element unit if the bias voltage is applied to each of the first and second photoelectric conversion element units by said bias voltage applying device. - View Dependent Claims (6, 7)
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8. A light detecting apparatus for detecting a signal light component included in input light, said light detecting apparatus comprising:
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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; 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; a third photoelectric conversion element unit for converting the input light to an electric current and outputting it; and a second current/voltage converting unit for amplifying the electric current outputted from said third photoelectric conversion element unit and converting it to a voltage signal, wherein an AC signal, which is an output of said first current/voltage converting unit, is standardized by a DC signal, which is an output of said second current/voltage converting unit. - View Dependent Claims (9, 10)
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Specification