A High-Speed, High-Accuracy Optical Position Sensor Integrated with an Analog and Digital Signal-Processing Circuit

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  • Ohtani Kozo
    Dept. of Computer Science, Hiroshima Institute of Technology
  • Baba Mitsuru
    Dept. of Enginnering Technology, Ibaraki University

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  • アナログ・デジタル複合構成による高速高精度な光位置センサ
  • アナログ デジタル フクゴウ コウセイ ニ ヨル コウソク コウセイド ナ ヒカリ イチ センサ

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Abstract

This paper describes a high-speed and a high-accuracy optical position sensor that detects the positions of plural light spots illuminated by various types of light sources, such as light-emitted diode and laser diode. The applications using these systems usually require the measurement performance to be fast, of high accuracy and capable of simultaneously detecting plural points. Moreover, the applications should have some intelligence function, such as the adaptation of the detection procedure to the environment being measured. Here, we designed a new sensor system using an optical 2-D sensor array, an analog parallel scan circuit and a neural network implemented on a Field Programmable Gate Array (FPGA), which satisfied the abovementioned requirements. The experiment results with the prototype sensor system were as follows: (1) The relative error was at most 1.4%; (2) The sampling frequency was about 20kHz; and (3) The sensor system reduced the influence of background light on the position detection by the neural network.

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