AN OPTICAL DISPLACEMENT METER BASED ON A LIGHT-TO- FREQUENCY CONVERTER

• Abstract:

  This paper proposes a contactless displacement measurement system based on a temperature compensated light-to-frequency (L/F) converter. The optical displacement sensor is represented by the L/F converter excited by a LASER beam. To compensate the temperature drift error of the displacement sensor, an additional temperature measurement system based on a temperature transducer is required. The processing of the data delivered by the sensors is on-line performed using a neural algorithm implemented on a Digital Signal Processor. The Artificial Neural Network architecture used in the present application is Multiple Inputs – Single Output (MISO) type, and the output of the network represents the displacement value after an on-line temperature correction. In the calibration phase of the displacement measurement system a closed-loop motorised linear actuator controlled by a plug-in-PC motion board is added to the system.
• Keywords:

  displacement measurement, optical transducer, error compensation
• Download:

  IMEKO-WC-2000-TC2-P050.pdf
• DOI:

  _unreg_wc-2000.050

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