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An optical absolute position measurement method using a phase-encoded single track binary code.

Jong-Ahn Kim1, Jae Wan Kim, Chu-Shik Kang

  • 1Center for Length, Korea Research Institute of Standards and Science, 267 Gajeong-ro, Yuseong-gu, Daejeon 305-340, South Korea.

The Review of Scientific Instruments
|December 5, 2012
PubMed
Summary
This summary is machine-generated.

This study introduces a novel absolute position measurement technique using a single track binary code. The method achieves high resolution and low nonlinearity, simplifying complex measurement systems.

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Area of Science:

  • Metrology
  • Optical Engineering
  • Signal Processing

Background:

  • Accurate absolute position measurement is crucial in various scientific and industrial applications.
  • Existing methods often involve complex configurations or limited code flexibility.
  • A need exists for a simplified, efficient, and versatile absolute position encoding system.

Purpose of the Study:

  • To develop and validate a new absolute position measurement method utilizing a single track binary code.
  • To demonstrate the method's efficiency in decoding and sub-division capabilities.
  • To achieve high resolution and low nonlinearity in position measurements with a simple system configuration.

Main Methods:

  • Encoding absolute position by altering the phase of a binary state representation within a single track.
  • Efficient decoding leveraging the structural properties of the binary code.
  • Sub-division by detecting relative positions of binary state representations, independent of the absolute position encoding.
  • System implementation using a binary code scale, microscopic imaging, and a CCD camera.

Main Results:

  • The proposed method allows for efficient decoding and sub-division without interference.
  • Any pseudo-random sequence can be employed as the absolute position code.
  • The experimental setup achieved a resolution of less than 50 nm.
  • Nonlinearity error was measured to be less than ±60 nm after compensation.

Conclusions:

  • The developed absolute position measurement method offers a simple and efficient solution.
  • Its design eliminates the need for additional sensing parts for sub-division.
  • The system demonstrates high precision, comparable to laser interferometry, with a simplified configuration.