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Interference sensor for ultra-precision measurement of laser beam angular deflection.

Marek Dobosz1

  • 1Faculty of Mechatronics, Institute of Metrology and Biomedical Engineering, Warsaw University of Technology, Sw. A. Boboli 8 Str., Warsaw 02-525, Poland.

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Summary

This study introduces a novel interference sensor for highly accurate laser beam angular deflection measurement. The sensor achieves 25 nrad resolution and sub-1% accuracy, enabling precise angular tilt determination.

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Area of Science:

  • Optical Metrology
  • Laser Beam Analysis
  • Interference Sensing Technology

Background:

  • Precise measurement of laser beam angular deflection is critical in various scientific and industrial applications.
  • Existing methods may lack the required resolution or accuracy for ultra-precise measurements.
  • The angular tilt of measurement devices relative to the beam axis also requires accurate quantification.

Purpose of the Study:

  • To propose and theoretically analyze a new interference sensor for ultra-precise measurement of laser beam angular deflection.
  • To investigate the sensor's capability to measure the angular tilt of the device itself.
  • To detail the algorithms, error sources, and metrological feasibility of the proposed sensor.

Main Methods:

  • Theoretical analysis based on fringe period and optical setup design.
  • Development of calculating algorithms for angle evaluation and fringe phase influence.
  • Statistical analysis of sensor positioning effects on measurement repeatability.
  • Exploration of the primary sources of measurement error.

Main Results:

  • The interference sensor demonstrates a resolution of 25 nrad.
  • Achieved accuracy is better than 1% within a 350 µrad measurement range.
  • The study details metrological feasibilities and potential applications.

Conclusions:

  • The novel interference sensor offers ultra-precise angular deflection and tilt measurement capabilities.
  • The theoretical framework and error analysis provide a robust foundation for practical implementation.
  • Potential applications span fields requiring high-accuracy optical measurements.