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Implementation of a Reference Interferometer for Nanodetection
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Note: A small roll angle measurement method with enhanced resolution based on a heterodyne interferometer.

S Tang1, Z Wang2, M Li1

  • 1Laboratory of X-ray Optics and Technology, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.

The Review of Scientific Instruments
|October 3, 2015
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Summary

Measuring small roll angles is challenging for standard interferometers. This study presents a novel heterodyne interferometer method using accessories to enhance sensitivity and improve measurement resolution for precise angular detection.

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Area of Science:

  • Optics
  • Metrology
  • Instrumentation

Background:

  • Commercial interferometer instruments exhibit low axial sensitivity, making direct measurement of small roll angles difficult.
  • Accurate measurement of small angular deviations is crucial in various precision engineering applications.

Purpose of the Study:

  • To present a novel method for measuring small roll angles using a heterodyne interferometer.
  • To enhance the sensitivity and resolution of roll angle measurements.

Main Methods:

  • A heterodyne interferometer setup was employed, incorporating a half-wave plate and a multiple-reflector.
  • Phase differences between the measurement and reference arms were detected using a phase meter.
  • A mathematical model was developed to analyze the relationship between pass times and resolution.

Main Results:

  • The proposed method demonstrated improved resolution by increasing the number of passes through the half-wave plate.
  • Theoretical resolution reached 0.19 arcseconds with three passes and a phase meter resolution of 0.01°.
  • Experimental validation confirmed the effectiveness of the developed measurement technique.

Conclusions:

  • The heterodyne interferometer method offers a viable solution for accurately measuring small roll angles.
  • Increasing pass times through the half-wave plate significantly enhances measurement resolution.
  • This technique provides a practical approach for high-precision angular metrology.