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Implementation of a Reference Interferometer for Nanodetection
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Optical-fiber frequency domain interferometer with nanometer resolution and centimeter measuring range.

Jidong Weng1, Tianjiong Tao, Shenggang Liu

  • 1Laboratory for Shock Waves and Detonation Physics Research, Institute of Fluid Physics, P. O. Box 919-102, Mianyang, Sichuan 621900, China.

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Summary

A novel optical-fiber frequency domain interferometer (OFDI) offers centimeter-range, nanometer-resolution absolute distance measurements. This compact, fiber-based device utilizes commercial components for accurate on-line metrology.

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Area of Science:

  • Optical Metrology
  • Fiber Optic Sensing
  • Precision Measurement

Background:

  • Accurate absolute distance measurement is crucial in various scientific and industrial applications.
  • Existing interferometry techniques can be complex, bulky, or limited in range and resolution.
  • Development of compact and high-resolution optical measurement devices is an ongoing need.

Purpose of the Study:

  • To develop a new optical-fiber frequency domain interferometer (OFDI) for precise absolute distance measurement.
  • To demonstrate centimeter measuring range with nanometer resolution using a compact, fiber-based system.
  • To validate the performance of the developed OFDI through on-line measurements.

Main Methods:

  • Design and construction of an OFDI device using commercial fiber optic communication components.
  • Utilization of amplified spontaneous emission (ASE) light as the broadband light source.
  • Employment of an optical-fiber tip as the measurement probe for compact and convenient operation.
  • Development of an on-line data processing method for real-time measurements.

Main Results:

  • Successful development of a compact and portable OFDI instrument.
  • Demonstration of nanometer resolution and centimeter measuring range for absolute distance.
  • Validation of the device's accuracy by measuring the length of a translation stage and thickness of gauge blocks.
  • The fiber-coupled design ensures ease of operation and portability.

Conclusions:

  • The developed OFDI is a viable solution for accurate, high-resolution absolute distance measurements.
  • The use of commercial fiber optic components enables a cost-effective and compact instrument.
  • This technology holds potential for applications requiring precise on-line metrology in confined spaces or remote locations.