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Dynamic Distance Measurement Based on a Fast Frequency-Swept Interferometry.

Yuru Chen1, Xiaohua Lei1, Lin Xiao1

  • 1The Key Lab of Optoelectronic Technology & Systems Ministry of Education, College of Optoelectronic Engineering, Chongqing University, Chongqing 400044, China.

Sensors (Basel, Switzerland)
|July 9, 2022
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Summary
This summary is machine-generated.

A new Doppler-induced error compensation model enhances dynamic distance measurement precision in frequency-swept interferometry (FSI) systems. This method achieves high accuracy for real-time distance tracking, improving FSI system performance.

Keywords:
Doppler-induced error compensationdynamic distance measurementfrequency-sweeping interferometry

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Area of Science:

  • Optical Metrology
  • Interferometry
  • Signal Processing

Background:

  • Dynamic distance measurement is crucial in various scientific and industrial applications.
  • Frequency-swept interferometry (FSI) systems offer potential for precise distance determination.
  • Doppler-induced errors can limit the accuracy of FSI systems in dynamic scenarios.

Purpose of the Study:

  • To enhance the precision of dynamic distance measurement using FSI.
  • To propose a novel Doppler-induced error compensation model.
  • To investigate a distance demodulation method suitable for dynamic FSI.

Main Methods:

  • A Doppler-induced error compensation model is developed by increasing the frequency sweeping rate.
  • Distance demodulation is performed using a Fourier transformation method.
  • The quasi-stationary coefficient is analyzed as it approaches a constant value.

Main Results:

  • Simulations and experiments were conducted using dynamic distance with sinusoidal changes.
  • The proposed compensation model significantly reduced Doppler-induced errors.
  • A standard deviation of 0.09 μm was achieved within a 4 μm distance range at a 60 KHz sweeping rate.

Conclusions:

  • The proposed Doppler-induced error compensation model effectively improves FSI precision for dynamic distance measurement.
  • The Fourier transformation-based demodulation method is suitable for dynamic FSI applications.
  • The method demonstrates high accuracy and reliability in real-world experimental validation.