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Laser swept-frequency interferometry with non-uniform fast Fourier transform and a linear regression frequency
Applied Optics
|September 14, 2023
Summary
This study introduces a new laser ranging method to improve accuracy. The linear regression technique effectively corrects for nonlinearities in laser frequency sweeps, reducing ranging errors in high-precision measurements.
Area of Science:
- Optics and Photonics
- Metrology and Measurement Science
Background:
- Laser swept-frequency interferometry is vital for high-precision, large-scale, and non-cooperative measurements.
- Chirp nonlinearities in laser swept-frequency interferometry degrade ranging accuracy by broadening the target spectrum and complicating frequency extraction.
Purpose of the Study:
- To propose a novel method to mitigate the impact of frequency modulation nonlinearity on ranging accuracy.
- To enhance the precision of laser swept-frequency interferometric ranging.
Main Methods:
- A linear regression laser swept-frequency interferometry method was developed.
- The non-uniform fast Fourier transform was employed to process the beat signal.
Main Results:
- The proposed method effectively suppresses the influence of frequency modulation nonlinearity.
- Ranging accuracy is significantly improved by addressing chirp nonlinearities.
Conclusions:
- The linear regression method offers a robust solution for accurate laser swept-frequency interferometry.
- This technique is particularly beneficial for applications demanding high precision despite inherent laser nonlinearities.
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