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Accuracy of active chirp linearization for broadband frequency modulated continuous wave ladar
Zeb W Barber1, Wm Randall Babbitt, Brant Kaylor
1Montana State University-Spectrum Lab, Bozeman, Montana 59717, USA. barber@spectrum.montana.edu
Applied Optics
|January 12, 2010
Summary
This study presents a broadband chirped ladar system with active chirp linearization, achieving high precision and accuracy. The findings indicate potential for measurement precision and accuracy approaching the part per billion level.
Area of Science:
- Optical Engineering
- Metrology
- Laser Technology
Background:
- Frequency Modulated Continuous Wave (FMCW) Chirp Ladar systems offer enhanced performance with increased bandwidth and linearity.
- Existing systems face limitations in precision and accuracy due to chirp nonlinearity and material dispersion.
Purpose of the Study:
- To analyze a very broadband (multi-THz) and highly linear (<1 ppm) chirped ladar system.
- To investigate the impact of residual chirp nonlinearity and material dispersion on system performance.
- To predict the achievable measurement precision and accuracy.
Main Methods:
- Development and analysis of an active chirp linearization technique for FMCW ladar.
- Modeling the effects of chirp nonlinearity and material dispersion on dynamic range, precision, and accuracy.
- System performance prediction based on theoretical analysis.
Main Results:
- Demonstration of a broadband chirped ladar system with exceptional linearity.
- Quantification of the influence of nonlinearity and dispersion on measurement outcomes.
- Prediction of measurement precision and accuracy at the part-per-billion level.
Conclusions:
- Active chirp linearization is crucial for advancing FMCW ladar capabilities.
- The analyzed system design enables unprecedented levels of measurement precision and accuracy.
- This technology has significant implications for high-precision metrology and sensing applications.
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