Error Correction for FSI-Based System without Cooperative Target Using an Adaptive Filtering Method and a Phase-Matching Mosaic Algorithm

In our frequency scanning interferometry-based (FSI-based) absolute distance measurement system, a frequency sampling method is used to eliminate the influence of laser tuning nonlinearity. However, because the external cavity laser (ECL) has been used for five years, factors such as the mode hopping of the ECL and the low signal-to-noise ratio (SNR) in a non-cooperative target measurement bring new problems, including erroneous sampling points, phase jumps, and interfering signals. This article analyzes the impacts of the erroneous sampling points and interfering signals on the accuracy of measurement, and then proposes an adaptive filtering method to eliminate the influence. In addition, a phase-matching mosaic algorithm is used to eliminate the phase jump, and a segmentation mosaic algorithm is used to improve the data processing speed. The result of the simulation proves the efficiency of our method. In experiments, the measured target was located at eight different positions on a precise guide rail, and the incident angle was 12 degrees. The maximum deviation of the measured results between the FSI-based system and the He-Ne interferometer was 9.6 μm, and the maximum mean square error of our method was 2.4 μm, which approached the Cramer-Rao lower bound (CRLB) of 0.8 μm.

[1]  Bing Li,et al.  Precision improvement in frequency-scanning interferometry based on suppressing nonlinear optical frequency sweeping , 2015, Optical Review.

[2]  Dug Young Kim,et al.  Analysis of nonlinear frequency sweep in high-speed tunable laser sources using a self-homodyne measurement and Hilbert transformation. , 2007, Applied optics.

[3]  I. Coddington,et al.  Comb-calibrated laser ranging for three-dimensional surface profiling with micrometer-level precision at a distance. , 2014, Optics express.

[4]  Patrick Gill,et al.  High-accuracy length metrology using multiple-stage swept-frequency interferometry with laser diodes , 1998 .

[5]  Karl Meiners-Hagen,et al.  Spectroscopically in situ traceable heterodyne frequency-scanning interferometry for distances up to 50 m , 2015 .

[6]  Bingguo Liu,et al.  Absolute distance measurement system with micron-grade measurement uncertainty and 24 m range using frequency scanning interferometry with compensation of environmental vibration. , 2016, Optics express.

[7]  L. T. Wang,et al.  Loss measurement in optical waveguide devices by coherent frequency-modulated continuous-wave reflectometry. , 1993, Optics letters.

[8]  Muhammad Hussain.  Mammogram Enhancement Using Lifting Dyadic Wavelet Transform and Normalized Tsallis Entropy , 2014, Journal of Computer Science and Technology.

[9]  Marc Wuilpart,et al.  Analysis and suppression of nonlinear frequency modulation in an optical frequency-domain reflectometer. , 2009, Optics express.

[10]  L. Nenadovic,et al.  Rapid and precise absolute distance measurements at long range , 2009 .

[11]  Amnon Yariv,et al.  Phase-locking and coherent power combining of broadband linearly chirped optical waves. , 2012, Optics express.

[12]  B. Soller,et al.  Optical vector network analyzer for single-scan measurements of loss, group delay, and polarization mode dispersion. , 2005, Applied optics.

[13]  L. Howard,et al.  Absolute interferometry with a 670-nm external cavity diode laser. , 1999, Applied optics.

[14]  A. Reichold,et al.  Multi-channel absolute distance measurement system with sub ppm-accuracy and 20 m range using frequency scanning interferometry and gas absorption cells. , 2014, Optics express.

[15]  Z. Barber,et al.  Accuracy of active chirp linearization for broadband frequency modulated continuous wave ladar. , 2010, Applied optics.

[16]  Tae-Jung Ahn,et al.  Suppression of nonlinear frequency sweep in an optical frequency-domain reflectometer by use of Hilbert transformation. , 2005, Applied optics.

[17]  Robert X. Gao,et al.  Cloud-enabled prognosis for manufacturing , 2015 .

[18]  Dispersion compensation method based on focus definition evaluation functions for high-resolution laser frequency scanning interference measurement , 2017 .

[19]  Y. Salvade,et al.  Radio frequency controlled synthetic wavelength sweep for absolute distance measurement by optical interferometry. , 2008, Applied optics.

[20]  John J. Gart,et al.  An Extension of the Cramer-Rao Inequality , 1959 .

[21]  Frédérique Vanholsbeeck,et al.  Dispersion compensation in Fourier domain optical coherence tomography using the fractional Fourier transform. , 2012, Optics express.

[22]  Bin Liu,et al.  Experimental confirmation of potential swept source optical coherence tomography performance limitations. , 2008, Applied optics.

[23]  T. Kinder,et al.  Absolute distance interferometer with grating-stabilized tunable diode laser at 633 nm , 2002 .

[24]  Karl Meiners-Hagen,et al.  Diode-laser-based high-precision absolute distance interferometer of 20 m range. , 2009, Applied optics.