We established a complete model and relationship between laser source characteristics and measurement accuracy of high precision fiber microprobe sensor(FMS)based on phase generated carrier *** laser carried out high-...
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We established a complete model and relationship between laser source characteristics and measurement accuracy of high precision fiber microprobe sensor(FMS)based on phase generated carrier *** laser carried out high-bandwidthfrequencymodulation to improve the measurement ***,the laser also carried out large-amplitudefrequencymodulation to eliminate tens of nanometers of nonlinear error,thus improving the measurement ***,the laser center wavelength is required to be stabilized under the above modulation to achieve a high measurement *** conflict between laser frequencymodulation and central stability is revealed and analyzed alongside the distortion of measurement accuracy.A modified frequency stabilization method for laser source under high-bandwidth and large-amplitudemodulation is proposed for improving measurement accuracy to realize sub-nanometer *** experimental results showed that when the modulationbandwidth was 1 MHz and maximum modulationamplitude was 2.61 GHz,the distributed feedback laser central wavelength stability was 2.9×10^(−10)(τ=1s)according to Allan ***,the relative expanded uncertainty of the laser wavelength was demonstrated to be superior to 5×10^(−8)(k=2)within 3 hr,which was at least one order of magnitude higher than that of the traditional *** resolution and stability of FMS is better than 0.4 nm,and the nonlinear error is reduced from tens of nm to 0.8 nm,which meets the requirements of sub-nanometer measurements.
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