Optical coherent chromatography deformation field noise reduction method

Abstract

The invention discloses an optical coherent chromatography deformation field noise reduction method. A fuzzy logic method is utilized based on phase contrast spectral domain optical coherent chromatography technology. Through extracting a characteristic parameter from a measurement result, fuzzy inference and determining are performed. Noise reduction is performed on a cross section contour of a sample and a deformation field in the sample so that more clear cross section contour and finer deformation field distribution are realized. The method comprises the steps of calculating an original amplitude Am(y,z) and an original phase difference deltaphim(y,z) of an interference spectrum; calculating characteristic parameters C1, C2, C3 and C4 according to the original amplitude Am(y,z) and the original phase difference deltaphim(y,z) of the interference spectrum; performing fuzzification processing on the characteristic parameters C1, C2, C3 and C4 for obtaining fuzzification characteristic parameters Cn1, Cn2, Cn3 and Cn4; determining the fuzzification characteristic parameters and outputting O1 and O2; calculating an output amplitude Ae(y,z) and an output phase difference deltaphie(y,z) after noise reduction; and performing demodulation according to the output amplitude Ae(y,z) and the output phase difference deltaphie(y,z) for obtaining the deformation field after noise reduction.

Description

technical field [0001] The invention relates to the field of optical technology, in particular to an optical coherence tomography deformation field noise reduction method. Background technique [0002] Optical coherence tomography (OCT) is a tomographic measurement technique that uses the principle of low-coherence light interference. It has the advantages of fast measurement speed and non-destructive testing, and can achieve accurate measurement of micron-level profiles inside materials. Spectrum-domain optical coherence tomography (SOCT), developed after combining the spectrometer structure, further improves the measurement speed and signal-to-noise ratio of the method. In recent years, a series of new functional OCT methods have been developed based on SOCT technology, such as polarization-sensitive SOCT for measuring the internal birefringence properties of materials, Doppler SOCT for measuring the internal flow velocity field of materials, and measuring the internal def...

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Problems solved by technology

All of these lead to a low signal-to-noise ratio of the measurement results, and human participation is often required to identify the cross-sectional profile of the measured sample under noise pollution and the change trend of the details of the internal deformation field

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