OCT chromatography longitudinal scan device for measuring biological tissue

Abstract

The invention discloses an OCT chromatography longitudinal scanning device for biological tissue measurement, which comprises a longitudinal scanning device and a phase modulation device, wherein the longitudinal scanning device comprises a wedge mirror group consisting of two wedge mirrors and a precision electrical control translation table; the two wedge mirrors have the same structure; one wedge mirror is fixed on the fixed end of the precision electrical control translation table, the other wedge mirror is fixed on the movable end of the precision electrical control translation table, and oblique edges between the two wedge mirrors are placed in parallel; the phase modulation device is arranged between a reference arm lens and an optical fiber coupler and comprises two semi-cylindrical vitreous bodies, a piezoelectric ceramic micro positioner and a single mode optical fiber; and the two semi-cylindrical vitreous bodies are connected through the piezoelectric ceramic micro positioner to form a piezoelectric ceramic post, and the outside of the piezoelectric ceramic post is wound with optical fibers and is sealed by glue. The device has the characteristics of simple control, good stability, and so on; and the wedge mirror group is adopted and the phase modulation device is added to the reference arm so as to reduce the amount of movement and measurement errors and improve the accuracy of measurement.

Description

technical field [0001] The invention relates to an optical coherence tomography (OCT) scanning device, in particular to an OCT tomography longitudinal scanning device based on biological tissue measurement. Background technique [0002] Optical coherence tomography (OCT) is an emerging optical imaging technology, which can realize non-contact, non-destructive, high-resolution imaging of the internal tissue structure and physiological functions of the living body, and is used to detect various Favorable tool for biological tissue. [0003] Optical coherence tomography uses low-coherence light source or ultrashort laser pulse, combines optical coherence technology with laser scanning confocal technology, and utilizes the high-sensitivity heterodyne detection characteristics of the coherence instrument, and only the light returned at the focus of the detection beam The light has the strongest interference signal to be detected, and the light leaving the focal point will not be...

AI Technical Summary

Problems solved by technology

This kind of phase modulator has two disadvantages: one is that the radial expansion and contraction of piezoelectric ceramics is small, and the resulting optical path scanning range is small; the other is that the birefringence effect caused by the bending radius during the bending or expansion of the optical fiber will affect the interference graph contrast

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