Whole-field optically coherent chromatographic imaging system with no-dispersion phase shifter
An optical coherence tomography and imaging system technology, applied in the field of full-field optical coherence tomography systems, can solve the problems of inability to change the polarization state correctly, the zero-order wave plate is expensive, and the wavelength range is limited, and achieves a strong phase shift algorithm. Adaptability, shortened measurement time, effect of shortened measurement time
Inactive Publication Date: 2007-01-03
ZHEJIANG UNIV
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However, since the design of the λ / 4 wave plate is for a specific wavelength, even if the zero-order wave plate is used, its applicable wavelength range is very limited, and the price of the zero-order wave plate is expensive
Therefore, for a broadband OCT system, the λ / 4 waveplates 5 and 6 cannot correctly change the polarization states of all spectral components, and thus cannot ensure that the light returning from the reference mirror 9 and the sample 10 passes through the PBS 4 to reach the area array CCD for detection efficiently Device 14
Moreover, the non-dispersive phase shifter composed of the λ / 2 wave plate 11 whose fast axis is 15° to the horizontal direction, the λ / 4 wave plate 12 whose fast axis is 75° to the horizontal direction, and the rotating polarizer 13 is placed on the detector In front of the area array CCD detector 14 in the arm, the light beam passes through the non-dispersive phase shifter once, and only the phase shift amount of 4 times the rotation angle of the polarizer can be obtained
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[0022] Below in conjunction with accompanying drawing and embodiment, the present invention will be further described:
[0023] like figure 2 As shown, a full-field optical coherence tomography system using a dispersion-free phase shifter described in the present invention includes: a light source 15, a collimating lens 16, a broadband beam splitting prism 17, a polarizer 18, and a dispersion-free phase shifter 19. Broadband polarizing beam splitter prism 20, a pair of identical microscope objective lenses 21 and 22, precision electronically controlled translation stage 23, piezoelectric ceramic driver 24, reference mirror 25, sample 26, imaging lens 27 and area CCD detector 28. The light source 15 may be a white light source, a super radiant diode, a light emitting diode or a laser light source.
[0024] image 3 It is a schematic diagram of the composition structure of the dispersion-free phase shifter 19 in the present invention. It consists of a λ / 4 wave plate 29 whose ...
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The present invention is one whole-field optically coherent chromatographic imaging system with no-dispersion phase shifter. The light from the light source after passing through a collimating lens, a wide-band beam splitting prism, a polaroid, a no-dispersion phase shifter and a wide-band polarizing beam splitting prism successively is divided into two light beams. One of the light beams reaches to the reference mirror through the first micro objective on one precise electrically controlled platform, while the other light beam reaches to the sample through the second micro objective on one piezoelectric ceramic driver. In the reflected light side of the reference mirror and the sample, there are imaging lens and CCD detector connected together. The present invention has the advantages of less devices, simple structure, and short measuring period.
Description
technical field [0001] The invention relates to an instrument for radiological diagnosis, in particular to a full-field optical coherence tomography system using a dispersion-free phase shifter. Background technique [0002] Optical Coherence Tomography (OCT) is a tomographic imaging technology developed in recent years, which can achieve non-contact, non-invasive, high-resolution imaging of tissue structure and physiological functions inside the living body. OCT technology has been widely used in the field of biomedicine and clinical diagnosis. It can be used in the early diagnosis of diseases such as ophthalmology and skin. It will also play an important role in materials science and basic research. [0003] Improving the imaging speed of OCT has always been the goal pursued by people. The full-field OCT acquires two-dimensional cross-sectional images based on parallel technology, and the imaging speed is significantly improved compared to the point-scan imaging method. ...
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Login to View More IPC IPC(8): A61B5/00A61B10/00G01N21/84G02B27/44
Inventor 丁志华杨亚良吴凌
Owner ZHEJIANG UNIV