Optical coherence tomography apparatus and optical coherence tomography method

A technology of optical coherence tomography and imaging equipment, which is applied in the direction of material analysis through optical means, the use of optical devices, scientific instruments, etc., and can solve problems such as no discussion

Inactive Publication Date: 2014-12-10
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, NPL 1 does not discuss how to obtain tomographic images with less noise or how to process interference signals based on multiple light sources, which the inventors are concerned with

Method used

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  • Optical coherence tomography apparatus and optical coherence tomography method
  • Optical coherence tomography apparatus and optical coherence tomography method
  • Optical coherence tomography apparatus and optical coherence tomography method

Examples

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no. 1 example

[0114] image 3 is a schematic diagram showing the optical coherence tomography apparatus according to the first embodiment. In the device according to the present embodiment, two wavenumber clock interferometers are provided to reduce the required wavelength detection accuracy.

[0115] light source unit

[0116]The light source unit emits light obtained by combining light emitted from two swept light sources 301 and 302 each emitting light having an oscillation wavelength that changes periodically using a fiber coupler 303 .

[0117] The frequency-swept light source 301 transmits a synchronization signal 333 to a PC 340 included in the processing unit. The synchronization signal 333 allows the A / D board to start acquiring data in synchronization with the periodic variation of the oscillation wavelength.

[0118] Each swept light source is a light source that emits light obtained by filtering light spatially extended by the diffraction grating by moving a slit-like mirror....

no. 2 example

[0156] Figure 4 is a schematic diagram showing an optical coherence tomography apparatus according to a second embodiment.

[0157] light source unit

[0158] The light source unit and the OCT interferometer according to the present embodiment have structures similar to those of the first embodiment. exist Figure 4 in, with image 3 Components similar to those shown in are denoted by the same reference numerals, and their explanations will be omitted to avoid redundancy.

[0159] OCT interferometer and generation of interferometric signals

[0160] Light obtained by combining the lights emitted from the two swept light sources 301 and 302 is emitted from the light source unit, and is split into two lights by the fiber coupler 403 . One of the two lights that have been separated from each other is guided to an OCT interferometer. Spectral interference signal 339 is obtained by an OCT interferometer and input to PC 340 .

[0161] Detection of time to output a predetermi...

no. 3 example

[0182] An optical coherence tomography apparatus according to a third embodiment includes a light source unit including three swept light sources. will refer to Figure 5 The optical coherence tomography apparatus is described.

[0183] light source unit

[0184] The light source unit emits light obtained by combining light emitted from three frequency-sweeping light sources 501, 502, and 503 each emitting light having an oscillation wavelength that changes periodically by using an optical combiner 504 .

[0185] Each swept light source is a light source that emits light obtained by filtering light spatially extended by the diffraction grating by moving a slit-like mirror.

[0186] The output spectral ranges of the three frequency-sweeping light sources 501, 502, and 503 are 800 to 835 nm, 825 to 860 nm, and 850 to 885 nm, respectively, and each of the frequency-sweeping light sources sweeps the wavelength from the short-wavelength side to the long-wavelength side within 3 ...

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Abstract

An optical coherence tomography apparatus includes a light source unit that emits light including lights emitted from swept sources, which have different center wavelengths and partially overlapping output spectral ranges, the lights having the respective output spectral ranges and being temporally separated from each other, a dividing unit that is connected to the light source unit and that divides the light emitted from the light source unit, a wavelength selecting unit that is connected to the dividing unit and that selects light having a predetermined wavelength from a range in which the output spectral ranges overlap, a time detecting unit that is connected to the wavelength selecting unit and that detects times at which the swept sources oscillate at the predetermined wavelength, and a wavenumber detecting unit that is connected to the dividing unit and that detects times at which the lights from the swept sources have the same wavenumber.

Description

technical field [0001] The present invention relates to an optical coherence tomography apparatus and an optical coherence tomography method using a plurality of light sources having different output wavelength ranges. Background technique [0002] Fourier-domain optical coherence tomography (FD-OCT) apparatuses are known, which acquire signals of tomographic information of a measurement object by Fourier transforming spectral interference signals. In the FD-OCT apparatus, light emitted from a light source is divided into two or more components, one of which is used as reference light, and the other is used as illuminating light for irradiating an analyte. [0003] Scattered or reflected light is returned from the analyte that has been irradiated by the illumination light, and a signal based on the spectral interference of the returned light and the reference light is acquired. The interference signal is plotted on the wavenumber space axis, and oscillates along the wavenum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/17
CPCG01N21/4795G01B9/02004G01B9/02084G01B9/02091
Inventor 太田健史
Owner CANON KK
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