CN216718217U

CN216718217U - OCT three-dimensional imaging device

Info

Publication number: CN216718217U
Application number: CN202122074736.1U
Authority: CN
Inventors: 王康俊; 吴晋龙
Original assignee: Aunion Tech Co ltd
Current assignee: Aunion Tech Co ltd
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2022-06-10
Anticipated expiration: 2031-08-31

Abstract

The utility model discloses an OCT three-dimensional imaging device, which comprises a wide-spectrum light source, a sample arm, a reference arm, a reflector, a beam splitter, a spectrum camera and a processing device, wherein the beam splitter is arranged between the wide-spectrum light source and a sample; the two sides of the beam splitter are respectively provided with a reference arm and an auxiliary arm, wherein a spectrum camera is arranged at the position, corresponding to the beam splitter, of the end part of the auxiliary arm; the spectrum camera is connected with a processing device; the wide spectrum light source comprises one of an LED, an SLD and a super-continuum spectrum light source; the filter of the spectral camera is a mosaic filter. The utility model directly collects the image and the spectrum data, has simple processing method and high imaging speed, and can quickly obtain the image; the structure is simple, the transportability is good, and the device can be used for THz waves, millimeter waves and even microwave bands; compared with a spectrometer mode used in the common spectral domain OCT, the method can acquire the transverse spectral interference information without space scanning; the integration level is high, the structure is compact, and the weight is light; reliable operation and high stability.

Description

OCT three-dimensional imaging device

Technical Field

The utility model relates to an OCT imaging device, in particular to an OCT three-dimensional imaging device.

Background

An Optical Coherence Tomography (OCT) is an imaging technique developed rapidly in the last ten years, and is based on the basic principle of a weak coherent Optical interferometer to detect back-reflected or several scattered signals of incident weak coherent light at different depth levels of a sample, and scan the signals to obtain a two-dimensional or three-dimensional structural image. The system is characterized in that core components of the system are a broadband light source and a Michelson interferometer, in the signal acquisition process, one part of reference light is directly reflected to enter a detector, the other part of light is used as detection light to enter a sample, emitted light or scattered light of different depths of the sample is interfered with the reference light, and the depth information of the sample can be obtained by detecting interference signals.

At present, for single-point scanning, the imaging speed of SD-OCT (spectral domain OCT) is superior to that of TD-OCT (time domain OCT) because there is no moving mechanical reference arm, and both the above two imaging modes need to be assisted by a scanning galvanometer in the one-dimensional and especially two-dimensional spatial scanning process, but the speed of the scanning galvanometer is generally limited to about 60kHz, which greatly limits the imaging speed of optical coherence tomography, especially three-dimensional structure imaging, and has the disadvantages of low integration level, poor stability, and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provides an OCT three-dimensional imaging device.

In order to solve the technical problems, the utility model provides the following technical scheme:

the utility model relates to an OCT three-dimensional imaging device, which comprises a wide-spectrum light source, a sample arm, a reference arm, a reflector, a beam splitter, a spectrum camera and a processing device,

the beam splitter is arranged between the wide-spectrum light source and the sample;

the reference arm and the auxiliary arm are respectively arranged at two sides of the beam splitter, wherein,

a spectrum camera is arranged at the position, corresponding to the beam splitter, of the end part of the auxiliary arm;

the spectrum camera is connected with a processing device.

As a preferred embodiment of the present invention, the wide spectrum light source includes one of an LED, an SLD, and a super-continuum spectrum light source.

As a preferable technical solution of the present invention, a mirror is provided at an end of the reference arm.

As a preferred embodiment of the present invention, a sample arm is disposed between the beam splitter and the sample.

As a preferred technical solution of the present invention, the optical filter of the spectral camera is a mosaic filter.

The utility model has the following beneficial effects: the utility model directly collects the image and the spectrum data, has simple processing method and high imaging speed, and can quickly obtain the three-dimensional image; the structure is simple, the transportability is good, and the device can be used for THz waves, millimeter waves and even microwave bands; compared with a spectrometer mode used in the common spectral domain OCT, the method can acquire the transverse spectral interference information without space scanning; the integration level is high, the structure is compact, and the weight is light; reliable operation and high stability.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model and not to limit the utility model. In the drawings:

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic of the present invention;

in the figure: 1. a broad spectrum light source; 2. a sample arm; 3. a reference arm; 4. a reflective mirror; 5. a beam splitter; 6. a spectral camera; 7. A processing device; 8. an auxiliary arm.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

Examples

As shown in fig. 1, the present invention provides an OCT three-dimensional imaging device, which includes a wide-spectrum light source 1, a sample arm 2, a reference arm 3, a reflective mirror 4, a beam splitter 5, a spectrum camera 6, and a processing device 7, wherein the beam splitter 5 is disposed between the wide-spectrum light source 1 and a sample. Reference arms 3 and auxiliary arms 8 are respectively arranged on two side sides of the beam splitter 5, wherein a spectrum camera 6 is arranged at the position, corresponding to the beam splitter 5, of the end portion of the auxiliary arm 8, the spectrum camera 6 is connected with a processing device 7, direct collection of images and spectrum data is achieved, the processing method is simple, and the imaging speed is high.

In the embodiment, the wide-spectrum light source 1 includes one of an LED, an SLD and a supercontinuum light source, and other light sources may be selected, and when the SLD is used, interferometric measurement can obtain high resolution.

The end of the reference arm 3 is provided with a mirror 4. A sample arm 2 is arranged between the beam splitter 5 and the sample.

Specifically, the optical filter of the spectral camera 6 is a mosaic optical filter, as shown in fig. 2, the spectral resolution corresponds to Δ λ/(M × N), in this embodiment, Δ λ is the spectrum width of the light source, M, N is the number of filter rows and columns of the optical filter periodic micro-units, generally, M is N, and each optical filter micro-unit corresponds to a pixel of the image sensor, in this embodiment, one spatial position point actually imaged actually corresponds to one mosaic optical filter periodic micro-unit structure; compared with a spectrometer mode used in the common spectral domain OCT, the method does not need space scanning to obtain the transverse spectral interference information, and meanwhile, the light splitting principle of the optical filter array is relatively simple, so that the method has high integration level, compact structure and light weight; reliable work, high stability and the like; the spectral camera 6 is connected with the processing device 7 to directly acquire images and spectral data, the processing method is simple, the imaging speed is high, the three-dimensional images are quickly acquired by the connected processing device 7 (in the embodiment, a computer processing system is preferred) through the area-array camera and the corresponding algorithm, and the three-dimensional image acquisition system has the characteristics of compact structure, good portability and the like.

The utility model directly collects the image and the spectrum data, has simple processing method and high imaging speed, and can quickly obtain the three-dimensional image; the structure is simple, the transportability is good, and the device can be used for THz waves, millimeter waves and even microwave bands; compared with a spectrometer mode used in the common spectral domain OCT, the method can acquire the transverse spectral interference information without space scanning; the light splitting principle of the light filter array is relatively simple, so that the light filter array has high integration level, compact structure and light weight; reliable operation, high stability and the like.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the utility model. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An OCT three-dimensional imaging device is characterized by comprising a wide-spectrum light source (1), a sample arm (2), a reference arm (3), a reflecting mirror (4), a beam splitter (5), a spectrum camera (6) and a processing device (7),

the beam splitter (5) is arranged between the wide-spectrum light source (1) and the sample;

the two sides of the beam splitter (5) are respectively provided with a reference arm (3) and an auxiliary arm (8),

a spectrum camera (6) is arranged at the position, corresponding to the beam splitter (5), of the end part of the auxiliary arm (8);

the spectrum camera (6) is connected with a processing device (7).

2. The OCT three-dimensional imaging device according to claim 1, characterized in that the broad spectrum light source (1) comprises one of an LED, an SLD and a supercontinuum light source.

3. OCT three-dimensional imaging device according to claim 1, characterized in that the end of the reference arm (3) is provided with a mirror (4).

4. The OCT three-dimensional imaging device according to claim 1, characterized in that a sample arm (2) is arranged between the beam splitter (5) and the sample.

5. The OCT three-dimensional imaging device according to claim 1, characterized in that the filter of the spectral camera (6) is a mosaic filter.