技术领域technical field
本发明属于光学相干层析成像技术领域，具体涉及一种光学层析成像扫描装置。The invention belongs to the technical field of optical coherence tomography, and in particular relates to an optical tomography scanning device.
背景技术Background technique
光学相干层析成像技术基于低相干光干涉原理获得深度方向的层析能力，通过扫描重构生物组织或材料内部结构，其信号对比度源于生物组织或材料内部光学反射（散射）特性的空间变化，光学扫描装置对于成像结果十分重要，扫描光路的像差直接影响成像分辨率。Optical coherence tomography technology is based on the principle of low-coherence light interference to obtain tomographic capabilities in the depth direction, and reconstruct the internal structure of biological tissues or materials through scanning. The signal contrast is derived from the spatial variation of optical reflection (scattering) characteristics of biological tissues or materials. , the optical scanning device is very important to the imaging result, and the aberration of the scanning optical path directly affects the imaging resolution.
现有的扫描装置，利用互相正交的旋转电机实现两个方向的扫描，再通过聚焦透镜对光束聚焦，实现对被扫描物体的扫描。对于光学相干层析成像领域中的宽带光源，聚焦透镜的像差影响了系统分辨率。Existing scanning devices use mutually orthogonal rotating motors to scan in two directions, and then focus the light beam through a focusing lens to scan the object to be scanned. For broadband light sources in the field of optical coherence tomography, the aberrations of the focusing lens affect the system resolution.
发明内容Contents of the invention
鉴于现有的成像扫描装置存在的上述问题，本发明旨在提供一种结构紧凑，工作可靠的光学层析成像扫描装置。In view of the above-mentioned problems existing in the existing imaging scanning device, the present invention aims to provide a compact and reliable optical tomography scanning device.
本发明解决其技术问题所采用的技术方案是：一种光学层析成像扫描装置，包括安装外壳，安装于所述安装外壳上的光纤接头、固定抛物面聚焦镜、Y方向旋转抛物面聚焦镜、Y方向振动轴和磁控线圈；所述光纤接头输出的发散光经过所述固定抛物面聚焦镜会聚成平行光束，所述固定抛物面聚焦镜与所述Y方向旋转抛物面聚焦镜的光轴保持在同一直线上；所述Y方向振动轴通过Y方向磁控线圈带动Y方向旋转抛物面聚焦镜在被扫描物体上聚焦成光斑，并实现一个方向扫描。The technical solution adopted by the present invention to solve the technical problem is: an optical tomography scanning device, including a mounting shell, an optical fiber connector installed on the mounting shell, a fixed parabolic focusing mirror, a Y-direction rotating parabolic focusing mirror, a Y direction vibration axis and magnetron coil; the divergent light output by the optical fiber joint is converged into a parallel beam through the fixed parabolic focusing mirror, and the optical axes of the fixed parabolic focusing mirror and the Y-direction rotating parabolic focusing mirror are kept on the same line Above; the Y-direction vibration axis drives the Y-direction rotating parabolic focusing mirror through the Y-direction magnetron coil to focus on the object to be scanned into a spot and realize scanning in one direction.
进一步的，光学层析成像扫描装置还包括安装在安装外壳上的X方向平面反射镜、X方向振动轴和X方向磁控线圈；所述Y方向旋转抛物面聚焦镜聚焦的会聚光束再经过所述X方向平面反射镜，所述X方向磁控线圈驱动X方向振动轴带动所述X方向平面反射镜在被扫描物体上另一个方向扫描。Further, the optical tomography scanning device also includes an X-direction plane mirror, an X-direction vibration axis, and an X-direction magnetron coil installed on the installation shell; the converging light beam focused by the Y-direction rotating parabolic focusing mirror passes through the X-direction plane mirror, the X-direction magnetron coil drives the X-direction vibration axis to drive the X-direction plane mirror to scan in another direction on the object to be scanned.
进一步的，所述Y方向振动轴与所述述Y方向磁控线圈设有间隙；所述X方向振动轴与所述X方向磁控线圈设有间隙。Further, there is a gap between the Y-direction vibration axis and the Y-direction magnetron coil; and there is a gap between the X-direction vibration axis and the X-direction magnetron coil.
进一步的，所述Y方向振动轴设置于所述Y方向磁控线圈的扭矩平衡中间位置；所述X方向振动轴设置于所述X方向磁控线圈的扭矩平衡的中间位置。Further, the Y-direction vibration axis is set at the middle position of torque balance of the Y-direction magnetron coil; the X-direction vibration axis is set at the middle position of the torque balance of the X-direction magnetron coil.
进一步的，所述Y方向振动轴和X方向振动轴为正交。Further, the vibration axis in the Y direction and the vibration axis in the X direction are orthogonal.
进一步的，所述X方向振动轴和所述Y方向振动轴的轴截面为非对称。Further, the axis sections of the vibration axis in the X direction and the vibration axis in the Y direction are asymmetric.
进一步的，所述磁控线圈包括磁芯、磁控线圈和可控电流源；所述磁芯的四个磁极均绕两个磁控线圈，所述磁控线圈分为两组由各自的可控电流源驱动，所述磁控线圈的外部连接所述可控电流源。Further, the magnetic control coil includes a magnetic core, a magnetic control coil and a controllable current source; the four magnetic poles of the magnetic core are wound around two magnetic control coils, and the magnetic control coils are divided into two groups by their respective controllable current sources. Driven by a controlled current source, the outside of the magnetic control coil is connected to the controllable current source.
进一步的，所述磁控线圈包括两组第一磁控线圈和第二磁控线圈；所述可控电流源包括驱动所述第一磁控线圈的第一可控电流源和驱动所述第二磁控线圈的第二可控电流源。Further, the magnetron coils include two groups of first magnetron coils and second magnetron coils; the controllable current source includes a first controllable current source for driving the first magnetron coils and a first controllable current source for driving the first magnetron coils. The second controllable current source of the two magnetron coils.
与现有技术相比，本发明的有益效果是：本装置安装固定于单一的安装外壳中，使装置结构紧凑，工作可靠，利用固定抛物面聚焦镜将光纤输出的发散光会聚为平行光束，由于光纤输出端不采用球面或非球面透镜结构的光纤准直镜，光束聚焦也不采用透镜方式，避免了透镜引起的像差。Compared with the prior art, the beneficial effect of the present invention is: the device is installed and fixed in a single installation shell, which makes the device compact in structure and reliable in operation. The optical fiber output end does not use a fiber collimator with a spherical or aspheric lens structure, and the beam focusing does not use a lens method, which avoids aberrations caused by the lens.
附图说明Description of drawings
图1所示为本发明用于一维扫描的装置示意图；Fig. 1 is a schematic diagram of a device for one-dimensional scanning according to the present invention;
图2所示为本发明用于二维扫描的装置示意图；Fig. 2 is a schematic diagram of a device for two-dimensional scanning according to the present invention;
图3a所示为本发明第一可控电流源输出电流而第二可控电流源输出为零时的示意图；Fig. 3a is a schematic diagram showing the output current of the first controllable current source of the present invention and the output of the second controllable current source is zero;
图3b所示为本发明第二可控电流源输出电流而第一可控电流源输出为零时的示意图；Fig. 3b is a schematic diagram showing the second controllable current source output current of the present invention and the output current of the first controllable current source is zero;
图3c所示为本发明的固定第一可控电流源输出电流，通过改变第二可控电流源的大小，驱动振动轴顺时针旋转的示意图；Fig. 3c is a schematic diagram of fixing the output current of the first controllable current source of the present invention and driving the vibration axis to rotate clockwise by changing the size of the second controllable current source;
图4为现有的扫描装置结构示意图；FIG. 4 is a schematic structural diagram of an existing scanning device;
附图中：1. 光纤接头、2. 固定抛物面聚焦镜、3. 安装外壳、4. Y方向旋转抛物面聚焦镜、5. Y方向振动轴、6. Y方向磁控线圈、7. 被扫描物体、8. X方向平面反射镜、9. X方向振动轴、10. X方向磁控线圈；21.磁芯、22.第一磁控线圈、23.第二磁控线圈、24.第一可控电流源、25.第二可控电流源。In the attached drawings: 1. Optical fiber connector, 2. Fixed parabolic focusing mirror, 3. Installation shell, 4. Y-direction rotating parabolic focusing mirror, 5. Y-direction vibration axis, 6. Y-direction magnetron coil, 7. Object to be scanned , 8. X-direction flat mirror, 9. X-direction vibration axis, 10. X-direction magnetron coil; 21. Magnetic core, 22. First magnetron coil, 23. Second magnetron coil, 24. The first can Controlled current source, 25. A second controllable current source.
具体实施方式Detailed ways
以下结合具体实施例对本发明作进一步详细说明。应当理解，此处所描述的具体实施例仅仅用以解释本发明，并不用于限定本发明。The present invention will be described in further detail below in conjunction with specific examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
本发明提供一种光学层析成像扫描装置，用于解决现有的扫描装置的问题，如图4所示现有技术利用互相正交的旋转电机11和旋转电机12实现两个方向的扫描，再通过聚焦透镜13对光束聚焦，实现对被扫描物体14的扫描。对于光学相干层析成像领域中的宽带光源，聚焦透镜的像差影响了系统分辨率。The present invention provides an optical tomography scanning device, which is used to solve the problems of the existing scanning device. As shown in FIG. The light beam is then focused by the focusing lens 13 to realize scanning of the scanned object 14 . For broadband light sources in the field of optical coherence tomography, the aberrations of the focusing lens affect the system resolution.
如图1-3所示，本发明的光学层析成像扫描装置，包括安装外壳3，安装于所述安装外壳3上的光纤接头1、固定抛物面聚焦镜2、Y方向旋转抛物面聚焦镜4、Y方向振动轴5和Y方向磁控线圈；所述光纤接头1输出的发散光经过所述固定抛物面聚焦镜2会聚成平行光束，所述固定抛物面聚焦镜2与所述Y方向旋转抛物面聚焦镜4的光轴保持在同一直线上；所述Y方向磁控线圈6驱动Y方向振动轴5，进而通过带动Y方向旋转抛物面聚焦镜4在被扫描物体7上聚焦成光斑,实现一个方向的一维往复扫描，本装置安装固定于单一的安装外壳3中，使装置结构紧凑，工作可靠，利用固定抛物面聚焦镜2将光纤输出的发散光会聚为平行光束，由于光纤输出端不采用球面或非球面透镜结构的光纤准直镜，避免光纤准直镜引起的像差，利用Y方向旋转振动抛物面聚焦镜4对平行光束进行聚焦，不使用透镜聚焦，克服透镜引起的像差。As shown in Figures 1-3, the optical tomography scanning device of the present invention includes an installation housing 3, an optical fiber connector 1 installed on the installation housing 3, a fixed parabolic focusing mirror 2, a Y-direction rotating parabolic focusing mirror 4, The vibration axis 5 in the Y direction and the magnetron coil in the Y direction; the divergent light output by the optical fiber joint 1 is converged into a parallel beam through the fixed parabolic focusing mirror 2, and the fixed parabolic focusing mirror 2 and the rotating parabolic focusing mirror in the Y direction The optical axis of 4 is kept on the same straight line; the Y-direction magnetron 6 drives the Y-direction vibration axis 5, and then drives the Y-direction rotating parabolic focusing mirror 4 to focus on the scanned object 7 to form a light spot, realizing a one-direction one Two-dimensional reciprocating scanning, the device is installed and fixed in a single installation shell 3, so that the device has a compact structure and reliable operation. The divergent light output by the optical fiber is converged into a parallel beam by using a fixed parabolic focusing mirror 2. Since the output end of the optical fiber does not use spherical or non-linear The optical fiber collimator with spherical lens structure avoids the aberration caused by the optical fiber collimator, and uses the Y-direction rotating vibration parabolic focusing mirror 4 to focus the parallel beam without using lens focusing to overcome the aberration caused by the lens.
光学层析成像扫描装置还包括安装在安装外壳3上的X方向平面反射镜8、X方向振动轴9和X方向磁控线圈10；所述Y方向旋转抛物面聚焦镜4会聚成平行光束再经过所述X方向平面反射镜8，所述X方向磁控线圈10驱动X方向振动轴9带动所述X方向平面反射镜8在被扫描物体7上，实现另一个方向扫描。装置工作时X、Y方向振动轴在小角度内高速往复旋转，进而使聚焦光斑在被扫描物体表面进行二维扫描，经旋Y方向转抛物面聚焦镜4形成的会聚光束再经过X方向平面反射镜8实现绕X方向的扫描，且两个扫描方向相互正交，实现两个方向被扫描物体7的二维扫描，如果只需要进行一个方向的扫描，则X方向平面反射镜及X方向振动轴9和X方向磁控线圈可省略；同时由于光束自光纤输出后所经过的所有光学元件均为反射面，可以避免透镜像差。The optical tomography scanning device also includes an X-direction plane mirror 8, an X-direction vibration axis 9, and an X-direction magnetron coil 10 installed on the installation housing 3; the Y-direction rotating parabolic focusing mirror 4 converges into a parallel beam and then passes through The X-direction plane reflector 8, the X-direction magnetron 10 drives the X-direction vibration axis 9 to drive the X-direction plane reflector 8 on the scanned object 7 to realize scanning in another direction. When the device is working, the vibration axis in the X and Y directions reciprocates at a high speed within a small angle, so that the focused light spot performs two-dimensional scanning on the surface of the scanned object, and the converging beam formed by rotating the parabolic focusing mirror 4 in the Y direction is then reflected by the plane in the X direction. The mirror 8 realizes scanning around the X direction, and the two scanning directions are mutually orthogonal to realize two-dimensional scanning of the object 7 to be scanned in two directions. If only scanning in one direction is required, the X direction plane mirror and the X direction vibrate Axis 9 and X-direction magnetron coils can be omitted; at the same time, since all optical elements that the light beam passes through after outputting from the optical fiber are reflective surfaces, lens aberration can be avoided.
所述Y方向振动轴5设置于所述Y方向磁控线圈6的扭矩平衡中间位置；所述X方向振动轴9设置于所述X方向磁控线圈10的扭矩平衡的中间位置。The Y-direction vibration axis 5 is set at the middle position of the torque balance of the Y-direction magnetron coil 6 ; the X-direction vibration axis 9 is set at the middle position of the torque balance of the X-direction magnetron coil 10 .
所述Y方向振动轴5与所述述Y方向磁控线圈6设有间隙；所述X方向振动轴9与所述X方向磁控线圈10设有间隙且Y方向振动轴5以及所述X方向振动轴9不安装磁控线圈，以减小其转动惯量。The Y direction vibration axis 5 and the Y direction magnetron coil 6 are provided with a gap; the X direction vibration axis 9 and the X direction magnetron coil 10 are provided with a gap and the Y direction vibration axis 5 and the X direction Directional vibration axis 9 is not equipped with magnetron coil, to reduce its moment of inertia.
所述Y方向振动轴5和X方向振动轴9为正交；所述X方向振动轴和所述Y方向振动轴的轴截面为非对称，由于轴的截面不对称，外部磁路改变时，轴会产生一定的转动扭矩，轴在平衡位置附近小角度往复振动时，保证偏转角度与工作电流保持近似的线性关系。The vibration axis 5 in the Y direction and the vibration axis 9 in the X direction are orthogonal; the axial sections of the vibration axis in the X direction and the vibration axis in the Y direction are asymmetrical. Due to the asymmetrical cross section of the shaft, when the external magnetic circuit changes, The shaft will generate a certain rotational torque. When the shaft vibrates back and forth at a small angle near the equilibrium position, it is guaranteed that the deflection angle and the working current maintain an approximate linear relationship.
所述磁控线圈包括磁芯21、磁控线圈和可控电流源；所述磁芯21的四个磁极均绕两个磁控线圈，所述磁控线圈的外部连接所述可控电流源；所述磁控线圈包括两组第一磁控线圈22和第二磁控线圈23；所述可控电流源包括驱动所述第一磁控线圈22的第一可控电流源24和驱动所述第二磁控线圈23的第二可控电流源25。在使用时，驱动第一磁控线圈22的第一可控电流源24输出恒定的电流，通过改变第二可控电流源25输出的电流大小和方向带动Y方向振动轴5以及所述X方向振动轴9在小角度范围内高速振动，根据负载转动惯量的大小合理选择电流源输出电流的大小，由于每组线圈均由独立的第一可控电流源24、第二可控电流源25驱动即可满足振动频率要求，也可控制磁控线圈的发热量。The magnetic control coil includes a magnetic core 21, a magnetic control coil and a controllable current source; the four magnetic poles of the magnetic core 21 are all wound around two magnetic control coils, and the controllable current source is connected to the outside of the magnetic control coil The magnetron coils include two groups of the first magnetron coils 22 and the second magnetron coils 23; the controllable current source includes the first controllable current source 24 for driving the first magnetron coil 22 and driving The second controllable current source 25 of the second magnetron coil 23 is described above. When in use, the first controllable current source 24 that drives the first magnetically controlled coil 22 outputs a constant current, and drives the vibration axis 5 in the Y direction and the vibration axis 5 in the X direction by changing the magnitude and direction of the current output by the second controllable current source 25. The vibration shaft 9 vibrates at high speed in a small angle range, and the size of the output current of the current source is reasonably selected according to the size of the moment of inertia of the load, because each group of coils is driven by an independent first controllable current source 24 and a second controllable current source 25 It can meet the requirements of vibration frequency, and can also control the heat generation of the magnetic control coil.
参照图3a、3b、3c当第一可控电流源24输出如图3a箭头所示方向电流而第二可控电流源25输出为零时，磁芯21的四个磁极即A、B、C和D产生的磁力线方向如图3a所示，磁力线通过轴耦合，Y方向振动轴5或X方向振动轴9处于扭矩平衡的中间位置。当第二可控电流源25输出如图3b所示方向电流而第一可控电流源24输出为零时，磁芯21的四个磁极即A、B、C和D产生的磁力线方向如图3b所示，磁力线通过轴耦合，Y方向振动轴5或X方向振动轴9处于扭矩平衡的中间位置。其中图3a、3b中A、D磁极磁力线方向相同，B、C磁极磁力线方向相反。如果保持第一可控电流源24输出电流的大小和方向为图3a所示的恒定值，同时第二可控电流源25输出图3b所示方向的电流，则A、D磁极磁感应强度加强而B、C磁极磁感应强度减弱，Y方向振动轴5以及X方向振动轴9顺时针方向转动一定角度至新的平衡位置，如图3c所示。通过计算可知，偏转角度较小时，角度与线圈电流近似保持线性关系；改变图3c中第二可控电流源25的电流方向，Y方向振动轴5以及X方向振动轴9会逆时针方向转动。Referring to Fig. 3a, 3b, 3c, when the first controllable current source 24 outputs the direction current shown in Fig. 3a arrow and the second controllable current source 25 output is zero, the four magnetic poles of magnetic core 21 are A, B, C The direction of the magnetic force lines generated by D and D is shown in Figure 3a, the magnetic force lines are coupled through the shaft, and the vibration axis 5 in the Y direction or the vibration axis 9 in the X direction is in the middle of the torque balance. When the second controllable current source 25 outputs the current in the direction shown in Figure 3b and the first controllable current source 24 outputs zero, the directions of the magnetic force lines generated by the four magnetic poles of the magnetic core 21, namely A, B, C and D are shown in the figure As shown in 3b, the lines of magnetic force are coupled through the axes, and the vibration axis 5 in the Y direction or the vibration axis 9 in the X direction is in the middle position of the torque balance. Among them, in Fig. 3a and 3b, the directions of the magnetic force lines of the A and D magnetic poles are the same, and the directions of the magnetic force lines of the B and C magnetic poles are opposite. If the magnitude and direction of the output current of the first controllable current source 24 are maintained as the constant value shown in Figure 3a, and the second controllable current source 25 outputs the current in the direction shown in Figure 3b, then the magnetic induction intensity of the A and D magnetic poles is strengthened and The magnetic induction intensity of the B and C magnetic poles is weakened, and the vibration axis 5 in the Y direction and the vibration axis 9 in the X direction rotate a certain angle clockwise to a new equilibrium position, as shown in FIG. 3c. It can be known by calculation that when the deflection angle is small, the angle and the coil current approximately maintain a linear relationship; changing the current direction of the second controllable current source 25 in Fig. 3c, the vibration axis 5 in the Y direction and the vibration axis 9 in the X direction will rotate counterclockwise.
以上所述仅是本发明的优选实施方式，应当指出的是，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, these improvements and Retouching should also be regarded as the protection scope of the present invention.
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| CN2019101625440 | 2019-03-05 | ||
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| CN110095863Atrue CN110095863A (en) | 2019-08-06 |
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| CN201910479347.1APendingCN110095863A (en) | 2019-03-05 | 2019-06-04 | A kind of optical tomography scanning means |
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| US20080192316A1 (en)* | 2004-12-30 | 2008-08-14 | Warner Raymond M | Parallel-Beam Scanning for Surface Patterning of Materials |
| US20070007828A1 (en)* | 2005-06-24 | 2007-01-11 | Hitachi Via Mechanics, Ltd. | Scanner |
| US20080277567A1 (en)* | 2007-04-19 | 2008-11-13 | Simon John Doran | Fast laser scanning optical CT apparatus |
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| CN204116712U (en)* | 2014-10-21 | 2015-01-21 | 公安部第三研究所 | Short range passive terahertz imaging rapid scanning structure and imaging system |
| CN204405187U (en)* | 2014-12-24 | 2015-06-17 | 深圳先进技术研究院 | A kind of Fourier transform spectrometer, scanned imagery device |
| CN104523239A (en)* | 2015-01-12 | 2015-04-22 | 南京理工大学 | Full-depth spectral domain optical coherent tomography device and method |
| CN205003079U (en)* | 2015-10-13 | 2016-01-27 | 成都曙光光纤网络有限责任公司 | A terahertz wave transmission imaging system |
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| CN107126196A (en)* | 2017-05-18 | 2017-09-05 | 武汉理工大学 | Peeped in a kind of human body and monitor OCT medical systems and its preparation method of joint probe with real-time temperature and pressure |
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| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication | Application publication date:20190806 |