CN210072202U - Optical tomography scanning device - Google Patents
Optical tomography scanning device Download PDFInfo
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- CN210072202U CN210072202U CN201920828641.4U CN201920828641U CN210072202U CN 210072202 U CN210072202 U CN 210072202U CN 201920828641 U CN201920828641 U CN 201920828641U CN 210072202 U CN210072202 U CN 210072202U
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- magnetic control
- vibration shaft
- focusing mirror
- control coil
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Abstract
The utility model discloses an optical tomography scanning device, which comprises an installation shell, an optical fiber connector, a fixed paraboloid focusing mirror, a Y-direction rotating paraboloid focusing mirror, a Y-direction vibration shaft and a Y-direction magnetic control coil, wherein the optical fiber connector, the fixed paraboloid focusing mirror, the Y-direction rotating paraboloid focusing mirror, the Y-direction vibration shaft and the Y-direction magnetic control coil are arranged on the installation shell; divergent light output by the optical fiber connector is converged into parallel light beams by the fixed parabolic focusing mirror, and the optical axes of the fixed parabolic focusing mirror and the optical axis of the Y-direction rotating parabolic focusing mirror are kept on the same straight line; the Y-direction magnetic control coil drives the Y-direction vibration shaft to further drive the Y-direction rotating paraboloid focusing mirror to focus into light spots on a scanned object, and because the optical fiber output end does not adopt an optical fiber collimating mirror with a spherical or aspherical lens structure, the light beam focusing does not adopt a lens mode, so that the aberration caused by the lens is avoided.
Description
Technical Field
The utility model belongs to the technical field of the coherent tomography of optics, concretely relates to optical tomography scanning device.
Background
The optical coherence tomography technology obtains the chromatographic capacity in the depth direction based on the low coherence light interference principle, reconstructs the internal structure of a biological tissue or material through scanning, the signal contrast of the internal structure is derived from the spatial change of the optical reflection (scattering) characteristic of the biological tissue or material, an optical scanning device is very important for the imaging result, and the aberration of a scanning light path directly influences the imaging resolution.
The existing scanning device realizes scanning in two directions by utilizing mutually orthogonal rotating motors, and then focuses light beams through a focusing lens to realize scanning of a scanned object. For a broadband light source in the field of optical coherence tomography, the aberration of the focusing lens affects the system resolution.
SUMMERY OF THE UTILITY MODEL
In view of the above problems of the prior imaging scanner, the present invention is directed to an optical tomography scanner with compact structure and reliable operation.
The utility model provides a technical scheme that its technical problem adopted is: an optical tomography scanning device comprises a mounting shell, an optical fiber joint, a fixed paraboloid focusing mirror, a Y-direction rotating paraboloid focusing mirror, a Y-direction vibrating shaft and a magnetic control coil, wherein the optical fiber joint, the fixed paraboloid focusing mirror, the Y-direction rotating paraboloid focusing mirror, the Y-direction vibrating shaft and the magnetic control coil are mounted on the mounting shell; divergent light output by the optical fiber connector is converged into parallel light beams by the fixed parabolic focusing mirror, and the optical axes of the fixed parabolic focusing mirror and the optical axis of the Y-direction rotating parabolic focusing mirror are kept on the same straight line; the Y-direction vibration shaft drives the Y-direction rotating paraboloid focusing mirror to focus into light spots on the scanned object through the Y-direction magnetic control coil, and one-direction scanning is realized.
Furthermore, the optical tomography scanning device also comprises an X-direction plane reflecting mirror, an X-direction vibration shaft and an X-direction magnetic control coil which are arranged on the mounting shell; the convergent light beam focused by the Y-direction rotating parabolic focusing mirror passes through the X-direction plane reflecting mirror, and the X-direction magnetic control coil drives the X-direction vibration shaft to drive the X-direction plane reflecting mirror to scan in the other direction on the scanned object.
Furthermore, a gap is formed between the Y-direction vibration shaft and the Y-direction magnetic control coil; and a gap is formed between the X-direction vibration shaft and the X-direction magnetic control coil.
Further, the Y-direction vibration shaft is arranged in the middle position of the torque balance of the Y-direction magnetic control coil; the X-direction vibration shaft is arranged in the middle position of the torque balance of the X-direction magnetic control coil.
Further, the vibration axis in the Y direction and the vibration axis in the X direction are orthogonal to each other.
Further, the axial cross-sections of the X-direction vibration axis and the Y-direction vibration axis are asymmetrical.
Further, the magnetic control coil comprises a magnetic core, a magnetic control coil and a controllable current source; four magnetic poles of the magnetic core are wound around two magnetic control coils, the magnetic control coils are divided into two groups and driven by respective controllable current sources, and the outer portions of the magnetic control coils are connected with the controllable current sources.
Further, the magnetic control coils comprise two groups of first magnetic control coils and second magnetic control coils; the controllable current source comprises a first controllable current source for driving the first magnetic control coil and a second controllable current source for driving the second magnetic control coil.
Compared with the prior art, the beneficial effects of the utility model are that: the device is fixed in a single mounting shell, so that the device has compact structure and reliable work, divergent light output by the optical fiber is converged into parallel light beams by utilizing the fixed parabolic focusing mirror, and the light beam focusing does not adopt a lens mode because the optical fiber output end does not adopt an optical fiber collimating mirror with a spherical or aspherical lens structure, thereby avoiding aberration caused by the lens.
Drawings
Fig. 1 is a schematic view of the device for one-dimensional scanning according to the present invention;
fig. 2 is a schematic view of the two-dimensional scanning apparatus of the present invention;
fig. 3a is a schematic diagram of the first controllable current source outputting current and the second controllable current source outputting zero according to the present invention;
fig. 3b is a schematic diagram of the second controllable current source outputting current and the first controllable current source outputting zero according to the present invention;
fig. 3c is a schematic diagram of the present invention, wherein the first controllable current source is fixed to output current, and the vibration shaft is driven to rotate clockwise by changing the magnitude of the second controllable current source;
FIG. 4 is a schematic structural diagram of a conventional scanning apparatus;
in the drawings: 1. the optical fiber connector, 2, a fixed parabolic focusing mirror, 3, a mounting shell, 4, a Y-direction rotating parabolic focusing mirror, 5, a Y-direction vibration shaft, 6, a Y-direction magnetic control coil, 7, a scanned object, 8, an X-direction plane reflecting mirror, 9, an X-direction vibration shaft and 10, an X-direction magnetic control coil; 21. the magnetic core, 22, a first magnetic control coil, 23, a second magnetic control coil, 24, a first controllable current source and 25, a second controllable current source.
Detailed Description
The present invention will be described in further detail with reference to specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The utility model provides an optical tomography scanning device for solve current scanning device's problem, the scanning of two directions is realized to the rotating electrical machines 11 and the rotating electrical machines 12 that utilize the quadrature of each other as shown in figure 4 prior art, and rethread focusing lens 13 focuses on the beam, realizes the scanning to scanned object 14. For a broadband light source in the field of optical coherence tomography, the aberration of the focusing lens affects the system resolution.
As shown in fig. 1-3, the optical tomography scanning device of the present invention comprises 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, a Y-direction vibration shaft 5 and a Y-direction magnetic control coil; divergent light output by the optical fiber connector 1 is converged into parallel light beams through the fixed parabolic focusing mirror 2, and the optical axes of the fixed parabolic focusing mirror 2 and the Y-direction rotating parabolic focusing mirror 4 are kept on the same straight line; the Y-direction magnetic control coil 6 drives the Y-direction vibration shaft 5, and then focuses on a scanned object 7 to form light spots by driving the Y-direction rotating paraboloidal focusing mirror 4, so that one-dimensional reciprocating scanning in one direction is realized.
The optical tomography scanning device also comprises an X-direction plane reflecting mirror 8, an X-direction vibration shaft 9 and an X-direction magnetic control coil 10 which are arranged on the mounting shell 3; the Y-direction rotating parabolic focusing mirror 4 can converge into parallel light beams to pass through the X-direction plane reflecting mirror 8, and the X-direction magnetic control coil 10 drives the X-direction vibration shaft 9 to drive the X-direction plane reflecting mirror 8 to scan on the scanned object 7 in the other direction. When the device works, the X, Y-direction vibration shaft rotates in a reciprocating manner at a high speed within a small angle, so that a focusing light spot performs two-dimensional scanning on the surface of a scanned object, a convergent light beam formed by the Y-direction rotating paraboloidal focusing mirror 4 passes through the X-direction plane reflecting mirror 8 to realize scanning around the X direction, the two scanning directions are orthogonal to each other, the two-dimensional scanning of the scanned object 7 in two directions is realized, and if only one direction is needed to be scanned, the X-direction plane reflecting mirror, the X-direction vibration shaft 9 and the X-direction magnetic control coil can be omitted; meanwhile, all optical elements through which the light beams pass after being output from the optical fibers are reflecting surfaces, so that lens aberration can be avoided.
The Y-direction vibration shaft 5 is arranged in the middle position of the torque balance of the Y-direction magnetic control coil 6; the X-direction vibration shaft 9 is disposed at a middle position of the X-direction magnetron coil 10 where the torque is balanced.
A gap is formed between the Y-direction vibration shaft 5 and the Y-direction magnetic control coil 6; the X-direction vibration shaft 9 and the X-direction magnetic control coil 10 are provided with gaps, the Y-direction vibration shaft 5 and the X-direction vibration shaft 9 are not provided with magnetic control coils, so that the rotational inertia of the X-direction vibration shaft is reduced.
The Y-direction vibration shaft 5 and the X-direction vibration shaft 9 are orthogonal; the axial sections of the X-direction vibration shaft and the Y-direction vibration shaft are asymmetric, and due to the asymmetric axial sections, when an external magnetic circuit is changed, the shaft can generate a certain rotating torque, and when the shaft vibrates in a small-angle reciprocating mode near a balance position, the deflection angle and the working current are guaranteed to keep an approximate linear relation.
The magnetic control coil comprises a magnetic core 21, a magnetic control coil and a controllable current source; four magnetic poles of the magnetic core 21 are wound around two magnetic control coils, and the outside of each magnetic control coil is connected with the controllable current source; the magnetic control coils comprise two groups of first magnetic control coils 22 and second magnetic control coils 23; the controllable current source comprises a first controllable current source 24 driving the first magnetron coil 22 and a second controllable current source 25 driving the second magnetron coil 23. When the vibration frequency control device is used, the first controllable current source 24 for driving the first magnetic control coil 22 outputs constant current, the Y-direction vibration shaft 5 and the X-direction vibration shaft 9 are driven to vibrate at high speed within a small angle range by changing the magnitude and the direction of the current output by the second controllable current source 25, the magnitude of the current output by the current source is reasonably selected according to the magnitude of the load moment of inertia, and the vibration frequency requirement can be met as each group of coils is driven by the independent first controllable current source 24 and the second controllable current source 25, and the heat productivity of the magnetic control coils can also be controlled.
Referring to fig. 3a, 3b and 3c, when the first controllable current source 24 outputs a current in the direction indicated by the arrow in fig. 3a and the second controllable current source 25 outputs zero, the magnetic lines generated by the four poles A, B, C and D of the magnetic core 21 are in the direction indicated by fig. 3a, the magnetic lines are coupled by the shaft, and the Y-direction vibration shaft 5 or the X-direction vibration shaft 9 is in the middle position of torque balance. When the second controllable current source 25 outputs a directional current as shown in fig. 3b and the first controllable current source 24 outputs zero, the magnetic lines generated by the four magnetic poles A, B, C and D of the magnetic core 21 are oriented as shown in fig. 3b, the magnetic lines are coupled by the shaft, and the Y-direction vibration shaft 5 or the X-direction vibration shaft 9 is located at a middle position of torque balance. In fig. 3a and 3b, the A, D magnetic lines of the magnetic poles have the same direction, and the B, C magnetic lines of the magnetic poles have opposite directions. If the magnitude and direction of the current output by the first controllable current source 24 are kept constant as shown in fig. 3a, and the current output by the second controllable current source 25 is in the direction shown in fig. 3b, the magnetic induction of the A, D magnetic pole is strengthened and the magnetic induction of the B, C magnetic pole is weakened, and the Y-direction vibration axis 5 and the X-direction vibration axis 9 are rotated clockwise by a certain angle to a new equilibrium position, as shown in fig. 3 c. Through calculation, when the deflection angle is small, the angle and the coil current approximately keep a linear relation; by changing the current direction of the second controllable current source 25 in fig. 3c, the Y-direction vibration axis 5 and the X-direction vibration axis 9 rotate counterclockwise.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. An optical tomography scanning apparatus characterized by: the device comprises an installation shell (3), an optical fiber connector (1) arranged on the installation shell (3), a fixed parabolic focusing mirror (2), a Y-direction rotating parabolic focusing mirror (4), a Y-direction vibration shaft (5) and a Y-direction magnetic control coil (6); divergent light output by the optical fiber connector (1) is converged into parallel light beams through the fixed parabolic focusing mirror (2), and the optical axes of the fixed parabolic focusing mirror (2) and the Y-direction rotating parabolic focusing mirror (4) are kept on the same straight line; the Y-direction magnetic control coil (6) drives the Y-direction vibration shaft (5), and then the Y-direction rotating paraboloid focusing mirror (4) is driven to focus on a scanned object (7) to form light spots, and one-direction scanning is realized.
2. The optical tomography scanning device of claim 1, wherein: the optical tomography scanning device also comprises an X-direction plane reflecting mirror (8), an X-direction vibration shaft (9) and an X-direction magnetic control coil (10), wherein the X-direction plane reflecting mirror is arranged on the mounting shell (3); the convergent light beam focused by the Y-direction rotating parabolic focusing mirror (4) passes through the X-direction plane reflecting mirror (8), and the X-direction magnetic control coil (10) drives the X-direction vibration shaft (9) to drive the X-direction plane reflecting mirror (8) to scan in the other direction on the scanned object (7).
3. The optical tomography scanning device of claim 2, wherein: a gap is arranged between the Y-direction vibration shaft (5) and the Y-direction magnetic control coil (6); and a gap is formed between the X-direction vibration shaft (9) and the X-direction magnetic control coil (10).
4. The optical tomography scanning device of claim 3, wherein: the Y-direction vibration shaft (5) is arranged in the middle position of the torque balance of the Y-direction magnetic control coil (6); the X-direction vibration shaft (9) is arranged in the middle position of the torque balance of the X-direction magnetic control coil (10).
5. The optical tomography scanning device of claim 4, wherein: the Y-direction vibration shaft (5) and the X-direction vibration shaft (9) are orthogonal.
6. The optical tomography scanning device of claim 5, wherein: the axial sections of the X-direction vibration shaft (9) and the Y-direction vibration shaft (5) are asymmetrical.
7. The optical tomography scanning apparatus of any of claims 1-4, wherein: the magnetic control coil comprises a magnetic core (21), a magnetic control coil and a controllable current source; four magnetic poles of the magnetic core (21) are wound around two magnetic control coils, and the magnetic control coils are divided into two groups and driven by respective controllable current sources.
8. The optical tomography scanning device of claim 7, wherein: the magnetic control coils comprise two groups of first magnetic control coils (22) and second magnetic control coils (23); the controllable current source comprises a first controllable current source (24) driving the first magnetron coil (22) and a second controllable current source (25) driving the second magnetron coil (23).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2019202732055 | 2019-03-05 | ||
| CN201920273205 | 2019-03-05 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210072202U true CN210072202U (en) | 2020-02-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920828641.4U Expired - Fee Related CN210072202U (en) | 2019-03-05 | 2019-06-04 | Optical tomography scanning device |
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| CN (1) | CN210072202U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110095863A (en) * | 2019-03-05 | 2019-08-06 | 天津欧斯迪医疗科技有限公司 | A kind of optical tomography scanning means |
-
2019
- 2019-06-04 CN CN201920828641.4U patent/CN210072202U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110095863A (en) * | 2019-03-05 | 2019-08-06 | 天津欧斯迪医疗科技有限公司 | A kind of optical tomography scanning means |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200214 Termination date: 20210604 |
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| CF01 | Termination of patent right due to non-payment of annual fee |