Smooth ring system and medical imaging device

Abstract

The application discloses a smooth ring system and medical imaging equipment, the smooth ring system includes a fixed mechanism and a rotating mechanism, the rotating mechanism includes a rotor and a light guide fiber arranged along the circumference of the rotor; the fixed mechanism is used for generating a first emission signal modulated by a first carrier light wave, the first emission signal is injected into the light guide fiber through a first light wave entrance of the light guide fiber at a preset incident angle; the first emission signal is transmitted along the light guide fiber; the rotor is used for receiving the first emission signal transmitted by the light guide fiber. The smooth ring system, the rotating mechanism and the fixed mechanism are no longer connected in communication through a sliding contact, and the fixed mechanism can be used as a communication initiator, so that the fixed mechanism initiates communication to the rotating mechanism, and the carrier light wave of the fixed mechanism is conducted in the light guide fiber without emission, so that the signal of the fixed mechanism does not interfere with the transmission of the signal of the rotating mechanism in the air.

Description

Technical Field

[0001] This invention relates to the field of optoelectronic communication technology, and in particular to a smooth ring system. Background Technology

[0002] A slip ring system typically consists of two parts: a stationary component and a rotating component, namely a stator and a rotor. It is used to transmit power and data signals from a continuously rotating rotor to the stator. Slip ring systems are applied in many technical fields. In medical imaging equipment, such as traditional CT slip rings, carbon brushes are typically used as sliding contacts. However, this method suffers from performance disadvantages such as easy physical wear of the contacts, susceptibility to external electromagnetic interference in signal transmission, and strong dependence on bit error rate and environmental conditions. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the defects of the slip ring of the medical imaging equipment in the prior art, which uses carbon brush as the sliding contact, resulting in easy physical wear of the contact and low communication accuracy, and to provide a smooth ring system.

[0004] The present invention solves the above-mentioned technical problems through the following technical solution:

[0005] The present invention provides a smooth ring system, the smooth ring system including a fixing mechanism and a rotating mechanism, the rotating mechanism including a rotor and an optical fiber arranged along the circumference of the rotor;

[0006] The fixing mechanism is used to generate a first transmitted signal modulated by a first carrier light wave. The first transmitted signal is injected into the optical fiber through the first light wave inlet of the optical fiber at a preset incident angle. The first transmitted signal is transmitted along the optical fiber.

[0007] The rotor is used to receive the first transmitted signal transmitted by the optical fiber.

[0008] Preferably, the first optical wave inlet is disposed along the outermost circumference of the optical fiber, and the depth of the first optical wave inlet is equal to the cladding thickness of the optical fiber; and / or,

[0009] The preset incident angle is determined based on the refractive index of the first emitted signal in the optical fiber, the refractive index in the cladding of the optical fiber, and the refractive index in air.

[0010] Preferably, the optical fiber includes a progressive multimode fiber; the progressive multimode fiber includes a cladding with a preset refractive index and is arranged along the circumference of the rotor with a preset bending radius.

[0011] Preferably, the rotating mechanism is used to generate a second transmitted signal modulated by a second carrier light wave, the second transmitted signal being injected into the optical fiber through a second light wave inlet; the second carrier light wave is different from the first carrier light wave; the second transmitted signal is transmitted along the optical fiber and refracted outward from the optical fiber;

[0012] The fixing mechanism is also used to receive the second transmitted signal refracted by the optical fiber.

[0013] Preferably, the rotating mechanism further includes a first light emitting module and a first light receiving module;

[0014] The first optical emitting module is used to generate the second emission signal, and the second emission signal is injected into the optical fiber through the second optical wave inlet of the optical fiber;

[0015] The first optical receiving module is used to receive the first transmitted signal transmitted by the optical fiber;

[0016] The fixing mechanism includes a second optical transmitting module and a second optical receiving module;

[0017] The second optical emission module is used to generate the first emission signal, and the first emission signal is injected into the optical fiber through the first optical wave inlet at a preset incident angle;

[0018] The second optical receiving module is used to receive the second transmitted signal refracted by the optical fiber.

[0019] Preferably, the first optical transmitting module and the first optical receiving module are connected to the second optical inlet of the optical fiber via an optical splitter and an optical combiner; and / or,

[0020] The first optical emitting module includes a first light source, a first driving unit, a first electro-optic modulation unit, and a first optical amplifier; the first light source, the first driving unit, the first electro-optic modulation unit, and the first optical amplifier are connected in sequence; and / or,

[0021] The first optical receiving module includes a first photoelectric sensor, a first optical amplifier, and a first demodulation unit; the first photoelectric sensor, the first optical amplifier, and the first demodulation unit are connected in sequence; and / or,

[0022] The second optical emitting module includes a second light source, a second driving unit, a second electro-optic modulation unit, and a second optical amplifier; the second light source, the second driving unit, the second electro-optic modulation unit, and the second optical amplifier are connected in sequence; and / or,

[0023] The second optical receiving module includes a second photoelectric sensor, a second optical amplifier, and a second demodulation unit; the second photoelectric sensor, the second optical amplifier, and the second demodulation unit are connected in sequence.

[0024] Preferably, the first optical emitting module includes at least two optical emitting units;

[0025] The at least two optical emitting units are used to generate second transmission signals with different frequency ranges;

[0026] The second optical receiving module includes at least two optical receiving units corresponding to the optical emitting unit;

[0027] The at least two optical receiving units have different sensitivities to the second transmitted signal in different frequency ranges.

[0028] Preferably, the at least two optical receiving units are at the same vertical distance from the rotor.

[0029] Preferably, the second transmitted signal is a visible light carrier wave; the optical fiber is used to uniformly emit the second transmitted signal outward; and / or,

[0030] The second transmitted signal has low attenuation characteristics within a preset distance; the preset distance is greater than the circular length of the rotor.

[0031] The present invention also provides a medical imaging device, the medical imaging device comprising the smooth ring system described above.

[0032] The positive and progressive effects of this invention are as follows:

[0033] The smooth ring system provided by this invention allows the carrier light wave of the fixed mechanism to be injected into the optical fiber through the optical wave inlet and conducted without exiting the optical fiber, enabling the signal of the fixed mechanism to be transmitted to the rotating mechanism via the carrier light wave. The rotating mechanism and the fixed mechanism no longer communicate through sliding contacts, and the fixed mechanism can act as the initiator of communication, realizing that the fixed mechanism initiates communication with the rotating mechanism. Moreover, the carrier light wave of the fixed mechanism is conducted without exiting the optical fiber, so that the signal of the fixed mechanism will not interfere with the signal transmission of the rotating mechanism in the air. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the first structure of the smooth ring system in Embodiment 1 of the present invention.

[0035] Figure 2 This is a schematic diagram of the second structure of the smooth ring system in Embodiment 2 of the present invention.

[0036] Figure 3This is a first schematic diagram of the injection of the first transmission signal into the optical fiber in Embodiment 2 of the present invention.

[0037] Figure 4 This is a second schematic diagram of the injection of the first transmission signal into the optical fiber in Embodiment 2 of the present invention.

[0038] Figure 5 This is a schematic diagram of the propagation of the first transmitted signal in the optical fiber in Embodiment 2 of the present invention.

[0039] Figure 6 This is a schematic diagram of the stationary mechanism receiving the second transmitted signal refracted by the rotating mechanism in Embodiment 2 of the present invention.

[0040] Figure 7 This is a schematic diagram of the second transmitted signal being refracted from the optical fiber into the air in Embodiment 2 of the present invention.

[0041] Figure 8 This is a schematic diagram of the third structure of the smooth ring system in Embodiment 2 of the present invention. Detailed Implementation

[0042] The present invention will be further illustrated by way of embodiments below, but the present invention is not limited to the scope of the embodiments described herein.

[0043] Example 1

[0044] Please refer to Figure 1 This is a first structural schematic diagram of the smooth ring system in this embodiment. Specifically, the smooth ring system includes a rotating mechanism 1 and a fixing mechanism 2. The rotating mechanism includes a rotor (not shown) and an optical fiber 3 arranged along the circumference of the rotor.

[0045] Rotating mechanism 1 generates a second transmitted signal modulated by a second carrier light wave. This second transmitted signal is injected into the optical fiber 3 through its second light wave inlet 4. The second transmitted signal propagates along the optical fiber 3 and is refracted outwards from the optical fiber 3. Fixing mechanism 2 generates a first transmitted signal modulated by a first carrier light wave. This first transmitted signal is injected into the optical fiber 3 through its first light wave inlet 5. The first transmitted signal can propagate along the optical fiber 3 without outward refraction. The second carrier light wave is different from the first carrier light wave; specifically, the first carrier light wave has a first wavelength, and the second carrier light wave has a second wavelength different from the first wavelength. Rotating mechanism 1 also receives the first transmitted signal transmitted by the optical fiber 3; fixing mechanism 2 also receives the second transmitted signal refracted by the optical fiber 3.

[0046] Specifically, in conventional step-index optical fibers, light waves undergo total internal reflection in the cladding, and then propagate in a zigzag pattern along the fiber axis. In this embodiment, the optical fiber 3 undergoes special treatment to propagate light waves of different wavelengths in different ways. The cladding of the optical fiber 3 is made of a material with a special refractive index and is mounted on the rotating mechanism with a specific bending radius. When the output light enters the fiber, the bending radius changes the incident angle of the beam relative to the cladding, and the special refractive index of the cladding causes some light to be refracted and leave the optical fiber 3. For the second emission signal of the second wavelength generated by the rotating mechanism 1, after the second emission signal is injected into the optical fiber 3 through the second light wave inlet 4, some light waves are refracted outwards from the optical fiber 3 during propagation. The fixing mechanism 2 can receive this portion of the second emission signal refracted by the optical fiber 3. For the first transmitted signal of the first wavelength generated by the fixed mechanism 2, since the second wavelength is different from the first wavelength, after the first transmitted signal is injected into the optical fiber 3 through the first optical wave inlet 5, it will not be refracted outward when it propagates in the optical fiber 3 whose fiber core has been specially treated, and thus will not interfere with the refracted second transmitted signal. In an optional embodiment, the second optical wave inlet 4 can also be used as the optical wave outlet. The optical receiving module of the rotating mechanism 1 can be directly connected to the second optical wave inlet 4 of the optical fiber 3 to receive the first transmitted signal propagated by the optical fiber 3.

[0047] The smooth ring system provided by this invention allows the second transmission signal of the rotating mechanism to be emitted through an optical fiber and received by the fixed mechanism, enabling the signal of the rotating mechanism to be transmitted to the fixed mechanism via a carrier light wave. The carrier light wave of the fixed mechanism can be injected into the optical fiber through the optical wave inlet and propagated in the optical fiber without being emitted, enabling the signal of the fixed mechanism to be transmitted to the rotating mechanism via a carrier light wave. The rotating mechanism and the fixed mechanism no longer communicate through sliding contacts, and both the rotating mechanism and the fixed mechanism can act as communication initiators, realizing bidirectional synchronous communication between the rotating mechanism and the fixed mechanism. Furthermore, the carrier light wave of the fixed mechanism is propagated in the optical fiber without being emitted, ensuring that the signal of the fixed mechanism does not interfere with the signal of the rotating mechanism transmitted in the air.

[0048] Example 2

[0049] Please refer to Figure 2This is a schematic diagram of the second structure of the smooth ring system in this embodiment. In an optional embodiment, the rotating mechanism 1 further includes a first light emitting module 6 and a first light receiving module 7; the first light emitting module 6 is used to generate a second emission signal, which is injected into the optical fiber 3 through the second light wave inlet 4; the first light receiving module 7 is used to receive the first emission signal transmitted by the optical fiber 3; the fixing mechanism 2 includes a second light emitting module 8 and a second light receiving module 9; the second light emitting module 8 is used to generate a first emission signal, which is injected into the optical fiber 3 through the first light wave inlet 5; the second light receiving module 9 is used to receive the second emission signal refracted by the optical fiber 3.

[0050] In one optional embodiment, the first optical wave inlet 5 is arranged along the outermost circumference of the optical fiber 3, and the depth of the first optical wave inlet 5 is equal to the cladding thickness of the optical fiber 3; the second optical emission module 8 is specifically used to inject the first emission signal into the optical fiber 3 through the first optical wave inlet 5 at a preset incident angle.

[0051] In one alternative embodiment, the preset incident angle is determined based on the refractive index of the first emitted signal in the optical fiber 3, the refractive index in the cladding of the optical fiber 3, and the refractive index in air. For example... Figure 3 As shown, due to the special treatment of the fiber cladding (such as photolithography on the cladding material), an extremely narrow gap is designed around the entire circumference of the fiber outer diameter, so that the first emission signal of a specific wavelength A (first wavelength) emitted by the fixing mechanism 2 can only enter the fiber core through refraction at this specific spatial angle. Light waves outside this specific spatial angle cannot enter the fiber, thereby realizing non-contact high-fidelity injection of the signal.

[0052] Specifically, such as Figure 4 As shown, the incident angle α of the first emitted signal at a specific wavelength A (first wavelength) relative to the tangent of the optical fiber 3; as Figure 5 As shown, when the first emitted signal (the incident light signal carrying control signal information) of the specific wavelength A (first wavelength) directly contacts the critical surface of the fiber core through the cladding slit, the specific optical incident angle α1 (α = 90° - α1) must satisfy condition 1: n 空 Let n be the refractive index of the first transmitted signal in air. 芯A Let α1 be the refractive index of the first transmitted signal in the optical fiber 3; preferably, α1 is in the range of [77°, 82°]; the first transmitted signal of the specific wavelength A (first wavelength) enters the fiber core with a refraction angle α2, and when it contacts the critical surface between the fiber core and the cladding, the optical reflection angle must be greater than the total reflection angle, that is, condition 2 must be satisfied: n 包A is the refractive index of the first transmitted signal in the cladding of optical fiber 3.

[0053] Because the optical fiber path is an arc with a radius of curvature R, the reflection angle increases with each subsequent total internal reflection within the fiber core. This ensures that the first transmitted signal of the first wavelength can be transmitted through the optical fiber without leakage or emission until it reaches the optical receiving unit on the rotor side. In an optional embodiment, the first optical transmitting module 6 and the first optical receiving module 7 are connected to the second optical wave inlet 4 of the optical fiber 3 via an optical splitter and an optical combiner.

[0054] In one alternative implementation, the second transmitted signal of the second wavelength has low attenuation characteristics within a preset distance; the preset distance is greater than the circular length of the rotor.

[0055] In one alternative implementation, the second transmitted signal is a visible light carrier wave with constant brightness; the optical fiber 3 is used to uniformly emit the second transmitted signal outward.

[0056] Specifically, the cladding refractive index of the optical fiber 3 is designed to allow a second transmitted signal of a specific wavelength B (the second wavelength) to be refracted outward at a specific narrow angle from the fiber core under a specific radius of curvature of the rotor circumference. Carrier light waves propagating at other angles in the optical fiber 3 can only undergo total internal reflection between the core and the cladding until they reach the light absorption device 10 of the rotating mechanism.

[0057] like Figure 6 As shown, the optical receiving module 9, installed on the fixed mechanism, is positioned at a fixed point, and the optical sensor within it is installed at a specific angle. Therefore, the optical signal received by the optical receiving module 9 consists only of the second transmitted signal refracted from the optical fiber. Thus, the second transmitted signal (mainly image data) emitted from the rotating side can be considered to be refracted outwards to the optical receiving module 9 with good uniformity within a circumference, achieving non-contact signal transmission from the CT rotating side to the stationary side. In an optional embodiment, the optical fiber 3 includes a progressive multimode fiber; the progressive multimode fiber includes a cladding with a preset refractive index and is arranged along the circumference of the rotor with a preset bending radius. Optical communication design can further improve the optical communication rate using multimode fiber. The multimode fiber core undergoes special treatment, such as using progressive multimode fiber or doped negative dispersion fiber, to reduce optical communication scattering, such as intermodal scattering or chromatic scattering. The refractive index of the progressive multimode fiber core varies depending on the radius, with the refractive index n(r). By changing the propagation speed of light in media with different refractive indices, signal distortion caused by the optical path difference between different modes can be compensated. like Figure 7As shown, when the first transmitted signal is incident on the optical fiber, after refraction, part of the light wave enters the cladding, and after secondary refraction, leaves the optical fiber and is received by the first optical receiving module. The optical fiber is configured with a radius of curvature of R, where the core thickness is d1 and the refractive index is n1, and the cladding thickness is d2 and the refractive index is n2. Therefore, the first transmitted signal is received at an incident angle θ. i Entering the cladding, for a given radius of curvature R, θ can be derived. i (R,d1,d2), in order for the incident light wave to enter the cladding through refraction, θ i The total internal reflection angle must be smaller than that at the fiber core-cladding interface. The angle of refraction is determined by the refractive index of the cladding. For a refracted light wave to exit after incident on the cladding-air interface with a given angle of refraction, the angle of incidence at the cladding-air interface must be less than the angle of total internal reflection. Therefore, the range of cladding refractive index can be deduced.

[0058] In addition, optical communication has the advantages of being unaffected by electromagnetic interference and having low cost. It can also improve communication bandwidth through methods such as time division multiplexing, wavelength division multiplexing, and space division multiplexing.

[0059] Taking a CT (Computed Tomography) smooth ring system as an example, the process of transmitting signals from the rotating mechanism to the fixed mechanism is first explained. The first optical emission module 6 generates carrier light waves for CT image data and / or measurement signals, which are then directly injected into the core of the optical fiber 3 through the second optical wave inlet 4. The optical fiber 3 has no protective layer and allows carrier-modulated light waves of specific signals to refract outwards with good uniformity from within the optical waveguide medium of the optical fiber 3 within a circumference of the CT rotor (i.e., the total length of the fiber). The carrier-modulated light waves can be emitted with constant brightness (emitting a modulated light carrier in the form of visible light) or emitted as electromagnetic waves (such as infrared or near-ultraviolet invisible light waves). The second emitted signal has low attenuation characteristics over a preset distance greater than the total length of the fiber. The second emitted signal propagates in the optical fiber 3 along the direction of the dashed arrow in the figure. The second optical receiving module 9 is fixedly placed at a certain point on the projection of the optical fiber 3 on the stationary side of the CT gantry in the smooth ring system. The carrier-modulated light refracted by the optical fiber 3 can be sensed, identified, demodulated and received by the second optical receiving module 9 from the stator side of the CT gantry, thereby completing the non-contact signal transmission of CT image data and measurement signals from the rotor side to the stator side.

[0060] Secondly, the process of transmitting signals from the fixed mechanism to the rotating mechanism is explained. The second optical transmitting module 8 is used to generate carrier-modulated light or carrier-modulated laser for the CT control signal. By adjusting the mechanical angle α of the second optical transmitting module 8, the first transmitted signal can be injected into the optical fiber medium with high fidelity through the first optical wave inlet 5 at a suitable or specific incident angle α via the air. Once injected, the first transmitted signal hardly refracts out of the fiber core within the arc path of the optical fiber 3. Specifically, the optical fiber 3 is treated with a special process (such as photolithography) to have an extremely narrow slit along its outermost circumference, with a depth equal to the thickness of the fiber cladding (the optical fiber has no protective layer). The purpose of this slit is to allow carrier light waves of a specific wavelength to be injected into the fiber core of the optical fiber 3 under specific incident conditions. The first transmitted signal propagates in the optical fiber 3 in the direction of the solid arrow in the figure, and then the carrier-modulated light or carrier-modulated laser of the control signal reaches the first optical receiving module 7 through the optical fiber waveguide, thereby realizing the contactless transmission of the control signal from the stator side to the rotor side.

[0061] The second optical emission module 8 can employ various laser frequency modulation methods, as well as suitable internal modulation methods such as optical intensity modulation and phase modulation, and external modulation methods (such as electro-optic modulation and acousto-optic modulation).

[0062] Furthermore, the connection method of each module of the optical fiber 3 and the rotating mechanism 1 is further explained. The optical fiber 3 runs along a smooth CT ring circumference, with only one fiber. One end, the second optical wave inlet 4, is connected to an optical splitter / combiner module 15, while the other end, the fiber tail, is not connected to any device. The rotating mechanism 1 also includes a light absorption device 10, which absorbs the optical signal output at the fiber tail, thereby preventing the output optical signal from interfering with the photodetector and preventing reflected light from entering the optical fiber 3. The light absorption device 10 is located on the rotating mechanism.

[0063] When the optical splitter / combiner module 15 performs the 1:2 splitter function (along the direction of the solid arrow in the figure), one optical fiber is connected to the first optical receiver module 7 to transmit control signals. Although the other optical fiber is connected to the first optical transmitter module 6, the first optical transmitter module 6 does not contain a photoelectric conversion unit, so the split signal is not received. When the optical splitter / combiner module 15 performs the 2:1 combiner function, since the first optical receiver module 7 does not emit optical signals, only the optical signal emitted by the first optical transmitter module 6 passes through the combiner and is refracted outwards with good uniformity along the rotor optical fiber within one circumference of the CT rotor. This can be achieved by emitting light at a constant brightness (emitting a modulated optical carrier in the form of visible light) or by emitting electromagnetic waves (such as near-infrared or near-ultraviolet invisible light modulated optical carriers). The optical signal is then sensed, identified, demodulated, and received by the second optical receiver module 9, completing the contactless transmission of CT image data and / or measurement signals from the rotor side to the stator side.

[0064] The first optical transmitting module 6 may contain multiple light sources (such as TxA1, TxA2, ... TxAn). By utilizing the optical combiner function in the optical splitter / optical combiner module 15, high-bandwidth optical communication based on wavelength division multiplexing technology can be realized. In this variation, the first optical emitting module 6 has a tunable semiconductor laser diode and an optical combiner, and the second optical receiving module 9 has a tunable narrowband optical filter unit and a channel selector to synchronously extract modulated signals such as TxA1 (e.g., image data), TxA2 (e.g., measurement signals), ... and TxAn from different channel optical carrier frequencies for demodulation, thereby increasing the solid line communication bandwidth and transmission rate; when the optical splitter / optical combiner module 15 performs the N:1 optical combiner function to achieve wavelength division multiplexing (along the direction of the dashed arrow in the figure), the optical signals emitted by the plurality of light sources TxA1, TxA2...TxAn in the first optical emitting module 6 are combined and then refracted outward with good uniformity along the optical fiber 3 within one circumference of the CT rotor.

[0065] In one optional embodiment, the first light emitting module 6 includes a first light source, a first driving unit, a first electro-optic modulation unit, and a first optical amplifier; the first light source, the first driving unit, the first electro-optic modulation unit, and the first optical amplifier are connected in sequence. The first light receiving module 7 includes a first photoelectric sensor, a first optical amplifier, and a first demodulation unit; the first photoelectric sensor, the first optical amplifier, and the first demodulation unit are connected in sequence. The second light emitting module 8 includes a second light source, a second driving unit, a second electro-optic modulation unit, and a second optical amplifier; the second light source, the second driving unit, the second electro-optic modulation unit, and the second optical amplifier are connected in sequence. The second light receiving module 9 includes a second photoelectric sensor, a second optical amplifier, and a second demodulation unit; the second photoelectric sensor, the second optical amplifier, and the second demodulation unit are connected in sequence. The first light receiving module 7 and the second light receiving module 9 also each include a focusing lens.

[0066] In one optional embodiment, the first optical emitting module 6 includes at least two optical emitting units; the at least two optical emitting units are used to generate second transmitted signals in different frequency ranges; the second optical receiving module 9 includes at least two optical receiving units corresponding to the optical emitting units; the at least two optical receiving units have different sensitivities to the second transmitted signals in different frequency ranges.

[0067] In one alternative implementation, at least two light receiving units are at the same vertical distance from the rotor.

[0068] The following examples further illustrate this point. For instance... Figure 8As shown, the first optical emitting module 6 includes a first optical emitting unit 11 and a second optical emitting unit 12; the first optical emitting unit 11 is used to generate a second transmitted signal in a first frequency range, and the second optical emitting unit 12 is used to generate a second transmitted signal in a second frequency range. The second optical receiving module 9 includes a first optical receiving unit 13 and a second optical receiving unit 14; the sensitivity of the first optical receiving unit 13 to the second transmitted signal in the first frequency range is greater than the sensitivity of the second optical receiving unit 14 to the second transmitted signal in the first frequency range; the sensitivity of the first optical receiving unit 13 to the second transmitted signal in the second frequency range is less than the sensitivity of the second optical receiving unit 14 to the second transmitted signal in the second frequency range. The second transmitted signal propagates in the optical fiber 3 along the direction of the dashed arrow in the figure. The first optical receiving unit 13 and the second optical receiving unit 14 are symmetrically distributed on both sides of the axis of the rotating mechanism 1, i.e., L1 = L2.

[0069] In addition, the first optical receiving unit and the second optical receiving unit simultaneously receive the second transmitted signal output from the side of the optical fiber 3, thereby compensating for the signal loss caused by the gap between the beginning and end sections of the optical fiber 3.

[0070] The smooth ring system provided by this invention features a carrier light wave from the rotating mechanism that exhibits low attenuation along the entire length of the optical fiber. This allows the light to refract outwards with good uniformity within the optical waveguide medium of the fiber, and then be received by the fixed mechanism, enabling the signal from the rotating mechanism to be transmitted to the fixed mechanism via the carrier light wave. The carrier light wave from the fixed mechanism can be injected into the optical fiber with high fidelity through a first light wave inlet that allows only specific wavelengths of light to pass through at specific angles at a suitable or specific incident angle, and then propagated within the optical fiber without exiting, allowing the signal from the fixed mechanism to be transmitted to the rotating mechanism via the carrier light wave. The rotating and fixed mechanisms no longer communicate via sliding contacts, and both can act as communication initiators, achieving contactless bidirectional communication between them. Furthermore, the carrier light wave from the fixed mechanism propagates without exiting the optical fiber, ensuring that the signal from the fixed mechanism does not interfere with the signal transmission of the rotating mechanism in the air. The smooth ring system also offers advantages such as immunity to electromagnetic interference and low cost, and can improve communication bandwidth through time-division multiplexing, wavelength-division multiplexing, and space-division multiplexing.

[0071] Example 3

[0072] This embodiment provides a medical imaging device, which includes the smooth ring system of Embodiment 1.

[0073] The medical imaging device provided by the present invention utilizes the smooth ring system in Embodiment 1 or Embodiment 2. The rotating mechanism and the fixed mechanism of the smooth ring system no longer communicate through sliding contact parts. Both the rotating mechanism and the fixed mechanism can be used as the initiator of communication, realizing contactless bidirectional communication between the rotating mechanism and the fixed mechanism. Moreover, the signal of the fixed mechanism will not interfere with the signal of the rotating mechanism in the air.

[0074] While specific embodiments of the present invention have been described above, those skilled in the art should understand that these are merely illustrative examples, and the scope of protection of the present invention is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but all such changes and modifications fall within the scope of protection of the present invention.

Claims

1. A smooth ring system, the smooth ring system comprising a fixing mechanism and a rotating mechanism, characterized in that, The rotating mechanism includes a rotor and an optical fiber arranged along the circumference of the rotor; The fixing mechanism is used to generate a first transmitted signal modulated by a first carrier light wave, and the first transmitted signal is injected into the optical fiber through the first light wave inlet of the optical fiber at a preset incident angle. The first transmitted signal is transmitted along the optical fiber, and the first transmitted signal is not refracted outward when it is transmitted in the optical fiber; The rotor is used to receive the first transmitted signal transmitted by the optical fiber; The rotating mechanism is used to generate a second transmitted signal modulated by a second carrier light wave. The second transmitted signal is injected into the optical fiber through the second light wave inlet of the optical fiber. The second carrier light wave is different from the first carrier light wave. The second transmitted signal is transmitted along the optical fiber and refracted outward from the optical fiber. The fixing mechanism is also used to receive the second transmitted signal refracted by the optical fiber.

2. The smooth ring system as described in claim 1, characterized in that, The first optical wave inlet is disposed along the outermost circumference of the optical fiber, and the depth of the first optical wave inlet is equal to the cladding thickness of the optical fiber; and / or, The preset incident angle is determined based on the refractive index of the first emitted signal in the optical fiber, the refractive index in the cladding of the optical fiber, and the refractive index in air.

3. The smooth ring system as described in claim 1, characterized in that, The optical fiber includes a progressive multimode fiber; the progressive multimode fiber includes a cladding with a preset refractive index and is arranged along the circumference of the rotor with a preset bending radius.

4. The smooth ring system as described in claim 1, characterized in that, The rotating mechanism further includes a first light emitting module and a first light receiving module; The first optical emitting module is used to generate the second emission signal, and the second emission signal is injected into the optical fiber through the second optical wave inlet of the optical fiber; The first optical receiving module is used to receive the first transmitted signal transmitted by the optical fiber; The fixing mechanism includes a second optical transmitting module and a second optical receiving module; The second optical emission module is used to generate the first emission signal, and the first emission signal is injected into the optical fiber through the first optical wave inlet at a preset incident angle; The second optical receiving module is used to receive the second transmitted signal refracted by the optical fiber.

5. The smooth ring system as described in claim 4, characterized in that, The first optical transmitting module and the first optical receiving module are connected to the second optical wave inlet of the optical fiber via an optical splitter and an optical combiner; and / or, The first optical emitting module includes a first light source, a first driving unit, a first electro-optic modulation unit, and a first optical amplifier; the first light source, the first driving unit, the first electro-optic modulation unit, and the first optical amplifier are connected in sequence; and / or, The first optical receiving module includes a first photoelectric sensor, a first optical amplifier, and a first demodulation unit; the first photoelectric sensor, the first optical amplifier, and the first demodulation unit are connected in sequence; and / or, The second optical emitting module includes a second light source, a second driving unit, a second electro-optic modulation unit, and a second optical amplifier; the second light source, the second driving unit, the second electro-optic modulation unit, and the second optical amplifier are connected in sequence; and / or, The second optical receiving module includes a second photoelectric sensor, a second optical amplifier, and a second demodulation unit; the second photoelectric sensor, the second optical amplifier, and the second demodulation unit are connected in sequence.

6. The smooth ring system as described in claim 4, characterized in that, The first optical emitting module includes at least two optical emitting units; The at least two optical emitting units are used to generate second transmission signals with different frequency ranges; The second optical receiving module includes at least two optical receiving units corresponding to the optical emitting unit; The at least two optical receiving units have different sensitivities to the second transmitted signal in different frequency ranges.

7. The smooth ring system as described in claim 6, characterized in that, The at least two optical receiving units are at the same vertical distance from the rotor.

8. The smooth ring system as described in claim 1, characterized in that, The second transmitted signal is a visible light carrier wave; the optical fiber is used to uniformly emit the second transmitted signal outward.

9. The smooth ring system as described in claim 1 or 8, characterized in that, The second transmitted signal has low attenuation characteristics within a preset distance; the preset distance is greater than the circular length of the rotor.

10. A medical imaging device, characterized in that, The medical imaging device includes the smooth ring system as described in any one of claims 1-9.

Images