Photoelectric encoder in high radiation environment

Abstract

The embodiment of the utility model belongs to the technical field of encoders. The utility model also relates to a photoelectric encoder in a high radiation environment, which comprises a coded disc and a reflective optical fiber amplifier assembly, the coded disc is used for being installed on a motor output shaft, the reflective optical fiber amplifier assembly comprises an optical fiber amplifier, an optical fiber cable and an optical fiber head main body, and the optical fiber head main body is located on one side of the coded disc. One end of the optical fiber cable is fixed on the optical fiber head main body, the other end is connected to the optical fiber amplifier, and the optical fiber amplifier is installed at a radiation shielding position. The optical fiber cable is used for transmitting optical signals, the high radiation resistance of the optical fiber is utilized, stable work in a high-dose radiation environment is ensured, performance reduction is avoided, the optical fiber head body and the optical fiber amplifier are connected through the optical fiber cable, the optical fiber amplifier can be installed at a radiation shielding position, direct exposure in the radiation environment is avoided, and the service life of the optical fiber amplifier is prolonged. And the radiation damage is reduced, so that the service life of the equipment is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of encoders, and more specifically, to a photoelectric encoder in a high radiation environment. Background Art

[0002] In the medical field, especially in the field of radiotherapy, medical electron linear accelerator is an important treatment equipment. Its operation stability and accuracy are directly related to the treatment effect and safety of patients. During the treatment process, the movement speed control of the aperture is one of the key links to ensure the accurate distribution of radiation dose. In order to accurately monitor and control the movement speed of the aperture, photoelectric encoders are widely used in the motor speed feedback system of medical electron linear accelerators. Photoelectric encoders have been widely used in the field of motor speed monitoring due to their small size, high precision, and easy installation. It uses a code disk installed on the rotating shaft at the tail of the motor and uses a photoelectric coupler to detect the light brightness changes caused by the occlusion and transmission of the code disk lines, thereby converting the light signal into an electrical pulse signal. The frequency of these pulse signals is proportional to the rotation speed of the code disk. The microcontroller can accurately calculate the motor speed by reading the number of pulses per unit time, thereby realizing precise control of the aperture movement speed.

[0003] However, in the working environment of medical electron linear accelerator, the aperture motor is usually located close to the radiation source, which makes the photoelectric encoder in a high-dose radiation environment for a long time. Radiation has a significant impact on the performance of electronic components such as photoelectric couplers. Long-term exposure to radiation will cause the performance of photoelectric couplers to deteriorate, which is manifested as reduced sensitivity and increased pulse loss. These problems will directly affect the accuracy of the photoelectric encoder's measurement of motor speed, and then affect the precise control of the aperture movement speed, increase the risk of errors during treatment, and may even pose a threat to the patient's treatment effect and safety. Therefore, we have made improvements to this and proposed a photoelectric encoder for high-radiation environments. Utility Model Content

[0004] The technical problem to be solved by the embodiments of the utility model is that the performance of the speed acquisition encoder of the aperture motor of the medical electron linear accelerator is degraded due to the influence of large doses of radiation.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A photoelectric encoder for a high radiation environment comprises: a code disc and a reflective fiber amplifier assembly, wherein the code disc is used to be mounted on a motor output shaft, the reflective fiber amplifier assembly comprises a fiber amplifier, a fiber optic line and a fiber optic head body, the fiber optic head body is located on one side of the code disc, one end of the fiber optic line is fixed on the fiber optic head body, and the other end is connected to the fiber amplifier, and the fiber optic amplifier is used to be mounted in a radiation shielding position.

[0007] As an improved manner of the utility model, the code disc is located on the tail end of the motor output shaft and rotates with the motor output shaft.

[0008] As an improved manner of the utility model, a mounting piece is connected between the optical fiber head body and the motor, and the mounting piece is arranged at the tail of the motor.

[0009] As an improved manner of the utility model, the mounting member includes a tail buckle mounted on the tail of the motor, a fiber optic head fixing plate is provided on the tail buckle, and the fiber optic head body is fixed on the fiber optic head fixing plate.

[0010] As an improved manner of the utility model, both sides of the tail buckle are fixedly connected with screw tubes, and the screw tubes are connected to the optical fiber head fixing plate by bolts.

[0011] As an improvement of the utility model, a U-shaped groove located between two screw tubes is provided on the tail buckle to adjust the distance between the optical fiber head fixing plate and the code disk.

[0012] As an improved manner of the utility model, the optical fiber head fixing plate is provided with mounting holes for the optical fiber head body.

[0013] As an improved manner of the utility model, the number of the optical fiber lines is two, one of which is used to transmit the light emitted by the optical fiber amplifier, and the other optical fiber line is used to transmit the reflected light.

[0014] As an improvement of the utility model, the optical fiber head body adopts a reflective optical fiber head, which is used to transmit the light emitted by the optical fiber amplifier to the code disk through the optical fiber line, and receive the light reflected by the code disk and transmit it back to the optical fiber amplifier for light intensity detection.

[0015] As an improvement of the utility model, the code disc is made of radiation-resistant material.

[0016] Compared with the prior art, the embodiments of the present invention mainly have the following beneficial effects:

[0017] In order to solve the problem in the prior art that the speed acquisition encoder of the aperture motor of a traditional Chinese electron linear accelerator suffers from the influence of high-dose radiation, resulting in performance degradation, the present application adopts optical fiber to transmit optical signals, and utilizes the high radiation resistance of optical fiber to ensure stable operation in a high-dose radiation environment to avoid performance degradation. The optical fiber head body and the optical fiber amplifier are connected by an optical fiber line, so that the optical fiber amplifier can be installed in a radiation shielding position, avoiding direct exposure to the radiation environment, reducing radiation damage, and thus extending the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of the photoelectric encoder in a high radiation environment provided by this application;

[0019] Figure 2 A schematic diagram of the structure of the encoding disk of the photoelectric encoder in a high radiation environment provided by the present application;

[0020] Figure 3 A schematic diagram of the structure of the optical fiber head fixing plate of the photoelectric encoder in a high radiation environment provided by the present application;

[0021] Figure 4 This is a schematic diagram of the structure of the tail buckle of the photoelectric encoder in a high radiation environment provided by the present application.

[0022] Indicated in the figure:

[0023] 1. Fiber optic amplifier; 2. Fiber optic cable; 3. Fiber optic head body; 4. Fiber optic head fixing plate; 5. Tail buckle; 7. Code disk; 8. Screw tube. DETAILED DESCRIPTION

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which the present invention belongs; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. Reference to "embodiments" herein means that specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0025] As described in the background technology, in the working environment of a medical electron linear accelerator, the aperture motor is usually located close to the radiation source, which causes the photoelectric encoder to be in a high-dose radiation environment for a long time. Radiation has a significant impact on the performance of electronic components such as photoelectric couplers. Long-term exposure to a radiation environment will cause the performance of the photoelectric coupler to deteriorate, manifested as reduced sensitivity, aggravated pulse loss, etc. These problems will directly affect the measurement accuracy of the motor speed by the photoelectric encoder, and then affect the precise control of the aperture movement speed, increase the risk of errors during the treatment process, and may even pose a threat to the patient's treatment effect and safety.

[0026] In order to solve this technical problem, the utility model provides a photoelectric encoder in a high radiation environment, which is applied to the measurement of the rotation speed of an aperture motor.

[0027] Specifically, please refer to Figure 1-Figure 4 , photoelectric encoders in high radiation environments specifically include:

[0028] The code disc 7 and the reflective fiber amplifier assembly, the code disc 7 is used to be installed on the motor output shaft, the reflective fiber amplifier assembly includes a fiber amplifier 1, an optical fiber line 2 and an optical fiber head body 3, the optical fiber head body 3 is located on one side of the code disc 7, one end of the optical fiber line 2 is fixed to the optical fiber head body 3, and the other end is connected to the fiber amplifier 1, and the optical fiber amplifier 1 is used to be installed in a radiation shielding position.

[0029] The utility model provides a photoelectric encoder for a high-radiation environment. The present application adopts an optical fiber line 2 to transmit an optical signal, and utilizes the high radiation resistance of the optical fiber to ensure that it can still work stably in a high-dose radiation environment and avoid performance degradation. The optical fiber head body 3 is connected to the optical fiber amplifier 1 through the optical fiber line 2, so that the optical fiber amplifier 1 can be installed in a radiation shielding position, avoiding direct exposure to the radiation environment, reducing radiation damage, and thus extending the service life of the equipment.

[0030] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0031] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0032] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0033] Embodiment 1 of the photoelectric encoder in a high radiation environment of the utility model

[0034] Please refer to Figure 1-Figure 4 The photoelectric encoder for high radiation environment of the utility model includes: a code disk 7 and a reflective fiber amplifier assembly. The code disk 7 is used to be installed on the output shaft of the motor. The reflective fiber amplifier assembly includes a fiber amplifier 1, a fiber line 2 and a fiber head body 3. The fiber head body 3 is located on one side of the code disk 7. One end of the fiber line 2 is fixed on the fiber head body 3, and the other end is connected to the fiber amplifier 1. The fiber amplifier 1 is used to be installed in a radiation shielding position. The fiber amplifier 1 is installed in the radiation shielding position. This design can greatly weaken the adverse effects of radiation on the performance of the fiber amplifier 1. Through effective shielding, the performance degradation and failure probability of electronic components caused by radiation are reduced, and even damage to components is avoided. This measure significantly improves the stable operation capability of the equipment in a high radiation environment, ensures the accuracy and reliability of signal transmission and processing, and provides a strong guarantee for the continuous and stable operation of the entire system.

[0035] Further, such as Figure 2 As shown, the code disk 7 is located on the tail end of the motor output shaft and rotates with the motor output shaft. This design can directly and accurately reflect the real-time rotation state of the motor output shaft, with almost no transmission error and signal delay, thereby significantly improving the measurement precision and accuracy. Secondly, due to its close connection with the output shaft, it can timely sense and transmit subtle speed changes, providing the system with high-sensitivity speed monitoring.

[0036] Furthermore, the code disc 7 is made of radiation-resistant materials. The use of radiation-resistant materials to make the code disc 7 brings many significant benefits. It greatly enhances the structural stability and chemical stability of the code disc 7 in a high radiation environment, making it less likely to deform, become brittle or degrade in performance. Secondly, it effectively prolongs the service life of the code disc 7 and reduces the frequent replacement and maintenance costs caused by radiation damage. Furthermore, the good radiation protection performance ensures that the code disc 7 can accurately perform the shading and light transmission functions, providing a stable foundation for the generation and transmission of optical signals.

[0037] Radiation resistant materials can be:

[0038] Lead: Lead is one of the most commonly used materials for radiation protection, with good protection performance, stability and durability;

[0039] Polytetrafluoroethylene (PTFE), polyimide (PI): These polymer materials have good heat resistance and corrosion resistance, and their electromagnetic shielding effectiveness can be improved by adding conductive fillers such as carbon black, metal nanoparticles, etc., thereby enhancing the radiation protection ability to a certain extent.

[0040] Embodiment 2 of the photoelectric encoder in a high radiation environment of the utility model

[0041] The photoelectric encoder for a high radiation environment of the utility model further has a mounting part connected between the fiber head body 3 and the motor, and the mounting part is arranged at the tail of the motor. The fiber head body 3 is installed at the tail of the motor through the mounting part. This design not only significantly enhances the installation stability of the fiber head body 3, but also effectively reduces the position deviation caused by factors such as vibration generated when the motor is working, thereby ensuring that the fiber head body 3 can always maintain an accurate alignment position, greatly improving the accuracy and stability of the measurement, and providing a solid foundation for the reliable operation of the system.

[0042] Further, such as Figure 1-Figure 4 As shown, the mounting part includes a tail buckle 5 installed on the tail of the motor, and a fiber optic head fixing plate 4 is provided on the tail buckle 5. The fiber optic head body 3 is fixed on the fiber optic head fixing plate 4, which provides an extremely reliable and stable fixing method for the fiber optic head body 3, ensuring that it can maintain a fixed position and posture under various working conditions.

[0043] Further, such as Figure 2 As shown, screw tubes 8 are fixedly connected to both sides of the tail buckle 5, and the screw tubes 8 are connected to the optical fiber head fixing plate 4 by bolts.

[0044] Furthermore, a U-shaped groove is provided on the tail buckle 5 between the two screw tubes 8 to adjust the distance between the fiber head fixing plate 4 and the code disk 7, thereby increasing the difference in light intensity received by the fiber amplifier 1 when the code disk 7 blocks light and transmits light, and making the pulse output more stable. After unscrewing the bolt, the tail buckle 5 can be moved to adjust the position of the tail buckle 5. After adjustment, the bolt is tightened again, so that the tail buckle 5 and the fiber head fixing plate 4 are clamped at the tail of the motor under the action of the bolt.

[0045] Furthermore, the optical fiber head fixing plate 4 is provided with mounting holes for the optical fiber head main body 3. If the light encounters an obstacle during transmission, reflection, refraction and absorption will occur, resulting in weakening and distortion of the intensity of the optical signal. The existence of the mounting holes prevents the optical fiber head fixing plate 4 from causing unnecessary interference to the light, thereby ensuring that the light can be accurately and completely transmitted from the optical fiber head main body 3 to the code disk 7, and smoothly returned for detection.

[0046] Embodiment 3 of the photoelectric encoder in a high radiation environment of the utility model

[0047] The photoelectric encoder for a high radiation environment of the utility model further has two optical fiber lines 2, one of which is used to transmit the light emitted by the optical fiber amplifier 1, and the other is used to transmit the reflected light. Two independent optical fiber lines 2 are used to transmit the emitted and reflected light respectively. This design effectively avoids mutual interference and confusion between signals, and ensures that the emitted light and the reflected light can be transmitted independently and purely by separating the transmission paths, thereby reducing signal distortion and attenuation. This not only significantly improves the signal quality and transmission efficiency, but also enhances the anti-interference ability of the system, making the measurement results more accurate and reliable.

[0048] Furthermore, the optical fiber head body 3 adopts a reflective optical fiber head, and the optical fiber head body 3 is used to transmit the light emitted by the optical fiber amplifier 1 to the code disk 7 through the optical fiber line 2, and receive the light reflected by the code disk 7 and transmit it back to the optical fiber amplifier 1 for light intensity detection, thereby converting it into a pulse signal. The reflective optical fiber head has higher optical efficiency and sensitivity, and can capture and transmit light more accurately, thereby improving the accuracy and resolution of light intensity detection. Secondly, its good directionality and focusing performance enable the light to be more concentratedly irradiated onto the code disk 7, and accurately receive the reflected light, reducing the loss and scattering of light, which helps to generate clearer and more stable pulse signals, thereby more accurately reflecting the speed changes of the motor.

[0049] For ease of understanding, this application uses A to represent the motor whose speed needs to be measured, and Figure 1 The optical fiber head body 3 is aligned with the code disk 7, and the optical fiber amplifier 1 transmits the emitted light to the code disk 7 through an optical fiber line 2. When the motor rotates, the reflected light intensity changes due to the shielding and transmission of the code disk 7, and then the reflected light is transmitted back to the optical fiber amplifier 1 through another optical fiber line 2. The optical fiber amplifier 1 converts the light intensity signal into a pulse signal to achieve the purpose of measuring the motor speed.

[0050] Obviously, the embodiments described above are only some embodiments of the utility model, rather than all embodiments. The preferred embodiments of the utility model are given in the accompanying drawings, but they do not limit the patent scope of the utility model. The utility model can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the utility model specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the utility model.

Claims

1. A photoelectric encoder in a high radiation environment, characterized in that: include: A code disc (7) and a reflective optical fiber amplifier assembly, wherein the code disc (7) is used to be mounted on a motor output shaft, and the reflective optical fiber amplifier assembly comprises an optical fiber amplifier (1), an optical fiber line (2) and an optical fiber head body (3), wherein the optical fiber head body (3) is located on one side of the code disc (7), one end of the optical fiber line (2) is fixed to the optical fiber head body (3), and the other end is connected to the optical fiber amplifier (1), and the optical fiber amplifier (1) is used to be mounted at a radiation shielding position.

2. The photoelectric encoder for high radiation environment according to claim 1, characterized in that: The code disc (7) is located on the tail end of the motor output shaft and rotates along with the motor output shaft.

3. The photoelectric encoder for high radiation environment according to claim 1, characterized in that: A mounting piece is connected between the optical fiber head body (3) and the motor, and the mounting piece is arranged at the tail of the motor.

4. The photoelectric encoder for high radiation environment according to claim 3, characterized in that: The mounting member comprises a tail buckle (5) mounted on the tail of the motor, an optical fiber head fixing plate (4) is arranged on the tail buckle (5), and the optical fiber head body (3) is fixed on the optical fiber head fixing plate (4).

5. The photoelectric encoder for high radiation environment according to claim 4, characterized in that: Screw tubes (8) are fixedly connected to both sides of the tail buckle (5), and the screw tubes (8) are connected to the optical fiber head fixing plate (4) via bolts.

6. The photoelectric encoder for high radiation environment according to claim 5, characterized in that: The tail buckle (5) is provided with a U-shaped groove located between the two screw tubes (8) to adjust the distance between the optical fiber head fixing plate (4) and the code disk (7).

7. The photoelectric encoder for high radiation environment according to claim 4, characterized in that: The optical fiber head fixing plate (4) is provided with mounting holes for the optical fiber head body (3).

8. The photoelectric encoder for high radiation environment according to claim 1, characterized in that: The number of the optical fiber lines (2) is two, one of the optical fiber lines (2) is used to transmit the light emitted by the optical fiber amplifier (1), and the other optical fiber line (2) is used to transmit the reflected light.

9. The photoelectric encoder for high radiation environment according to claim 1, characterized in that: The optical fiber head body (3) is a reflective optical fiber head, and the optical fiber head body (3) is used to transmit the light emitted by the optical fiber amplifier (1) to the code disk (7) through the optical fiber line (2), and receive the light reflected by the code disk (7) and transmit it back to the optical fiber amplifier (1) for light intensity detection.

10. The photoelectric encoder for high radiation environment according to claim 1, characterized in that: The code disc (7) is made of radiation-resistant material.

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