A type of linear laser source light guide arm
By combining the multi-joint light guide arm with the shaping component, high-degree-of-freedom transmission and homogenization of the laser beam are achieved, solving the problems of low energy utilization and insufficient beam uniformity of existing light guide arms, expanding the detection range and maintaining energy efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 北京镭志威光电技术有限公司
- Filing Date
- 2025-09-23
- Publication Date
- 2026-07-03
AI Technical Summary
Existing light guide arm products have reduced energy utilization, difficulty in eliminating beam center hotspots, poor system stability, and limited freedom of movement, making them difficult to adapt to the spatial requirements of complex detection environments.
The laser beam is shaped into a straight line by combining a multi-jointed light guide arm with a shaping component. The laser beam is transmitted through the multi-jointed light guide arm and homogenized by a Powell prism. High reflectivity coating technology is used to reduce energy loss.
It achieves high-degree-of-freedom transmission and homogenization of the laser beam, expands the detection range, improves the degree of freedom of movement of the light guide arm and the uniformity of the laser beam, maintains energy efficiency, and solves the problems of low energy utilization and insufficient beam uniformity of traditional light guide arms.
Smart Images
Figure CN224456773U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of laser equipment technology, specifically to a linear laser source light guide arm. Background Technology
[0002] 532nm PIV lasers, as fundamental equipment for fluid velocity measurement, are widely used in wind tunnel experiments, smoke particle tracking, and dust motion analysis. Current optical guide arm systems face two major technical bottlenecks: first, limited joint freedom of movement leads to insufficient laser positioning accuracy, making it difficult to adapt to the spatial requirements of complex detection environments; second, conventional circular Gaussian beams exhibit a central energy concentration effect, with significant intensity attenuation at the edges, directly reducing the effective coverage of the detection area.
[0003] While existing light guide arm products have proposed some improvement methods, such as increasing the number of reflectors to improve light guiding flexibility, the increased optical path loss leads to a decrease in energy utilization. Furthermore, the use of ordinary cylindrical mirrors for beam expansion makes it difficult to eliminate hot spots at the center of the beam, resulting in poor system stability.
[0004] To address this, we propose a linear laser source light guide arm. Utility Model Content
[0005] This application provides a linear laser source light guide arm to at least solve the problems of reduced energy utilization, difficulty in eliminating beam center hot spots, and poor system stability in existing light guide arm products.
[0006] This application provides a linear laser source light guide arm, including a base and a laser source disposed within the base, and further comprising:
[0007] A multi-joint light guide arm, which has multiple joints and an internal through first optical path to transmit the emitted laser from the laser source, and its first end is vertically movably mounted on the upper end of the base.
[0008] The shaping component, which has a through second optical path inside and is assembled at the second end of the multi-jointed light guide arm, shapes the emitted laser into a line-shaped laser. Its interior includes at least: a plano-concave lens, a first plano-convex lens, a second plano-convex lens and a Powell prism arranged sequentially on the second optical path.
[0009] Optionally, the multi-jointed light guide arm includes:
[0010] The first joint arm has its first end fixedly assembled to the upper end of the base;
[0011] The first end of the second articulated arm is movably connected to the second end of the first articulated arm via a first articulated component.
[0012] The first end of the third articulated arm is movably connected to the second end of the second articulated arm via a second articulated member;
[0013] The third joint component is movably assembled between the second end of the third joint arm and the shaping component;
[0014] The first joint arm, the first joint component, the second joint arm, the second joint component, the third joint arm, and the third joint component are all internally connected. The first joint component is provided with a first reflector and a second reflector, the second joint component is provided with a third reflector and a fourth reflector, and the third joint component is provided with a fifth reflector, a sixth reflector, and a seventh reflector, so as to transmit the emitted laser to the plano-concave lens through the first optical path.
[0015] Optionally, the base may also be provided with an eighth reflecting mirror that reflects the emitted laser from the laser source into the first optical path.
[0016] Optionally, the first joint is provided with a counterweight for balancing the moving posture of the multi-joint light guide arm.
[0017] Optionally, the first joint member is further provided with two limiting posts symmetrically distributed on both sides of the first joint arm to limit the movement angle of the second joint arm.
[0018] Optionally, the laser source is a 532nm collimated laser with a divergence angle of less than 1.2mrad.
[0019] Optionally, the first, second, third, fourth, fifth, sixth, seventh, and eighth reflectors are all coated with a 532nm HR film.
[0020] Optionally, the plano-concave lens, the first plano-convex lens, the second plano-convex lens, and the Powell prism are all coated with a 532nm HT film.
[0021] Compared with related technologies, the linear laser source light guide arm provided in this application has at least the following technical advantages:
[0022] Through the synergistic effect of the multi-jointed light guide arm and the shaping component, the laser beam achieves high degree of freedom of transmission and uniform shaping. The beam light source is uniform in intensity by the Powell prism and shaped into a fan-shaped linear light source for emission. While maintaining energy efficiency, the detection range is expanded. This solves the problems of limited movement of traditional light guide arms, insufficient beam uniformity and small detection range. It has the advantages of improving the degree of freedom of movement of the light guide arm and the uniformity of the laser beam.
[0023] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. Attached Figure Description
[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0025] Figure 1 This is a three-dimensional structural diagram of a linear laser source light guide arm according to an exemplary embodiment.
[0026] Figure 2 This is an optical path diagram of a line laser source light guide arm according to an exemplary embodiment. Detailed Implementation
[0027] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," "third," "fourth," "fifth," "sixth," "seventh," and "eighth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0030] In related technologies, existing light guide arm products have also proposed some improvement methods, such as increasing the number of reflectors to improve the flexibility of light guiding. However, the increased optical path loss will lead to a decrease in energy utilization. In addition, the use of ordinary cylindrical mirrors for beam expansion makes it difficult to eliminate the hot spot at the center of the beam, resulting in poor system stability.
[0031] Based on the above, this utility model provides a linear laser source light guide arm, which will be described in detail below with reference to specific embodiments and accompanying drawings.
[0032] Example 1
[0033] This utility model embodiment provides a linear laser source light guide arm. Figure 1 This is a three-dimensional structural diagram of a linear laser source light guide arm according to an exemplary embodiment. Figure 2 This is an optical path diagram of a single-line laser source light guide arm according to an exemplary embodiment. For example... Figure 1-2 As shown, the linear laser source light guide arm includes a base 10 and a laser source 101 disposed within the base 10, and further includes:
[0034] The multi-joint light guide arm 20 has multiple joints and an internal through first optical path to transmit the emitted laser from the laser source 101, and its first end is vertically movably mounted on the upper end of the base 10.
[0035] The shaping component 30, which has a through second optical path and is assembled at the second end of the multi-jointed light guide arm 20, shapes the emitted laser beam into a line-shaped laser. It includes at least the following components arranged sequentially on the second optical path: a plano-concave lens 301, a first plano-convex lens 302, a second plano-convex lens 303, and a Powell prism 304. In this embodiment, the plano-concave lens 301 is a negative focal length lens with a diameter of 12.7 mm and a focal length f1 of 20 mm, used for preprocessing the diverging laser beam. The first plano-convex lens 302 and the second plano-convex lens 303 are positive focal length lenses, both with a diameter of 25.4 mm and focal lengths f2 and f3 of 100 mm, used for collimating the beam. The Powell prism 304, with a diameter of 25.4 mm, is used for homogenizing and linearly diffusing the beam. After being shaped by the shaping component 30, the incident laser beam is converted into a uniform line-shaped emission.
[0036] The multi-joint light guide arm 20 includes:
[0037] The first articulated arm 201 has its first end fixedly assembled to the upper end of the base 10;
[0038] The first end of the second articulated arm 203 is movably connected to the second end of the first articulated arm 20 via the first articulated member 202;
[0039] The first end of the third articulated arm 205 is movably connected to the second end of the second articulated arm 203 via the second articulated member 204;
[0040] The third joint component 206 is movably assembled between the second end of the third joint arm 205 and the shaping component 30;
[0041] The first joint arm 201, the first joint component 202, the second joint arm 203, the second joint component 204, the third joint arm 205, and the third joint component 206 are all internally connected. The first joint component 202 is equipped with a first reflector 601 and a second reflector 602, the second joint component 204 is equipped with a third reflector 603 and a fourth reflector 604, and the third joint component 206 is equipped with a fifth reflector 605, a sixth reflector 606, and a seventh reflector 607. This allows the emitted laser beam to be transmitted to the plano-concave lens 901 via the first optical path, thereby maintaining the continuity of the optical path while expanding the spatial degrees of freedom of the multi-joint light guide arm 20. The first joint component 202, the second joint component 204, and the third joint component 206 can all be implemented using a rotating shaft and bearing structure. Furthermore, the movable connection structure allows each joint arm to move independently in the pitch, deflection, and rotation directions, forming a composite degree of freedom adjustment capability, ensuring that the laser beam is always transmitted along the preset optical path during the joint movement.
[0042] The base 10 is also provided with an eighth reflector 102 that reflects the emitted laser from the laser source 101 into the first optical path.
[0043] In the above embodiment, the emitted laser generated by the laser source 101 is reflected by the eighth reflector 102 into the first optical path within the multi-joint light guide arm 20. The multi-joint light guide arm 20 maintains optical path continuity even when adjusted at multiple angles in space. Subsequently, after the laser beam is transmitted to the shaping component 30 via the multi-joint light guide arm 20, it is first diverged by the plano-concave lens 301 to reduce the beam energy density. Then, it is focused twice by the first plano-convex lens 302 and the second plano-convex lens 303 to form a collimated beam, eliminating optical path offset. Finally, the Powell prism 304 diffuses the beam in one dimension, eliminating the central hot spot through edge ray redistribution, forming a straight line output. This solves the problem of insufficient freedom of movement of existing light guide arms, and realizes the efficient conversion of the laser beam from Gaussian distribution to a uniform straight line, eliminating the central hot spot of the beam, expanding the detection coverage, and reducing energy loss during optical path transmission.
[0044] In this embodiment, we continue to refer to Figure 1The first joint 202 is provided with a counterweight 40 for balancing the movement posture of the multi-joint light guide arm 20. Further, the counterweight 40 is fixed to the outside of the first joint in a detachable manner, and its mass matches the center of gravity offset of the multi-joint light guide arm 20, so as to generate a reverse torque to counteract the effect of gravity when the joint moves. The first joint 202 is also provided with two limiting posts 50 symmetrically distributed on both sides of the first joint arm 201 to limit the movement angle of the second joint arm 203. Further, the limiting posts 50 can also be covered with a buffer layer to reduce rigid collisions.
[0045] In the above embodiment, during the spatial pose adjustment process of the multi-joint light guide arm 20, each joint arm generates overturning torques in different directions due to gravity, resulting in overall posture imbalance. The counterweight 40 increases the balancing mass at a specific position of the first joint 202, so that the resultant torque generated by the multi-joint light guide arm 20 during movement approaches zero. For example, when the second joint arm 203 tilts downward, the reverse torque generated by the counterweight 40 can offset its gravitational torque, preventing the first joint 201 from deflecting due to uneven force. Thus, the multi-joint light guide arm 20 can maintain static balance at any angle and can stably maintain the target pose without external force.
[0046] Meanwhile, when the second joint arm 203 deflects to any side to a preset angle, the preset end of its travel trajectory will be stopped by the corresponding limit post 50, thereby avoiding mechanical structure deformation caused by excessive rotation, and also helping to maintain the reference alignment state required for the optical path transmission of the light guide arm.
[0047] In this embodiment, we continue to refer to Figure 2 The laser source 101 is a 532nm collimated laser with a divergence angle of less than 1.2mrad. The divergence angle of less than 1.2mrad is the maximum divergence angle value of the laser beam during propagation. Specifically, it can be achieved by optimizing the resonant cavity structure of the laser source 101. Its emission angle data not only prevents the beam from diverging excessively, thus increasing the spot size, but also avoids placing excessively high requirements on the assembly accuracy of the light guide arm due to the divergence angle being too small. The first reflector 601, the second reflector 602, the third reflector 603, the fourth reflector 604, the fifth reflector 605, the sixth reflector 606, the seventh reflector 607, and the eighth reflector 102 are all coated with a 532nm HR film. The plano-concave lens 301, the first plano-convex lens 302, the second plano-convex lens 303, and the Powell prism 304 are all coated with a 532nm HT film.
[0048] In the above embodiment, the 532nm wavelength laser beam emitted from the laser source 101 passes through the multi-joint light guide arm 20 in sequence, passing through the eighth reflector 102, the first reflector 601, the second reflector 602, the third reflector 603, the fourth reflector 604, the fifth reflector 605, the sixth reflector 606, and the seventh reflector 607, and finally is transmitted to the plano-concave lens 901.
[0049] The 532nm HR film coated on the surfaces of the eight mirrors, plano-concave lens 301, first plano-convex lens 302, second plano-convex lens 303, and Powell prism 304 can reduce mirror absorption and scattering losses, keeping the light energy loss in each reflection process to within 1%. At the same time, the coating technology can increase the total reflection efficiency from about 85% for conventional mirrors to over 92% for eight reflections, thereby ensuring that the beam energy reaching the shaping component 30 meets the homogenization requirements. The 532nm HT film on the plano-concave lens 301, first plano-convex lens 302, second plano-convex lens 303, and Powell prism 304 can reduce the reflectivity of the lens surface, avoid energy loss, maintain the energy stability of the beam, improve energy utilization, and ultimately form a uniformly distributed line laser.
[0050] The above embodiments of this application can effectively suppress the light energy attenuation caused by multiple reflections inside the multi-joint light guide arm 20, so that the laser beam can still maintain high intensity output after transmission through a complex optical path, thereby solving the problem of low laser conversion efficiency caused by insufficient reflection efficiency in the prior art.
[0051] In summary, the linear laser source light guide arm provided in this embodiment of the present invention achieves high-degree-of-freedom transmission and uniform shaping of the laser beam through the synergistic effect of the multi-joint light guide arm and the shaping component. The beam-shaped light source achieves intensity uniformity through the Powell prism and is shaped into a fan-shaped linear light source for emission. While maintaining energy efficiency, it expands the detection range and solves the problems of limited movement, insufficient beam uniformity, and small detection range of traditional light guide arms. It has the advantages of improving the degree of freedom of movement of the light guide arm and the uniformity of the laser beam.
[0052] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. A linear laser source light guide arm comprising a base and a laser source disposed within the base, wherein, It also includes: A multi-joint light guide arm, which has multiple joints and an internal through first optical path to transmit the emitted laser from the laser source, and its first end is vertically movably mounted on the upper end of the base. The shaping component, which has a through second optical path inside and is assembled at the second end of the multi-jointed light guide arm, shapes the emitted laser into a line-shaped laser. Its interior includes at least: a plano-concave lens, a first plano-convex lens, a second plano-convex lens and a Powell prism arranged sequentially on the second optical path.
2. The laser source light guide arm of claim 1, wherein, The multi-joint light guide arm includes: The first joint arm has its first end fixedly assembled to the upper end of the base; The first end of the second articulated arm is movably connected to the second end of the first articulated arm via a first articulated component. The first end of the third articulated arm is movably connected to the second end of the second articulated arm via a second articulated member; The third joint component is movably assembled between the second end of the third joint arm and the shaping component; The first joint arm, the first joint component, the second joint arm, the second joint component, the third joint arm, and the third joint component are all internally connected. The first joint component is provided with a first reflector and a second reflector, the second joint component is provided with a third reflector and a fourth reflector, and the third joint component is provided with a fifth reflector, a sixth reflector, and a seventh reflector, so as to transmit the emitted laser to the plano-concave lens through the first optical path.
3. The laser source light guide arm of claim 2, wherein, The base is also equipped with an eighth reflecting mirror that reflects the emitted laser from the laser source into the first optical path.
4. The laser source light guide arm of claim 2, wherein, The first joint is provided with a counterweight for balancing the movement posture of the multi-joint light guide arm.
5. The laser source light guide arm of claim 2, wherein, The first joint component is also provided with two limiting posts symmetrically distributed on both sides of the first joint arm to limit the movement angle of the second joint arm.
6. The laser source light guide arm of claim 1, wherein, The laser source is a 532nm collimated laser with a divergence angle of less than 1.2mrad.
7. The laser source light guide arm of claim 3, wherein, The first, second, third, fourth, fifth, sixth, seventh, and eighth reflectors are all coated with a 532nm HR film.
8. The laser source light guide arm of claim 1, wherein, The plano-concave lens, the first plano-convex lens, the second plano-convex lens, and the Powell prism are all coated with a 532nm HT film.