Light source focusing lens system of schlieren instrument

Abstract

The utility model relates to a schlieren instrument light source focusing lens system, which comprises a lens shell, heat insulation glass, a front side lens group and a rear side lens group, and is technically characterized in that a lens carrier is arranged on the periphery of the front side lens group, a plurality of permanent magnets are uniformly arranged on the periphery of the lens carrier, and a front coil assembly is arranged in the front side wall of the lens shell; a rear coil assembly is arranged in the rear side wall of the lens shell, a plurality of guide holes are evenly formed in the periphery of the lens carrier, hollow guide rods are arranged in the guide holes, an annular cooling medium shunting cavity is embedded in the outer surface of the front side wall of the lens shell, and an annular cooling medium converging cavity is embedded in the outer surface of the rear side wall of the lens shell. One end of the hollow guide rod is communicated with the annular cooling medium shunting cavity, and the other end is communicated with the annular cooling medium converging cavity. The system eliminates the influence of heat generated by an electromagnetic driving element, guarantees the working stability, and facilitates the adjustment of the position of the system between the light source and the slit.

Description

Technical Field

[0001] The utility model relates to the technical field of schlieren instruments, in particular to a schlieren instrument light source focusing lens system. Background Art

[0002] Schlieren instrument is used for Schlieren experiment, that is, it is an optical display instrument used to observe the density change inside transparent medium. Schlieren instrument usually includes a light source slit focusing system, two sets of schlieren primary mirror systems, and a knife-edge imaging system. Among them, the light source slit focusing system makes the light source imaged to the slit through the focusing mirror, and the slit is used as a point light source.

[0003] For example, CN 215449739 U discloses a schlieren light source focusing lens system, which includes heat-insulating glass, a front lens group with positive focal length, and a rear lens group with positive focal length arranged in sequence along the incident direction of light, wherein the front lens group is formed by gluing a convex-concave lens arranged at the front and a biconvex lens arranged at the rear, and the rear lens group is formed by gluing a biconvex lens arranged at the front and a concave-convex lens arranged at the rear. This system increases the lens aperture and is conducive to heat dissipation. However, the following problems still exist: the spacing between the front lens group and the rear lens group should be adjusted according to the test requirements. Such a design requires the configuration of an electromagnetic drive element, which generates heat during operation and is transmitted to the lens group, affecting the working stability. Utility Model Content

[0004] The purpose of the utility model is to provide a schlieren instrument light source focusing lens system that solves the above-mentioned problem, eliminates the heat influence generated by the electromagnetic drive element, ensures working stability, and at the same time, facilitates adjustment of the position of the system between the light source and the slit.

[0005] The technical solution of the utility model is:

[0006] A schlieren light source focusing lens system comprises a lens housing, a light incident port arranged on the front side wall of the lens housing, a light exit port arranged on the rear side wall of the lens housing, a heat-insulating glass arranged at the light incident port, a rear lens group arranged at the light exit port, and a front lens group arranged in the lens housing. The technical key points are: a lens carrier is arranged on the periphery of the front lens group, a plurality of axial through holes arranged around the optical axis are evenly arranged on the periphery of the lens carrier, a permanent magnet is arranged in the axial through hole, a front slot body corresponding to the axial through holes is arranged on the inner surface of the front side wall of the lens housing, a front coil assembly is arranged in the front slot body, and the front coil assembly is arranged in the front slot body. The inner surface of the rear side wall of the lens housing is provided with a rear groove body corresponding to the axial through hole one by one, and a rear coil assembly is provided in the rear groove body. A plurality of guide holes are evenly provided on the periphery of the lens carrier, and a hollow guide rod parallel to the optical axis is provided in the guide hole. An annular cooling medium diversion cavity is inlaid on the outer surface of the front side wall of the lens housing, and an annular cooling medium confluence cavity is inlaid on the outer surface of the rear side wall of the lens housing. One end of the hollow guide rod is connected to the annular cooling medium diversion cavity, and the other end is connected to the annular cooling medium confluence cavity. The annular cooling medium diversion cavity is provided with a cooling medium inlet, and the annular cooling medium confluence cavity is provided with a cooling medium outlet.

[0007] In the above-mentioned schlieren light source focusing lens system, a wear-resistant sleeve is provided between the guide hole and the hollow guide rod to prevent wear from affecting the guiding accuracy.

[0008] In the above-mentioned schlieren instrument light source focusing lens system, a damping layer is provided on the inner peripheral wall of the lens housing, and the outer peripheral wall of the lens carrier is in contact with the damping layer.

[0009] The above-mentioned schlieren light source focusing lens system also includes a right-angle support, and the upper surface of the horizontal section of the right-angle support is provided with a horizontal guide rail parallel to the optical axis, a slider is fixed to the bottom surface of the lens housing, and the bottom surface of the slider is provided with a slide groove matching the horizontal guide rail, a lead screw parallel to the horizontal guide rail is supported between the front and rear ends of the horizontal section, and a nut matching the lead screw is provided on the slider, an optical rod parallel to the horizontal guide rail is fixed between the front and rear ends of the vertical section of the right-angle support, and a guide ear is provided on the outer wall of the lens housing, and a guide sleeve matching the optical rod is provided on the guide ear.

[0010] In the above-mentioned schlieren light source focusing lens system, a rotating handle is fixed to one end of the lead screw.

[0011] The beneficial effects of the utility model are:

[0012] 1. When the front coil assembly and the rear coil assembly are energized, opposite forces are generated, causing one coil assembly to attract the permanent magnet while the other coil assembly repels the permanent magnet, thereby causing the lens carrier to drive the front lens group to move toward the rear lens group or in the opposite direction, thereby achieving the purpose of adjusting the distance between the two lens groups.

[0013] 2. During operation, since the front coil assembly and the rear coil assembly generate heat when energized, cooling medium is injected into the annular cooling medium diversion cavity, and then transmitted to the annular cooling medium confluence cavity through each hollow guide rod. The cooling medium is circulated to take away the heat in the system, thereby ensuring the working stability of the two lens groups.

[0014] 3. The lead screw on the right-angle support is used to drive the nut to move, thereby driving the lens housing to move along the horizontal guide rail, so as to facilitate the adjustment of the position of the system between the light source and the slit to meet the test requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 yes Figure 1 Side view of.

[0017] In the figure: 1. vertical section, 2. light rod, 3. insulating glass, 4. cooling medium inlet, 5. annular cooling medium diversion chamber, 6. lens housing, 7. front coil assembly, 8. wear-resistant sleeve, 9. hollow guide rod, 10 lens carrier, 11. permanent magnet, 12. damping layer, 13. rear coil assembly, 14. annular cooling medium confluence chamber, 15. rear lens group, 16. rotating handle, 17. horizontal section, 18. horizontal guide rail, 19. lead screw, 20. slider, 21. front lens group, 22. guide ear, 23. cooling medium outlet. DETAILED DESCRIPTION

[0018] The utility model is described in detail according to the accompanying drawings of the specification.

[0019] like Figure 1 , Figure 2 As shown, the schlieren instrument light source focusing lens system includes a lens housing 6, a light incident port arranged on the front side wall of the lens housing 6, a light outlet arranged on the rear side wall of the lens housing 6, a heat-insulating glass 3 arranged at the light incident port, a rear lens group 15 arranged at the light outlet, and a front lens group 21 arranged in the lens housing 6.

[0020] Among them, a lens carrier 10 is provided on the outer periphery of the front lens group 21, and four axial through holes arranged around the optical axis are evenly provided on the outer periphery of the lens carrier 10, and a permanent magnet 11 is provided in the axial through hole. The inner surface of the front side wall of the lens housing 6 is provided with a front groove body corresponding to the axial through holes one by one, and the front coil assembly 7 is provided in the front groove body. The inner surface of the rear side wall of the lens housing 6 is provided with a rear groove body corresponding to the axial through holes one by one, and the rear coil assembly 13 is provided in the rear groove body.

[0021] The outer circumference of the lens carrier 10 is evenly provided with 4 guide holes, and a hollow guide rod 9 parallel to the optical axis is provided in the guide hole. The outer surface of the front side wall of the lens housing 6 is inlaid with an annular cooling medium diversion cavity 5, and the outer surface of the rear side wall of the lens housing 6 is inlaid with an annular cooling medium confluence cavity 14. One end of the hollow guide rod 9 is connected to the annular cooling medium diversion cavity 5, and the other end is connected to the annular cooling medium confluence cavity 14. The annular cooling medium diversion cavity 5 is provided with a cooling medium inlet 4, and the annular cooling medium confluence cavity 14 is provided with a cooling medium outlet 23. In this embodiment, a wear-resistant sleeve 8 is provided between the guide hole and the hollow guide rod 9 to prevent wear from affecting the guiding accuracy. A damping layer 12 is provided on the inner circumferential wall of the lens housing 6, and the outer circumferential wall of the lens carrier 10 is in contact with the damping layer 12.

[0022] The system also includes a right-angle support, the upper surface of the horizontal section 17 of the right-angle support is provided with a horizontal guide rail 18 parallel to the optical axis, a slider 20 is fixed to the bottom surface of the lens housing 6, the bottom surface of the slider 20 is provided with a slide groove matched with the horizontal guide rail 18, a lead screw 19 parallel to the horizontal guide rail 18 is supported between the front and rear ends of the horizontal section 17, a nut matched with the lead screw 19 is provided on the slider 20, an optical rod 2 parallel to the horizontal guide rail 18 is fixed between the front and rear ends of the vertical section 1 of the right-angle support, a guide ear 22 is provided on the outer wall of the lens housing 6, and a guide sleeve matched with the optical rod 2 is provided on the guide ear 22. A rotating handle 16 is fixed to one end of the lead screw 19.

[0023] Working principle:

[0024] When current is passed through the front and rear coil assemblies 7 and 13, the front coil assembly 7 and the permanent magnet 11 generate an attractive force, and the rear coil assembly 13 and the permanent magnet 11 generate a repulsive force, so that the front lens group 21 moves along the hollow guide rod 9 away from the rear lens group 15. When a reverse current is charged, the front lens group 21 moves along the hollow guide rod 9 toward the rear lens group 15, thereby achieving the purpose of adjusting the distance between the front and rear lens groups. In this process, the damping layer 12 ensures the stability of the movement of the lens carrier 10.

[0025] The cooling medium is injected into the annular cooling medium diversion chamber 5, and then transmitted to the annular cooling medium confluence chamber 14 through each hollow guide rod 9. The cooling medium is circulated to take away the heat generated by the front and rear coil assemblies 7 and 13, thereby preventing the front and rear lens groups 21 and 15 from being affected by the heat and affecting their working stability.

[0026] When the horizontal position of the entire system needs to be adjusted, the rotary handle 16 is rotated to drive the entire lens housing 6 to move forward or backward along the horizontal guide rail 18, thereby achieving the purpose of adjusting the position of the system between the light source and the slit.

[0027] The above is a detailed description of the embodiments of the utility model, but the above contents are only preferred embodiments of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of the invention of the utility model should still fall within the scope of this patent.

Claims

1. A schlieren light source focusing lens system, comprising a lens housing, a light incident port arranged on the front side wall of the lens housing, a light exit port arranged on the rear side wall of the lens housing, a heat-insulating glass arranged at the light incident port, a rear lens group arranged at the light exit port, and a front lens group arranged in the lens housing, characterized in that: A lens carrier is provided on the periphery of the front lens group, and a plurality of axial through holes arranged around the optical axis are evenly provided on the periphery of the lens carrier, and a permanent magnet is provided in the axial through hole, and a front slot body corresponding to the axial through hole is provided on the inner surface of the front side wall of the lens housing, and a front coil assembly is provided in the front slot body, and a rear slot body corresponding to the axial through hole is provided on the inner surface of the rear side wall of the lens housing, and a rear coil assembly is provided in the rear slot body, and a plurality of guide holes are evenly provided on the periphery of the lens carrier, and a hollow guide rod parallel to the optical axis is provided in the guide hole, an annular cooling medium diversion cavity is inlaid on the outer surface of the front side wall of the lens housing, and an annular cooling medium confluence cavity is inlaid on the outer surface of the rear side wall of the lens housing, one end of the hollow guide rod is connected with the annular cooling medium diversion cavity, and the other end is connected with the annular cooling medium confluence cavity, the annular cooling medium diversion cavity is provided with a cooling medium inlet, and the annular cooling medium confluence cavity is provided with a cooling medium outlet.

2. The schlieren light source focusing lens system according to claim 1, characterized in that: A wear-resistant sleeve is arranged between the guide hole and the hollow guide rod.

3. The schlieren light source focusing lens system according to claim 1, characterized in that: A damping layer is arranged on the inner peripheral wall of the lens housing, and the outer peripheral wall of the lens carrier is in contact with the damping layer.

4. The schlieren light source focusing lens system according to claim 1, characterized in that: It also includes a right-angle support, wherein the upper surface of the horizontal section of the right-angle support is provided with a horizontal guide rail parallel to the optical axis, a slider is fixed to the bottom surface of the lens housing, and the bottom surface of the slider is provided with a slide groove matching the horizontal guide rail, a lead screw parallel to the horizontal guide rail is supported between the front and rear ends of the horizontal section, a nut matching the lead screw is provided on the slider, an optical rod parallel to the horizontal guide rail is fixed between the front and rear ends of the vertical section of the right-angle support, a guide ear is provided on the outer wall of the lens housing, and a guide sleeve matching the optical rod is provided on the guide ear.

5. The schlieren light source focusing lens system according to claim 4, characterized in that: A rotating handle is fixed at one end of the lead screw.

Images