Secondary vibration isolation device for upper angle prism of HCN laser interferometer
By designing a secondary vibration isolation device of the mounting frame, primary vibration isolation assembly and secondary vibration isolation assembly on the HCN laser interferometer, the problem of impact detection of pyramid prism vibration is solved, and better vibration isolation effect is achieved, ensuring the stability and safety of detection.
Patent Information
- Application Number
- CN202422350165.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-25
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-09-25
AI Technical Summary
The pyramid prism of the HCN laser interferometer is easily affected by vibration, resulting in unstable detection effect and may even cause accidents.
A secondary vibration isolation device including a mounting frame, a primary vibration isolation assembly and a secondary vibration isolation assembly is designed. Primary vibration reduction is performed through the primary vibration isolation assembly, and further vibration reduction is performed by the secondary vibration isolation assembly, and the transverse and longitudinal vibration isolation units are used to realize the transverse and longitudinal vibration isolation of the pyramid prism, respectively.
It effectively weakens the vibration effect of the pyramid prism, ensures the stability of the detection effect of the laser interferometer, and avoids inaccurate detection or accidents caused by vibration.
Smart Images
Figure CN223064563U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of laser interferometers, and particularly relates to a secondary vibration isolation device for an angle prism on an HCN laser interferometer. Background Art
[0002] An HCN (chemical formula of hydrocyanic acid) laser interferometer is an instrument that uses laser technology for interference measurement and is specifically used to detect the concentration of hydrogen cyanide in gases. Different from traditional optical interferometers, the HCN laser interferometer uses monochromatic laser generated by a laser light source for interference measurement, and has higher sensitivity and accuracy.
[0003] The working principle of an HCN laser interferometer is similar to that of other interferometers, but its light source is a laser. The laser emitted by the laser passes through an optical system and is focused into a parallel beam of light, and then is divided into two beams of light passing through an interference cavity. One beam of light passes through air or other gases, and the other beam of light passes through a gas containing HCN. The two beams of light interfere with each other in the interference cavity to form an interference pattern. The detector detects the intensity or phase difference of the interference signal and converts it into the HCN concentration. The HCN laser interferometer usually has advantages such as high resolution, fast response, and high sensitivity, and is suitable for environmental and industrial applications for real-time monitoring and precise control of the HCN concentration.
[0004] The optical system of an HCN laser interferometer includes a corner cube prism, which is a special optical element that can keep the reflected light beam parallel to the incident light beam regardless of the incident angle of the light. When the corner cube prism is vibrated, it is prone to beam deflection, which has an adverse impact on its measurement and rapid alignment, and may even cause serious accidents in severe cases. At present, there is little research on the vibration isolation technology for the corner cube prism on an HCN laser interferometer in China. Summary of the Utility Model
[0005] The purpose of the utility model is to overcome the deficiencies of the prior art, and provides a secondary vibration isolation device for an angle prism on an HCN laser interferometer, in order to achieve a better vibration isolation effect and avoid the detection effect of the laser interferometer being affected by the vibration of the corner cube prism.
[0006] The utility model is realized through the following technical solutions:
[0007] A secondary vibration isolation device for an upper corner prism of an HCN laser interferometer. A corner cube prism is provided on the corner cube mounting platform of the HCN laser interferometer. The corner cube prism is mounted on the corner cube mounting platform through a secondary vibration isolation device. The secondary vibration isolation device includes a mounting frame, a primary vibration isolation component, and a secondary vibration isolation component. The mounting frame is mounted on the corner cube mounting platform. The bottom end of the primary vibration isolation component is mounted on the mounting frame. The corner cube prism is mounted on the top end of the primary vibration isolation component through the secondary vibration isolation component. The corner cube prism includes an inner and outer corner cube prism body and a prism housing. The secondary vibration isolation component includes a prism protective cover and a group of lateral vibration isolation units and a group of longitudinal vibration isolation units provided on the prism protective cover. The bottom end of the prism protective cover is slidably provided on the top end of the primary vibration isolation component and can slide vertically. The prism protective cover is located outside the prism housing. The top end of the prism housing is mounted on the prism protective cover. The lateral vibration isolation and longitudinal vibration isolation of the corner cube prism are respectively realized through a group of lateral vibration isolation units and a group of longitudinal vibration isolation units.
[0008] As a preferred solution of the above device, the lateral vibration isolation unit includes a plurality of horizontal elastic members evenly distributed along the circumferential direction of the prism protective cover. The horizontal elastic members are mounted on the prism protective cover, and the direction of the elastic telescopic force of the horizontal elastic members extends along the radial direction of the prism housing. The inner ends of the plurality of horizontal elastic members are elastically pressed against the outer side wall of the prism housing respectively.
[0009] As a preferred solution of the above device, the longitudinal vibration isolation unit includes a plurality of vertical elastic members evenly distributed along the circumferential direction of the prism protective cover. The plurality of vertical elastic members are located inside the prism protective cover and outside the prism housing. The direction of the elastic telescopic force of the vertical elastic members is parallel to the axis of the prism housing. The top end of the vertical elastic member is connected to the prism protective cover, and the bottom end of the vertical elastic member is connected to the top end of the primary vibration isolation component.
[0010] As a preferred solution of the above device, the horizontal elastic member is a horizontal elastic plunger, and the horizontal elastic plunger is threadedly connected to the threaded hole of the prism protective cover.
[0011] As a preferred solution of the above device, the vertical elastic member is a helical compression spring with a vertical axis. A spring guide post protruding downward is provided at the bottom end of the prism protective cover. The upper end of the helical compression spring is fixedly sleeved on the spring guide post, and the lower end of the helical compression spring is fixedly connected to the vibration isolation upper plate.
[0012] As a preferred solution of the above device, a plurality of connection pins evenly distributed along the circumferential direction are provided at the top end of the primary vibration isolation component at the position corresponding to the prism protective cover. The connection pins extend upward in the vertical direction. A plurality of pin holes are opened at the bottom of the prism protective cover. The plurality of pin holes at the bottom of the prism protective cover are in sliding fit with the plurality of connection pins one by one.
[0013] As a preferred solution of the above device, the primary vibration isolation assembly includes a vibration isolation upper plate and a vibration isolation lower plate which are arranged oppositely up and down. The vibration isolation upper plate and the vibration isolation lower plate are connected by multiple groups of primary elastic members. The bottom end of the vibration isolation lower plate is installed on the mounting frame, and the bottom end of the prism protection cover is slidably arranged on the vibration isolation upper plate.
[0014] As a preferred solution of the above device, the primary elastic members adopt wire rope shock absorbers, and the upper and lower bases of the wire rope shock absorbers are respectively connected to the vibration isolation upper plate and the vibration isolation lower plate.
[0015] As a preferred solution of the above device, the vibration isolation lower plate is installed on the mounting frame through multiple groups of adjustable bolts.
[0016] As a preferred solution of the above device, perforations for the laser to pass through are provided at the corresponding positions of the mounting frame, the vibration isolation upper plate and the vibration isolation lower plate for the corner cube prism.
[0017] The utility model has the following advantages compared with the prior art:
[0018] A secondary vibration isolation device for a corner cube prism on an HCN laser interferometer provided by the utility model is provided with a primary vibration isolation assembly and a secondary vibration isolation assembly. The primary vibration isolation assembly plays a primary vibration reduction role, and the secondary vibration isolation assembly performs secondary vibration reduction on the impact after the primary vibration reduction, realizing vibration isolation for both longitudinal and transverse impacts, achieving a good vibration isolation effect on the corner cube prism, and avoiding the influence of the vibration of the corner cube prism on the detection effect of the laser interferometer. Description of the Drawings
[0019] Figure 1 is a perspective view of the utility model.
[0020] Figure 2 is a top view of the utility model.
[0021] Figure 3 is a perspective view of the secondary vibration isolation assembly of the utility model.
[0022] Reference numerals in the drawings: 1 corner cube prism; 2 mounting frame; 3 corner cube prism body; 4 prism housing; 5 prism protection cover body; 6 prism protection cover lid; 7 connecting pin; 8 vibration isolation upper plate; 9 vibration isolation lower plate; 10 wire rope shock absorber; 11 adjustable bolt; 12 nut; 13 perforation; 14 horizontal elastic plunger; 15 helical compression spring; 16 spring guide post. Detailed Embodiment
[0023] The embodiments of the utility model will be described in detail below. The following embodiments are implemented on the premise of the technical solution of the utility model, and detailed implementation manners and specific operation processes are given, but the protection scope of the utility model is not limited to the following embodiments.
[0024] See Figures 1 to 3 , this embodiment discloses a secondary vibration isolation device for an upper corner prism of an HCN laser interferometer. A corner cube prism 1 is provided on the corner cube mounting platform of the HCN laser interferometer. The corner cube prism 1 is mounted on the corner cube mounting platform through the secondary vibration isolation device. The secondary vibration isolation device includes a mounting frame 2, a primary vibration isolation component, and a secondary vibration isolation component. The mounting frame 2 is mounted on the corner cube mounting platform by means of screw connection.
[0025] The bottom end of the primary vibration isolation component is mounted on the mounting frame 2, and the corner cube prism 1 is mounted on the top end of the primary vibration isolation component through the secondary vibration isolation component. The corner cube prism 1 includes an inner and outer corner cube prism body 3 and a prism outer shell 4 in the shape of a cylinder. The secondary vibration isolation component includes a prism protective cover and a group of transverse vibration isolation units and a group of longitudinal vibration isolation units provided on the prism protective cover. The prism protective cover is located outside the prism outer shell 4. The top end of the prism outer shell 4 is mounted on the prism protective cover by means of screw connection. The transverse vibration isolation and longitudinal vibration isolation of the corner cube prism 1 are respectively realized through a group of transverse vibration isolation units and a group of longitudinal vibration isolation units. For the convenience of installation, the prism protective cover can be designed as a split structure composed of a prism protective cover body 5 and a prism protective cover lid 6. The prism protective cover lid 6 is fixedly connected to the top end of the prism protective cover body 5 by means of screw connection, and the top end of the prism outer shell 4 is fixed to the prism protective cover lid 6.
[0026] A plurality of connecting pins 7 evenly distributed in the circumferential direction are provided at the top end of the primary vibration isolation component at the corresponding position of the prism protective cover. The connecting pins 7 extend upward in the vertical direction. The bottom end of the prism protective cover is slidably arranged on the top end of the vibration isolation upper plate 8 of the primary vibration isolation component and can slide vertically. The specific sliding fit method is as follows: a plurality of pin holes are opened at the bottom of the prism protective cover, and the plurality of pin holes at the bottom of the prism protective cover are in sliding fit with the plurality of connecting pins 7 one by one.
[0027] The first-level vibration isolation assembly includes a vibration isolation upper plate 8 and a vibration isolation lower plate 9 which are arranged opposite to each other up and down. The vibration isolation upper plate 8 and the vibration isolation lower plate 9 are connected by multiple groups of first-level elastic members. The first-level elastic members can adopt wire rope shock absorbers 10. The upper and lower bases of the wire rope shock absorbers 10 are respectively connected to the vibration isolation upper plate 8 and the vibration isolation lower plate 9. The main load borne by the wire rope shock absorbers 10 is the load in the vertical direction. The bottom end of the vibration isolation lower plate 9 is installed on the mounting frame 2. The vibration isolation lower plate 9 is installed on the mounting frame 2 through multiple groups of adjustable bolts 11, and the vertical position of the vibration isolation lower plate 9 is locked by nuts 12 threadedly sleeved on the adjustable bolts 11. By adjusting the height position of the nuts 12 on the adjustable bolts 11, the installation height position of the vibration isolation lower plate 9 on the laser interferometer can be finely adjusted, so as to ensure the accuracy of the installation height position of the corner cube prism 1. The bottom end of the prism protective cover is slidably arranged on the vibration isolation upper plate 8, and multiple connecting pins 7 are arranged on the vibration isolation upper plate 8 of the first-level vibration isolation assembly. Perforations 13 for the laser to pass through are provided on the mounting frame 2, the vibration isolation upper plate 8 and the vibration isolation lower plate 9 at the positions corresponding to the corner cube prism 1, so as to facilitate the light emitted by the laser interferometer to enter the corner cube prism 1.
[0028] In the second-level vibration isolation assembly, the lateral vibration isolation unit includes several horizontal elastic members evenly distributed along the circumferential direction of the prism protective cover. The horizontal elastic members are installed on the prism protective cover, and the direction of the elastic telescopic force of the horizontal elastic members extends along the radial direction of the prism housing 4. The inner ends of the several horizontal elastic members are respectively elastically pressed against the outer side wall of the prism housing 4. In this embodiment, the horizontal elastic members adopt horizontal elastic plungers 14, and the horizontal elastic plungers 14 are threadedly connected with the threaded holes of the prism protective cover.
[0029] The longitudinal vibration isolation unit includes several vertical elastic members evenly distributed along the circumferential direction of the prism protective cover. The several vertical elastic members are located inside the prism protective cover and outside the prism housing 4. The direction of the elastic telescopic force of the vertical elastic members is parallel to the axis of the prism housing 4. The top end of the vertical elastic members is connected to the prism protective cover, and the bottom end of the vertical elastic members is connected to the top end of the first-level vibration isolation assembly.
[0030] In this embodiment, the vertical elastic members are helical compression springs 15 with the central axes extending vertically. A spring guide post 16 protruding downward is provided at the bottom end of the prism protective cover. The upper end of the helical compression spring 15 is fixedly sleeved on the spring guide post 16, and the lower end of the helical compression spring 15 is fixedly connected to the vibration isolation upper plate 8.
[0031] In the second-level vibration isolation assembly of this embodiment, four horizontal elastic plungers 14 and four helical compression springs 15 are respectively provided, and the four horizontal elastic plungers 14 and the four helical compression springs 15 are arranged alternately along the circumferential direction of the prism housing 4. The corner cube prism 1 is elastically supported vertically by the four helical compression springs 15, and the corner cube prism 1 is provided with elastic support in the horizontal plane by the four horizontal elastic plungers 14 to prevent the corner cube prism 1 from tilting.
[0032] When the laser interferometer receives an impact, the impact is transmitted to the first-level vibration isolation component through the mounting bracket 2. Multiple groups of wire rope shock absorbers 10 inside the first-level vibration isolation component mainly bear the vertical impact. Part of the impact is transmitted to the prism protective cover by the vibration isolation upper plate 8. The prism protective cover is provided with a second-level vibration isolation component composed of a horizontal elastic plunger 14 and a helical compression spring 15. Part of the lateral impact is buffered by the four horizontal elastic plungers 14, and part of the longitudinal impact is buffered by the four helical compression springs 15. Finally, the impact transmitted to the corner cube prism 1 is greatly reduced, thus achieving a good vibration isolation effect and effectively eliminating the influence of the vibration of the corner cube prism 1 on the detection effect of the laser interferometer.
[0033] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.
Claims
1. A secondary vibration isolation device for an upper corner prism of an HCN laser interferometer, where a corner cube prism is provided on the corner cube mounting platform of the HCN laser interferometer, and it is characterized in that: The corner cube prism is mounted on the corner cube mounting platform through a secondary vibration isolation device. The secondary vibration isolation device includes a mounting frame, a primary vibration isolation component, and a secondary vibration isolation component. The mounting frame is mounted on the corner cube mounting platform. The bottom end of the primary vibration isolation component is mounted on the mounting frame. The corner cube prism is mounted on the top end of the primary vibration isolation component through the secondary vibration isolation component. The corner cube prism includes an inner and outer corner cube prism body and a prism housing. The secondary vibration isolation component includes a prism protection cover and a set of lateral vibration isolation units and a set of longitudinal vibration isolation units provided on the prism protection cover. The bottom end of the prism protection cover is slidably provided on the top end of the primary vibration isolation component and can slide vertically. The prism protection cover is located outside the prism housing. The top end of the prism housing is mounted on the prism protection cover. The lateral vibration isolation and longitudinal vibration isolation of the corner cube prism are respectively achieved through a set of lateral vibration isolation units and a set of longitudinal vibration isolation units.
2. The secondary vibration isolation device for the corner prism on the HCN laser interferometer according to claim 1, characterized in that: The lateral vibration isolation unit includes a plurality of horizontal elastic members evenly distributed along the circumferential direction of the prism protection cover. The horizontal elastic members are mounted on the prism protection cover, and the direction of the elastic telescopic force of the horizontal elastic members extends along the radial direction of the prism housing. The inner ends of the plurality of horizontal elastic members are elastically pressed against the outer side wall of the prism housing respectively.
3. The secondary vibration isolation device for the corner prism of the HCN laser interferometer according to claim 1, characterized in that: The longitudinal vibration isolation unit includes a plurality of vertical elastic members evenly distributed along the circumferential direction of the prism protection cover. The plurality of vertical elastic members are located inside the prism protection cover and outside the prism housing. The direction of the elastic telescopic force of the vertical elastic members is parallel to the axis of the prism housing. The top end of the vertical elastic member is connected to the prism protection cover, and the bottom end of the vertical elastic member is connected to the top end of the primary vibration isolation component.
4. The secondary vibration isolation device for the upper corner prism of an HCN laser interferometer according to claim 2, wherein: The horizontal elastic member is a horizontal elastic plunger, and the horizontal elastic plunger is threadedly connected to the threaded hole of the prism protection cover.
5. The secondary vibration isolation device for the corner prism on the HCN laser interferometer according to claim 3, characterized in that: The vertical elastic member is a helical compression spring with a vertical central axis. A spring guide post protruding downward is provided at the bottom end of the prism protection cover. The upper end of the helical compression spring is fixedly sleeved on the spring guide post, and the lower end of the helical compression spring is fixedly connected to the vibration isolation upper plate.
6. The secondary vibration isolation device for the corner prism of the HCN laser interferometer according to claim 1, wherein: A plurality of connection pins evenly distributed along the circumferential direction are provided at the top end of the primary vibration isolation component at the position corresponding to the prism protection cover. The connection pins extend upward in the vertical direction. A plurality of pin holes are opened at the bottom of the prism protection cover. The plurality of pin holes at the bottom of the prism protection cover are in sliding fit with the plurality of connection pins in a one-to-one correspondence.
7. The secondary vibration isolation device for the upper corner prism of an HCN laser interferometer according to claim 1, wherein: The primary vibration isolation component includes a vibration isolation upper plate and a vibration isolation lower plate arranged opposite to each other up and down. The vibration isolation upper plate and the vibration isolation lower plate are connected by multiple groups of primary elastic members. The bottom end of the vibration isolation lower plate is mounted on the mounting frame. The bottom end of the prism protection cover is slidably provided on the vibration isolation upper plate.
8. The secondary vibration isolation device for the upper corner prism of an HCN laser interferometer according to claim 7, characterized in that: The primary elastic member adopts a wire rope shock absorber, and the upper and lower bases of the wire rope shock absorber are respectively connected to the vibration isolation upper plate and the vibration isolation lower plate.
9. The secondary vibration isolation device for the upper corner prism of an HCN laser interferometer according to claim 7, characterized in that: The vibration isolation lower plate is mounted on the mounting frame through multiple groups of adjustable bolts.
10. The secondary vibration isolation device for the upper corner prism of an HCN laser interferometer according to claim 7, characterized in that: Perforations for the laser to pass through are opened on the mounting frame, the vibration isolation upper plate, and the vibration isolation lower plate at the positions corresponding to the corner cube prism.