CN114112326B - Rapid adjustment auxiliary device and adjustment method for off-axis parabolic reflector - Google Patents
Rapid adjustment auxiliary device and adjustment method for off-axis parabolic reflector Download PDFInfo
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- CN114112326B CN114112326B CN202111400291.XA CN202111400291A CN114112326B CN 114112326 B CN114112326 B CN 114112326B CN 202111400291 A CN202111400291 A CN 202111400291A CN 114112326 B CN114112326 B CN 114112326B
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Abstract
The invention discloses a quick adjustment auxiliary device and an adjustment method for an off-axis parabolic reflector, and the quick adjustment auxiliary device comprises a parallel light source, the off-axis parabolic reflector, a small aperture diaphragm, an interferometer and a plane reflector, wherein the parallel light source emits reference parallel light to the center of the off-axis parabolic reflector along the horizontal direction, a focus of the reference light beam is detected, the small aperture diaphragm is placed near the focus, and the position, the left-right inclined distance and the up-down pitching angle of the off-axis parabolic reflector are adjusted so that the size of a focus spot is minimum and the focus and the reference parallel light are kept on the same horizontal plane, and the quick adjustment auxiliary device particularly relates to the technical field of optical detection and adjustment. The method for rapidly adjusting the off-axis paraboloid is based on a general adjusting method, only one parallel light source is additionally arranged for matching adjustment, the difficulty of focusing of single-beam light adjustment of an interferometer is overcome, the method has no strict requirement on the beam width of the parallel light source, and the method has the advantages of good simplicity, rapidness, feasibility and the like.
Description
Technical Field
The invention belongs to the technical field of optical detection and adjustment, and particularly relates to a rapid adjustment auxiliary device and an adjustment method for an off-axis parabolic reflector.
Background
With the rapid development of processing technology and tuning technology, the off-axis aspheric element, especially the off-axis parabolic reflector, is increasingly widely applied and required in optical systems. The off-axis paraboloid plays an increasingly important role in the optical detection system due to the advantages of simplifying the system structure, reducing the system size, improving the imaging quality and the like. The deviation of the position and angle during off-axis surface adjustment brings various aberrations such as defocus, astigmatism, coma and the like to the system, so that the speed and precision of off-axis surface adjustment are improved, and the off-axis surface adjustment is also an important target in the field of optical adjustment.
At present, the off-axis paraboloid is assembled and adjusted mainly by detecting the matching assembly through an interferometer, generally, the interferometer emits a single beam of light, and the beam returns to the original path after passing through a parabolic mirror and a plane reflector and is detected by the interferometer. The method has the difficulty that under the condition of using only one beam of light, the calibration error of the focus position of the off-axis paraboloid is large, the confocal and the overlap ratio of the round-trip light path are not easy to quickly reach an ideal state, and interference fringes are difficult to quickly detect.
The invention uses a parallel light as a reference light beam, firstly, the focus of the off-axis parabolic reflector is preliminarily confirmed, and a reference is provided for the subsequent focusing of the interferometer. According to the invention, through confocal and coincidence of two beams of light, the relative position and angle of the interferometer and the off-axis paraboloid are rapidly determined; and then the plane reflector is used for replacing the parallel light source, the round-trip test light beams are overlapped by adjusting the angle of the plane reflector, so that interference fringes can be rapidly detected, the position and the angle of the off-axis paraboloid can be finely adjusted, and the wavefront difference is reduced to the minimum. On the basis of a general adjustment method, the method only adds one parallel light source to be matched and adjusted, overcomes the difficulty of single-beam light adjustment and focusing of an interferometer, has no strict requirement on the beam width of the parallel light source, and has the advantages of good simplicity, rapidity, feasibility and the like.
Disclosure of Invention
The invention aims to provide a rapid adjustment auxiliary device and an adjustment method for an off-axis parabolic reflector, so as to solve the problems in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions: the quick adjustment auxiliary device for the off-axis parabolic reflector comprises a parallel light source, an off-axis parabolic reflector, an aperture diaphragm, an interferometer and a plane reflector, and the method comprises the following steps:
A) The parallel light source emits reference parallel light to the center of the off-axis parabolic reflector along the horizontal direction, detects the focus of the reference light beam, places the aperture diaphragm near the focus,
B) The position, the left-right tilting distance and the up-down pitching angle of the off-axis parabolic reflector are adjusted to ensure that the focal spot size is minimum and the focal point and the reference parallel light are kept on the same level,
C) The interferometer is arranged behind the focus of the reference beam, a standard spherical lens is arranged at the emergent window of the interferometer to make the interferometer emit a test beam, then the test beam is emitted and converged near the aperture diaphragm,
D) Firstly, adjusting the position of the interferometer to enable the focus of the test beam to coincide with the focus of the reference beam, keeping the test beam and the reference beam in confocal, then continuously adjusting the left-right inclination and the up-down pitching directions of the interferometer to enable the spots of the test beam and the reference beam to be concentric and the optical axis to be horizontal,
E) And replacing the reference parallel light source with the plane reflector, adjusting the position and angle of the plane reflector to enable the test light beam to return to the interferometer in the original path, finely adjusting the positions and angles of the off-axis parabolic reflector and the plane reflector according to the interference surface shape, eliminating aberration such as astigmatism, coma aberration and the like, and minimizing wavefront difference.
Preferably, the plane reflector comprises a connecting frame, a first screw rod rotationally connected with the connecting frame, a second screw rod rotationally connected with the connecting frame, a first screw rod cylinder assembly arranged outside the first screw rod, a second screw rod cylinder assembly arranged outside the second screw rod and a movable assembly arranged at the side of the connecting frame, wherein the second screw rod cylinder assembly comprises a second screw rod cylinder sleeved on the outer circumferential wall of the second screw rod and a connecting plate arranged above the second screw rod cylinder, the parallel light source is in contact connection with the connecting plate, the plane reflector is in contact connection with the connecting plate, the first screw rod cylinder assembly comprises a first screw rod cylinder sleeved on the outer circumferential wall of the first screw rod, a rotating shaft arranged above the first screw rod cylinder, a rotating sleeve arranged above the rotating shaft, a sliding sleeve arranged above the rotating sleeve, a sliding seat arranged inside the sliding sleeve and a hinge arranged above the sliding seat, wherein the off-axis parabolic reflector is hinged with the sliding seat through the hinge, the movable assembly comprises a sliding cabinet fixed on the top wall of the connecting frame, a sliding plate arranged inside the sliding cabinet, a sliding block sliding rod arranged on the side wall of the sliding plate, a sliding block arranged on the outer side of the sliding block sliding rod, a vertical cylinder arranged on the top wall of the sliding block and a vertical rod arranged inside the vertical cylinder, and the aperture diaphragm is arranged on the top wall of one vertical rod and is arranged on the top wall of the other vertical rod.
Preferably, the side of link is provided with the backplate, the backplate is close to the lateral wall of link and installs the scale, the lateral wall of first lead screw section of thick bamboo, second lead screw section of thick bamboo and movable assembly all is provided with the pointer.
Preferably, the sliding seat is fixed with the sliding sleeve through the fastening rod, the inserting rod is welded on the bottom wall of the connecting plate, the jack is formed in the top wall of the second screw barrel, and the inserting rod is matched with the jack.
Preferably, a slide block adjusting rod is arranged on the side wall of the slide block, and a handle is arranged on the end wall of the slide block adjusting rod.
Preferably, a backboard sliding rod is mounted on the side wall of the backboard, a sliding rod hole is formed in the connecting frame, and the backboard sliding rod is matched with the sliding rod hole.
Preferably, the end wall of the sliding plate far away from the sliding rod of the sliding block is provided with a connecting rod, and the top wall of the connecting rod is provided with a handle.
Preferably, the end wall of the sliding block and the end wall of the backboard are welded with baffles.
Preferably, the side walls of the first screw rod cylinder and the second screw rod cylinder are welded with handle bars.
Preferably, the vertical cylinder and the vertical rod are connected through a positioning rod, and the fastening rod is connected with the sliding sleeve and the positioning rod in a screwing way through threads.
Compared with the prior art, the invention has the following beneficial effects:
(1) The method for rapidly adjusting the off-axis paraboloid only adds one parallel light source to be matched and adjusted on the basis of a general adjusting method, overcomes the difficulty of single-beam light adjustment and focusing of an interferometer, has no strict requirement on the beam width of the parallel light source, and has the advantages of good simplicity, rapidity, feasibility and the like.
(2) The method is not only suitable for quick assembly and adjustment of the off-axis parabolic reflector, but also suitable for quick assembly and detection of other off-axis aspheric reflectors, and has great engineering application value only by adding a compensating mirror with proper caliber and shape in the device.
(3) According to the method for rapidly adjusting the off-axis paraboloid, due to the arrangement of the scale and the pointer, the displacement distance of the device can be calculated when any element moves, and then personnel record the data so as to facilitate the next focusing operation of the device, thereby improving the operation efficiency.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is one of the schematic diagrams of the method of the present invention;
FIG. 3 is a second schematic diagram of the method of the present invention;
FIG. 4 is a third schematic diagram of the method of the present invention;
FIG. 5 is a front view of the present invention;
FIG. 6 is a schematic view of a movable assembly according to the present invention;
FIG. 7 is a schematic view of the structure of the first screw barrel assembly of the present invention;
FIG. 8 is a schematic structural view of a second screw barrel assembly of the present invention;
in the figure: 1. a parallel light source; 2. off-axis parabolic mirrors; 3. a small aperture stop; 4. an interferometer; 5. a planar mirror; 6. a back plate; 61. a pointer; 62. a ruler; 63. a backboard sliding rod; 64. a baffle; 7. a movable assembly; 70. a slide block adjusting rod; 71. a sliding cabinet; 72. a slide plate; 73. a slide bar of the slide block; 74. a slide block; 75. a vertical cylinder; 76. a vertical rod; 77. a positioning rod; 78. a handle; 79. a connecting rod; 8. a first screw barrel assembly; 81. a first screw barrel; 82. a rotating shaft; 83. a rotating sleeve; 84. a hinge; 85. a slide; 86. a fastening rod; 87. a sliding sleeve; 9. a second screw barrel assembly; 91. a second screw barrel; 92. a connecting plate; 93. a rod; 94. a jack; 10. a handle bar; 11. a connecting frame; 12. a first lead screw; 13. a slide bar hole; 14. and a second lead screw.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 to 8, the present invention provides the following technical solutions: the quick adjustment auxiliary device for the off-axis parabolic reflector comprises a parallel light source 1, an off-axis parabolic reflector 2, an aperture diaphragm 3, an interferometer 4 and a plane reflector 5, and the method comprises the following steps: the parallel light source 1 emits reference parallel light to the center of the off-axis parabolic reflector 2 along the horizontal direction, detects the focus of the reference light beam, and places the aperture diaphragm 3 near the focus; the position, the left-right inclination distance and the up-down pitching angle of the off-axis parabolic reflector 2 are adjusted, so that the focal spot size is minimum and the focal point and the reference parallel light are kept on the same horizontal plane; the interferometer 4 is arranged behind the focus of the reference beam, a standard spherical lens is arranged at the emergent window of the interferometer 4 to emit a test beam, and then the test beam is emitted and converged near the aperture diaphragm 3; firstly, adjusting the position of the interferometer 4 to enable the focus of the test beam to coincide with the focus of the reference beam, keeping the test beam and the reference beam in confocal, and then continuously adjusting the left-right inclination and the up-down pitching direction of the interferometer 4 to enable the spots of the test beam and the reference beam to be concentric and the optical axis to be horizontal; the plane reflector 5 is used for replacing the reference parallel light source 1, the position and the angle of the plane reflector 5 are adjusted to enable the test light beam to return to the interferometer 4 in an original path, the positions and the angles of the off-axis parabolic reflector 2 and the plane reflector 5 are finely adjusted according to the interference surface shape, the aberration such as astigmatism, coma aberration and the like is eliminated, and the wavefront difference is minimized; the device also comprises a connecting frame 11, a first screw rod 12 rotationally connected with the connecting frame 11, a second screw rod 14 rotationally connected with the connecting frame 11, a first screw rod cylinder assembly 8 arranged outside the first screw rod 12, a second screw rod cylinder assembly 9 arranged outside the second screw rod 14 and a movable assembly 7 arranged at the side of the connecting frame 11, wherein the second screw rod cylinder assembly 9 comprises a second screw rod cylinder 91 sleeved on the outer circumferential wall of the second screw rod 14 and a connecting plate 92 arranged above the second screw rod cylinder 91, the parallel light source 1 is in contact connection with the connecting plate 92, the plane reflecting mirror 5 is in contact connection with the connecting plate 92, the first screw rod cylinder assembly 8 comprises a first screw rod cylinder 81 sleeved on the outer circumferential wall of the first screw rod 12, a rotating shaft 82 arranged above the first screw rod cylinder 81, a rotating sleeve 83 arranged above the rotating shaft 82, a sliding sleeve 87 arranged above the rotating sleeve 83, a sliding seat 85 arranged inside the sliding sleeve 87 and a hinge 84 arranged above the sliding seat 85, the off-axis parabolic reflector 2 is hinged with a sliding seat 85 through a hinge 84, the movable assembly 7 comprises a sliding cabinet 71 fixed on the top wall of the connecting frame 11, a sliding plate 72 arranged in the sliding cabinet 71, a sliding plate 73 arranged on the side wall of the sliding plate 72, a sliding block 74 arranged on the outer side of the sliding plate 73, a vertical cylinder 75 arranged on the top wall of the sliding block 74 and a vertical rod 76 arranged in the vertical cylinder 75, the aperture diaphragm 3 is arranged on the top wall of one vertical rod 76, the interferometer 4 is arranged on the top wall of the other vertical rod 76, a backboard 6 is arranged on the side of the connecting frame 11, a scale 62 is arranged on the side wall of the backboard 6 close to the connecting frame 11, pointers 61 are arranged on the side walls of the first lead screw cylinder 81, the second lead screw cylinder 91 and the movable assembly 7, the sliding seat 85 fixes the sliding sleeve 87 through a fastening rod 86, an inserting rod 93 is welded on the bottom wall of the connecting plate 92, a jack 94 is arranged on the top wall of the second lead screw cylinder 91, the inserted link 93 is matched with the jack 94, the slide adjusting rod 70 is installed on the side wall of the slide 74, the handle 78 is installed on the end wall of the slide adjusting rod 70, the back plate sliding rod 63 is installed on the side wall of the back plate 6, the sliding rod hole 13 is formed in the connecting frame 11, the back plate sliding rod 63 is matched with the sliding rod hole 13, the connecting rod 79 is installed on the end wall of the sliding plate 72, which is far away from the slide sliding rod 73, of the sliding plate 73, the handle 78 is installed on the top wall of the connecting rod 79, the baffle 64 is welded on the end wall of the sliding plate 73, which is far away from the sliding plate 72, of the end wall of the back plate sliding rod 63, the handle 10 is welded on the side wall of the first screw barrel 81 and the second screw barrel 91, the vertical barrel 75 and the vertical rod 76 are connected through the positioning rod 77, the fastening rod 86 is connected with the sliding sleeve 87, the positioning rod 77 is connected with the vertical barrel 75 in a screwing mode, on the basis of a general installation and adjustment method, only one parallel light source 1 is additionally arranged, the difficulty of single-light installation and adjustment focusing of the interferometer 4 is overcome, the method has no strict requirements on the beam width of the parallel light source 1, and the advantages of good simplicity, rapidness and feasibility are achieved.
In the process of specifically implementing the method for rapidly adjusting the off-axis paraboloid, firstly, a parallel light source 1 is mounted on a connecting plate 92, then the inserting rod 93 is inserted into the inserting hole 94 through the adapting relation between the inserting rod 93 and the inserting hole 94 to realize the mounting operation of the parallel light source 1, then in the process of adjusting the off-axis paraboloid reflecting mirror 2, the left-right inclination distance of the sliding seat 85 is adjusted through the movable connection of the sliding seat 85 and the sliding sleeve 87, the pitching angle of the off-axis paraboloid reflecting mirror 2 is adjusted through the hinge 84, the distance between the parallel light source 1 and the off-axis paraboloid reflecting mirror 2 is adjusted through the movable connection of the first screw rod cylinder 81 and the first screw rod 12 and the second screw rod 91 and the movable connection of the second screw rod 14, then the sliding seat 85 is fixed through a fastening rod 86, and meanwhile, the moving distance between the parallel light source 1 or the off-axis paraboloid reflecting mirror 2 can be calculated and recorded through the pointer 61 on the side wall of the first screw rod cylinder 81 and the second screw rod cylinder 91;
In the process of realizing the adjustment of the aperture diaphragm 3 and the interferometer 4, firstly, the handle 78 is held to drive the sliding plate 72 to slide in the sliding cabinet 71, then the handle 78 is held to drive the sliding plate 74 to slide in the sliding plate 73, then the positions of the vertical tube 75 and the vertical rod 76 are adjusted to realize the adjustment operation of the aperture diaphragm 3 or the interferometer 4, and similarly, the distance between the aperture diaphragm 3 or the interferometer 4 can be calculated and recorded through the pointer 61 connected with the side wall of the connecting rod 79 in the adjustment process of the aperture diaphragm 3 or the interferometer 4;
In the adjusting process, the connecting plate 92 can not only be used for placing the parallel light source 1, but also be used for placing the plane reflecting mirror 5, and it should be noted that the parallel light source 1 or the plane reflecting mirror 5 should be stably placed on the connecting plate 92, so that the probability of the parallel light source 1 or the plane reflecting mirror 5 falling and being broken in the moving process of the second screw barrel 91 can be reduced.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. An auxiliary device and method for rapidly adjusting an off-axis parabolic reflector are characterized in that: the method comprises the following steps of:
A) The parallel light source (1) emits reference parallel light to the center of the off-axis parabolic reflector (2) along the horizontal direction, detects the focus of the reference light beam, and places the aperture diaphragm (3) near the focus;
b) The position, the left-right inclined distance and the up-down pitching angle of the off-axis parabolic reflector (2) are adjusted, so that the focal spot size is minimum and the focal point and the reference parallel light are kept on the same horizontal plane;
C) The interferometer (4) is arranged behind a reference beam focus, a standard spherical lens is arranged at an emergent window of the interferometer (4) to emit a test beam, and then the test beam is emitted and converged near the aperture diaphragm (3);
D) Firstly, adjusting the position of the interferometer (4) to enable the focus of the test beam to coincide with the focus of the reference beam, keeping the test beam and the reference beam in confocal mode, and then continuously adjusting the left-right inclination and the up-down pitching direction of the interferometer (4) to enable the spots of the test beam and the reference beam to be concentric and the optical axis to be horizontal;
E) The plane reflector (5) is used for replacing the reference parallel light source (1), the position and the angle of the plane reflector (5) are adjusted to enable the original path of the test light beam to return to the interferometer (4), the positions and the angles of the off-axis parabolic reflector (2) and the plane reflector (5) are finely adjusted according to the interference surface shape, the aberration such as astigmatism and coma aberration is eliminated, and the wavefront difference is reduced to the minimum.
2. The rapid tuning auxiliary device and tuning method for off-axis parabolic reflector according to claim 1, wherein: the plane reflector (5) is in contact connection with the connecting plate (92), the first screw barrel assembly (8) is arranged on the outer side of the first screw (12), the second screw barrel assembly (9) is arranged on the outer side of the second screw (14) and the movable assembly (7) is arranged on the side of the connecting frame (11), the second screw barrel assembly (9) comprises a second screw barrel (91) sleeved on the outer circumferential wall of the second screw (14) and a connecting plate (92) arranged above the second screw barrel (91), the parallel light source (1) is in contact connection with the connecting plate (92), the plane reflector (5) is in contact connection with the connecting plate (92), the first screw barrel assembly (8) comprises a first screw barrel (81) sleeved on the outer circumferential wall of the first screw (12), a rotating shaft (82) arranged above the first screw barrel (81), a rotating sleeve (83) arranged above the first screw barrel (82), a rotating sleeve (83) arranged above the rotating sleeve (83) and a sliding sleeve (84) arranged above the sliding sleeve (84) and a sliding sleeve (85) arranged above the sliding sleeve (84) in a sliding seat (84), the movable assembly (7) comprises a sliding cabinet (71) fixed on the top wall of the connecting frame (11), a sliding plate (72) arranged in the sliding cabinet (71), a sliding block sliding rod (73) arranged on the side wall of the sliding plate (72), a sliding block (74) arranged on the outer side of the sliding block sliding rod (73), a vertical cylinder (75) arranged on the top wall of the sliding block (74) and a vertical rod (76) arranged in the vertical cylinder (75), the aperture diaphragm (3) is arranged on the top wall of one vertical rod (76), and the interferometer (4) is arranged on the top wall of the other vertical rod (76).
3. The rapid tuning auxiliary device and tuning method for off-axis parabolic reflector according to claim 2, wherein: the side of link (11) is provided with backplate (6), backplate (6) are close to the lateral wall of link (11) and install scale (62), the lateral wall of first lead screw section of thick bamboo (81), second lead screw section of thick bamboo (91) and movable component (7) all is provided with pointer (61).
4. A quick set-up assist apparatus and set-up method for an off-axis parabolic reflector as defined in claim 3, wherein: the sliding seat (85) is fixed with the sliding sleeve (87) through the fastening rod (86), the bottom wall of the connecting plate (92) is welded with the inserting rod (93), the top wall of the second screw rod barrel (91) is provided with the inserting hole (94), and the inserting rod (93) is matched with the inserting hole (94).
5. The rapid tuning assist apparatus and tuning method for an off-axis parabolic reflector as claimed in claim 4, wherein: a slide block adjusting rod (70) is arranged on the side wall of the slide block (74), and a handle (78) is arranged on the end wall of the slide block adjusting rod (70).
6. The rapid tuning assist apparatus and tuning method for an off-axis parabolic reflector as claimed in claim 5, wherein: the side wall of the backboard (6) is provided with a backboard sliding rod (63), a sliding rod hole (13) is formed in the connecting frame (11), and the backboard sliding rod (63) is matched with the sliding rod hole (13).
7. The rapid tuning assist apparatus and tuning method for an off-axis parabolic reflector as claimed in claim 6, wherein: the end wall of the sliding plate (72) far away from the sliding plate (73) is provided with a connecting rod (79), and the top wall of the connecting rod (79) is provided with a handle (78).
8. The rapid tuning assist apparatus and tuning method for an off-axis parabolic reflector as claimed in claim 7, wherein: the end wall of the sliding block and sliding rod (73) far away from the sliding plate (72) and the end wall of the back plate and sliding rod (63) far away from the back plate (6) are welded with baffle plates (64).
9. The rapid tuning assist apparatus and tuning method for an off-axis parabolic reflector as claimed in claim 8, wherein: the side walls of the first screw rod cylinder (81) and the second screw rod cylinder (91) are welded with a handle rod (10).
10. The rapid tuning assist apparatus and tuning method for an off-axis parabolic reflector as claimed in claim 9, wherein: the vertical tube (75) is connected with the vertical tube (76) through a positioning rod (77), and the fastening rod (86) is connected with the sliding sleeve (87) and the positioning rod (77) is screwed with the vertical tube (75) through threads.
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| CN111189386A (en) * | 2020-01-13 | 2020-05-22 | 中国科学院上海光学精密机械研究所 | Correction method for surface shape projection distortion of off-axis parabolic reflector interferometry |
| CN111664803A (en) * | 2020-06-04 | 2020-09-15 | 中国科学院西安光学精密机械研究所 | Rapid detection method and device for off-axis parabolic reflector |
| CN113204127A (en) * | 2021-05-18 | 2021-08-03 | 中国科学院长春光学精密机械与物理研究所 | Assembling and adjusting method of off-axis parabolic mirror group |
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