Device for detecting precision of lens of photoelectric autocollimator

Abstract

The utility model discloses a device for detecting the precision of a photoelectric auto-collimator lens, which comprises a detection assembly, a measuring rope and pull rope assemblies, the pull rope assemblies are respectively arranged on two sides of the detection assembly, the detection assembly comprises a base, an auto-collimator, a diaphragm assembly and a reflector, the diaphragm assembly is arranged between the auto-collimator and the reflector, and the measuring rope is arranged on the base. The autocollimator, the diaphragm assembly and the reflector are located on different bases respectively, the measuring rope comprises a first section and a second section which are parallel to each other, the first section and the second section are located on the two sides of the bases respectively, and the first section and the second section are connected with the pull rope assembly and the bases in series respectively; during calibration, emergent light of the autocollimator irradiates on the reflector through the cross-shaped light hole, then is reflected back to the autocollimator and is focused on the CCD in a cross-shaped manner after passing through the objective lens of the autocollimator, and then the three-axis adjusting seat is adjusted to change the position of the cross-shaped cursor, so that the precision information of the light at different positions of the objective lens can be obtained. Therefore, the influence of spherical aberration on the photoelectric autocollimator is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of photoelectric autocollimators, in particular to a device for detecting the accuracy of a lens of a photoelectric autocollimator. Background Art

[0002] Photoelectric autocollimator, as a high-precision optical measuring instrument, is widely used in optical measurement, precision mechanical adjustment and other fields. Its working principle is based on the accurate imaging and position detection of light after passing through the optical system; specifically, the light first passes through the graticule on the focal plane of the objective lens, and forms parallel light through the objective lens. These parallel lights are then reflected back by the reflector perpendicular to the optical axis, and pass through the collimating lens again, and finally are turned by the beam splitter prism and converged on the CCD (charge coupled device) surface located on the conjugate focal plane to form a graticule image.

[0003] When the reflector is tilted at a small angle, the reflected light beam will produce a corresponding difference angle, which will cause the image of the graticule located on the photosensitive surface of the CCD detector to shift. Through the image processing algorithm, this shift can be measured and analyzed, thereby accurately calculating the angular displacement of the reflector.

[0004] However, due to the optical design and structural characteristics of the photoelectric autocollimator, it generally has a certain spherical aberration. If the spherical aberration is not corrected, it will seriously affect the accuracy and reliability of the measurement results. Therefore, it is very important to calibrate the photoelectric autocollimator regularly.

[0005] At present, high-precision optical detection instruments such as interferometers, wavefront sensors, and optical test benches are usually used to calibrate the spherical aberration of photoelectric autocollimators. Although these devices can provide high-precision calibration results, they are often extremely expensive and cumbersome to operate, requiring professional technicians to operate and maintain. Therefore, these devices are usually only used in laboratories to calibrate photoelectric autocollimators during production, and are not convenient for regular calibration of photoelectric autocollimators in daily use.

[0006] In order to solve this problem, it is necessary to develop a simpler, cost-effective and easy-to-operate photoelectric autocollimator calibration device. Summary of the invention

[0007] The utility model aims to provide a device for detecting the accuracy of a photoelectric autocollimator lens in view of the problems existing in the prior art.

[0008] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0009] A device for detecting the accuracy of a photoelectric autocollimator lens comprises a detection component, a measuring rope and a pull rope component, the pull rope components are respectively arranged on both sides of the detection component, the detection component comprises a base, an autocollimator, an aperture component and a reflector, the aperture component is located between the autocollimator and the reflector, the autocollimator, the aperture component and the reflector are respectively located on different bases, the measuring rope comprises a first section and a second section parallel to each other, the first section and the second section are respectively located on both sides of the base, and the first section and the second section respectively connect the pull rope component and the base in series.

[0010] The utility model calibrates the autocollimator through the aperture assembly and the reflector. The rays of the autocollimator are irradiated on the reflector after passing through the small hole of the aperture assembly, and then reflected back to the autocollimator. After passing through the objective lens of the autocollimator, they are focused on the CCD in the form of a "cross". By adjusting the three-axis adjustment seat to change the position of the "cross" cursor, the accuracy information of the light at different positions of the objective lens can be obtained, thereby reducing the influence of spherical aberration on the photoelectric autocollimator.

[0011] Preferably, the aperture assembly comprises a cross aperture and a three-axis adjustment seat, the cross aperture is arranged on the three-axis adjustment seat, and a cross-shaped light-transmitting hole is provided on the cross aperture.

[0012] The light-transmitting hole is used to shield part of the light projected by the telescopic autocollimator, so that the reflected light can be focused on the CCD of the autocollimator in a "cross" form.

[0013] Preferably, the base comprises a water tank and a leveling platform, at least three sleeves are provided on the top of the water tank, and a floating column is provided on the bottom of the leveling platform, and the floating column is slidably connected to the sleeves.

[0014] The autocollimator, the aperture assembly and the reflector are leveled respectively through the base so that the three can be at the same height, and it is ensured that there is no angle reflection of the light projected from the autocollimator to the reflector to ensure the accuracy of calibration.

[0015] Preferably, a plurality of bolt mounting holes are provided on the top of the leveling platform, and the autocollimator, the aperture assembly and the reflector are detachably connected to the leveling platform via bolts.

[0016] Preferably, ear plates are respectively provided on both sides of the water tank, through holes are provided on the ear plates, the water tank is connected to the measuring rope through the through holes, and a water injection pipe is also provided on one side of the water tank, and the water injection port of the water injection pipe is higher than the top of the sleeve.

[0017] The water injection pipe is used to add water to the water tank to change the height of the liquid level in the water tank so that the leveling platform rises and falls with the liquid level.

[0018] Preferably, the rope pulling assembly includes a base plate, a rope clamp and a pulley, the rope clamp and the pulley are arranged on the base plate, the pulley is rotatably connected to the base plate, the rope clamps are respectively provided on both sides of the pulley, the rope pulling assembly detachably fixes the measuring rope through the rope clamp, and the measuring rope is arranged around the pulley.

[0019] The pull rope assembly and the measuring rope are used to place the bases in the same straight line, ensuring that the light emitted by the autocollimator can pass through the aperture assembly and be projected onto the reflector. When the distance between the bases needs to be changed according to the working distance of the autocollimator, it is only necessary to adjust the length of the pull rope assembly and the measuring rope, which has versatility.

[0020] Preferably, the rope clamp comprises a pair of clamping jaws, the clamping jaws are rotatably connected to the base plate, the measuring rope passes through between the clamping jaws, and the rope clamp is used for detachably fixing the telescopic measuring rope.

[0021] Preferably, the measuring rope also includes a connecting section, through which the end of the first section is connected to the end of the second section, the connecting section bypasses the pulley arrangement of the pull rope assembly, and the top end of the first section and the top end of the second section are wrapped around the pulley of another pull rope assembly.

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] (1) The utility model calibrates the autocollimator through an aperture assembly and a reflector. The rays of the autocollimator pass through the small hole of the aperture assembly and illuminate the reflector. They are then reflected back to the autocollimator and focused on the CCD in a "cross" form after passing through the objective lens of the autocollimator. By adjusting the position of the "cross" cursor by adjusting the three-axis adjustment seat, the accuracy information of the light at different positions of the objective lens can be obtained, thereby reducing the influence of spherical aberration on the photoelectric autocollimator.

[0024] (2) The utility model places each base on the same straight line through the pull rope assembly and the measuring rope, ensuring that the light emitted by the autocollimator can pass through the aperture assembly and be projected onto the reflector. When the distance between each base needs to be changed according to the working distance of the autocollimator, it is only necessary to adjust the length of the pull rope assembly and the measuring rope, which is versatile.

[0025] (3) The utility model uses the base to level the autocollimator, the aperture assembly and the reflector respectively, so that the three can be at the same height, and ensure that there is no angle reflection of the light projected from the autocollimator to the reflector, so as to ensure the accuracy of calibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0027] Figure 2 This is a schematic diagram of the structure of the base in the first embodiment of the present utility model;

[0028] Figure 3 This is a schematic diagram of the structure of the water tank in the first embodiment of the utility model;

[0029] Figure 4 This is a schematic diagram of the structure of the pull rope assembly in the first embodiment of the utility model;

[0030] Figure 5 This is a schematic diagram of the structure of the pull rope assembly in the second embodiment of the present utility model;

[0031] Figure 6 This is a schematic diagram of the structure of the aperture assembly in the first embodiment of the utility model;

[0032] In the figure: 1. base; 101. water tank; 102. leveling platform; 103. sleeve; 104. water injection pipe; 2. rope pull assembly; 201. rope clamp; 202. pulley; 3. autocollimator; 4. aperture assembly; 401. cross aperture; 402. three-axis adjustment seat; 5. reflector; 6. measuring rope; 601. first section; 602. second section. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the utility model to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as "middle", "upper", "lower", "left", "right", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0035] like Figures 1 to 6As shown, the specific scheme of the embodiment is as follows: Embodiment 1: A device for detecting the accuracy of a photoelectric autocollimator lens comprises a detection component, a measuring rope 6 and a rope pulling component 2, the rope pulling component 2 comprises a base plate, a rope clamp 201 and a pulley 202, the rope clamp 201 and the pulley 202 are arranged on the base plate, the pulley 202 is rotatably connected to the base plate, rope clamps 201 are respectively arranged on both sides of the pulley 202, and the measuring rope 6 is arranged around the pulley 202.

[0036] The rope clamp 201 includes a pair of clamping jaws, which are rotatably connected to the bottom plate. The measuring rope 6 passes through the clamping jaws. The measuring rope 6 is fixed or released by rotating the clamping jaws.

[0037] A pull rope assembly 2 is provided on both sides of the detection assembly. The detection assembly includes a base 1, an autocollimator 3, an aperture assembly 4 and a reflector 5. The autocollimator 3 is a photoelectric autocollimator. The aperture assembly 4 is located between the autocollimator 3 and the reflector 5.

[0038] The measuring rope 6 includes a first section 601 and a second section 602 which are parallel to each other. The first section 601 and the second section 602 are respectively located on both sides of the base 1. The first section 601 and the second section 602 are respectively connected in series with the pull rope assembly 2 and the base 1. By adjusting the interval of the pull rope assembly 2, the first section 601 and the second section 602 are straightened, thereby ensuring that the pull rope assembly 2 and each base 1 are arranged along the same straight line.

[0039] Compared with continuously adjusting the positions of the aperture assembly 4 and the reflector 5 by observing the light projected by the autocollimator 3, it is only necessary to install the autocollimator 3, the aperture assembly 4 and the reflector 5 on the central axis of different bases 1, so as to ensure that the autocollimator 3, the aperture assembly 4 and the reflector 5 can also be arranged along the same straight line, thereby simplifying the preparation process before calibration.

[0040] The aperture assembly 4 comprises a cross aperture 401 and a three-axis adjustment seat 402 . The cross aperture 401 is arranged on the three-axis adjustment seat 402 . A cross-shaped light-transmitting hole is arranged on the cross aperture 401 .

[0041] The base 1 includes a water tank 101 and a leveling platform 102 . At least three sleeves 103 are provided on the top of the water tank 101 . A floating column is provided on the bottom of the leveling platform 102 . The floating column is slidably connected to the sleeves 103 .

[0042] After the water tanks 101 are filled with water, if the base 1 is placed on an inclined ground or table, the liquid levels in each water tank 101 remain horizontal due to the influence of gravity, and the floating columns float in the water, rising and falling with the liquid levels in different sleeves 103, so that each leveling platform 102 can remain horizontal.

[0043] The sleeve 103 is provided with fixing bolts on the side. When the leveling platform 102 is stable, the fixing bolts are used to tighten the floating column to fix the leveling platform 102 to avoid destroying the horizontal state of the leveling platform 102 when installing the autocollimator 3, the aperture assembly 4 or the reflector 5.

[0044] A plurality of bolt mounting holes are provided on the top of the leveling platform 102 , and the autocollimator 3 , the aperture assembly 4 and the reflector 5 are detachably connected to the leveling platform 102 via bolts.

[0045] Ear plates are respectively provided on both sides of the water tank 101, and through holes are provided on the ear plates. The water tank 101 is connected to the measuring rope 6 through the through holes. A water injection pipe 104 is also provided on one side of the water tank 101. The water injection port of the water injection pipe 104 is higher than the top of the sleeve 103. Water is added to the water tank 101 through the water injection pipe 104. When the height of the leveling platform 102 needs to be changed, water only needs to be added to raise the liquid level in the water tank 101.

[0046] The working principle of this embodiment is as follows:

[0047] (1) Select a suitable calibration distance according to the working distance of the autocollimator 3 to determine the spacing between the autocollimator 3, the aperture assembly 4 and the reflector 5, and place the base 1 according to the spacing between the three.

[0048] (2) Place the pull rope assembly 2, use the measuring rope 6 to connect the pull rope assembly 2 and each base 1 in series, and straighten the first section 601 and the second section 602 of the measuring rope 6. According to the specifications of the autocollimator 3, the aperture assembly 4 and the reflector 5, adjust the height of each leveling platform 102. After the leveling platform 102 is stable, fix the leveling platform 102, and install the autocollimator 3, the aperture assembly 4 and the reflector 5.

[0049] (3) Connect the autocollimator 3 to the computer, and adjust the position of the cross diaphragm 401 through the three-axis adjustment seat 402 to align the center of the light-transmitting hole with the center position of the autocollimator 3 to ensure that the central part of the output light of the autocollimator 3 can pass through the light-transmitting hole. Record the coordinate position on the computer screen at this time and mark it as the reference point.

[0050] (4) Move the cross diaphragm 401 and record the coordinates of the “cross” cursor after the reflected light passes through different positions of the objective lens of the autocollimator 3 in the horizontal and vertical directions at regular intervals.

[0051] (5) Based on the measured coordinate data, the relationship between different incident positions of the objective lens of the autocollimator 3 and the change in accuracy is calculated, and the spherical aberration of the autocollimator 3 is corrected accordingly.

[0052] Embodiment 2: Figure 5As shown, the difference between the second embodiment and the first embodiment is that the measuring rope 6 also includes a connecting section, the end of the first section 601 is connected to the end of the second section 602 via the connecting section, the connecting section is arranged around the pulley 202 of the pull rope assembly 2, the top of the first section 601 and the top of the second section 602 are wound around the pulley 202 of another pull rope assembly 2, and a crank is provided on the pulley 202. The pulley 202 is rotated by turning the crank to rotate the pulley 202 to tighten the measuring rope 6 wound around the pulley 202, so as to facilitate straightening the first section 601 and the second section 602.

[0053] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for detecting the accuracy of a photoelectric autocollimator lens, characterized in that: It includes a detection component, a measuring rope and a pull rope component, the pull rope components are respectively provided on both sides of the detection component, the detection component includes a base, an autocollimator, an aperture component and a reflector, the aperture component is located between the autocollimator and the reflector, the autocollimator, the aperture component and the reflector are respectively located on different bases, the measuring rope includes a first section and a second section parallel to each other, the first section and the second section are respectively located on both sides of the base, the first section and the second section are respectively connected in series to the pull rope component and the base.

2. The device for detecting the accuracy of a photoelectric autocollimator lens according to claim 1, characterized in that: The aperture assembly comprises a cross aperture and a three-axis adjustment seat, the cross aperture is arranged on the three-axis adjustment seat, and a cross-shaped light-transmitting hole is provided on the cross aperture.

3. The device for detecting the accuracy of a photoelectric autocollimator lens according to claim 1, characterized in that: The base comprises a water tank and a leveling platform. At least three sleeves are arranged on the top of the water tank. A floating column is arranged on the bottom of the leveling platform. The floating column is slidably connected with the sleeves.

4. The device for detecting the accuracy of a photoelectric autocollimator lens according to claim 3, characterized in that: A plurality of bolt mounting holes are arranged on the top of the leveling platform, and the autocollimator, the aperture assembly and the reflector are detachably connected to the leveling platform via bolts.

5. The device for detecting the accuracy of a photoelectric autocollimator lens according to claim 3, characterized in that: Ear plates are respectively provided on both sides of the water tank, and through holes are provided on the ear plates. The water tank is connected to the measuring rope through the through holes. A water injection pipe is also provided on one side of the water tank, and the water injection port of the water injection pipe is higher than the top of the sleeve.

6. The device for detecting the accuracy of a photoelectric autocollimator lens according to claim 1, characterized in that: The rope pulling assembly includes a base plate, a rope clamp and a pulley. The rope clamp and the pulley are arranged on the base plate. The pulley is rotatably connected to the base plate. The rope clamps are respectively arranged on both sides of the pulley. The rope pulling assembly detachably fixes the measuring rope through the rope clamp, and the measuring rope is arranged to pass around the pulley.

7. The device for detecting the accuracy of a photoelectric autocollimator lens according to claim 6, characterized in that: The rope clamp comprises a pair of clamping jaws, the clamping jaws are rotatably connected to the base plate, and the measuring rope passes through between the clamping jaws.

8. The device for detecting the accuracy of a photoelectric autocollimator lens according to claim 6, characterized in that: The measuring rope also includes a connecting section, through which the end of the first section is connected to the end of the second section, the connecting section bypasses the pulley arrangement of the pull rope assembly, and the top end of the first section and the top end of the second section are wrapped around the pulley of another pull rope assembly.

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