CN114739640A - Real-time alignment detection system for primary and secondary mirrors of telescope - Google Patents
Real-time alignment detection system for primary and secondary mirrors of telescope Download PDFInfo
- Publication number
- CN114739640A CN114739640A CN202210381024.0A CN202210381024A CN114739640A CN 114739640 A CN114739640 A CN 114739640A CN 202210381024 A CN202210381024 A CN 202210381024A CN 114739640 A CN114739640 A CN 114739640A
- Authority
- CN
- China
- Prior art keywords
- mirror
- small spherical
- light
- detection
- detected
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/0221—Testing optical properties by determining the optical axis or position of lenses
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
- G01B11/27—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/30—Collimators
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/32—Fiducial marks and measuring scales within the optical system
- G02B27/34—Fiducial marks and measuring scales within the optical system illuminated
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Telescopes (AREA)
Abstract
The invention belongs to the field of optical detection, and particularly relates to a real-time alignment detection system for a primary mirror and a secondary mirror of a telescope. According to the system, four small spherical reflectors are arranged at four positions of the upper part, the lower part, the left part and the right part of the edge area of the detected main mirror, the centers of the small spherical reflectors are all positioned at the focal points of the detected main mirror, and then the detection reference light reflected by the edges of the secondary mirrors can return in the original path after being reflected by the small spherical reflectors, so that an auto-collimation detection light path is formed. Four light beams returned by the spherule mirror enter the detector to form four light spots on the image surface, and the size of the alignment error of the primary mirror and the secondary mirror can be calculated by analyzing the position coordinate information of the four light spots distributed on the image surface. The system is suitable for real-time alignment detection of off-axis and on-axis telescopes, is not limited by the caliber size of the telescope, and the used small spherical reflector is simple and easy to obtain, so that the system has higher practicability.
Description
Technical Field
The invention belongs to the field of optical detection, and particularly relates to a real-time alignment detection system for a primary mirror and a secondary mirror of a telescope.
Background
Along with the increasing of the aperture of the telescope, the optical-mechanical structure becomes more complex, the influence of environmental factors on the telescope is more obvious, and the alignment of the primary mirror and the secondary mirror of the telescope is more difficult. If the alignment state of the primary mirror and the secondary mirror of the telescope is not good, the advantage of large caliber cannot be fully exerted, so that the real-time alignment of the primary mirror and the secondary mirror is guaranteed to have important significance, and real-time alignment detection is a prerequisite for realizing real-time alignment. For a large-aperture telescope, because the primary mirror is difficult to adjust and the secondary mirror is convenient to adjust, the alignment error of the primary mirror and the secondary mirror is caused by the change of the secondary mirror, namely the alignment error of the secondary mirror relative to the primary mirror, and the alignment error can be decomposed into six terms, namely the translation error of the secondary mirror along X, Y, Z direction and the rotation error of the secondary mirror around X, Y, Z direction, generally assuming that the primary mirror is always in an ideal position and has no alignment error.
The simplest real-time alignment detection is to directly detect a star or a target by using a telescope, take light emitted by the star or the target as detection reference light, and map alignment errors of primary and secondary mirrors of the telescope by using the difference between an actual detection result and a theoretical detection result. This kind of mode does not need extra ray apparatus structure, and the influence to telescope working light path is minimum, but its real-time relatively poor and very easily receive external environment's interference, thus only be applicable to the not high and relatively stable condition of external environment of real-time requirement.
In order to improve the real-time performance of detection and reduce the influence of external factors on the detection result, an internal reference light source is added in a subsequent detection system, and then real-time alignment detection is realized by constructing an auto-collimation light path, as shown in fig. 1. In the system shown in fig. 1(a), a plane mirror with a size slightly larger than that of the secondary mirror is arranged behind the secondary mirror, and the reference light returns to the primary path after being reflected by the plane mirror to form an auto-collimation light path to realize alignment detection. The detection system has higher detection precision and abundant detection information, but the self-stabilization of the plane mirror is a big difficulty and generally needs to be installed on an inertial stabilization platform, and the plane mirror and the stabilization mechanism thereof increase the system obscuration and reduce the detection efficiency of the system. In addition, the method is not suitable for an off-axis system, so the application range is limited. The system shown in fig. 1(b) forms a self-collimating optical path by fixedly mounting an annular plane mirror on a telescope tube. The system can stabilize the annular plane reflector without adding an inertia stabilizing mechanism, and the reference light is an edge annular light beam and can be conveniently separated from the working light beam, so that a complex film-coated light splitting element is not needed, and the method is also suitable for detection of an off-axis system. However, the size of the annular plane mirror of the system is increased when the aperture of the telescope is increased, so the application range of the system is limited by the aperture of the telescope. In the system shown in fig. 1(c), a plane mirror is fixedly connected behind the secondary mirror, and the reference light is an annular light beam and directly enters the plane mirror without passing through the primary mirror and the secondary mirror. Its advantages are simple optical path, easy implementation, and no reflection of centrifugal error and attitude information of primary mirror. The system shown in fig. 1(d) adopts an annular aspheric mirror matched with the surface shape of the primary mirror, so that the reference light can return to form an auto-collimation light path after entering the primary mirror through the reflector. The detection system has high detection precision, but the surface shape of the reflecting mirror matched with the main mirror is generally a high-order aspherical mirror, so the processing and detection difficulty is high, and the implementation cost is high.
In summary, although there are various real-time alignment detection systems for telescopes, all detection systems have their disadvantages and limitations, some have low detection accuracy, some are too complex, and some are limited by structural size or machining level. In short, the comprehensive performance and universality are not high, and the invention provides a primary mirror and secondary mirror real-time alignment detection system which is simpler and more practical and has excellent comprehensive performance.
Disclosure of Invention
The invention mainly aims to overcome the defects of the existing alignment detection system and provides a real-time alignment detection system for a primary mirror and a secondary mirror of a telescope, so that the real-time alignment detection system for the primary mirror and the secondary mirror of the telescope is simpler and more practical.
In order to achieve the purpose, the invention provides the following technical scheme:
a real-time alignment detection system for primary and secondary mirrors of a telescope comprises a secondary mirror to be detected, a small spherical reflector, a primary mirror to be detected, a light splitter, a reference light source and a detector;
the reference light source and the detector are placed behind the main mirror to be detected, the four small spherical reflectors are respectively placed at four positions, namely the upper position, the lower position, the left position and the right position, of the edge area of the main mirror to be detected, and the spherical centers of the spherical surfaces where the small spherical reflectors are located at the focal points of the main mirror to be detected;
the reference light emitted by the reference light source is reflected by the light splitter and the secondary mirror to be measured and then enters the small spherical reflector, the four beams of light emitted by the small spherical reflector can return in the original path, and then enter the detector through the light splitter to be imaged into four light spots; when the primary mirror to be measured and the secondary mirror to be measured are completely aligned, the four light spots coincide with one point at the center of the detector, and when the alignment error exists between the primary mirror to be measured and the secondary mirror to be measured, the four light spots do not coincide with one point at the center of the detector any more.
Furthermore, the detection system can detect an off-axis system and a coaxial system and is not limited by the caliber size of the telescope.
Furthermore, the detection reference light does not pass through the detected primary mirror, but only passes through the secondary mirror and the spherical mirror to form an auto-collimation detection light path.
Furthermore, the four small spherical reflectors are fixedly connected with the measured main mirror.
Furthermore, the curvature radiuses of the small spherical reflectors can be equal or unequal, and as long as the spherical center of the spherical surface where the small spherical reflectors are located is located at the focus of the detected main mirror, the small spherical reflectors can form an auto-collimation detection light path to realize alignment detection.
Furthermore, when the alignment error exists between the primary mirror to be measured and the secondary mirror to be measured, the four light spots can present different distribution forms, and the size of each alignment error is obtained by analyzing the position coordinate information of the light spots.
In the invention, the curvature radiuses of the four small spherical reflectors can be equal, and can also be designed differently according to the installation requirement. The four spherical reflectors and the secondary mirror can form a four-way auto-collimation light path, so that the alignment state of the secondary mirror relative to the primary mirror can be detected. When the primary mirror and the secondary mirror are completely aligned, reference light emitted by the light source is reflected by the light splitter and the secondary mirror and then enters the small spherical mirror, four beams of light can return in the original path, then enters the detector through the light splitter to form four light spots, and theoretically, the four light spots at the moment are coincided with one point at the center of the detector. When the primary mirror and the secondary mirror have alignment errors, the four light spots are not superposed on one point at the center of the detector any more, but can present different separation states, and the alignment errors and the sizes of the alignment errors of the primary mirror and the secondary mirror can be judged according to the separation states presented by the four light spots. The small spherical reflector can be fixedly connected with the main mirror in a bonding mode, and the main mirror is made of materials with high thermal stability, so that the small spherical reflector and the main mirror can be well ensured to be relatively stable, namely the four small spherical reflectors replace the main mirror, and the alignment error of the secondary mirror and the four small spherical reflectors is actually detected, so that the alignment error of the secondary mirror and the main mirror is indirectly detected. Although the system has indirect measurement error because the reference light does not pass through the main mirror, the measurement error is mainly the system error when the small spherical mirror and the main mirror are installed, and the detection precision can be further improved by reducing or even eliminating the error through calibration.
Compared with the existing detection system, the invention has the following advantages: the system has small obstruction to a telescope system, and an additional optical-mechanical structure is light and small, so that the influence on the system work is small; the system is not limited by the caliber of the telescope, and can be applied to coaxial or off-axis telescope systems with various calibers; the small-caliber reflector used in the system is a spherical reflector, and is simple and easy to obtain, so that the practicability is higher.
Drawings
FIG. 1 is a schematic diagram of a four-telescope alignment detection system.
FIG. 2 is a schematic diagram of the alignment detection system for primary and secondary mirrors according to the present invention.
In the figure: 1. the device comprises a secondary mirror to be detected, 2 a small spherical reflector, 3 a primary mirror to be detected, 4 a light splitting device, 5 a reference light source, 6 and a detector.
FIG. 3 is a simulation model and coordinate definition in Zmax optics software.
FIG. 4 shows the distribution of light spots on the image plane when different single alignment errors exist.
Detailed Description
In order to make the purpose and technical solution of the present invention more clear, the following description is made in detail by simulating an actual off-axis telescope system with reference to the embodiments.
The composition and the relationship of the whole detection system will be described with reference to fig. 2 and 3. The detection system consists of a secondary mirror (1) to be detected, a small spherical reflector (2), a primary mirror (3) to be detected, a light splitting device (4), a reference light source (5) and a detector (6). The small spherical reflectors are arranged at four positions of the edge of the main mirror to be measured, and are fixedly connected with the main mirror to be measured, and the centers of the spheres where the four small spherical reflectors are arranged are all located at the focus of the main mirror to be measured. For the convenience of simulation calculation, the four small spherical mirrors have the same curvature radius, namely the four small spherical mirrors are installed in a common spherical surface. The reference light source and the detector are arranged behind the primary mirror to be detected, and the emission and the receiving of the reference light are realized through the light splitting device. Specifically, reference light emitted by the reference light source is reflected by the light splitting device and the secondary mirror to be detected and then enters the small spherical reflector, four beams of light emitted by the small spherical reflector can return in the original path, and then enters the detector through the light splitting device to be imaged into four light spots; when the primary mirror to be measured and the secondary mirror to be measured are completely aligned, the four light spots coincide with one point at the center of the detector, and when the alignment error exists between the primary mirror to be measured and the secondary mirror to be measured, the four light spots do not coincide with one point at the center of the detector any more.
The simulation model of the actual system and the definition of its coordinate system will be explained with reference to fig. 3. In the simulation system, the off-axis amount of a main mirror is 920mm, the original entrance pupil is 1150mm, the diameters of four small spherical mirrors are 40mm, and the central coordinates of the four small spherical mirrors are (0, 1515), (0, 325), (595, 920) and (-595, 920). The coordinate system of the system conforms to the principle of a right-hand system, the origin of the system is positioned at the vertex of the secondary mirror, the secondary mirror points to the primary mirror along the optical axis direction in the Z direction, and the optical axis points to the far end of the off-axis along the off-axis direction in the Y direction. An ideal lens is used for representing the detector for imaging, four beams of reference light returned by the four small spherical reflectors are imaged on an image surface, when the primary mirror and the secondary mirror have no alignment error, the image is taken as a light spot at the center, and when the secondary mirror has a translation error of 0.1mm in the Z direction relative to the primary mirror, the image is split into four light spots distributed up, down, left and right, which are respectively numbered as (I) and (II).
Finally, the principle of real-time alignment detection is further explained with reference to the simulation result of fig. 4. Fig. 4 shows the distribution of four light spots on the target surface of the detector in the presence of a single alignment error Δ X of 0.02mm, Δ Y of 0.02mm, Δ Z of 0.02mm, Θ X of 0.001 °, Θ Y of 0.001 °, and Θ Z of 0.001 °, wherein Δ X, Δ Y, Δ Z are translational errors, Θ X, Θ Y, and Θ Z are rotational errors. Finally, the sizes of six alignment errors delta X, delta Y, delta Z, theta X, theta Y and theta Z can be calculated by eight detectable quantities of coordinate information of the four light spots on the image surface, namely (X1, Y1), phi (X2, Y2), phi (X3, Y3) and phi (X4, Y4).
In conclusion, the detection system for realizing alignment detection of the primary mirror and the secondary mirror by forming the auto-collimation light path by fixedly connecting the small spherical reflector on the primary mirror has the advantages of simplicity, reliability, high practicability and wide application range. The principle and feasibility of the invention are verified through simulation, and other similar principles and configurations are considered to be the protection scope of the invention.
Claims (6)
1. A real-time alignment detection system for primary and secondary mirrors of a telescope is characterized by comprising a secondary mirror to be detected, a small spherical reflector, a primary mirror to be detected, a light splitter, a reference light source and a detector;
the reference light source and the detector are placed behind the main mirror to be detected, the four small spherical reflectors are respectively placed at four positions, namely the upper position, the lower position, the left position and the right position, of the edge area of the main mirror to be detected, and the spherical centers of the spherical surfaces where the four small spherical reflectors are located are all located at the focus of the main mirror to be detected;
the reference light emitted by the reference light source is reflected by the light splitter and the secondary mirror to be detected and then enters the small spherical reflector, the four beams of light reflected by the small spherical reflector can return in the original path, and then enter the detector through the light splitter to be imaged into four light spots; when the primary mirror to be measured and the secondary mirror to be measured are completely aligned, the four light spots coincide with one point at the center of the detector, and when the alignment error exists between the primary mirror to be measured and the secondary mirror to be measured, the four light spots do not coincide with one point at the center of the detector any more.
2. The detection system of claim 1, wherein: the detection system can detect both an off-axis system and a coaxial system and is not limited by the caliber size of a telescope.
3. The detection system of claim 1, wherein: the detection reference light does not pass through the primary mirror to be detected, but only passes through the secondary mirror to be detected and the small spherical reflector to form an auto-collimation detection light path.
4. The detection system of claim 1, wherein: and the four small spherical reflectors are fixedly connected with the measured main mirror.
5. The detection system of claim 1, wherein: the curvature radiuses of the small spherical reflectors can be equal or unequal, and as long as the spherical center of the spherical surface where the small spherical reflectors are located is located at the focus of the detected main mirror, the small spherical reflectors can form an auto-collimation detection light path to realize alignment detection.
6. The detection system of claim 1, wherein: when alignment errors exist between the primary mirror to be measured and the secondary mirror to be measured, the four light spots can present different distribution forms, and the size of each alignment error is obtained by analyzing the position coordinate information of the light spots.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210381024.0A CN114739640B (en) | 2022-04-12 | 2022-04-12 | Real-time alignment detection system for primary mirror and secondary mirror of telescope |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210381024.0A CN114739640B (en) | 2022-04-12 | 2022-04-12 | Real-time alignment detection system for primary mirror and secondary mirror of telescope |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114739640A true CN114739640A (en) | 2022-07-12 |
| CN114739640B CN114739640B (en) | 2022-12-30 |
Family
ID=82282552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210381024.0A Active CN114739640B (en) | 2022-04-12 | 2022-04-12 | Real-time alignment detection system for primary mirror and secondary mirror of telescope |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114739640B (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5282016A (en) * | 1992-07-29 | 1994-01-25 | Hughes Aircraft Company | Optical alignment by use of arrays of reflective or diffractive optical elements and detectors |
| US6226121B1 (en) * | 2000-03-16 | 2001-05-01 | Trw Inc. | Optical telescope system with discontinuous pupil corrector and segmented primary mirror with spherical segments |
| CN101419062A (en) * | 2008-12-04 | 2009-04-29 | 中国科学院光电技术研究所 | Large caliber hyperboloid secondary mirror detecting system |
| CN101650157A (en) * | 2009-09-18 | 2010-02-17 | 中国科学院长春光学精密机械与物理研究所 | Detecting method and detecting device of surface-shape error of double curved surface convex reflecting mirror |
| US20100177315A1 (en) * | 2007-09-25 | 2010-07-15 | Nikon Corporation | Alignment device and method for optical system |
| WO2012169935A2 (en) * | 2011-06-06 | 2012-12-13 | Open Joint Stock Company "Scientific And Production Association" State Institute Of Applied Optics" (Ojsc "Npo "Gipo") | Device for aligning a two-mirror centered optical system |
| CN102981254A (en) * | 2012-12-27 | 2013-03-20 | 中国科学院长春光学精密机械与物理研究所 | Coaxial aspheric surface four-reflecting mirror optical system with long focal length short structure |
| CN104393932A (en) * | 2014-11-20 | 2015-03-04 | 中国科学院光电技术研究所 | Real-time correction method for optical axis of telescope of quantum communication ground station |
| US10859348B1 (en) * | 2018-07-02 | 2020-12-08 | Northrop Grumman Systems Corporation | System for active telescope alignment, focus and beam control |
| CN113917669A (en) * | 2021-09-08 | 2022-01-11 | 中国科学院西安光学精密机械研究所 | Off-axis reflection type telescopic system and installation and adjustment detection device and method thereof |
| CN114076670A (en) * | 2022-01-19 | 2022-02-22 | 中国科学院西安光学精密机械研究所 | Splicing main mirror common-phase error detection method and system and storage medium |
| CN114216659A (en) * | 2021-12-15 | 2022-03-22 | 合肥工业大学 | System and method for measuring parallelism of large-caliber long-focus optical axis |
-
2022
- 2022-04-12 CN CN202210381024.0A patent/CN114739640B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5282016A (en) * | 1992-07-29 | 1994-01-25 | Hughes Aircraft Company | Optical alignment by use of arrays of reflective or diffractive optical elements and detectors |
| US6226121B1 (en) * | 2000-03-16 | 2001-05-01 | Trw Inc. | Optical telescope system with discontinuous pupil corrector and segmented primary mirror with spherical segments |
| US20100177315A1 (en) * | 2007-09-25 | 2010-07-15 | Nikon Corporation | Alignment device and method for optical system |
| CN101419062A (en) * | 2008-12-04 | 2009-04-29 | 中国科学院光电技术研究所 | Large caliber hyperboloid secondary mirror detecting system |
| CN101650157A (en) * | 2009-09-18 | 2010-02-17 | 中国科学院长春光学精密机械与物理研究所 | Detecting method and detecting device of surface-shape error of double curved surface convex reflecting mirror |
| WO2012169935A2 (en) * | 2011-06-06 | 2012-12-13 | Open Joint Stock Company "Scientific And Production Association" State Institute Of Applied Optics" (Ojsc "Npo "Gipo") | Device for aligning a two-mirror centered optical system |
| CN102981254A (en) * | 2012-12-27 | 2013-03-20 | 中国科学院长春光学精密机械与物理研究所 | Coaxial aspheric surface four-reflecting mirror optical system with long focal length short structure |
| CN104393932A (en) * | 2014-11-20 | 2015-03-04 | 中国科学院光电技术研究所 | Real-time correction method for optical axis of telescope of quantum communication ground station |
| US10859348B1 (en) * | 2018-07-02 | 2020-12-08 | Northrop Grumman Systems Corporation | System for active telescope alignment, focus and beam control |
| CN113917669A (en) * | 2021-09-08 | 2022-01-11 | 中国科学院西安光学精密机械研究所 | Off-axis reflection type telescopic system and installation and adjustment detection device and method thereof |
| CN114216659A (en) * | 2021-12-15 | 2022-03-22 | 合肥工业大学 | System and method for measuring parallelism of large-caliber long-focus optical axis |
| CN114076670A (en) * | 2022-01-19 | 2022-02-22 | 中国科学院西安光学精密机械研究所 | Splicing main mirror common-phase error detection method and system and storage medium |
Non-Patent Citations (5)
| Title |
|---|
| PRASANNA DESHMUKH 等: "Primary Mirror Active Control System Simulation of Prototype Segmented Mirror Telescope", 《2017 INDIAN CONTROL CONFERENCE (ICC)》 * |
| 刘柱: "离轴望远镜失调误差检测技术研究", 《中国博士学位论文全文数据库》 * |
| 文新荣 等: "望远镜主副镜实时自校正系统", 《中国机械工程》 * |
| 曲慧东: "空间望远镜光机结构设计及力学特性研究", 《中国优秀硕士学位论文全文数据库》 * |
| 韩娟等: "大口径望远系统中主次镜系统的装调方法", 《中国激光》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114739640B (en) | 2022-12-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111929879B (en) | Small-F-number oblique-axis large-view-field off-axis three-mirror system and assembling and adjusting method thereof | |
| CN108957726B (en) | Quick adjusting method for axisymmetric telescope by taking image plane as reference | |
| CN110207588B (en) | Method for assembling and adjusting optical vertex aiming device of pyramid prism | |
| CN105157578B (en) | Measure off axis paraboloid mirror principal reflection mirror amount and the system and method for off-axis angle off axis | |
| CN108506893B (en) | Method for assembling and adjusting optical system of collimating solar simulator | |
| WO2013013488A1 (en) | Optical system structure of laser range finder | |
| CN109579779B (en) | High-precision high-frequency-response anti-interference large-working-distance auto-collimation device and method | |
| US20220082697A1 (en) | Laser radar | |
| US20150185324A1 (en) | Laser radar tracking systems | |
| CN114415389A (en) | Optical-mechanical system adjustment method with multiple reflectors | |
| CN110987371B (en) | Centering system and method for large-caliber concave aspheric surface | |
| US6327038B1 (en) | Linear and angular retroreflecting interferometric alignment target | |
| CN116047785A (en) | Precise calibration device and calibration method for optical axis of parabolic reflector | |
| CN115166932A (en) | Optical axis adjusting method of large-caliber long-focus-distance axial optical system | |
| CN109471252B (en) | Complex optical scene space motion simulation device | |
| CN114739640B (en) | Real-time alignment detection system for primary mirror and secondary mirror of telescope | |
| CN108007424B (en) | Multi-view secondary reflector attitude detection system and detection method thereof | |
| KR20180071127A (en) | Alignment Method for Off-axis Reflective Optical System | |
| CN109253867B (en) | Optical system focal length measuring system and method | |
| CN205485006U (en) | 360 degree total reflection prism | |
| CN105092212B (en) | Array corner reflector pointing accuracy measuring system and method | |
| CN108398104B (en) | photoelectric dynamic angle measuring device capable of reducing random error and method thereof | |
| CN100582678C (en) | Off-axis rotational symmetry type laser trigone displacement transducer | |
| CN103217066A (en) | Double-auto-collimation optical system checking and regulating tube | |
| CN105629430B (en) | 360 degree of total reflection prisms and its aligning method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |