Large-aperture reflector detection system based on detection tower

Abstract

The invention relates to the technical field of reflector detection, and particularly provides a large-aperture reflector detection system based on a detection tower, which comprises detection equipment, the detection tower, a detection light path, a reflector, a support device, a detection platform, an air floatation vibration isolation device and a temperature control system, the attitude of the reflector during detection is the same as the processing attitude, the horizontal design of the optical axis in the traditional detection process is changed into the vertical arrangement of the optical axis, the common-station design of reflector processing and detection is realized, the reflector processing and detection period is shortened, the risk in the reflector moving process is avoided, the reflector is supported in an air floating manner through the air floating vibration isolation device, and the detection precision is improved. Interference caused by vibration of an external environment is eliminated, and the influence of environmental factors such as sunlight and airflow on detection of the reflector is prevented through a temperature control system.

Description

Technical Field

[0001] The present invention belongs to the technical field of reflector detection, and particularly relates to a large-aperture reflector detection system based on a detection tower. Background Art

[0002] As the core optical element of modern large astronomical telescopes, the aperture of the primary mirror directly determines the resolution of the system. According to the Rayleigh criterion, the theoretical angular resolution of a telescopic system is inversely proportional to the clear aperture of the system and directly proportional to the operating wavelength. Increasing the aperture or the equivalent aperture is the only way to improve the angular resolution of a telescopic system.

[0003] High-precision detection is the basis and prerequisite for the manufacture of large-aperture reflectors. Currently, the general detection method is to set up an optical path in the direction perpendicular to the gravity of the reflector optical axis for detection, that is, a horizontal optical path. This method has a simple device setup, convenient optical path adjustment, and low technical difficulty. However, when detecting, it is necessary to adjust the reflector from the processing pose to the detection pose, and there is a risk of damaging the reflector during the process of transporting and rotating the reflector, and there is no systematic anti-disturbance device.

[0004] Currently, in the detection process of existing large-aperture reflectors, attention is paid to optimizing optical devices, optical path design, algorithms, etc. in optical detection. However, in the optical path setup, the optical path is still set up in the direction perpendicular to the gravity of the reflector optical axis for detection. Such a design results in different poses of the reflector in the processing stage and the detection stage. When detecting, it is necessary to move and flip the reflector to perform the detection, which poses a risk of damaging the reflector. In addition, the existing methods do not consider the interference of environmental factors enough, and environmental factors will cause large errors in the detection of ultra-large-aperture reflectors. Summary of the Invention

[0005] In view of this, the present invention aims to provide a large-aperture reflector detection system based on a detection tower. By changing the optical axis of the reflector detection optical path to the gravity direction through the detection tower, it is ensured that the detection posture of the reflector is the same as the processing posture, avoiding the problem that the reflector needs to be erected during detection, reducing the risk of moving and transporting the large-aperture reflector. At the same time, the interference problem of environmental factors during the detection process is reduced through the air-floating platform and temperature control device.

[0006] To achieve the above object, the technical solution of the present invention is realized as follows: The present invention provides a large-aperture reflector detection system based on a detection tower, including: A detection tower, which is arranged in the direction perpendicular to the reflecting surface when the reflector is in the processing posture, and is used to fix the components in the detection optical path when detecting the reflector, so that the posture of the reflector during detection is the same as the processing posture; A detection device, which is arranged at one end of the detection tower and is used to detect the reflector arranged at the other end of the detection tower.

[0007] Preferably, the detection device is an interferometer.

[0008] Preferably, the detection tower has a multi-layer envelope structure.

[0009] Preferably, it further includes: a support device, which is arranged on the non-reflecting surface side of the mirror for supporting and adjusting the mirror.

[0010] Preferably, the support device is a multi-point support system for controlling the gravity deformation error of the mirror to be less than , which represents the working wavelength of the detection device.

[0011] Preferably, it further includes: a detection platform, and the support device is fixed on the detection platform.

[0012] Preferably, it further includes: an air-bearing vibration isolation device, which is arranged below the detection platform, and the air-bearing vibration isolation device performs air-bearing support on the detection platform by generating an airbag.

[0013] Preferably, it further includes: a temperature control system, which includes a heat-insulating interlayer cover and a temperature adjustment device. The heat-insulating interlayer cover is arranged outside the detection device and the detection tower; The temperature adjustment device is used to monitor and adjust the temperature inside the detection tower, and forms an air circulation with the air inside the detection tower through the interlayer loop of the heat-insulating interlayer cover to monitor and adjust the temperature inside the heat-insulating detection tower in real time.

[0014] Compared with the prior art, the present invention can achieve the following beneficial effects: By designing the detection tower, the present invention changes the traditional detection optical path of the mirror from a horizontal state to the direction along gravity, making the attitude of the mirror during detection consistent with the processing attitude, realizing the co-station design of mirror processing and detection, eliminating the need for complex pose switching between processing and detection, reducing the time and workload of mirror movement and pose adjustment, effectively shortening the processing and detection cycle of the mirror, and enabling real-time detection of the mirror surface shape during the mirror surface processing, avoiding the complex operation of erecting the mirror. Due to the extremely large weight of the large-aperture mirror, the operation of erecting the mirror during the traditional mirror detection process is extremely difficult, not only requiring manual operation but also posing a great safety risk during the erection process. In addition, during detection in the gravity direction, due to the uniform distribution of the thermal gradient in the gravity direction, the influence of the temperature gradient and air density on the detection accuracy of the mirror can be greatly reduced.

[0015] Through the collaborative action of an air-floating vibration isolation device and a temperature control system, etc., the air-floating vibration isolation device separates the mirror from the support surface through an airbag, eliminating physical contact. Since the damping effect of the airbag can absorb external vibrations, it can effectively isolate vibrations and reduce friction, eliminating the detection interference caused by external environmental vibrations; the temperature control system isolates the mirror detection system from the outside, and can effectively prevent natural factors such as sunlight, air flow, and temperature from affecting the detection accuracy of the mirror, ensuring the stability of the environmental temperature during the detection process and controlling the gravity deformation error of the mirror within and effectively reducing the interference of environmental factors such as mechanical vibration, temperature gradient, and air turbulence, thereby significantly improving the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 is a schematic structural diagram of a large-aperture mirror detection system based on a detection tower according to an embodiment of the present invention; Figure 2 is a schematic diagram of anti-environmental interference of a large-aperture mirror detection system based on a detection tower according to an embodiment of the present invention.

[0017] The reference numerals therein include: detection device 1, detection tower 2, detection optical path 3, mirror 4, support device 5, detection platform 6, air-floating vibration isolation device 7, temperature control system 8. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and do not constitute a limitation to the present invention. Similar elements in different embodiments are labeled with related similar reference numerals. In the following embodiments, many details are described to make the present invention better understood. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, and methods. In some cases, some operations related to the present invention are not shown or described in the specification, which is to avoid the core part of the present invention being submerged by excessive description. For those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations according to the description in the specification and the general technical knowledge in the art.

[0019] It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other to form various implementation manners. At the same time, the steps or actions in the method description can also be adjusted in sequence or regulated in a manner obvious to those skilled in the art. Therefore, the various sequences in the specification and drawings are only for clearly describing a certain embodiment and do not mean that they are the necessary sequences, unless it is otherwise stated that a certain sequence must be followed.

[0020] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific circumstances.

[0022] The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0023] Please refer to Figure 1 and Figure 2, in an embodiment of the present invention, a large-aperture mirror detection system based on a detection tower is provided, which solves the problems of the risk of damage to the mirror 4 and large interference from environmental factors in the prior art when detecting large-aperture mirrors. The large-aperture mirror detection system includes: a detection device 1, a detection tower 2, a detection optical path 3, a support device 5, a detection platform 6, an air-floating vibration isolation device 7, and a temperature control system 8. Among them, the detection device 1 is the core processing part for mirror detection, and usually an interferometer is used to measure the surface shape accuracy of the mirror 4 by using the interference phenomenon of light. The detection device 1 integrates components such as a light source, a beam splitter, a reference mirror, and a CGH (hologram). The light source usually selects a laser light source to provide a stable interference light source, ensuring clear and stable interference fringes, which is convenient for subsequent image acquisition and analysis. The beam splitter divides the light beam emitted by the light source into two beams, namely a reference beam and a detection beam, which is convenient for subsequent interference. The reference mirror is used to receive the reference beam and reflect it back to the interferometer to interfere with the detection beam. The reference mirror is used as the detection reference for the mirror 4, and by comparing with the detection beam of the mirror 4, the surface shape of the mirror 4 is obtained. The CGH is used to modulate the phase and amplitude of the light wave, so that the detection beam can better match the shape and optical characteristics of the mirror 4, improving the detection accuracy and adaptability.

[0024] The detection tower 2 is the core improvement part of the embodiment of the present invention. In traditional mirror detection, the detection optical path is horizontally designed. When detecting, the mirror 4 needs to be moved and flipped from the processing pose to the detection pose. Usually, the mirror 4 needs to be erected manually, and this process is relatively complicated and accompanied by a high safety risk. And because the mirror needs to be detected multiple times during the processing, the mirror 4 needs to be erected repeatedly, which greatly affects the processing and detection technology of the mirror 4. Different from the conventional method, in the embodiment of the present invention, the detection tower 2 is used to turn the detection optical path from the horizontal direction of the optical axis to the gravity direction.

[0025] The detection tower 2 adopts a multi-layer envelope structure, enabling it to have high stiffness and stability and effectively support and fix each component in the detection optical path 3. Inside the detection tower 2, there are multiple frame layers and connection layers. Each frame layer is made of high-strength metal materials (such as aluminum alloy or steel) to ensure its structural strength and durability. The connection layers tightly connect each frame layer together by bolts, welding or other fastening methods to form an integral whole. As the support of the detection system, the main function of the detection tower 2 is to provide a stable installation foundation and support platform for the detection device 1 and the detection optical path 3. During the processing and detection of the mirror 4, the axis of the detection tower 2 is set in the direction perpendicular to the reflection surface when the mirror 4 is in the processing posture, and the optical elements required in the detection optical path 3 of the mirror 4 are fixed on the frame of the detection tower 2, making the optical axis of the detection optical path 3 along the gravity direction. This can make the posture of the mirror 4 during detection consistent with its posture during processing, avoiding the cycle extension and the risk of damage to the mirror 4 caused by switching the mirror 4 from the processing pose to the detection pose in the traditional method. In addition, during the detection in the gravity direction, since the temperature gradient and air flow distribution in the gravity direction are relatively symmetric, the influence of the temperature gradient and air turbulence on the detection accuracy can be minimized, thereby improving the accuracy and reliability of the detection results.

[0026] The detection device 1 is installed at the upper end of the detection tower 2, and the mirror 4 is arranged at the lower end of the detection tower 2. The reflection surface of the mirror 4 faces the detection device 1. To support and adjust the mirror 4, a support device 5 is also connected to the non-reflection surface side of the mirror 4. The support device 5 adopts a multi-point hydrostatic support system. By precisely controlling the pressure of each support point, the position and posture of the mirror 4 are finely adjusted to ensure the precise alignment of the mirror 4 with the detection optical path 3 and effectively reduce the tilt and distortion errors of the mirror 4, so that the deformation error of the mirror 4 caused by gravity is controlled within less than the specified range.

[0027] The lower surface of the support device 5 is installed on the detection platform 6. The detection platform 6 serves as the support foundation for the mirror 4 and the support device 5. During the simultaneous detection and processing, the detection platform 6 also serves as the processing platform for the mirror 4.

[0028] To reduce the influence of mechanical vibration on the processing and detection accuracy of the mirror 4 during the processing and detection process, an air-floating vibration isolation device 7 is also provided below the detection platform 6. The air-floating vibration isolation device 7 is arranged on the building foundation. The air-floating vibration isolation device 7 sprays high-pressure gas through nozzles or pores, and uses air bags to eliminate the physical contact between the detection platform 6 and the air-floating vibration isolation device 7, making the detection platform 6 in a nearly suspended state. Figure 2The arrow below the middle reflector 4 indicates the support for the reflector 4. Since the airbag can not only reduce friction but also has good damping characteristics, when the external environmental vibration is transmitted to the air-floating vibration isolation device 7, the airbag can absorb and dissipate the vibration energy, effectively isolate the propagation of the vibration, prevent the external vibration (such as ground vibration, vibration generated by the operation of nearby equipment, etc.) from interfering with the detection process, and ensure the stability of the detection platform 6.

[0029] In order to further reduce the impact of temperature changes on the detection accuracy during the detection process, the embodiment of the present invention further designs a temperature control system 8, which uses the temperature control system 8 to reduce the impact of natural factors such as sunlight, airflow, etc. that affect the overall temperature on the detection process, and also uses the temperature control system 8 to actively adjust and compensate the temperature of the detection environment, such as Figure 2 As shown, the right-side inclined arrow indicates factors such as external sunlight and thermal radiation of the detection tower 2, the flame indicates the temperature inside the detection tower 2, the cloud indicates the airflow inside the detection tower 2, and the wavy line indicates the vibration inside the detection tower 2. Specifically, the temperature control system 8 includes a thermal insulation interlayer cover and a temperature regulating device. The thermal insulation interlayer cover is arranged on the outside of the detection equipment 1 and the detection tower 2. Usually, an thermal insulation interlayer cover is used to completely arrange the detection equipment 1, the detection tower 2, the detection optical path 3, the reflector 4, the support device 5, the detection platform 6 and the air-floating vibration isolation device 7 in the thermal insulation interlayer cover. The thermal insulation interlayer cover can effectively resist wind and block sunlight, and try to avoid the influence of airflow and sunlight on the detection process. In addition, the temperature inside the detection tower 2 is detected and adjusted in real time through the temperature regulating device. Generally, the temperature regulating device includes a temperature measuring device and an air-conditioning system, and the temperature measuring device feeds back the detected temperature data to the air-conditioning system in real time. The interlayer of the thermal insulation interlayer cover serves as the air duct of the air conditioning system. The cold air or hot air of the air conditioning system enters the interlayer of the thermal insulation interlayer cover from the bottom of the detection tower 2, and then flows into the top of the detection tower 2 from the top of the interlayer, forming an air circulation to control the temperature inside the detection tower 2. When the temperature exceeds or falls below the set range, the air conditioning system automatically adjusts the cooling or heating amount to quickly restore the temperature to the ideal range, ensuring that the temperature fluctuation is controlled within a very small range.

[0030] Through the coordinated work of the detection tower 2, the air-floating vibration isolation device 7 and the temperature control system 8, a detection environment is formed that does not require the reflector 4 to be erected or flipped, and has high detection accuracy and strong stability, thereby achieving high-precision detection of the large-aperture reflector 4.

[0031] In short, the above description is only a preferred embodiment of this specification and is not intended to limit the protection scope of this specification. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this specification shall be included in the protection scope of this specification.

[0032] The systems, devices, modules or units described in one or more of the above embodiments may be specifically implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, the computer may be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or any combination of these devices.

[0033] It should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, commodity or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, commodity or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, commodity or device comprising the element.

[0034] Each embodiment in this specification is described in a progressive manner. The same or similar parts among the embodiments can be referred to each other, and the differences between each embodiment and other embodiments are emphasized. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method embodiment.

[0035] The above describes specific embodiments of this specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve the desired result. Additionally, the processes depicted in the figures do not necessarily require the particular order or sequential order shown to achieve the desired result. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

Claims

1. A large-aperture mirror detection system based on a detection tower, characterized in that Comprising: A detection tower, which is arranged in the vertical direction of the reflecting surface during the machining attitude of the mirror, and is used to fix the components in the detection optical path during the detection of the mirror, so that the attitude of the mirror during detection is the same as the machining attitude; A detection device, which is arranged at one end of the detection tower and is used to detect the mirror arranged at the other end of the detection tower.

2. The large-aperture mirror detection system based on a detection tower according to claim 1, wherein The detection device is an interferometer.

3. The large-aperture mirror detection system based on a detection tower according to claim 1, wherein, The detection tower is a multi-layer envelope structure.

4. The large-aperture mirror detection system based on a detection tower according to claim 1, characterized in that Also comprising: A support device, which is arranged on the non-reflecting surface side of the mirror and is used to support and adjust the mirror.

5. The large-aperture mirror detection system based on a detection tower according to claim 4, wherein The support device is a multi-point support system, which is used to control the gravity deformation error of the mirror to be less than , representing the working wavelength of the detection device.

6. The large-aperture mirror detection system based on a detection tower according to claim 4, characterized in that, Also comprising: A detection platform, and the support device is fixed on the detection platform.

7. The large-aperture mirror detection system based on a detection tower according to claim 6, wherein Also comprising: An air-floating vibration isolation device, which is arranged below the detection platform, and the air-floating vibration isolation device performs air-floating support on the detection platform through an airbag.

8. The large-aperture mirror detection system based on a detection tower according to claim 1, wherein, Also comprising: A temperature control system, the temperature control system includes a heat preservation interlayer cover and a temperature adjustment device, and the heat preservation interlayer cover is arranged outside the detection device and the detection tower; The temperature adjustment device is used to monitor and adjust the temperature inside the detection tower, and forms an air circulation with the air inside the detection tower through the interlayer loop of the heat preservation interlayer cover to monitor and adjust the temperature inside the detection tower in real time.

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