Off-axis type multimode detection device

Abstract

The utility model relates to an off-axis type multi-mode detection device which comprises a rack, a rotary table, a hollow circumferential support and a hollow rotary shaft. The primary mirror receives and scans external light, and the secondary mirror is arranged in an emergent light path of the primary mirror at an angle of 45 degrees and reflects the light to the detector. The device supports the secondary mirror to be used as a spectroscope or a total reflection mirror, and multi-mode detection is achieved. The image processing unit processes detector signals, the master control board manages signal input and output, and the collector ring ensures normal signal connection when the rotary table rotates. According to the design, space utilization is optimized, and detection efficiency and flexibility are improved.

Description

Technical Field

[0001] This utility model belongs to the field of flight target detection technology, and specifically relates to an off-axis multi-mode detection device. Background Technology

[0002] There are currently many challenges in detecting and tracking drone targets and birds flying over airports. In terms of radar detection, radar has limitations; it cannot react to all moving targets. Drones are generally made of balsa wood and composite materials, while birds are organic organisms. These materials have light transmission properties, making them less detectable. Drones are only made of metal components such as motors, engines, batteries, and wires, and their small size significantly reduces their radar cross-section, lowering the detection distance and probability, and shortening ground reaction time.

[0003] In the field of photoelectric detection, currently, multiple detection sources are set on a single platform to integrate the signals from multiple sources. However, in conventional solutions, this platform often only produces a reciprocating oscillating platform with a large mass, slow oscillation speed, and long signal interval, which is insufficient for detecting fast-moving targets.

[0004] Furthermore, the existing detection technologies are independent of each other, with different optical apertures and asymmetrical axes. It is also difficult to achieve complete consistency in phase angle and elevation angle between different detection sources. Therefore, additional control systems are needed to convert and integrate signals from different detection sources. The sharing of results from different detection sources requires a back-end computer to integrate data based on azimuth angle. Moreover, the detector receiving unit must be set on a rotating platform or rotating pod, which makes electrical connections difficult and restricts the possibility of simultaneous multi-channel detection.

[0005] The series of detection device schemes previously applied for by this utility model applicant, as well as a multispectral 3D rapid scanning detection and tracking device, achieve coaxial transmission or reception of multiple spectra. The detectors involved are fixedly mounted on a base. Although the technical solutions are feasible, there are some limitations.

[0006] ① The central hole shaft diameter is small, the electrical slip ring diameter is small, and the beam splitter or reflector is located on the central axis of the rotating base. Thus, multiple detectors are arranged sequentially along the central optical path and the optical axes of the slip ring and beam splitter. Therefore, the distance between the detector and the beam splitter and the primary mirror is relatively large. Considering the actual requirements of the detector's field of view (2° remote staring tracking, 6° / 10° scanning detection), the longer the distance, the greater the beam expansion. Therefore, the corresponding size of the beam splitter and primary mirror needs to be larger, which increases the requirements for lens coating and the cost is also very high. According to the design of the beam splitter and primary mirror of the previous scheme, the lens diameter is greater than 220mm, and the coating processing price of a single beam splitter is 90,000-110,000 yuan.

[0007] ② The beam splitter or beam splitter is set on the center line of the central hole axis. Regardless of whether the detector is located on the turntable or below the turntable, the objective lens of the detector is set on the outside of the beam splitter or beam splitter. Therefore, the turntable or base needs to have a larger diameter so that the space can accommodate the detector. This results in a large optical device. According to the design and manufacturing of this utility model, the actual size of the device is 700mm in diameter. This same diameter also makes the device very heavy, which seriously affects the application of the solution.

[0008] ③ Especially in the application of multimode detectors, the combination of multiple detectors corresponding to ultraviolet light, visible light, infrared light, and laser, as well as the addition of the laser emission path of the impact, makes the optical path of beam transmission longer and longer, which makes the lens diameter larger and larger, the device diameter larger and larger, and the device weight larger and heavier.

[0009] ④ In the above situations, in order to reduce the size of the lens and the diameter of the device, it is often necessary to redesign the optical path of the detector. It is hoped that a smaller objective lens diameter and a 90° bend in the detector can reduce the size of the lens and the diameter of the device. This is feasible. However, redesigning the detector, such as visible light lenses and cameras, infrared lenses and cameras, often has high design and manufacturing costs, long processing and testing cycles, and poor performance in terms of indicators and usage compared to commercially available cameras.

[0010] ⑤ To solve the above problems, large-diameter electrical slip rings could be used. However, in practice, it has been found that the larger the slip ring diameter, the heavier it is, and the number of energized circuits decreases. A slip ring with a 4-wire power supply and a 3-wire bus can weigh more than 20 kilograms, not including network communication. Modern cameras often output via network cable. If the slip ring were to add network transmission, firstly, its anti-interference capability would be poor, resulting in a decrease in network transmission speed; secondly, the price would be very high. Therefore, it is necessary to consider communicating the camera's image signal via wireless WIFI in the electrical design, which increases the design difficulty, design cost, debugging difficulty, and reduces anti-interference capability.

[0011] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0012] The purpose of this invention is to provide an off-axis multimode detection device, thereby improving the technical defects mentioned in the background art.

[0013] An off-axis multimode detection device includes a frame and a hollow circumferential support and a hollow rotating shaft vertically arranged between the frame and a turntable. The frame is connected to the hollow circumferential support, and the turntable is fixedly connected to the hollow rotating shaft. A turntable motor for driving the relative movement of the two is arranged between the frame and the hollow rotating shaft. A primary mirror and a secondary mirror are arranged on the turntable.

[0014] The primary mirror receives external light. Driven by the primary mirror motor and the turntable motor, the primary mirror scans the external space and receives external field of view light.

[0015] The secondary mirror is set at a 45° angle in the output light path of the primary mirror. The center line of the beam between the secondary mirror and the primary mirror is parallel to the plane of the turntable. The primary mirror receives external light and reflects it to the secondary mirror, and then reflects it to the detector. The center line of the reflected beam is parallel to the central axis of the turntable.

[0016] The hollow space is formed by a hollow circumferential support and a hollow rotating shaft connected to each other by bearings. At least one detector is installed in the hollow space.

[0017] The secondary mirror is either a beam splitter or a total reflection mirror;

[0018] When the secondary mirror is a beam splitter, it transmits the light beam of the set band and reflects the light beam of other bands, so that the light beams are respectively sent to the first detector and the second detector located in the hollow space and the turntable.

[0019] When the secondary mirror is a total reflection mirror, the secondary mirror reflects the light beam to the second beam splitter and then splits the light beam to the first and second detectors in the hollow space;

[0020] The image processing unit is set on the turntable or in the hollow space and is responsible for processing the image signals of the detector. At least one detector rotates with the turntable and is directly connected to the signal of the image processing unit. The first detector and the second detector correspond to different detection bands to form multimode detection.

[0021] The main control board is mounted on the rack and is used to receive input signals and output detection signals;

[0022] The bus ring is an electrical sliding connector used to maintain a normal signal connection between the image processing unit and the main control unit fixed on the frame when the turntable rotates. The bus ring is located on the frame at the bottom of the hollow rotating shaft, and its fixed ring is connected to the frame. A small shaft is coaxially provided at the bottom of the hollow rotating shaft, and the small shaft is connected to the movable ring of the bus ring.

[0023] When the small shaft is a solid shaft, the small shaft passes through the inner hole of the busbar ring and is connected to the inner hole. The inner hole of the busbar ring acts as a movable ring, and the frame is connected to the outer ring of the busbar ring. The outer ring of the busbar ring acts as a fixed ring.

[0024] When the small shaft is a hollow shaft, the inner hole of the small shaft is connected to the outer ring of the busbar ring, and the outer ring of the busbar ring is a movable ring. The frame is connected to the inner hole of the busbar ring, and the inner hole of the busbar ring is a fixed ring.

[0025] The further defined technical solution of this utility model is as follows:

[0026] Furthermore, the secondary mirror is either offset and fixed outside the central axis of the turntable, or set on the central axis of the turntable. The light beam from the external space is reflected by the primary mirror, and then passes through the secondary mirror to reach the first detector set in the hollow space and the second detector set on the turntable respectively. The center line of the beam of the first detector passes through the center of the secondary mirror, and the objective lens of the second detector is located near the central axis of the turntable, and the center line of the beam of its detector passes near the center of the secondary mirror.

[0027] Alternatively, the light beam from the external space is reflected by the primary mirror, then passes through the secondary mirror, and reaches the first and second detectors set in the hollow space. The first and second detectors are located on both sides of the central axis of the turntable.

[0028] The beams from the first detector and the second detector both pass through the primary mirror for external detection, and their center lines are parallel and almost coincident.

[0029] Furthermore, the input / output signals of the first and second detectors are all converged on the image processing unit for signal concentration and fusion. The space between the image processing unit and the detector is relatively stationary, and the communication and image signal cables between the detector and the image processing unit are directly connected.

[0030] Furthermore, the turntable also includes a millimeter-wave antenna and a millimeter-wave signal processing board. A human-machine interface control board is installed on the rack. The image processing unit and the millimeter-wave host are connected to the main control board via a bus loop signal.

[0031] Furthermore, the millimeter-wave antenna is located on the back of the primary mirror, which is made of plastic, ceramic, or other materials that allow millimeter waves to pass through. The primary mirror has an optical reflective coating on the beam reflecting surface of the detector.

[0032] Furthermore, a millimeter-wave antenna is installed on the back of the main mirror, which is driven by the main mirror to achieve ±90° reciprocating swing. It is directly connected to the millimeter-wave host by cable. In addition to the image processing unit and the millimeter-wave host being connected to the main control board through a bus ring signal cable, it also includes a wireless connection module.

[0033] Furthermore, the millimeter-wave antenna is connected to the millimeter-wave host, which includes a millimeter-wave signal processing and control board; the millimeter-wave antenna is a waveguide antenna or a microstrip antenna, and the shape of the millimeter-wave antenna is consistent with that of the main mirror; the detector includes millimeter waves, and the beam and the millimeter-wave beam are coaxial.

[0034] Furthermore, a laser is also installed on the turntable, and the laser beam outputs either through the vicinity of the center of the secondary mirror or through the vicinity of the edge of the secondary mirror's circumference;

[0035] When the laser beam passes through the secondary mirror, the secondary mirror is provided with a laser beam through-hole;

[0036] When the laser beam passes outside the circumference of the off-axis mirror, the secondary mirror is elliptical, and the laser beam passes outside the minor axis of the ellipse.

[0037] Furthermore, the main control board also includes a wireless connection module, which is responsible for communication with operators, display, and command reception. The main control board is connected via a bus loop signal cable and also includes a wireless connection module to communicate with the image processing unit and the millimeter-wave host.

[0038] With this setup, when the detector's image signal is sent to the image processing unit and the millimeter-wave signal enters the millimeter-wave host, no image transmission occurs between the main control board and the target plane when no target appears. Only when a target appears will the image processing unit or the millimeter-wave host send an image signal to the main control board.

[0039] Furthermore, the operating center frequency of the millimeter-wave antenna is preferably one of 35GHz, 95GHz, and 140GHz, and the H-plane half-power beamwidth of its millimeter-wave beam is greater than or equal to α.

[0040] Furthermore, the first detector and the second detector correspond to different wavelength bands and are selected from one or more of infrared light detectors, visible light detectors and laser detectors. The field of view of the detectors is independently adjustable, and the field of view range of the detectors is α: 0.2°-15°.

[0041] Furthermore, infrared light detectors, visible light detectors, and laser detectors are commercially available infrared light cameras, visible light cameras, and laser cameras.

[0042] Furthermore, the diameter d1 of the first detector objective corresponds to the diameter D1 of the beam splitter, and the diameter d2 of the second detector objective corresponds to the largest values ​​for the diameters D2 of the reflecting mirror, D3 of the secondary mirror, and D4 of the primary mirror when α=15°, respectively:

[0043] The center point of the reflecting mirror is L2 away from the objective lens, and the diameter of the mirror is D2: D2≈1.414*(d2+2*L2*tan(α / 2)).

[0044] Beam splitter 2, the center point is at a distance L1 from the objective lens of the first detector, and at a distance L3 from the reflector. The lens diameter D1: D1≈1.414*(d1+2*L1*tan(α / 2)) or D1≈1.414*(D2+2*L3*tan(α / 2)), D1 is the larger of the two.

[0045] The secondary mirror is L4 away from the second beam splitter, and the mirror diameter is D3: D3≈1.414*(D1+2*L4*tan(α / 2)).

[0046] The primary mirror is L5, and the distance to the eccentric beam splitter is D4: D4≈1.414*(D3+2*L5*tan(α / 2)).

[0047] The advantages of the solution are as follows:

[0048] ①Although the diameter of the central hole shaft is large in this case, the detector is placed inside the central hole shaft, so it does not actually occupy space, and the spatial size of the device is relatively small.

[0049] ② In this case, the off-axis mirror is set off eccentrically, which makes the distance between each detector and the beam splitter short. Under the same field of view, a smaller lens diameter is achieved, which significantly reduces the difficulty of lens production and processing and reduces lens cost.

[0050] ③ In the case of multimode detector applications, the combination of multiple detectors corresponding to ultraviolet light, visible light, infrared light, and laser, as well as the addition of the laser emission path, although the optical path for beam transmission will be longer, compared with the aforementioned comparative schemes, the optical path required in this case is shorter, and the corresponding size is smaller, which significantly reduces the weight of the device and increases the adaptability of the application.

[0051] ④ This case can use commercially available visible light lenses and cameras, infrared lenses and cameras, which have lower design and processing costs and shorter processing and testing cycles compared to other solutions, and can ensure good performance indicators and application effects.

[0052] ⑤ In this case, image processing is concentrated on the turntable, which can effectively reduce the number of signal channels transmitted through the bus ring. Especially in the case of multiple control signals and orientation signal feedback, it can effectively reduce the height of the bus ring, thereby reducing the volume and weight of the bus ring, and thus reducing the weight of the entire device.

[0053] ⑥ In this case, although multiple detectors and millimeter-wave detectors rotate with the turntable, the image processing board is also set on the turntable, so that there is no relative rotation between the detectors and the image processing board. Instead, a direct cable connection is used, which ensures the reliability of the connection between the detectors and the signal processing board and increases the anti-interference capability.

[0054] ⑦ In the working state set in this case, when no target is detected, the image processing board and the millimeter-wave host do not transmit data to the human-machine interface control board, thereby reducing the total amount of signals that the solution needs to transmit, reducing the design difficulty, reducing the number of storage units, reducing the size of the electrical board, and improving electrical reliability.

[0055] ⑧ This case can directly utilize the adjustable field of view of commercially available cameras, and by changing the field of view from large to small, it can quickly achieve a smooth transition between multiple modes: scanning detection → tracking detection → (scanning + tracking detection). The millimeter-wave detection device used is also a relatively mature technical solution. Attached Figure Description

[0056] Figure 1a , Figure 6 , Figure 7 This is a schematic diagram of Example 1;

[0057] Figure 1b This is a schematic diagram of Example 2;

[0058] Figure 1c This is a schematic diagram of Example 3;

[0059] Figure 1d This is a schematic diagram of Example 4;

[0060] Figure 2a This is a schematic diagram of Example 5;

[0061] Figure 2b This is a schematic diagram of Example 6;

[0062] Figure 3 and Figure 4 Schematic diagram of laser installation

[0063] Figure 5 This is a schematic diagram of the H-plane half-power beamwidth of a millimeter-wave beam. Detailed Implementation

[0064] The specific embodiments of this utility model are described in detail below, but it should be understood that the protection scope of this utility model is not limited to the specific embodiments.

[0065] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0066] Example 1

[0067] An off-axis multimode detection device includes a frame and a hollow circumferential support and a hollow rotating shaft vertically arranged between the frame and a turntable. The frame is connected to the hollow circumferential support, and the turntable is fixedly connected to the hollow rotating shaft. A turntable motor for driving the relative movement of the two is arranged between the frame and the hollow rotating shaft. A primary mirror and a secondary mirror are arranged on the turntable.

[0068] The primary mirror receives external light. Driven by the primary mirror motor and the turntable motor, the primary mirror scans the external space and receives external field of view light.

[0069] The secondary mirror is set at a 45° angle in the output light path of the primary mirror. The center line of the beam between the secondary mirror and the primary mirror is parallel to the plane of the turntable. The primary mirror receives external light and reflects it to the secondary mirror, and then reflects it to the detector. The center line of the reflected beam is parallel to the central axis of the turntable.

[0070] The hollow space is formed by a hollow circumferential support and a hollow rotating shaft connected to each other by bearings. At least one detector is installed in the hollow space.

[0071] When the secondary mirror is a beam splitter, it transmits the light beam of the set band and reflects the light beam of other bands, so that the light beams are respectively sent to the first detector and the second detector located in the hollow space and the turntable.

[0072] The image processing unit is set on the turntable or in the hollow space and is responsible for processing the image signals of the detector. At least one detector rotates with the turntable and is directly connected to the signal of the image processing unit. The first detector and the second detector correspond to different detection bands to form multimode detection.

[0073] The main control board is mounted on the rack and is used to receive input signals and output detection signals;

[0074] The bus ring is an electrical sliding connector used to maintain a normal signal connection between the image processing unit and the main control unit fixed on the frame when the turntable rotates. The bus ring is located on the frame at the bottom of the hollow rotating shaft, and its fixed ring is connected to the frame. A small shaft is coaxially provided at the bottom of the hollow rotating shaft, and the small shaft is connected to the movable ring of the bus ring.

[0075] When the small shaft is a solid shaft, it passes through the inner hole of the busbar ring and is connected to the inner hole. The inner hole of the busbar ring acts as a movable ring, and the frame is connected to the outer ring of the busbar ring. The outer ring of the busbar ring acts as a fixed ring.

[0076] The secondary mirror is either offset and fixed outside the central axis of the turntable, or set on the central axis of the turntable. The light beam from the external space is reflected by the primary mirror, and then passes through the secondary mirror to reach the first detector set in the hollow space and the second detector set on the turntable respectively. The center line of the beam of the first detector passes through the center of the secondary mirror, and the objective lens of the second detector is located on the turntable, and the center line of the beam of its detector passes through the vicinity of the center of the secondary mirror.

[0077] Alternatively, a beam of light from the external space may be reflected by the primary mirror, then pass through the secondary mirror, and reach the first and second detectors located in the hollow space.

[0078] The beams from the first detector and the second detector both pass through the primary mirror for external detection, and their center lines are parallel and almost coincident.

[0079] The input / output signals of the first and second detectors are all gathered on the image processing unit for signal concentration and fusion. The space between the image processing unit and the detectors is relatively stationary, and the communication and image signal cables between the detectors and the image processing unit are directly connected.

[0080] The first and second detectors correspond to different wavelength bands and are selected from one or more of infrared light detectors, visible light detectors, and laser detectors. The field of view of the detectors is independently adjustable, and the field of view range of the detectors is α: 0.2°-15°.

[0081] Infrared light detectors, visible light detectors, and laser detectors are commercially available infrared light cameras, visible light cameras, and laser cameras.

[0082] The diameter d1 of the first detector objective lens corresponds to the diameter D1 of the beam splitter. The diameter d2 of the second detector objective lens corresponds to the largest values ​​for the diameters D2 of the reflecting mirror, D3 of the secondary mirror, and D4 of the primary mirror when α=15°. These values ​​are as follows:

[0083] The center point of the reflecting mirror is L2 away from the objective lens, and the diameter of the mirror is D2: D2≈1.414*(d2+2*L2*tan(α / 2)).

[0084] Beam splitter 2, the center point is at a distance L1 from the objective lens of the first detector, and at a distance L3 from the reflector. The lens diameter D1: D1≈1.414*(d1+2*L1*tan(α / 2)) or D1≈1.414*(D2+2*L3*tan(α / 2)), D1 is the larger of the two.

[0085] The secondary mirror is L4 away from the second beam splitter, and the mirror diameter is D3: D3≈1.414*(D1+2*L4*tan(α / 2)).

[0086] The primary mirror is L5, and the distance to the eccentric beam splitter is D4: D4≈1.414*(D3+2*L5*tan(α / 2)).

[0087] Example 2

[0088] An off-axis multimode detection device includes a frame, a hollow circumferential support and a hollow rotating shaft vertically disposed between the frame and a turntable. The frame is connected to the hollow circumferential support, and the turntable is fixedly connected to the hollow rotating shaft. A turntable motor for driving the relative movement of the frame and the hollow rotating shaft is disposed between them.

[0089] The primary and secondary mirrors are mounted on the turntable;

[0090] The primary mirror receives external light. Driven by the primary mirror motor and the turntable motor, the primary mirror scans the external space and receives external field of view light.

[0091] The secondary mirror is set at a 45° angle in the output light path of the primary mirror. The center line of the beam between the secondary mirror and the primary mirror is parallel to the plane of the turntable. The primary mirror receives external light and reflects it to the secondary mirror, and then reflects it to the detector. The center line of the reflected beam is parallel to the central axis of the turntable.

[0092] The hollow space is formed by a hollow circumferential support and a hollow rotating shaft connected to each other by bearings. At least one detector is installed in the hollow space.

[0093] When the secondary mirror is a total reflection mirror, the secondary mirror reflects the light beam to the second beam splitter and then splits the light beam to the first and second detectors in the hollow space;

[0094] The image processing unit is set on the turntable or in the hollow space and is responsible for processing the image signals of the detector. At least one detector rotates with the turntable and is directly connected to the signal of the image processing unit. The first detector and the second detector correspond to different detection bands to form multimode detection.

[0095] The main control board is mounted on the rack and is used to receive input signals and output detection signals;

[0096] The bus ring is an electrical sliding connector used to maintain a normal signal connection between the image processing unit and the main control unit fixed on the frame when the turntable rotates. The bus ring is located on the frame at the bottom of the hollow rotating shaft, and its fixed ring is connected to the frame. A small shaft is coaxially provided at the bottom of the hollow rotating shaft, and the small shaft is connected to the movable ring of the bus ring.

[0097] When the small shaft is a solid shaft, the small shaft passes through the inner hole of the busbar ring and is connected to the inner hole. The inner hole of the busbar ring acts as a movable ring, and the frame is connected to the outer ring of the busbar ring. The outer ring of the busbar ring acts as a fixed ring.

[0098] The secondary mirror is either offset and fixed outside the central axis of the turntable, or set on the central axis of the turntable. The light beam from the external space is reflected by the primary mirror, and then passes through the secondary mirror to reach the first detector set in the hollow space and the second detector set on the turntable respectively. The center line of the beam of the first detector passes through the center of the secondary mirror, and the objective lens of the second detector is located on the turntable, and the center line of the beam of its detector passes through the vicinity of the center of the secondary mirror.

[0099] Alternatively, a beam of light from the external space may be reflected by the primary mirror, then pass through the secondary mirror, and reach the first and second detectors located in the hollow space.

[0100] The beams from the first detector and the second detector both pass through the primary mirror for external detection, and their center lines are parallel and almost coincident.

[0101] The input / output signals of the first and second detectors are all gathered on the image processing unit for signal concentration and fusion. The space between the image processing unit and the detectors is relatively stationary, and the communication and image signal cables between the detectors and the image processing unit are directly connected.

[0102] The first and second detectors correspond to different wavelength bands and are selected from one or more of infrared light detectors, visible light detectors, and laser detectors. The field of view of the detectors is independently adjustable, and the field of view range of the detectors is α: 0.2°-15°.

[0103] Infrared light detectors, visible light detectors, and laser detectors are commercially available infrared light cameras, visible light cameras, and laser cameras.

[0104] Example 3

[0105] An off-axis multimode detection device includes a frame and a hollow circumferential support and a hollow rotating shaft vertically arranged between the frame and a turntable. The frame is connected to the hollow circumferential support, and the turntable is fixedly connected to the hollow rotating shaft. A turntable motor for driving the relative movement of the two is arranged between the frame and the hollow rotating shaft. A primary mirror and a secondary mirror are arranged on the turntable.

[0106] The primary mirror receives external light. Driven by the primary mirror motor and the turntable motor, the primary mirror scans the external space and receives external field of view light.

[0107] The secondary mirror is set at a 45° angle in the output light path of the primary mirror. The center line of the beam between the secondary mirror and the primary mirror is parallel to the plane of the turntable. The primary mirror receives external light and reflects it to the secondary mirror, and then reflects it to the detector. The center line of the reflected beam is parallel to the central axis of the turntable.

[0108] The hollow space is formed by a hollow circumferential support and a hollow rotating shaft connected to each other by bearings. At least one detector is installed in the hollow space.

[0109] When the secondary mirror is a beam splitter, it transmits the light beam of the set band and reflects the light beam of other bands, so that the light beams are respectively sent to the first detector and the second detector located in the hollow space and the turntable.

[0110] The image processing unit is set on the turntable or in the hollow space and is responsible for processing the image signals of the detector. At least one detector rotates with the turntable and is directly connected to the signal of the image processing unit. The first detector and the second detector correspond to different detection bands to form multimode detection.

[0111] The main control board is mounted on the rack and is used to receive input signals and output detection signals;

[0112] The bus ring is an electrical sliding connector used to maintain a normal signal connection between the image processing unit and the main control unit fixed on the frame when the turntable rotates. The bus ring is located on the frame at the bottom of the hollow rotating shaft, and its fixed ring is connected to the frame. A small shaft is coaxially provided at the bottom of the hollow rotating shaft, and the small shaft is connected to the movable ring of the bus ring.

[0113] When the small shaft is hollow, the inner hole of the small shaft is connected to the outer ring of the busbar ring, and the outer ring of the busbar ring is a movable ring. The frame is connected to the inner hole of the busbar ring, and the inner hole of the busbar ring is a fixed ring.

[0114] The secondary mirror is either offset and fixed outside the central axis of the turntable, or set on the central axis of the turntable. The light beam from the external space is reflected by the primary mirror, and then passes through the secondary mirror to reach the first detector set in the hollow space and the second detector set on the turntable respectively. The center line of the beam of the first detector passes through the center of the secondary mirror, and the objective lens of the second detector is located on the turntable, and the center line of the beam of its detector passes through the vicinity of the center of the secondary mirror.

[0115] Alternatively, a beam of light from the external space may be reflected by the primary mirror, then pass through the secondary mirror, and reach the first and second detectors located in the hollow space.

[0116] The beams from the first detector and the second detector both pass through the primary mirror for external detection, and their center lines are parallel and almost coincident.

[0117] The input / output signals of the first and second detectors are all gathered on the image processing unit for signal concentration and fusion. The space between the image processing unit and the detectors is relatively stationary, and the communication and image signal cables between the detectors and the image processing unit are directly connected.

[0118] The first and second detectors correspond to different wavelength bands and are selected from one or more of infrared light detectors, visible light detectors, and laser detectors. The field of view of the detectors is independently adjustable, and the field of view range of the detectors is α: 0.2°-15°.

[0119] Infrared light detectors, visible light detectors, and laser detectors are commercially available infrared light cameras, visible light cameras, and laser cameras.

[0120] Example 4

[0121] An off-axis multimode detection device includes a frame, a hollow circumferential support and a hollow rotating shaft vertically disposed between the frame and a turntable. The frame is connected to the hollow circumferential support, and the turntable is fixedly connected to the hollow rotating shaft. A turntable motor for driving the relative movement of the frame and the hollow rotating shaft is disposed between them.

[0122] The primary and secondary mirrors are mounted on the turntable;

[0123] The primary mirror receives external light. Driven by the primary mirror motor and the turntable motor, the primary mirror scans the external space and receives external field of view light.

[0124] The secondary mirror is set at a 45° angle in the output light path of the primary mirror. The center line of the beam between the secondary mirror and the primary mirror is parallel to the plane of the turntable. The primary mirror receives external light and reflects it to the secondary mirror, and then reflects it to the detector. The center line of the reflected beam is parallel to the central axis of the turntable.

[0125] The hollow space is formed by a hollow circumferential support and a hollow rotating shaft connected to each other by bearings. At least one detector is installed in the hollow space.

[0126] When the secondary mirror is a total reflection mirror, the secondary mirror reflects the light beam to the second beam splitter and then splits the light beam to the first and second detectors in the hollow space;

[0127] The image processing unit is set on the turntable or in the hollow space and is responsible for processing the image signals of the detector. At least one detector rotates with the turntable and is directly connected to the signal of the image processing unit. The first detector and the second detector correspond to different detection bands to form multimode detection.

[0128] The main control board is mounted on the rack and is used to receive input signals and output detection signals;

[0129] The bus ring is an electrical sliding connector used to maintain a normal signal connection between the image processing unit and the main control unit fixed on the frame when the turntable rotates. The bus ring is located on the frame at the bottom of the hollow rotating shaft, and its fixed ring is connected to the frame. A small shaft is coaxially provided at the bottom of the hollow rotating shaft, and the small shaft is connected to the movable ring of the bus ring.

[0130] When the small shaft is hollow, the inner hole of the small shaft is connected to the outer ring of the busbar ring, and the outer ring of the busbar ring is a movable ring. The frame is connected to the inner hole of the busbar ring, and the inner hole of the busbar ring is a fixed ring.

[0131] The secondary mirror is either offset and fixed outside the central axis of the turntable, or set on the central axis of the turntable. The light beam from the external space is reflected by the primary mirror, and then passes through the secondary mirror to reach the first detector set in the hollow space and the second detector set on the turntable respectively. The center line of the beam of the first detector passes through the center of the secondary mirror, and the objective lens of the second detector is located on the turntable, and the center line of the beam of its detector passes through the vicinity of the center of the secondary mirror.

[0132] Alternatively, a beam of light from the external space may be reflected by the primary mirror, then pass through the secondary mirror, and reach the first and second detectors located in the hollow space.

[0133] The beams from the first detector and the second detector both pass through the primary mirror for external detection, and their center lines are parallel and almost coincident.

[0134] The input / output signals of the first and second detectors are all gathered on the image processing unit for signal concentration and fusion. The space between the image processing unit and the detectors is relatively stationary, and the communication and image signal cables between the detectors and the image processing unit are directly connected.

[0135] The first and second detectors correspond to different wavelength bands and are selected from one or more of infrared light detectors, visible light detectors, and laser detectors. The field of view of the detectors is independently adjustable, and the field of view range of the detectors is α: 0.2°-15°.

[0136] Infrared light detectors, visible light detectors, and laser detectors are commercially available infrared light cameras, visible light cameras, and laser cameras.

[0137] Example 5

[0138] An off-axis multimode detection device includes a frame, a hollow circumferential support and a hollow rotating shaft vertically disposed between the frame and a turntable. The frame is connected to the hollow circumferential support, and the turntable is fixedly connected to the hollow rotating shaft. A turntable motor for driving the relative movement of the frame and the hollow rotating shaft is disposed between them.

[0139] The primary and secondary mirrors are mounted on the turntable;

[0140] The primary mirror receives external light. Driven by the primary mirror motor and the turntable motor, the primary mirror scans the external space and receives external field of view light.

[0141] The secondary mirror is set at a 45° angle in the output light path of the primary mirror. The center line of the beam between the secondary mirror and the primary mirror is parallel to the plane of the turntable. The primary mirror receives external light and reflects it to the secondary mirror, and then reflects it to the detector. The center line of the reflected beam is parallel to the central axis of the turntable.

[0142] The hollow space is formed by a hollow circumferential support and a hollow rotating shaft connected to each other by bearings. At least one detector is installed in the hollow space.

[0143] When the secondary mirror is a beam splitter, it transmits the light beam of the set band and reflects the light beam of other bands, so that the light beams are respectively sent to the first detector and the second detector located in the hollow space and the turntable.

[0144] The image processing unit is set on the turntable or in the hollow space and is responsible for processing the image signals of the detector. At least one detector rotates with the turntable and is directly connected to the signal of the image processing unit. The first detector and the second detector correspond to different detection bands to form multimode detection.

[0145] The main control board is mounted on the rack and is used to receive input signals and output detection signals;

[0146] The bus ring is an electrical sliding connector used to maintain a normal signal connection between the image processing unit and the main control unit fixed on the frame when the turntable rotates. The bus ring is located on the frame at the bottom of the hollow rotating shaft, and its fixed ring is connected to the frame. A small shaft is coaxially provided at the bottom of the hollow rotating shaft, and the small shaft is connected to the movable ring of the bus ring.

[0147] When the small shaft is a solid shaft, the small shaft passes through the inner hole of the busbar ring and is connected to the inner hole. The inner hole of the busbar ring acts as a movable ring, and the frame is connected to the outer ring of the busbar ring. The outer ring of the busbar ring acts as a fixed ring.

[0148] The secondary mirror is either offset and fixed outside the central axis of the turntable, or set on the central axis of the turntable. The light beam from the external space is reflected by the primary mirror, and then passes through the secondary mirror to reach the first detector set in the hollow space and the second detector set on the turntable respectively. The center line of the beam of the first detector passes through the center of the secondary mirror, and the objective lens of the second detector is located on the turntable, and the center line of the beam of its detector passes through the vicinity of the center of the secondary mirror.

[0149] Alternatively, a beam of light from the external space may be reflected by the primary mirror, then pass through the secondary mirror, and reach the first and second detectors located in the hollow space.

[0150] The beams from the first detector and the second detector both pass through the primary mirror for external detection, and their center lines are parallel and almost coincident.

[0151] The input / output signals of the first and second detectors are all gathered on the image processing unit for signal concentration and fusion. The space between the image processing unit and the detectors is relatively stationary, and the communication and image signal cables between the detectors and the image processing unit are directly connected.

[0152] The turntable also includes a millimeter-wave antenna and a millimeter-wave signal processing board. A human-machine interface control board is installed on the rack. The image processing unit and the millimeter-wave host are connected to the main control board via a bus loop signal.

[0153] The millimeter-wave antenna is located on the back of the primary mirror, which is made of plastic, ceramic, or other materials that allow millimeter waves to pass through. The primary mirror has an optical reflective coating on the beam reflecting surface of the detector.

[0154] The back of the main mirror is equipped with a millimeter-wave antenna, which is driven by the main mirror to achieve ±90° reciprocating swing. It is directly connected to the millimeter-wave host via cable. In addition to the image processing unit and the millimeter-wave host being connected to the main control board via a bus ring signal cable, it also includes a wireless connection module.

[0155] The millimeter-wave antenna is connected to the millimeter-wave host, which includes a millimeter-wave signal processing and control board; the millimeter-wave antenna is a waveguide antenna or a microstrip antenna, and the shape of the millimeter-wave antenna is consistent with that of the main mirror; the detector includes millimeter waves, and the beam is coaxial with the millimeter-wave beam.

[0156] The main control board also includes a wireless connection module, which is responsible for communication with operators, display, and command reception. The main control board is connected via a bus ring signal cable and also includes a wireless connection module to communicate with the image processing unit and the millimeter-wave host.

[0157] With this setup, when the detector's image signal is sent to the image processing unit and the millimeter-wave signal enters the millimeter-wave host, no image transmission occurs between the main control board and the target plane when no target appears. Only when a target appears will the image processing unit or the millimeter-wave host send an image signal to the main control board.

[0158] The preferred operating center frequency of the millimeter-wave antenna is one of 35GHz, 95GHz, or 140GHz, and the H-plane half-power beamwidth of its millimeter-wave beam is greater than or equal to α.

[0159] The first and second detectors correspond to different wavelength bands and are selected from one or more of infrared light detectors, visible light detectors, and laser detectors. The field of view of the detectors is independently adjustable, and the field of view range of the detectors is α: 0.2°-15°.

[0160] Infrared light detectors, visible light detectors, and laser detectors are commercially available infrared light cameras, visible light cameras, and laser cameras.

[0161] Example 6

[0162] An off-axis multimode detection device includes a frame and a hollow circumferential support and a hollow rotating shaft vertically arranged between the frame and a turntable. The frame is connected to the hollow circumferential support, and the turntable is fixedly connected to the hollow rotating shaft. A turntable motor for driving the relative movement of the two is arranged between the frame and the hollow rotating shaft. A primary mirror and a secondary mirror are arranged on the turntable.

[0163] The primary mirror receives external light. Driven by the primary mirror motor and the turntable motor, the primary mirror scans the external space and receives external field of view light.

[0164] The secondary mirror is set at a 45° angle in the output light path of the primary mirror. The center line of the beam between the secondary mirror and the primary mirror is parallel to the plane of the turntable. The primary mirror receives external light and reflects it to the secondary mirror, and then reflects it to the detector. The center line of the reflected beam is parallel to the central axis of the turntable.

[0165] The hollow space is formed by a hollow circumferential support and a hollow rotating shaft connected to each other by bearings. At least one detector is installed in the hollow space.

[0166] When the secondary mirror is a total reflection mirror, the secondary mirror reflects the light beam to the second beam splitter and then splits the light beam to the first and second detectors in the hollow space;

[0167] The image processing unit is set on the turntable or in the hollow space and is responsible for processing the image signals of the detector. At least one detector rotates with the turntable and is directly connected to the signal of the image processing unit. The first detector and the second detector correspond to different detection bands to form multimode detection.

[0168] The main control board is mounted on the rack and is used to receive input signals and output detection signals;

[0169] The bus ring is an electrical sliding connector used to maintain a normal signal connection between the image processing unit and the main control unit fixed on the frame when the turntable rotates. The bus ring is located on the frame at the bottom of the hollow rotating shaft, and its fixed ring is connected to the frame. A small shaft is coaxially provided at the bottom of the hollow rotating shaft, and the small shaft is connected to the movable ring of the bus ring.

[0170] When the small shaft is a solid shaft, the small shaft passes through the inner hole of the busbar ring and is connected to the inner hole. The inner hole of the busbar ring acts as a movable ring, and the frame is connected to the outer ring of the busbar ring. The outer ring of the busbar ring acts as a fixed ring.

[0171] The secondary mirror is either offset and fixed outside the central axis of the turntable, or set on the central axis of the turntable. The light beam from the external space is reflected by the primary mirror, and then passes through the secondary mirror to reach the first detector set in the hollow space and the second detector set on the turntable respectively. The center line of the beam of the first detector passes through the center of the secondary mirror, and the objective lens of the second detector is located on the turntable, and the center line of the beam of its detector passes through the vicinity of the center of the secondary mirror.

[0172] Alternatively, a beam of light from the external space may be reflected by the primary mirror, then pass through the secondary mirror, and reach the first and second detectors located in the hollow space.

[0173] The beams from the first detector and the second detector both pass through the primary mirror for external detection, and their center lines are parallel and almost coincident.

[0174] The input / output signals of the first and second detectors are all gathered on the image processing unit for signal concentration and fusion. The space between the image processing unit and the detectors is relatively stationary, and the communication and image signal cables between the detectors and the image processing unit are directly connected.

[0175] The turntable also includes a millimeter-wave antenna and a millimeter-wave signal processing board. A human-machine interface control board is installed on the rack. The image processing unit and the millimeter-wave host are connected to the main control board via a bus loop signal.

[0176] The millimeter-wave antenna is located on the back of the primary mirror, which is made of plastic, ceramic, or other materials that allow millimeter waves to pass through. The primary mirror has an optical reflective coating on the beam reflecting surface of the detector.

[0177] The back of the main mirror is equipped with a millimeter-wave antenna, which is driven by the main mirror to achieve ±90° reciprocating swing. It is directly connected to the millimeter-wave host via cable. In addition to the image processing unit and the millimeter-wave host being connected to the main control board via a bus ring signal cable, it also includes a wireless connection module.

[0178] The millimeter-wave antenna is connected to the millimeter-wave host, which includes a millimeter-wave signal processing and control board; the millimeter-wave antenna is a waveguide antenna or a microstrip antenna, and the shape of the millimeter-wave antenna is consistent with that of the main mirror; the detector includes millimeter waves, and the beam is coaxial with the millimeter-wave beam.

[0179] The main control board also includes a wireless connection module, which is responsible for communication with operators, display, and command reception. The main control board is connected via a bus ring signal cable and also includes a wireless connection module to communicate with the image processing unit and the millimeter-wave host.

[0180] With this setup, when the detector's image signal is sent to the image processing unit and the millimeter-wave signal enters the millimeter-wave host, no image transmission occurs between the main control board and the target plane when no target appears. Only when a target appears will the image processing unit or the millimeter-wave host send an image signal to the main control board.

[0181] The preferred operating center frequency of the millimeter-wave antenna is one of 35GHz, 95GHz, or 140GHz, and the H-plane half-power beamwidth of its millimeter-wave beam is greater than or equal to α.

[0182] The first and second detectors correspond to different wavelength bands and are selected from one or more of infrared light detectors, visible light detectors, and laser detectors. The field of view of the detectors is independently adjustable, and the field of view range of the detectors is α: 0.2°-15°.

[0183] Infrared light detectors, visible light detectors, and laser detectors are commercially available infrared light cameras, visible light cameras, and laser cameras.

[0184] Example 7

[0185] As a variation of Embodiment 1, Embodiment 2, Embodiment 3, Embodiment 4, Embodiment 5, or Embodiment 6, the main structure is the same as that of Embodiment 1, Embodiment 2, Embodiment 3, Embodiment 4, Embodiment 5, or Embodiment 6. The main difference is that a laser is also provided on the turntable. The laser output beam either passes through the vicinity of the center of the secondary mirror or passes through the vicinity of the edge of the circumference of the secondary mirror.

[0186] When the laser beam passes through the secondary mirror, the secondary mirror is provided with a laser beam through-hole;

[0187] When the laser beam passes outside the circumference of the off-axis mirror, the secondary mirror is elliptical, and the laser beam passes outside the minor axis of the ellipse.

[0188] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the present invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the present invention, as well as various different choices and variations. The scope of the present invention is intended to be defined by the claims and their equivalents.

Claims

1. An off-axis multimode detection device, comprising a frame and a hollow circumferential support and a hollow rotating shaft vertically disposed between the frame and a turntable, wherein the frame is connected to the hollow circumferential support, the turntable is fixedly connected to the hollow rotating shaft, and a turntable motor for driving the relative movement of the frame and the hollow rotating shaft is disposed between the frame and the hollow rotating shaft, characterized in that... : The primary and secondary mirrors are mounted on the turntable; The main mirror receives external light. The main mirror is driven by the main mirror motor and together with the turntable motor to realize the scanning of the external space and the reception of external field of view light. The secondary mirror is set at a 45° angle in the output light path of the primary mirror. The center line of the light beam between the secondary mirror and the primary mirror is parallel to the plane of the turntable. The primary mirror receives external light and reflects it to the secondary mirror, and then reflects it to the detector. The center line of the reflected light beam is parallel to the central axis of the turntable. The hollow space is formed by a hollow circumferential support and a hollow rotating shaft connected to each other by bearings, and at least one detector is installed in the hollow space. The secondary mirror is a beam splitter or a total reflection mirror; When the secondary mirror is a beam splitter, it transmits the light beam of the set band and reflects the light beam of other bands, so that the light beams are respectively sent to the first detector and the second detector located in the hollow space and the turntable. When the secondary mirror is a total reflection mirror, the secondary mirror reflects the light beam to the second beam splitter and then splits the light beam to the first and second detectors in the hollow space; The image processing unit is set on the turntable or in the hollow space and is responsible for processing the image signals of the detector. The at least one detector rotates with the turntable and is directly connected to the signal of the image processing unit. The first detector and the second detector correspond to different detection bands to form multimode detection. The main control board is mounted on the rack and is used to receive input signals and output detection signals; The bus ring is an electrical sliding connector used to maintain a normal signal connection between the image processing unit and the main control unit fixed on the frame when the turntable rotates. The bus ring is located on the frame at the bottom of the hollow rotating shaft, and its fixed ring is connected to the frame. A small shaft is coaxially arranged at the bottom of the hollow rotating shaft, and the small shaft is connected to the movable ring of the bus ring. When the small shaft is a solid shaft, the small shaft passes through the inner hole of the busbar ring and is connected to the inner hole. The inner hole of the busbar ring is a movable ring. The frame is connected to the outer ring of the busbar ring, and the outer ring of the busbar ring is a fixed ring. When the small shaft is a hollow shaft, the inner hole of the small shaft is connected to the outer ring of the busbar ring, and the outer ring of the busbar ring is a movable ring. The frame is connected to the inner hole of the busbar ring, and the inner hole of the busbar ring is a fixed ring.

2. The off-axis multimode detection device according to claim 1, characterized in that: The secondary mirror is either offset and fixed outside the central axis of the turntable, or it is set on the central axis of the turntable. The light beam from the external space is reflected by the primary mirror, and then passes through the secondary mirror to reach the first detector set in the hollow space and the second detector set on the turntable. The center line of the light beam of the first detector passes through the center of the secondary mirror, and the objective lens of the second detector is located on the turntable, and the center line of the light beam of its detector passes through the vicinity of the center of the secondary mirror. Alternatively, a beam of light from the external space may be reflected by the primary mirror, then pass through the secondary mirror, and reach the first and second detectors located within the hollow space. The beams from the first detector and the second detector both pass through the main mirror for external detection, and their center lines are parallel and almost coincident.

3. The off-axis multimode detection device according to claim 1, characterized in that: The input / output signals of the first detector and the second detector are both gathered on the image processing unit for signal concentration and fusion. The space between the image processing unit and the detector is relatively stationary, and the communication and image signal cables between the detector and the image processing unit are directly connected.

4. The off-axis multimode detection device according to claim 1, characterized in that: The turntable also includes a millimeter-wave antenna and a millimeter-wave signal processing board. A human-machine interface control board is installed on the rack. The image processing unit and the millimeter-wave host are connected to the main control board via a bus loop signal.

5. The off-axis multimode detection device according to claim 4, characterized in that: The millimeter-wave antenna is located on the back of the main mirror, which is made of plastic, ceramic, or other materials that allow millimeter waves to pass through. The main mirror has an optical reflective coating on the beam reflecting surface of the detector.

6. The off-axis multimode detection device according to claim 5, characterized in that: A millimeter-wave antenna is installed on the back of the main mirror, which is driven by the main mirror to achieve ±90° reciprocating swing. It is directly connected to the millimeter-wave host via cable. In addition to the image processing unit and the millimeter-wave host being connected to the main control board via a bus loop signal cable, it also includes a wireless connection module.

7. The off-axis multimode detection device according to claim 4, 5, or 6, characterized in that: The millimeter-wave antenna is connected to the millimeter-wave host, which includes a millimeter-wave signal processing and control board; the millimeter-wave antenna is a waveguide antenna or a microstrip antenna, and the shape of the millimeter-wave antenna is consistent with that of the main mirror; the detector includes millimeter waves, and the beam and the millimeter-wave beam are coaxial.

8. The off-axis multimode detection device according to claim 1, characterized in that: A laser is also provided on the turntable. The laser output beam either passes through the vicinity of the center of the secondary mirror or passes through the vicinity of the edge of the circumference of the secondary mirror. When the laser beam passes through the secondary mirror, the secondary mirror is provided with a laser beam through-hole; When the laser beam passes outside the circumference of the off-axis mirror, the secondary mirror is elliptical, and the laser beam passes outside the minor axis of the ellipse.

9. The off-axis multimode detection device according to claim 6, characterized in that: The main control board also includes a wireless connection module, which is responsible for communication with the operator, display, and receiving commands. The main control board is connected via a bus ring signal cable and also includes a wireless connection module to communicate with the image processing unit and the millimeter-wave host. With this setup, when the detector's image signal is sent to the image processing unit and the millimeter-wave signal enters the millimeter-wave host, no image transmission occurs between the main control board and the target plane when no target appears. Only when a target appears will the image processing unit or the millimeter-wave host send an image signal to the main control board.

10. The off-axis multimode detection device according to claim 4, 5, or 6, characterized in that: The millimeter-wave antenna operates at a center frequency of 35GHz, 95GHz, or 140GHz, and its H-plane half-power beamwidth is greater than or equal to α.

11. The off-axis multimode detection device according to claim 1, characterized in that: The first detector and the second detector correspond to different wavelength bands and are selected from one or more of infrared light detectors, visible light detectors and laser detectors. The field of view of the detectors is independently adjustable, and the field of view range of the detectors is α: 0.2°-15°.

12. The off-axis multimode detection device according to claim 11, characterized in that: Infrared light detectors, visible light detectors, and laser detectors are commercially available infrared light cameras, visible light cameras, and laser cameras.

13. The off-axis multimode detection device according to claim 1, characterized in that: The diameter d1 of the first detector objective lens corresponds to the diameter D1 of the beam splitter. The diameter d2 of the second detector objective lens corresponds to the maximum values ​​of the diameters D2 of the reflecting mirror, D3 of the secondary mirror, and D4 of the primary mirror when α=15°. These values ​​are as follows: The center point of the reflecting mirror is L2 away from the objective lens, and the diameter of the mirror is D2: D2≈1.414*(d2+2*L2*tan(α / 2)). Beam splitter 2, the center point is at a distance L1 from the objective lens of the first detector, and at a distance L3 from the reflector. The lens diameter D1: D1≈1.414*(d1+2*L1*tan(α / 2)) or D1≈1.414*(D2+2*L3*tan(α / 2)), D1 is the larger of the two. The secondary mirror is L4 away from the second beam splitter, and the mirror diameter is D3: D3≈1.414*(D1+2*L4*tan(α / 2)). The primary mirror is L5, and the distance to the eccentric beam splitter is D4: D4≈1.414*(D3+2*L5*tan(α / 2)).

Images