An optical tracking device detection platform

Abstract

The present invention relates to the field of optical detection technology, and in particular provides an optical tracking device detection platform, which includes a support truss fixed on the top surface of the platform and a collimator fixed on the support truss. A detection point is provided on the top surface of the platform. There are five support trusses, and the five support trusses surround the periphery of the detection point. One collimator is fixed on each of four of the support trusses, and they are distributed in four directions of the target object in four different top-down and bottom-up angles. On another support truss, they are distributed in the multi-dimensional height of the target object in top-down and bottom-up angles. The light and photoelectric tracking device detection platform can complete the azimuth accuracy test of the detection point target object and improve the detection accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of optical detection, and particularly relates to an optical tracking device detection platform. Background Art

[0002] The optoelectronic tracking device is one of the main equipments of the measurement and control system. Its main function is to stably track various targets such as missiles and spacecrafts, and accurately give the angular position data of the above targets. Therefore, the angle measurement accuracy of the optoelectronic tracking device is one of the key technical indicators. In the existing detection platform, a group of optoelectronic trackers are used to implement signal detection on the ground object. This detection method has poor detection effect. When a group of optoelectronic trackers perform multi-angle detection, the detection time is long, the internal light source is continuously powered on for a long time, and the heat of the optical signal reflected onto the lens is large. When the temperature exceeds 20°C ± 5°C, it will cause the optical material of the lens to be unstable, affecting the accuracy of the optical signal feedback. Summary of the Invention

[0003] In order to solve the above problems, the present invention provides the following technical solutions to solve at least one of the above technical problems:

[0004] An optical tracking device detection platform includes a platform, a support truss fixed on the top surface of the platform, and a collimator fixed on the support truss. There are detection points on the top surface of the platform. There are five support trusses, and the five support trusses surround the periphery of the detection points. One collimator is fixed on each of four of the support trusses, and the four collimators are at four different azimuth angles relative to the detection points. Five collimators are fixed on the other support truss from top to bottom, and the five collimators face the detection points at different top view angles or elevation angles; the collimator includes a middle cylinder on the outside, a main mirror assembly arranged at the front end of the middle cylinder, a secondary mirror assembly arranged in the middle cylinder, a light source arranged in the middle cylinder, and an expansion tube arranged in the middle cylinder and located behind the secondary mirror assembly. An exhaust mechanism is arranged at the rear side of the middle cylinder. The exhaust mechanism includes an exhaust pipe fixed on the rear end of the middle cylinder, and a driving rod installed in the expansion tube. One end of the driving rod is connected to the front end of the expansion tube, and the other end of the driving rod is connected to the rear end of the exhaust pipe. An air port is arranged at the rear end of the middle cylinder, and the air port is in front-back communication with the exhaust pipe. The secondary mirror assembly includes a back plate fixed in the middle cylinder, a secondary mirror tube installed in the middle of the back plate, and a secondary mirror fixed in the secondary mirror tube. A clamping cavity is formed between the back plate and the rear end of the middle cylinder. The expansion tube and the light source are located in the clamping cavity. The light source is aligned with the secondary mirror tube, and the lumen of the secondary mirror tube is coaxial with the air port. The main mirror assembly includes a pointing laser installed on its front side.

[0005] As a further preference, there are two expansion tubes, upper and lower. A driving rod is installed in the two expansion tubes. A pressing piece is fixed on the outer side of the driving rod. The pressing piece is located at the outer end of the exhaust pipe and close to the outer end of the exhaust pipe.

[0006] As a further preference, a cone thorn seat is installed on the surface of the pressing piece facing the expansion tube. A through hole is provided in the cone thorn seat. A sealing port is provided on the surface of the expansion tube facing the cone thorn seat. When the cone thorn seat pierces into the sealing port, the sealing port is opened by using the conical surface, and at the same time, external air enters the exhaust pipe through the through hole.

[0007] As a further preference, a blower is fixed on the driving rod. The air inlet end of the blower is connected to the outer end of the cone thorn seat. When the cone thorn seat is inserted into the sealing port, the blower is turned on and air is injected into the exhaust pipe from the sealing port.

[0008] As a further preference, expansion threads are provided in the length direction of the expansion tube. A shape memory alloy is wound in the expansion tube along the expansion threads. The two expansion tubes have the same length. The lengths of the expansion threads on the two expansion tubes are the same. The winding lengths of the shape memory alloy on the two expansion tubes are the same.

[0009] As a further preference, two ducts, upper and lower, are fixed to the rear end of the middle cylinder. The upper and lower parts of the driving rod are slidably fitted in the two ducts. The ducts are metal tubes, and the outer end lengths of the ducts exceed the rear end of the middle cylinder.

[0010] As a further preference, air channels are provided on the back plate of the secondary mirror assembly. One end of the air channel communicates with the clamping cavity, and the other end communicates with the cavity where the primary mirror assembly is located. A number of the air channels are arranged in an annular array. The number of the air channels surrounds the periphery of the secondary mirror tube and is close to the secondary mirror tube.

[0011] As a further preference, the primary mirror assembly includes a three-leaf plate. An assembly hole is provided in the middle of the three-leaf plate. The primary mirror assembly further includes a primary mirror fixed in the assembly hole. The primary mirror and the secondary mirror are on the same axis. Three channels communicating with the inner cavity of the middle cylinder are formed on the three-leaf plate. The pointing laser is installed on the front side of the primary mirror.

[0012] The beneficial effects of the present invention compared with the prior art are:

[0013] 1. The light sources in each collimator emit light rays. After being magnified by the secondary mirror, the light rays are irradiated onto the primary mirror and then emitted from the primary mirror to the target. Since the four support trusses are arranged at the four orientations of the target, and the collimators on the four support trusses are distributed at the four orientations of the target in four different top-down and bottom-up angles, and on another support truss, they are distributed at the multi-dimensional heights of the target in top-down and bottom-up angles, the light and electro-optical tracking equipment detection platform can complete the azimuth accuracy test of the detection point target, improving the detection accuracy.

[0014] 2. The collimator also has an automatic heat dissipation function. The heat generated by the light source is fed back to the cavity between the backplane and the rear end of the middle cylinder. When the temperature in the cavity reaches 20°C ± 5°C, it will affect the optical surfaces of the primary mirror and the secondary mirror. At this time, the shape memory alloy heats up and elongates, and the heat is discharged from the cavity to the exhaust pipe through the air port. At the same time, the expansion tube heats up and elongates. The elongation of the expansion tube plus the thrust generated when the shape memory alloy heats up and elongates drives the drive rod to drag forward. The drive rod drags the pressing piece forward, and the pressing piece drags the cone seat forward. The conical tip of the cone seat pierces into the sealing port and drags the exhaust pipe forward. As the exhaust pipe is compressed, and as the tip of the cone seat pierces into the sealing port, the heat in the exhaust pipe is released outward through the through holes. As the exhaust pipe is compressed forward, the heat in the cavity is quickly discharged outward until the temperature in the cavity decreases. The secondary mirror is always protected at a low temperature, and the optical surface of the secondary mirror will not deform, ensuring that the detection accuracy is not affected by temperature.

[0015] 3. When the exhaust pipe is compressed forward, in addition to releasing some hot air through the through holes on the cone seat, it will also release some heat in the cavity forward through the air channels. This part of the hot air continues to be released forward through the channels on the three-leaf plate and outside the collimator. The primary mirror and the pointing laser are installed on the front side of the collimator. When this part of the heat reaches the primary mirror and the pointing laser in the way of squeezing and exhausting, it will be released forward through the channels. Therefore, it will not affect the primary mirror and the pointing laser. The heat in the cavity is released through the front and back two channels, improving the exhaust efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of a detection platform for an optical tracking device provided by an embodiment of the present invention from the first perspective;

[0017] Figure 2 It is a schematic diagram of a detection platform for an optical tracking device provided by an embodiment of the present invention from the second perspective;

[0018] Figure 3 It is a schematic diagram of only one set of collimators in a detection platform for an optical tracking device provided by an embodiment of the present invention;

[0019] Figure 4This is a schematic diagram of the structure after being cut open from another perspective for the embodiment of the present invention; Figure 3 and is a schematic diagram of the structure after being cut open from another perspective for the embodiment of the present invention;

[0020] Figure 5 This is a schematic diagram of the structure after being cut open from another perspective for the embodiment of the present invention; Figure 4 and is an enlarged schematic diagram of part A led out for the embodiment of the present invention;

[0021] Figure 6 This is a schematic diagram of another perspective after being cut open for the embodiment of the present invention; Figure 4 and is a schematic diagram of another perspective after being cut open for the embodiment of the present invention;

[0022] Figure 7 This is a schematic diagram of the planar structure after being cut open for the embodiment of the present invention;

[0023] Figure 8 This is a schematic diagram of the structure after being cut open from another perspective for the embodiment of the present invention; Figure 7 and is an enlarged schematic diagram of part B led out for the embodiment of the present invention;

[0024] Figure 9 This is a planar schematic diagram of one end of the expansion tube with a sealed opening in the embodiment of the present invention.

[0025] In the figure: 1, platform; 2, support truss; 3, collimator; 4, detection point; 5, middle cylinder; 6, primary mirror assembly; 7, secondary mirror assembly; 8, light source; 9, expansion tube; 10, exhaust mechanism; 11, exhaust pipe; 12, drive rod; 13, air port; 14, back plate; 15, secondary mirror tube; 16, secondary mirror; 17, clamping cavity; 18, pressing plate; 19, conical spike seat; 20, through hole; 21, sealed opening; 22, shape memory alloy; 23, conduit; 24, air channel; 25, three - leaf plate; 26, assembly hole; 27, primary mirror; 28, channel; 29, fan; 30, pointing laser. Specific embodiments

[0026] The following will clearly and completely describe the above - mentioned and other embodiments and advantages of the present invention with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all embodiments.

[0027] In one embodiment, as Figures 1-9 shown: This embodiment provides an optical tracking device detection platform, including a platform 1, a support truss 2 fixed on the top surface of the platform 1, and a collimator 3 fixed on the support truss 2. A detection point 4 is arranged on the top surface of the platform 1. There are five support trusses 2, and the five support trusses 2 surround the periphery of the detection point 4. One collimator 3 is fixed on each of the four support trusses 2, and the four collimators 3 are at four different azimuth angles relative to the detection point 4. On the other support truss 2, five collimators 3 are fixed from top to bottom, and the five collimators 3 face the detection point 4 at different top - view or bottom - view angles;

[0028] As Figure 4 , Figure 6 shown, the collimator 3 includes an outer middle tube 5, a primary mirror assembly 6 disposed at the front end of the middle tube 5, a secondary mirror assembly 7 disposed within the middle tube 5, a light source 8 disposed within the middle tube 5, and further includes an expansion tube 9 disposed within the middle tube 5 and behind the secondary mirror assembly 7. An exhaust mechanism 10 is provided at the rear side of the middle tube 5. The exhaust mechanism 10 includes an exhaust pipe 11 fixed to the rear end of the middle tube 5, and further includes a driving rod 12 installed within the expansion tube 9. One end of the driving rod 12 is connected to the front end of the expansion tube 9, and the other end of the driving rod 12 is connected to the rear end of the exhaust pipe 11. An air port 13 is provided at the rear end of the middle tube 5, and the air port 13 communicates with the exhaust pipe 11 in the front and rear directions. The secondary mirror assembly 7 includes a back plate 14 fixed within the middle tube 5, a secondary mirror tube 15 installed in the middle of the back plate 14, and a secondary mirror 16 fixed within the secondary mirror tube 15. A clamping cavity 17 is formed between the back plate 14 and the rear end of the middle tube 5. The expansion tube 9 and the light source 8 are located within the clamping cavity 17. The light source 8 is aligned with the secondary mirror tube 15. The lumen of the secondary mirror tube 15 is coaxial with the air port 13. The primary mirror assembly 6 includes a pointing laser 30 installed on its front side.

[0029] There are two upper and lower expansion tubes 9. A driving rod 12 is commonly installed within the two expansion tubes 9. A pressing piece 18 is fixed to the outer side of the driving rod 12. The pressing piece 18 is located at the outer end of the exhaust pipe 11 and is close to the outer end of the exhaust pipe 11.

[0030] A conical spike seat 19 is installed on the surface of the pressing piece 18 facing the expansion tube 9. A through hole 20 is provided in the conical spike seat 19. A sealing port 21 is provided on the surface of the expansion tube 9 facing the conical spike seat 19. When the conical spike seat 19 pierces into the sealing port 21, the sealing port 21 is opened by using the conical surface, and at the same time, external air enters the exhaust pipe 11 through the through hole 20.

[0031] Expansion threads are provided in the length direction of the expansion tube 9. A shape memory alloy 22 is wound within the expansion tube 9 along the expansion threads. The lengths of the two expansion tubes 9 are the same, the lengths of the expansion threads on the two expansion tubes 9 are the same, and the winding lengths of the shape memory alloy 22 on the two expansion tubes 9 are the same.

[0032] Two upper and lower guide tubes 23 are fixed to the rear end of the middle tube 5. The upper and lower parts of the driving rod 12 are slidably fitted within the two guide tubes 23. The guide tubes 23 are metal tubes, and the outer end lengths of the guide tubes 23 exceed the rear end of the middle tube 5.

[0033] An air passage 24 is provided on the back plate 14 of the secondary mirror assembly 7. One end of the air passage 24 communicates with the clamping cavity 17, and the other end communicates with the cavity where the primary mirror assembly 6 is located. A number of air passages 24 are provided in an annular array. The number of air passages 24 surrounds the periphery of the secondary mirror tube 15 and is close to the secondary mirror tube 15.

[0034] The main mirror assembly 6 includes a three - leaf plate 25. An assembly hole 26 is formed in the middle of the three - leaf plate 25. The main mirror assembly 6 further includes a main mirror 27 fixed in the assembly hole 26. The main mirror 27 and the secondary mirror 16 are on the same axis. Three channels 28 communicating with the inner cavity of the middle cylinder 5 are formed on the three - leaf plate 25. The main mirror assembly 6 further includes a pointing laser 30 installed on its front side.

[0035] Working principle and effect: The target is located at the detection point 4. The light sources in each collimator 3 emit light rays. The light rays are magnified by the secondary mirror 16 and then irradiated onto the main mirror 27, and then emitted from the main mirror 27 to the target. As Figure 1 shown, since the four support trusses 2 are arranged at the four azimuths of the target, and the collimators 3 on the four support trusses 2 are distributed at the four azimuths of the target in four different top - down and bottom - up angles, and since on another support truss 2, they are distributed at the multi - dimensional heights of the target in top - down and bottom - up angles, the light ray photoelectric tracking device detection platform can complete the azimuth accuracy test of the target (photoelectric tracking device signal) at the detection point 4, improving the detection accuracy.

[0036] In addition, the collimator 3 also has an automatic heat dissipation function, which can ensure that the optical surfaces of the main mirror 27 and the secondary mirror 16 will not be deformed, ensuring that the laser beam emitted by the laser coincides and is co - axial with the light rays of the two mirrors. At the same time, it ensures that the optical signal is co - axial with the pointing laser 30, improving the optical signal test quality of the target at the detection point 4.

[0037] The temperature change in the collimator 3 is mainly generated by the light source 8. The heat generated by the light source 8 is fed back into the cavity 17 between the backplane 14 and the rear end of the middle cylinder 5. When the temperature in the cavity 17 reaches 20°C ± 5°C, it will affect the optical surfaces of the primary mirror 27 and the secondary mirror 16. At this time, the shape memory alloy 22 heats up and elongates, and the heat is discharged from the cavity 17 through the air port 13 into the exhaust pipe 11. At the same time, the expansion tube 9 heats up and elongates. The elongation of the expansion tube 9 plus the thrust generated when the shape memory alloy 22 heats up and elongates drives the drive rod 12 to move forward (towards the backplane 14), the drive rod 12 drags the pressing piece 18 forward, the pressing piece 18 drags the cone seat 19 forward, and the conical tip of the cone seat 19 pierces into the sealing port 21 and drags the exhaust pipe 11 forward. As the exhaust pipe 11 is compressed forward, as the tip of the cone seat 19 pierces into the sealing port 21, the heat in the exhaust pipe 11 is released outward through the through hole 20. As the exhaust pipe 11 is compressed forward, the heat in the cavity 17 is quickly discharged outward until the temperature in the cavity 17 decreases. As the temperature in the cavity 17 decreases, the shape memory alloy 22 cools and returns to its original shorter length. As the shape of the shape memory alloy 22 returns and its length shortens, the length of the expansion tube 9 also compresses and shortens. At this time, the drive rod 12 moves backward, the drive rod 12 drives the pressing piece 18 to move backward, and the pressing piece 18 drives the cone seat 19 to move backward, so that the cone seat 19 leaves the sealing port 21, the sealing port 21 closes, the exhaust pipe 11 resumes sealing, and at the same time returns to its original length. When the temperature in the cavity 17 reaches 20°C ± 5°C again, through the above actions, the exhaust pipe 11 exhausts again, the cavity 17 cools down again, and the secondary mirror 16 is always in a low-temperature state. The secondary mirror 16 is always protected by low temperature, and the optical surface of the secondary mirror 16 will not deform. When the exhaust pipe 11 is compressed forward, in addition to releasing some hot air outward through the through hole 20 on the cone seat 19, it will also release some heat in the cavity 17 forward through the air passage 24. This part of the hot air continues to be released forward through the passage 28 on the three-leaf plate 25 to the outside of the collimator 3. The primary mirror 27 and the pointing laser 30 are installed on the front side of the collimator 3. When this part of the heat reaches the primary mirror 27 and the pointing laser 30 in the way of squeezing and exhausting, it will be released forward through the passage 28. Therefore, the high temperature will not affect the primary mirror 27 and the pointing laser 30. The heat in the cavity 17 is released through two channels, which improves the exhaust efficiency.

[0038] In another embodiment, as Figure 6As shown in the figure, a blower 29 is fixed on the drive rod 12. The air inlet end of the blower 29 is connected to the outer end of the cone puncture seat 19. When the cone puncture seat 19 is inserted into the sealing port 21, the blower 29 is turned on, and air is injected into the exhaust pipe 11 through the sealing port 21. A temperature sensor is arranged in the clamping cavity 17, and a controller is installed on the blower 29. When the temperature in the clamping cavity 17 reaches 20°C ± 5°C, the temperature sensor feeds back a signal to the controller, and the controller controls the rotation of the blower 29. At this time, the expansion tube 9 and the shape memory alloy 22 become longer, and drag the drive rod 12 to drive the pressing piece 18 to move forward. The pressing piece 18 pierces the cone puncture seat 19 through the sealing port 21 and stabs it on the exhaust pipe 11, and pushes the exhaust pipe 11 forward to compress and shorten. In addition to releasing the heat in the clamping cavity 17 forward through the air passage 24, the blower 29 also blows air into the exhaust pipe 11 through the air outlet pipe. As the exhaust pipe 11 is compressed forward, it helps the hot air in the clamping cavity 17 to be quickly released forward. After the temperature of the clamping cavity 17 decreases, in addition to the expansion tube 9 and the shape memory alloy 22 becoming shorter and restoring, and the expansion tube 9 pushing the drive rod 12 backward to reset, so that the cone puncture seat 19 leaves the exhaust pipe 11, the blower 29 also moves away from the exhaust pipe 11, the air outlet pipe on the blower 29 also leaves the exhaust pipe 11, the blower 29 stops rotating, and the air blowing stops.

[0039] The above orientation references do not represent the specific orientations of the components in this implementation scheme. This implementation scheme is only for the convenience of describing the scheme, and the relative descriptions are set with reference to the orientations in the figure. In essence, the specific orientations of the components are based on their actual installation, actual use, and the habitual orientation descriptions of those skilled in the art. This is hereby explained.

[0040] The above specific implementation manners have further elaborated on the invention purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above is only the specific implementation manner of the present invention and is not used to limit the protection scope of the present invention. It is particularly pointed out that for those skilled in the art, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An optical tracking device detection platform, characterized in that Comprising a platform (1), a support truss (2) fixed on the top surface of the platform (1), and a collimator (3) fixed on the support truss (2). A detection point (4) is provided on the top surface of the platform (1). There are five support trusses (2), and the five support trusses (2) surround the periphery of the detection point (4). One collimator (3) is fixed on each of four of the support trusses (2), and the four collimators (3) are at four different azimuth angles relative to the detection point (4). On the other support truss (2), five collimators (3) are fixed from top to bottom, and the five collimators (3) face the detection point (4) at different top view angles or bottom view angles; the collimator (3) includes an outer middle tube (5), a primary mirror assembly (6) provided at the front end of the middle tube (5), a secondary mirror assembly (7) provided in the middle tube (5), a light source (8) provided in the middle tube (5), and further includes an expansion tube (9) provided in the middle tube (5) and located behind the secondary mirror assembly (7). An exhaust mechanism (10) is provided at the rear side of the middle tube (5), and the exhaust mechanism (10) includes an exhaust pipe (11) fixed to the rear end of the middle tube (5); also includes a driving rod (12) installed in the expansion tube (9). One end of the driving rod (12) is connected to the front end of the expansion tube (9), and the other end of the driving rod (12) is connected to the rear end of the exhaust pipe (11). An air port (13) is provided at the rear end of the middle tube (5), and the air port (13) communicates with the exhaust pipe (11) front and rear. The secondary mirror assembly (7) includes a back plate (14) fixed in the middle tube (5), a secondary mirror tube (15) installed in the middle of the back plate (14), and a secondary mirror (16) fixed in the secondary mirror tube (15). A clamping cavity (17) is formed between the back plate (14) and the rear end of the middle tube (5). The expansion tube (9) and the light source (8) are located in the clamping cavity (17). The light source (8) is aligned with the secondary mirror tube (15). The lumen of the secondary mirror tube (15) is coaxial with the air port (13). The primary mirror assembly (6) includes a pointing laser (30) installed on its front side. There are two upper and lower expansion tubes (9), and a driving rod (12) is commonly installed in the two expansion tubes (9). A pressing piece (18) is fixed on the outer side of the driving rod (12), and the pressing piece (18) is located at the outer end of the exhaust pipe (11) and close to the outer end of the exhaust pipe (11); a conical spike seat (19) is installed on the surface of the pressing piece (18) facing the expansion tube (9). A through hole (20) is provided in the conical spike seat (19). A sealing port (21) is provided on the surface of the expansion tube (9) facing the conical spike seat (19). When the conical spike seat (19) pierces into the sealing port (21), the sealing port (21) is opened by using the conical surface, and at the same time, external air enters the exhaust pipe (11) through the through hole (20); An expansion thread is provided in the length direction of the expansion tube (9), and a memory alloy (22) is wound inside the expansion tube (9) along the expansion thread. The two expansion tubes (9) have the same length, the expansion threads on the two expansion tubes (9) have the same length, and the winding length of the memory alloy (22) on the two expansion tubes (9) is the same.

2. The optical tracking device detection platform according to claim 1, characterized in that A fan (29) is fixed to the driving rod (12), and an air inlet end of the fan (29) is connected to an outer end of the conical seat (19). When the conical seat (19) is inserted into the sealing opening (21), the fan (29) is turned on and air is injected into the exhaust pipe (11) through the sealing opening (21).

3. The optical tracking device detection platform according to claim 2, characterized in that, Two upper and lower guide tubes (23) are fixed to the rear end of the middle tube (5), and the upper and lower parts of the driving rod (12) are slidably fitted in the two guide tubes (23). The guide tubes (23) are metal tubes, and the outer ends of the guide tubes (23) are longer than the rear end of the middle tube (5).

4. The optical tracking device detection platform according to claim 3, characterized in that, An air channel (24) is provided on the back plate (14) of the secondary mirror assembly (7), one end of the air channel (24) is in communication with the clamping cavity (17), and the other end is in communication with the cavity where the primary mirror assembly (6) is located, and a plurality of the air channels (24) are provided in a circular array, and the plurality of the air channels (24) surround the periphery of the secondary mirror tube (15) and are close to the secondary mirror tube (15).

5. The optical tracking device detection platform according to claim 4, characterized in that The primary mirror assembly (6) comprises a three-leaf plate (25), an assembly hole (26) is formed in the middle of the three-leaf plate (25), the primary mirror assembly (6) further comprises a primary mirror (27) fixed in the assembly hole (26), the primary mirror (27) and the secondary mirror (16) are on the same axis, three channels (28) are formed on the three-leaf plate (25) and communicate with the inner cavity of the middle tube (5), and the pointing laser (30) is mounted on the front side of the primary mirror (27).

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