A medium-wave infrared lens transmittance detection device

Abstract

The present invention belongs to the field of infrared lens testing technology, and discloses a medium-wave infrared lens transmittance detection device, including a workbench and a protective cover, wherein aperture 1 and aperture 2 are respectively installed on both sides of the protective cover, a placement slot is provided on the top of the workbench, a light source and a detector are respectively installed on the top of the workbench on the left and right sides of the protective cover, a support plate and a guide column are installed at the bottom of the workbench, and a telescopic rod is installed on the top of the support plate. The device can realize the test of the transmittance of a reflective optical lens. In addition, the other half of the light is reflected to the lens to be tested through reflector 1 and reflector 3, and the transmitted light is horizontally injected into the detector through the middle part thereof through a relay mirror, reflector 6 and reflector 4, thereby realizing the test of the transmittance of a transmission optical lens. The internal reflection method adopted by the input reflection mechanism and the output reflection mechanism greatly improves the utilization rate of the device and reduces the cost.

Description

Technical Field

[0001] The invention belongs to the technical field of infrared lens testing, and in particular relates to a medium-wave infrared lens transmittance detection device. Background Art

[0002] In the field of optical lenses, medium-wave infrared lenses are often used. This type of lens has strong environmental adaptability and high transmittance. Therefore, it is often used in high-precision fields such as monitoring and thermal imaging. In high-precision measurement, the amount of light passing through an optical lens is generally expressed by transmittance, that is, the amount of light that can pass through the optical lens. In the prior art, there are still some defects in the transmittance detection of medium-wave infrared lenses: it is impossible to simultaneously be compatible with projection and reflection detection, resulting in the need to add additional detection equipment for lens detection, increasing the detection cost, and the detection variables are generally not set, resulting in environmental factors that affect the lens transmittance (such as temperature) not appearing, which in turn affects the final detection accuracy. Based on the above defects and deficiencies, this case designs and provides a medium-wave infrared lens transmittance detection device. Summary of the invention

[0003] The object of the present invention is to provide a medium-wave infrared lens transmittance detection device to solve the problems raised in the above background technology.

[0004] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a medium-wave infrared lens transmittance detection device, comprising a workbench and a protective cover, wherein aperture 1 and aperture 2 are respectively installed on both sides of the protective cover, a placement slot is provided on the top of the workbench, a light source and a detector located on the left and right sides of the protective cover are respectively installed on the top of the workbench, a support plate and a guide column are installed on the bottom of the workbench, a telescopic rod is installed on the top of the support plate, a liquid storage block is installed on the telescopic end of the telescopic rod, a connecting column is fixedly connected to the top of the liquid storage block, a placing ring is fixedly installed on the top of the connecting column, a lens to be tested is installed inside the placing ring, and an input reflection mechanism and an output reflection mechanism are also respectively installed inside the protective cover;

[0005] The input reflection mechanism comprises a placing frame 1, a passing frame 1 is installed on the left side of the placing frame 1, a passing frame 2 and a passing frame 3 are installed at the front and rear ends of the right side respectively, a reflecting mirror 1 is installed at the middle of the inner wall of the placing frame 1, and a reflecting mirror 2 and a reflecting mirror 3 are installed at the front and rear sides of the inner wall of the placing frame 1 respectively;

[0006] The output reflection mechanism includes a placement frame 2, a through frame 5 and a through frame 6 are respectively installed on the front and rear ends of the left side of the placement frame 2, a through frame 4 is installed on the right side, a reflector 4 is installed in the middle of the inner wall of the placement frame 2, a reflector 5 and a reflector 6 are respectively installed on the front and rear sides of the inner wall of the placement frame 2, and a relay mirror is installed inside the through frame 6.

[0007] As a preferred solution of the present invention, the left and right ends of the liquid storage block are respectively sleeved and fitted with the guide columns, and the liquid storage block is adapted to be placed in a placement groove, which is opened at a front middle position on the top of the workbench.

[0008] As a preferred solution of the present invention, a partition is fixedly installed in the middle of the inner cavity of the liquid storage block, and is sealed and divided into a water storage cavity and a recovery cavity by the partition. A balancing hole is provided on one side of the recovery cavity, and an air intake channel and an exhaust channel are respectively provided inside the connecting column. A heating cavity is provided inside the placement ring, and is connected to the inner cavity of the liquid storage block through the connecting column.

[0009] As a preferred solution of the present invention, the heating chamber is connected with the water storage chamber through an air inlet channel, and the heating chamber is also connected with the recovery chamber through an exhaust channel. A cooling mechanism is installed through the inner wall of the exhaust channel, and a condenser is fixedly installed on the outer surface of the cooling mechanism, and the condenser passes through the exhaust channel.

[0010] As a preferred solution of the present invention, two groups of clamping rings are fixedly installed on the inner ring surface of the placement ring, and the tested lens is limited and clamped between the two groups of clamping rings through the clamping rings, so that the tested lens can be removed or installed from the inner ring of the placement ring.

[0011] As a preferred solution of the present invention, the input reflection mechanism, the output reflection mechanism and the measured lens respectively divide the light from the light source into reflected light a and transmitted light b.

[0012] As a preferred solution of the present invention, the light path of the reflected light a is as follows: light source, aperture 1, reflector 1, reflector 2, through frame 2, through frame 5, reflector 5, reflector 4, through frame 4, aperture 2, detector;

[0013] The light path of the transmitted light b is as follows: light source, aperture 1, reflector 1, reflector 3, through frame 3, measured lens, through frame 6, relay mirror, reflector 6, reflector 4, through frame 4, aperture 2, and detector.

[0014] As a preferred embodiment of the present invention, the inner cavity of the water storage chamber is filled with water and is installed with a thermocouple, which is used to heat the water and generate water vapor. The water vapor movement path is: water storage chamber, air inlet channel, heating chamber, exhaust channel, and recovery chamber.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. This device has been redesigned and optimized so that it has the function of testing the transmittance of optical lenses of both transmission and reflection types. By providing an input reflection mechanism and an output reflection mechanism that are symmetrical and internally symmetrical, the light from the light source is divided into two. Half of the light is reflected to the passing frame two through reflectors one and two, and directly reflected to the detector through reflectors five and four, so as to realize the test of the transmittance of the reflective optical lens. In addition, the other half of the light is reflected to the lens to be tested through reflectors one and three, and the transmitted light is horizontally shot into the detector through the middle part through a relay mirror, a reflector six and a reflector four, so as to realize the test of the transmittance of the transmission optical lens. The internal reflection method adopted by the input reflection mechanism and the output reflection mechanism greatly improves the utilization rate of the device and reduces the cost.

[0017] 2. The device also has a heating chamber inside a placement ring for supporting and fixing the lens to be tested, and is connected to the inner cavity of the liquid storage block through a connecting column. After completing the test in a natural environment, the water in the water storage chamber can be heated to generate water vapor, and then the water vapor enters the heating chamber through the air inlet channel to heat the placement ring, so that the placement ring can evenly heat the peripheral surface of the lens to be tested by heat conduction, so that the lens to be tested can be tested at different temperatures to obtain different transmittance data, thereby improving the versatility of the device.

[0018] 3. Finally, the device also adds a lifting system to the placement ring and the lens under test. The lifting system consists of a support plate, a guide column and a telescopic rod. The telescopic rod drives the liquid storage block, the connecting column and the placement ring to move up and down. The guide column and the side of the liquid storage block are used for guiding and adapting to maintain the stability of the placement ring during movement. By controlling the height of the placement ring, the axis of the lens under test is made collinear with the optical axis for easy adjustment, thereby improving the detection accuracy of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The front appearance of the structure of the present invention is shown in FIG. Figure 1 ;

[0020] Figure 2 The front appearance of the structure of the present invention is shown in FIG. Figure 2 ;

[0021] Figure 3 It is a schematic diagram of the top view of the structure of the present invention;

[0022] Figure 4 It is a partial top view cutaway schematic diagram of the structure of the present invention;

[0023] Figure 5 For the present invention Figure 4 A magnified schematic diagram of the structure at center A;

[0024] Figure 6 It is a front cutaway schematic diagram of the structure of the present invention;

[0025] Figure 7 For the present invention Figure 5 A magnified schematic diagram of the structure at B in the middle;

[0026] Figure 8 The present invention is a schematic structural diagram of a guide column, a telescopic rod, a liquid storage block, a connecting column, a cooling mechanism, a placement ring, a clamping ring and a lens to be tested.

[0027] In the figure: 1, workbench; 2, protective cover; 21, aperture 1; 22, aperture 2; 3, light source; 4, detector; 5, input reflection mechanism; 51, placement frame 1; 52, through frame 1; 53, through frame 2; 54, through frame 3; 55, reflector 1; 56, reflector 2; 57, reflector 3; 6, output reflection mechanism; 61, placement frame 2; 62, through frame 4; 63, through frame 5; 64, through frame 6; 65, reflector 4 ; 66. Reflector five; 67. Reflector six; 68. Relay mirror; 7. Placement slot; 8. Support plate; 9. Guide column; 10. Telescopic rod; 11. Liquid storage block; 111. Partition; 112. Water storage chamber; 113. Recovery chamber; 12. Connecting column; 13. Cooling mechanism; 131. Condenser; 14. Placement ring; 15. Balance hole; 16. Clamping ring; 17. Lens under test; 18. Heating chamber; 19. Air inlet channel; 20. Exhaust channel. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] like Figures 1 to 8 As shown, the embodiment of the present invention provides a medium-wave infrared lens transmittance detection device, including a workbench 1, a protective cover 2, an aperture 1 21 and an aperture 2 22 are respectively installed on both sides of the protective cover 2, a placement slot 7 is provided on the top of the workbench 1, a light source 3 and a detector 4 are respectively installed on the top of the workbench 1 on the left and right sides of the protective cover 2, a support plate 8 and a guide column 9 are installed on the bottom of the workbench 1, a telescopic rod 10 is installed on the top of the support plate 8, a liquid storage block 11 is installed at the telescopic end of the telescopic rod 10, a connecting column 12 is fixedly connected to the top of the liquid storage block 11, a placing ring 14 is fixedly installed on the top of the connecting column 12, a lens 17 to be tested is installed inside the placing ring 14, and an input reflection mechanism 5 and an output reflection mechanism 6 are also respectively installed inside the protective cover 2;

[0030] The input reflection mechanism 5 comprises a placing frame 1 51, a passing frame 1 52 is installed on the left side of the placing frame 1 51, a passing frame 2 53 and a passing frame 3 54 are installed at the front and rear ends of the right side respectively, a reflecting mirror 1 55 is installed at the middle of the inner wall of the placing frame 1 51, and a reflecting mirror 2 56 and a reflecting mirror 3 57 are installed at the front and rear sides of the inner wall of the placing frame 1 51 respectively;

[0031] The output reflection mechanism 6 includes a second placement frame 61, a fifth through frame 63 and a sixth through frame 64 are respectively installed at the front and rear ends of the left side of the second placement frame 61, a fourth through frame 62 is installed on the right side, a fourth reflector 65 is installed at the middle of the inner wall of the second placement frame 61, a fifth reflector 66 and a sixth reflector 67 are respectively installed at the front and rear sides of the inner wall of the second placement frame 61, and a relay mirror 68 is installed inside the sixth through frame 64;

[0032] The device has been redesigned and optimized so that it has the function of testing the transmittance of optical lenses of both transmission and reflection types. By providing an input reflection mechanism 5 and an output reflection mechanism 6 which are symmetrical and internally symmetrical, the light from the light source 3 is divided into two. Half of the light is reflected through the reflector 1 55 and the reflector 2 56 to pass through the frame 2 53, and is directly reflected through the reflector 5 66 and the reflector 4 65 to the detector 4, thereby realizing the test of the transmittance of the reflective optical lens. In addition, the other half of the light is reflected through the reflector 1 55 and the reflector 3 57 to the lens 17 to be tested, and through the middle thereof, the transmitted light is horizontally shot into the detector 4 through the relay mirror 68, the reflector 6 67 and the reflector 4 65, thereby realizing the test of the transmittance of the transmission optical lens. The internal reflection method adopted by the input reflection mechanism 5 and the output reflection mechanism 6 greatly improves the utilization rate of the device and reduces the cost.

[0033] The device also has a heating chamber 18 opened inside the placement ring 14 for supporting and fixing the lens 17 to be tested, and is connected to the inner cavity of the liquid storage block 11 through the connecting column 12. After completing the test in the natural environment, the water in the water storage chamber 112 can be heated to generate water vapor, and then the water vapor enters the heating chamber 18 through the air inlet channel 19 to heat the placement ring 14, so that the placement ring 14 can evenly heat the outer peripheral surface of the lens 17 to be tested by heat conduction, so that the lens 17 to be tested can be tested at different temperatures to obtain different transmittance data, thereby improving the versatility of the device.

[0034] Finally, the device also adds a lifting system to the placement ring 14 and the lens 17 to be tested. The lifting system consists of a support plate 8, a guide column 9 and a telescopic rod 10. The telescopic rod 10 drives the liquid storage block 11, the connecting column 12 and the placement ring 14 to move up and down. The guide column 9 and the side of the liquid storage block 11 are used for guiding and adapting to maintain the stability of the placement ring 14 during movement. By controlling the height of the placement ring 14, the axis of the lens 17 to be tested is made collinear with the optical axis, which is easy to adjust, thereby improving the detection accuracy of the device.

[0035] The left and right ends of the liquid storage block 11 are respectively sleeved and adapted with the guide column 9, and the liquid storage block 11 is adapted to be placed in the placement groove 7, and the placement groove 7 is opened at the front middle position of the top of the workbench 1;

[0036] The support plate 8 is fixedly installed at the bottom of the workbench 1, corresponding to the placement groove 7, providing support for the guide column 9 and the telescopic rod 10. Guide plates are provided on both sides of the liquid storage block 11 and are guided and connected to the guide column 9 to provide guidance for the movement of the liquid storage block 11.

[0037] A partition 111 is fixedly installed in the middle of the inner cavity of the liquid storage block 11, and is sealed and divided into a water storage cavity 112 and a recovery cavity 113 by the partition 111. A balancing hole 15 is provided on one side of the recovery cavity 113. An air intake channel 19 and an air exhaust channel 20 are provided inside the connecting column 12. A heating cavity 18 is provided inside the placement ring 14, and is connected to the inner cavity of the liquid storage block 11 through the connecting column 12.

[0038] A thermocouple is installed inside the water storage chamber 112, so that the water in the water storage chamber 112 can be heated to generate water vapor. The water vapor can enter the heating chamber 18 upward through the air inlet channel 19 and heat the placement ring 14, thereby utilizing the heat conduction effect generated by the contact between the placement ring 14 and the lens 17 to uniformly heat the outer peripheral surface of the lens 17.

[0039] The heating chamber 18 is connected to the water storage chamber 112 through the air inlet channel 19, and the heating chamber 18 is also connected to the recovery chamber 113 through the exhaust channel 20. The inner wall of the exhaust channel 20 is penetrated by a cooling mechanism 13, and the outer surface of the cooling mechanism 13 is fixedly installed with a condenser 131, and the condenser 131 penetrates through the exhaust channel 20.

[0040] After the water vapor generated by heating the water storage chamber 112 enters the heating chamber 18 through the air inlet channel 19, positive pressure begins to be generated and flows downward along the exhaust channel 20 into the recovery chamber 113. The balance hole 15 is responsible for balancing the air pressure and venting the liquid storage block 11. When the water vapor passes through the exhaust channel 20, the cooling mechanism 13 can condense the water vapor into water by circulating cold water inside the condenser 131, and store it in the recovery chamber 113.

[0041] Among them, two groups of clamping rings 16 are fixedly installed on the inner ring surface of the placement ring 14, and the lens 17 to be tested is limited and clamped between the two groups of clamping rings 16 through the clamping rings 16, so that the lens 17 to be tested can be removed or installed from the inner ring of the placement ring 14;

[0042] The clamping ring 16 is made of rubber, and deforms by squeezing the lens 17 to generate a pressing force and a friction force with the lens 17 to fix the lens 17 and quickly remove the lens 17 when disassembling.

[0043] The input reflection mechanism 5, the output reflection mechanism 6 and the measured lens 17 respectively divide the light from the light source 3 into reflected light a and transmitted light b;

[0044] The input reflection mechanism 5 and the output reflection mechanism 6 form two sets of light reflection paths through internal reflection, and a single light source is repeatedly distributed and utilized, which greatly reduces the detection cost.

[0045] The light path of the reflected light a is as follows: light source 3, aperture 1 21, reflector 1 55, reflector 2 56, through frame 2 53, through frame 5 63, reflector 5 66, reflector 4 65, through frame 4 62, aperture 2 22, detector 4;

[0046] The light path of the transmitted light ray b is as follows: light source 3, aperture one 21, reflector one 55, reflector three 57, through frame three 54, measured lens 17, through frame six 64, relay mirror 68, reflector six 67, reflector four 65, through frame four 62, aperture two 22, detector 4;

[0047] The reflected light a does not pass through the lens 17 under test, and is completely reflected into the detector 4 . The transmitted light b needs to pass through the lens 17 under test and be transmitted, so that it is captured by the detector 4 to test the transmittance of the lens 17 under test.

[0048] The inner cavity of the water storage chamber 112 is filled with water and is equipped with a thermocouple, which is used to heat the water and generate water vapor. The water vapor moves along the following path: the water storage chamber 112, the air inlet channel 19, the heating chamber 18, the exhaust channel 20, and the recovery chamber 113.

[0049] Water vapor is generated by heating water in the water storage chamber 112 through a thermocouple, and is condensed by the cooling mechanism 13 to form liquid water, which can be recovered to the recovery chamber 113 for repeated use.

[0050] Working principle:

[0051] When the device is working, Figure 3 , 4As shown, the lens 17 to be tested can be installed inside the placement ring 14, and the light source 3 is turned on, so that the light emitted by the light source 3 enters the input reflection mechanism 5. At this time, the light is divided into two by the reflector 1 55, and the light reflected downward is b, which is reflected by the reflector 3 57 and horizontally enters the lens 17 to be tested, and passes through the through frame 6 64 to the right, and is converted into parallel light again by the relay mirror 68, and then passes through the through frame 4 62 again horizontally through the reflection of the reflector 6 67 and the reflector 4 65, and finally passes through the aperture 22 to be captured by the detector 4; at the same time, the light reflected upward is a, which is horizontally reflected by the reflector 2 56 and passes through the through frame 5 63, the reflector 5 66 and the reflector 4 65 to pass through the through frame 4 62, and finally passes through the aperture 22 to be captured by the detector 4, and the transmittance test of the transmission type and the reflection type optical lens is realized through the light intensity of a and b;

[0052] The light path of the reflected light ray a is as follows: light source 3, aperture 1 21, reflector 1 55, reflector 2 56, through frame 2 53, through frame 5 63, reflector 5 66, reflector 4 65, through frame 4 62, aperture 2 22, detector 4;

[0053] The light path of the transmitted light ray b is as follows: light source 3, aperture one 21, reflector one 55, reflector three 57, through frame three 54, measured lens 17, through frame six 64, relay mirror 68, reflector six 67, reflector four 65, through frame four 62, aperture two 22, detector 4;

[0054] Then, water in the water storage chamber 112 can be heated to generate water vapor, and the water vapor can be passed upward through the air inlet channel 19 into the inner cavity of the heating chamber 18, thereby filling the heating chamber 18. The inner wall of the placement ring 14 is heated to conduct heat to the outer ring of the tested lens 17, thereby increasing the temperature of the tested lens 17. The intensity of the light b passing through the tested lens 17 is captured by the detector 4, thereby detecting the transmittance of the tested lens 17 after the test variable temperature is increased.

[0055] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A medium-wave infrared lens transmittance detection device, comprising a workbench (1) and a protective cover (2), wherein a first aperture (21) and a second aperture (22) are respectively installed on both sides of the protective cover (2), a placement groove (7) is provided on the top of the workbench (1), and a light source (3) and a detector (4) are respectively installed on the top of the workbench (1) and located on the left and right sides of the protective cover (2), wherein: A support plate (8) and a guide column (9) are installed at the bottom of the workbench (1); a telescopic rod (10) is installed at the top of the support plate (8); a liquid storage block (11) is installed at the telescopic end of the telescopic rod (10); a connecting column (12) is fixedly connected to the top of the liquid storage block (11); a placement ring (14) is fixedly installed at the top of the connecting column (12); a lens to be tested (17) is installed inside the placement ring (14); and an input reflection mechanism (5) and an output reflection mechanism (6) are also installed inside the protective cover (2); The input reflection mechanism (5) comprises a placement frame 1 (51), a through frame 1 (52) is installed on the left side of the placement frame 1 (51), and a through frame 2 (53) and a through frame 3 (54) are installed at the front and rear ends of the right side respectively, a reflector 1 (55) is installed in the middle of the inner wall of the placement frame 1 (51), and a reflector 2 (56) and a reflector 3 (57) are installed at the front and rear sides of the inner wall of the placement frame 1 (51) respectively; The output reflection mechanism (6) comprises a second placement frame (61), a fifth through frame (63) and a sixth through frame (64) are respectively installed at the front and rear ends of the left side of the second placement frame (61), a fourth through frame (62) is installed at the right side, a fourth reflector (65) is installed at the middle of the inner wall of the second placement frame (61), a fifth reflector (66) and a sixth reflector (67) are respectively installed at the front and rear sides of the inner wall of the second placement frame (61), and a relay mirror (68) is installed inside the sixth through frame (64); The left and right ends of the liquid storage block (11) are respectively sleeved and adapted with the guide column (9); the liquid storage block (11) is adapted to be placed in the placement groove (7); the placement groove (7) is arranged at a middle front position on the top of the workbench (1); a partition (111) is fixedly installed in the middle of the inner cavity of the liquid storage block (11), and the inner cavity is sealed and divided into a water storage cavity (112) and a recovery cavity (113) by the partition (111); a balancing hole (15) is arranged on one side of the recovery cavity (113); an air intake channel (19) and an exhaust channel (20) are respectively arranged inside the connecting column (12); a heating cavity (18) is arranged inside the placement ring (14), and the heating cavity (18) is connected to the inner cavity of the liquid storage block (11) through the connecting column (12); the heating cavity (18) is connected to the water storage cavity (112) through the air intake channel (19); the heating cavity (18) is also connected to the water storage cavity (112) through the exhaust channel (20) is connected to the recovery chamber (113), the inner wall of the exhaust channel (20) is penetrated by a cooling mechanism (13), the outer surface of the cooling mechanism (13) is fixedly mounted with a condenser (131), the condenser (131) penetrates through the exhaust channel (20), the inner ring surface of the placement ring (14) is fixedly mounted with two groups of clamping rings (16), and the lens to be tested (17) is limitedly clamped between the two groups of clamping rings (16) by the clamping ring (16), so that the lens to be tested (17) can be removed or installed from the inner ring of the placement ring (14), the inner cavity of the water storage chamber (112) is filled with water, and a thermocouple is installed, the thermocouple is used to heat water and generate water vapor, and the water vapor movement path is: water storage chamber (112), air inlet channel (19), heating chamber (18), exhaust channel (20), recovery chamber (113).

2. The medium-wave infrared lens transmittance detection device according to claim 1, characterized in that: The input reflection mechanism (5), the output reflection mechanism (6) and the measured lens (17) respectively divide the light from the light source (3) into reflected light a and transmitted light b.

3. A medium-wave infrared lens transmittance detection device according to claim 2, characterized in that: The light path of the reflected light a is as follows: light source (3), aperture 1 (21), reflector 1 (55), reflector 2 (56), through frame 2 (53), through frame 5 (63), reflector 5 (66), reflector 4 (65), through frame 4 (62), aperture 2 (22), detector (4); The light path of the transmitted light b is as follows: light source (3), aperture 1 (21), reflector 1 (55), reflector 3 (57), through frame 3 (54), measured lens (17), through frame 6 (64), relay mirror (68), reflector 6 (67), reflector 4 (65), through frame 4 (62), aperture 2 (22), detector (4).

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