CN112083562A - Off-axis two-mirror imaging system with real exit pupil - Google Patents
Off-axis two-mirror imaging system with real exit pupil Download PDFInfo
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- CN112083562A CN112083562A CN202010817889.8A CN202010817889A CN112083562A CN 112083562 A CN112083562 A CN 112083562A CN 202010817889 A CN202010817889 A CN 202010817889A CN 112083562 A CN112083562 A CN 112083562A
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- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/02—Catoptric systems, e.g. image erecting and reversing system
- G02B17/06—Catoptric systems, e.g. image erecting and reversing system using mirrors only, i.e. having only one curved mirror
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- G—PHYSICS
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- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
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Abstract
The invention relates to an off-axis two-mirror imaging system with a real exit pupil, which comprises a main reflector, a primary reflector, a lens and a real exit pupil, wherein the main reflector is positioned on an incident light path of an incident light beam and reflects the incident light beam to form a first reflected light beam, the secondary reflector is positioned on a reflected light path of the main reflector and is used for reflecting the first reflected light beam to form a second reflected light beam, the second reflected light beam passes through the lens and the real exit pupil after passing through the incident light beam and reaches an image plane, and the secondary reflector and the lens are respectively positioned at two sides of the incident light beam.
Description
Technical Field
The invention relates to the field of optical design, in particular to an off-axis two-mirror imaging system.
Background
The off-axis reflection type optical imaging system has the advantages of high transmittance, wide imaging waveband range, no chromatic aberration and the like, and has a plurality of applications in the imaging field. To avoid reducing imaging efficiency by avoiding beam obscuration, the symmetry of off-axis systems is disrupted, some non-conventional and field-of-view dependent aberrations are introduced, and spherical and aspherical surfaces with rotational symmetry have less ability to correct such aberrations. The optical free-form surface is an optical surface which has no rotation symmetry and high design freedom degree, and can be used for correcting off-axis aberration and improving optical performance. In recent years, free-form surfaces have been increasingly used for off-axis reflective imaging systems, and many imaging systems with high performance have been realized.
At present, off-axis reflection type systems are also increasingly applied to infrared imaging, and have important application in vehicle-mounted obstacle avoidance systems and monitoring security systems. However, the off-axis reflective optical system has the problem of too large system volume to avoid beam blocking.
Disclosure of Invention
In view of the foregoing, it is desirable to provide an off-axis reflective imaging system with a compact and small size.
An off-axis two-mirror imaging system with an actual exit pupil comprises a main reflector, a primary reflector, a lens and an actual exit pupil, wherein the main reflector is positioned on an incident light path of an incident light beam and reflects the incident light beam to form a first reflected light beam, the secondary reflector is positioned on a reflected light path of the main reflector and is used for reflecting the first reflected light beam to form a second reflected light beam, the second reflected light beam passes through the lens and the actual exit pupil after passing through the incident light beam and reaches an image plane, and the secondary reflector and the lens are respectively positioned on two sides of the incident light beam.
Compared with the prior art, the off-axis two-mirror imaging system provided by the invention only uses two reflectors, has compact and simple structure and low cost, and can reduce the volume, weight and the like of the system; moreover, the imaging system is provided with a lens in front of an image surface, so that the width of partial beams of the reflector can be reduced, the aberration can be corrected by a free-form surface, the F number of the imaging system can be reduced, the field of view of the imaging system is improved, and higher imaging resolution and a wider observation range can be obtained; in addition, the imaging system further comprises a real exit pupil, which can improve the sensitivity of the system.
Drawings
Fig. 1 is an optical path diagram of an off-axis two-mirror imaging system with a real exit pupil according to an embodiment of the present invention.
Figure 2 is an MTF curve for each field of view of an off-axis two-mirror imaging system with a real exit pupil provided by an embodiment of the present invention.
Figure 3 is a graph of the average RMS wave aberration for each field of view of an off-axis two-mirror imaging system with a real exit pupil according to an embodiment of the present invention.
Description of the main elements
Off-axis two-mirror imaging system 100 with real exit pupil
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
The technical scheme of the invention is further detailed in the following description and the accompanying drawings in combination with specific embodiments.
Referring to fig. 1, an embodiment of the invention provides an off-axis two-mirror imaging system 100 with a real exit pupil. The off-axis two-mirror imaging system 100 with an actual exit pupil includes a primary mirror 102, a secondary mirror 104, a lens 106 and an actual exit pupil 108, which are disposed adjacent to each other and spaced apart from each other. The main reflecting mirror 102 is located on the incident light path of the incident light beam and reflects the incident light beam to form a first reflected light beam. The secondary mirror 104 is located on the reflection optical path of the primary mirror 102, and is used for reflecting the first reflection optical beam to form a second reflection optical beam. The lens 106 and the real exit pupil 108 are located in the reflected light path of the secondary mirror 104. The second reflected light beam passes through the incident light beam, passes through the lens 106 and the real exit pupil 108, and reaches the image plane 110. The secondary mirror 104 and the lens 106 are located on both sides of the incident light beam, respectively. The entrance pupil and the primary mirror 102 are located on either side of the second reflected beam.
The optical path of the off-axis two-mirror imaging system 100 with a real exit pupil when in operation is as follows: when the object is at infinity, the light beam emitted from the object first enters the reflective surface of the primary mirror 102, and is reflected by the reflective surface of the primary mirror 102 to form a first reflected light beam, which is then irradiated onto the reflective surface of the secondary mirror 104, and is then reflected by the reflective surface of the secondary mirror 104 to form a second reflected light beam, which finally reaches the image plane 110 through the lens 106 and the exit pupil 108. The light path of the second reflected light beam is crossed and partially overlapped with the light path of the incident light beam, so that the space can be fully utilized, and the volume of the system is reduced.
The reflecting surfaces of the primary mirror 102 and the secondary mirror 104 may be spherical surfaces, aspheric surfaces, or free-form surfaces, and in this embodiment, the reflecting surfaces of the primary mirror 102 and the secondary mirror 104 are both free-form surfaces. The materials of the primary mirror 102 and the secondary mirror 104 are not limited as long as they have high reflectivity. The primary mirror 102 and the secondary mirror 104 may be made of metal materials such as aluminum, copper, and the like, or inorganic non-metal materials such as silicon carbide, silicon dioxide, and the like. To further increase the reflectivity of the primary and secondary mirrors 102, 104, an antireflection film, which may be a gold film, may be coated on the respective reflective surfaces. The dimensions of the primary mirror 102 and the secondary mirror 104 are not limited.
For convenience of description, the space in which the off-axis two-mirror imaging system 100 with real exit pupil is located defines a global three-dimensional rectangular coordinate system (X, Y, Z), the space in which the primary mirror 102 is located defines a first local three-dimensional rectangular coordinate system (X ', Y ', Z '), and the space in which the secondary mirror 104 is located defines a second local three-dimensional rectangular coordinate system (X ", Y", Z "). In this embodiment, the center of the entrance pupil position of the off-axis two-mirror imaging system 100 with a real exit pupil is the origin of the global three-dimensional rectangular coordinate system, please refer to fig. 1, a horizontal straight line passing through the center of the entrance pupil is the Z axis, which is negative to the left and positive to the right, the Y axis is in the plane shown in fig. 1, which is positive to the bottom in the direction perpendicular to the Z axis, the X axis is perpendicular to the YZ plane, and the inward direction is positive to the outward direction in the direction perpendicular to the YZ plane.
In the global three-dimensional rectangular coordinate system (X, Y, Z), a first local three-dimensional rectangular coordinate system (X ', Y', Z ') is defined with a point on the main mirror 102 as an origin, and the reflection surface of the main mirror 102 and the position thereof are described by the first local three-dimensional rectangular coordinate system (X', Y ', Z'). In the global three-dimensional rectangular coordinate system (X, Y, Z), a second local three-dimensional rectangular coordinate system (X ", Y", Z ") is defined with a point on the sub-mirror 104 as an origin, and the reflecting surface of the sub-mirror 104 and the position thereof are described by the second local three-dimensional rectangular coordinate system (X", Y ", Z").
The origins of the first local three-dimensional rectangular coordinate system (X ', Y', Z ') and the second local three-dimensional rectangular coordinate system (X', Y ', Z') are located at different positions in the global three-dimensional rectangular coordinate system (X, Y, Z), respectively. Each of the first and second local coordinate systems (X ', Y ', Z ') may be regarded as a result of the global coordinate system (X, Y, Z) being translated such that an origin of the global coordinate system (X, Y, Z) coincides with an origin of the local coordinate system, and then rotated about an X-axis of the global coordinate system (X, Y, Z).
The first local three-dimensional rectangular coordinate system (X ', Y ', Z ') is obtained by translating the global three-dimensional rectangular coordinate system (X, Y, Z) along the positive direction of a Y axis and the positive direction of a Z axis, and the translation distance can be selected and set according to actual requirements. In this embodiment, the first local three-dimensional rectangular coordinate system (X ', Y ', Z ') is obtained by translating the global three-dimensional rectangular coordinate system (X, Y, Z) by about 140mm in the positive direction of the Y axis, then translating by about 82mm in the positive direction of the Z axis, and finally rotating by about 50 ° counterclockwise by using the X axis as a rotation axis; the origin of the first local three-dimensional rectangular coordinate system has coordinates (0, 140, 82) in the global three-dimensional rectangular coordinate system.
In the first local rectangular three-dimensional coordinate system (X ', Y ', Z '), the reflection surface of the main mirror 102 is a polynomial free-form surface of X ' Y ', and the equation of the polynomial free-form surface of X ' Y ' can be expressed as:
wherein z ' is the rise of the curved surface, c ' is the curvature of the curved surface, k ' is the coefficient of the quadric surface, Ai' is a coefficient of the i-th term in the polynomial. Since the off-axis two-mirror imaging system 100 is symmetric about the Y ' Z ' plane, only the even term of X ' may be retained. Preferably, the reflecting surface of the main mirror 102 is an x ' y ' polynomial free-form surface with an even-order term of x ' with the order of 6, and the equation of the x ' y ' polynomial free-form surface can be expressed as:
it should be noted that the degree of the highest order of the x 'y' polynomial free-form surface is not limited to 6, but may be 4, 8, 10, etc., and those skilled in the art can optimize the design according to the actual situation.
In this embodiment, the curvature c ', the conic coefficient k' and the coefficients A in the x 'y' polynomial of the reflection surface of the main mirror 102iSee table 1 for values of'. It will be understood that the curvature c ', the conic coefficient k', and the coefficients AiThe value of' is also not limited to that described in table 1 and can be adjusted by those skilled in the art according to actual needs.
TABLE 1 values of coefficients in the x 'y' polynomial of the reflecting surface of the main mirror
| c' | -7.010E-06 |
| k' | 1796500.188 |
| A3' | 5.097 |
| A4' | -3.947E-04 |
| A6' | -0.728E-03 |
| A8' | 9.930E-07 |
| A10' | 2.958E-06 |
| A11' | -1.987E-09 |
| A13' | -2.159E-08 |
| A15' | -5.642E-08 |
| A17' | -5.109E-11 |
| A19' | -7.645E-10 |
| A21' | -9.073E-10 |
| A22' | 7.512E-14 |
| A24' | -5.502E-13 |
| A26' | -0.929E-12 |
| A28' | 5.644E-12 |
In the global three-dimensional rectangular coordinate system (X, Y, Z), the second local three-dimensional rectangular coordinate system (X ', Y', Z ') is obtained by the translation of the first local three-dimensional rectangular coordinate system (X', Y ', Z') along the positive direction of the Y axis and the negative direction of the Z axis, and the translation distance can be selected and set according to actual needs. In this embodiment, the second local three-dimensional rectangular coordinate system (X ", Y", Z ") is obtained by translating the first local three-dimensional rectangular coordinate system (X ', Y ', Z ') by about 75mm in the positive direction of the Y axis, then by translating by about 54mm in the negative direction of the Z axis, and then by rotating by about 163 ° clockwise with the X axis as the rotation axis; the origin of the second local three-dimensional rectangular coordinate system is (0, 215, 28) in the global three-dimensional rectangular coordinate system.
In the second local rectangular three-dimensional coordinate system (X ", Y", Z "), the reflection surface of the secondary reflector 104 is a polynomial free-form surface of X" Y ", and the equation of the polynomial free-form surface of X" Y "can be expressed as:
wherein z ' is the rise of the curved surface, c ' is the curvature of the curved surface, k ' is the coefficient of the quadric surface, Ai"is the coefficient of the i-th term in the polynomial. Since the off-axis two-mirror imaging system 100 is symmetric about the Y "Z" plane, only the even term of X "may be retained. Preferably, the reflecting surface of the secondary reflector 104 is a free-form surface of an X "y" polynomial of an even term of X "with the degree of 8The equation for the x "y" polynomial free form surface can be expressed as:
it should be noted that the degree of the highest degree of the x "y" polynomial free-form surface is not limited to 8, but may be 4, 6, or 10, and the like, and those skilled in the art can optimize the design according to the actual situation.
In this embodiment, the curvature c, the conic coefficient k and the coefficients A of the x "y" polynomial of the reflecting surface of the secondary reflector 104iSee table 2 for values of. It will be appreciated that the curvature c ", the conic coefficient k" and the coefficients AiThe value of "is also not limited to that described in table 2, and can be adjusted by those skilled in the art according to actual needs.
TABLE 2 values of the coefficients in the x "y" polynomial of the reflecting surface of the subreflector
| c” | 2.785E-03 |
| k” | -25.690 |
| A3” | -1.504 |
| A4” | -7.782E-06 |
| A6” | 1.994E-06 |
| A8” | -0.773E-06 |
| A10” | -2.557E-06 |
| A11” | 1.591E-09 |
| A13” | 6.336E-09 |
| A15” | 3.260E-09 |
| A17” | 0.292E-11 |
| A19” | -1.342E-11 |
| A21” | 0.272E-11 |
| A22” | -2.464E-13 |
| A24” | -3.364E-12 |
| A26” | -1.903E-12 |
| A28” | -5.049E-13 |
| A30” | -2.383E-15 |
| A32” | 7.351E-15 |
| A34” | 6.224E-15 |
| A36” | 5.471E-16 |
| A37” | 0.581E-18 |
| A39” | 6.608E-18 |
| A41” | -2.978E-17 |
| A43” | -5.415E-17 |
| A45” | -0.465E-17 |
The lens 106, the real exit pupil 108 and the image plane 110 are all disposed on the light path of the second reflected light beam. The secondary reflector 104 is disposed at one side of the incident light path, and the lens 106, the real exit pupil 108 and the image plane 110 are disposed at the other side of the incident light path. The arrangement order of the lens 106 and the real exit pupil 108 on the optical path of the second reflected light beam is not limited; in one embodiment, the second reflected light passes through the lens 106, then through the real exit pupil 108, and finally reaches the image plane 110; in another embodiment, the second reflected light passes through the real exit pupil 108, then passes through the lens 106, and finally reaches the image plane 110.
The lens 106 is used for converging the second reflected light beam onto the image plane 110. The lens 106 includes a first surface 1061 and a second surface 1062, the first surface 1061 and the second surface 1062 are disposed opposite to each other, the first surface 1061 of the lens is an incident surface of the second reflected light, and the second surface 1062 of the lens is an exit surface of the second reflected light. In a global three-dimensional rectangular coordinate system (X, Y, Z), the lens 106 is offset from the secondary mirror 104 along the negative direction of the Y-axis, and the offset amount can be set according to actual needs. In this embodiment, in the global three-dimensional rectangular coordinate system (X, Y, Z), the lens 106 is offset from the secondary mirror 104 along the Y-axis negative direction by about 156mm, that is, the distance between the center of the first surface 1061 of the lens 106 and the origin of the second local three-dimensional rectangular coordinate system where the secondary mirror 104 is located along the Y-axis negative direction is about 237 mm; the lens 106 is offset from the secondary mirror 104 along the negative Z-axis by about 17mm, i.e., the distance between the center of the first surface 1061 of the lens 106 and the origin of the second local three-dimensional rectangular coordinate system of the secondary mirror 104 along the negative Z-axis is about 67 mm; the center of the first surface 1061 of the lens 106 has coordinates (0, -22, 11) in the global coordinate system.
The shape of the first surface 1061 and the second surface 1062 is not limited, and may be a spherical surface, an aspherical surface, or a free-form surface, and it is understood that the spherical surface and the aspherical surface are easier to machine than the free-form surface. Preferably, the first surface 1061 and the second surface 1062 are spherical or aspherical in shape. In this embodiment, the first surface 1061 and the second surface 1062 are both spherical surfaces, and the equation of the spherical surfaces can be expressed as:
wherein z is the high vector of the curved surface, and c is the curvature of the curved surface. In this embodiment, the radius of curvature of the first surface 1061 of the lens 106 is-126.23 mm, and in the spherical equation of the first surface 1061, c is-7.92205467E-3; the radius of curvature of the second surface 1062 of the lens 106 is-226.57 mm, and in the spherical equation of the second surface 1062, c is-4.41345335E-3. It is understood that the value of the curvature c is not limited to the embodiment, and can be adjusted by those skilled in the art according to the actual requirement.
The material and specification of the lens 106 are not limited, and can be selected according to actual needs. When the operating wavelength of the off-axis two-mirror imaging system 100 is in the visible range, the material of the lens 106 may be glass, plastic, etc.; when the operating wavelength of the off-axis two-mirror imaging system 100 is in the infrared range, the material of the lens 106 may be germanium, zinc sulfide, zinc selenide, or the like. The thickness of the lens 106 can be reduced as much as possible during design, so that the influence of chromatic aberration on the imaging quality can be reduced. In this embodiment, the central thickness of the lens is 3.0mm, the diameter of the lens is 40mm, and the lens is made of germanium.
The real exit pupil 108 is parallel to and opposite to the lens 106. The distance between the real exit pupil 108 and the lens 106 is not limited, and can be set according to actual needs; in this embodiment, the distance between the real exit pupil 108 and the second surface 1062 of the lens 106 is 10 mm. The specification of the real exit pupil 108 is not limited, and can be selected and set according to actual needs; in this embodiment, the radius of the real exit pupil 108 is 13 mm. The real exit pupil 108 can significantly suppress stray light, and diffracted light, thereby improving the signal-to-noise ratio of the imaging system 100 and enabling the imaging system 100 to have higher sensitivity.
After entering, the light beam is reflected by the primary mirror 102 and reaches the secondary mirror 104, and after being reflected by the secondary mirror 104, the light beam is received and imaged by the image plane 110 through the lens 106 and the real exit pupil 108. The image plane 110 is parallel to and opposite to the real exit pupil 108. The distance between the image plane 110 and the real exit pupil 108 is not limited, and can be set according to actual needs; in this embodiment, the distance from the real exit pupil 108 to the image plane is 33 mm. The image plane 110 may be disposed with any optical imaging device, or may be used as an entrance pupil of another optical system. In this embodiment, a photo detector is disposed at the position of the image plane 110.
In addition, the off-axis two-mirror imaging system 100 with a real exit pupil may further include an aperture stop, and the aperture stop may be located at the entrance pupil, on the primary mirror 102, on the secondary mirror 104, on the lens 106, at the real exit pupil 108 or at the image plane 110, or may be disposed in the incident light path of the incident light beam, the reflected light path of the primary mirror 102, the reflected light path of the secondary mirror 104 or between the lens 106 and the image plane 110. The aperture and the shape of the aperture diaphragm are not limited, and the aperture diaphragm can be specifically selected and arranged according to actual needs. In this embodiment, the aperture is disposed on the secondary reflector 104, and the aperture is a circle whose outer edge coincides with the outer edge of the secondary reflector.
The parameters of the off-axis two-mirror imaging system 100 with the real exit pupil, such as the field angle, the equivalent focal length, the entrance pupil diameter, and the F-number, can be set according to the actual situation. In this embodiment, the field angle of the off-axis two-mirror imaging system 100 is 5.8 ° × 4.2 °, the equivalent focal length is 150mm, and the F-number of the off-axis two-mirror imaging system 100 is 1.5. Of course, it should be understood that the values of the parameters of the off-axis two-mirror imaging system are not limited to those listed in the present embodiment, and other values of the parameters obtained according to the present invention should also be within the scope of the present invention.
The operating band of the off-axis two-mirror imaging system 100 with a real exit pupil is not limited, and may be a visible light band or an infrared band. In this embodiment, the off-axis two-mirror imaging system has an operating wavelength in the range of 8 microns to 16 microns. Of course, the operating wavelength of the off-axis two-mirror imaging system 100 is not limited to this embodiment, and can be adjusted according to actual needs.
Referring to fig. 2, for the modulation transfer function MTF of the partial field angle of the off-axis two-mirror imaging system 100 with the real exit pupil in the infrared band, it can be seen from the figure that the modulation degree of each field is at least 0.30 at 30lp/mm, and the MTF curve of each field substantially reaches the diffraction limit, indicating that the off-axis two-mirror imaging system 100 with the real exit pupil has high imaging quality.
Referring to fig. 3, the average RMS wave aberration diagram of each field of view of the off-axis two-mirror imaging system 100 with a real exit pupil, with an average value of 0.061 λ, where λ is 9110.9nm, shows that the imaging quality of the off-axis two-mirror imaging system 100 with a real exit pupil is very good.
The off-axis two-mirror imaging system with the real exit pupil provided by the invention adopts an off-axis two-mirror system, only two reflectors are used, the structure is compact, and the volume and the weight of the system can be reduced; the off-axis two-mirror imaging system is simple in structure, easy to design and process and easy to produce in batches; a thin common spherical lens is added in front of an image surface of the imaging system, so that the width of partial beams of the reflector can be reduced, the aberration can be corrected by a free-form surface, the F number of the imaging system can be further reduced, and the field of view of the system can be improved; the imaging system provides an actual exit pupil at the exit pupil location, which can significantly limit unwanted background radiation and improve signal-to-noise ratio.
The application field of the off-axis two-mirror imaging system 100 with the real exit pupil provided by the invention relates to earth observation, space target detection, astronomical observation, multispectral thermal imaging, stereo mapping, aerospace, unmanned driving and the like. The off-axis two-mirror imaging system 100 with the real exit pupil provided by the invention reaches the diffraction limit in the infrared band, and can be used under visible light or in the infrared band.
In addition, other modifications within the spirit of the invention will occur to those skilled in the art, and it is understood that such modifications are included within the scope of the invention as claimed.
Claims (10)
1. An off-axis two-mirror imaging system having a real exit pupil, comprising: the primary reflector is positioned on an incident light path of an incident beam and reflects the incident beam to form a first reflected beam, the secondary reflector is positioned on a reflected light path of the primary reflector and is used for reflecting the first reflected beam to form a second reflected beam, the second reflected beam passes through the incident beam and reaches an image plane through the lens and the actual exit pupil, and the secondary reflector and the lens are respectively positioned on two sides of the incident beam.
2. The off-axis two-mirror imaging system with a real exit pupil of claim 1, wherein the primary mirror and the entrance pupil are located on either side of the second reflected beam.
3. The off-axis two-mirror imaging system with a real exit pupil of claim 1, wherein the optical path of the second reflected beam intersects and partially overlaps with the optical path of the incident beam.
4. The off-axis two-mirror imaging system with a real exit pupil of claim 1 wherein the reflective surfaces of the primary and secondary mirrors are free-form surfaces.
5. The off-axis two-mirror imaging system with a real exit pupil of claim 1, wherein the lens comprises opposing first and second surfaces, each of the first and second surfaces being spherical.
6. An off-axis two-mirror imaging system with a real exit pupil according to claim 1, characterized in that a global three-dimensional rectangular coordinate system is defined with the center of the entrance pupil position of the off-axis two-mirror imaging system with a real exit pupil as the origin, in which a first local three-dimensional rectangular coordinate system (X ', Y ', Z ') is defined with a point on the primary mirror as the origin, and a second local three-dimensional rectangular coordinate system (X ", Y", Z ") is defined with a point on the secondary mirror as the origin, the first local three-dimensional rectangular coordinate system (X ', Y ', Z ') being obtained by translating the global three-dimensional rectangular coordinate system (X, Y, Z) in the positive Y-axis direction and the positive Z-axis direction, the second local three-dimensional rectangular coordinate system (X", Y ", Z") being obtained by translating the first local three-dimensional rectangular coordinate system (X ', y ', Z') is translated in the positive Y-axis direction and the negative Z-axis direction, and the lens is deviated from the secondary mirror in the negative Y-axis direction.
7. An off-axis two-mirror imaging system with a real exit pupil according to claim 1, wherein a first local three-dimensional rectangular coordinate system (X ', Y', Z ') is defined with a point on the primary mirror as the origin, the reflecting surface of the primary mirror being a free-form surface of X' Y 'polynomial of even-order term of X' of order 6, the equation for the free-form surface of X 'Y' polynomial being expressed as:
wherein z ' is the rise of the curved surface, c ' is the curvature of the curved surface, k ' is the coefficient of the quadric surface, Ai' is a coefficient of the i-th term in the polynomial.
8. An off-axis two-mirror imaging system with a real exit pupil according to claim 7, wherein c '-7.010E-06, k' -1796500.188, a3'＝5.097，A4'＝-3.947E-04，A6'＝-0.728E-03，A8'＝9.930E-07，A10'＝2.958E-06，A11'＝-1.987E-09，A13'＝-2.159E-08，A15'＝-5.642E-08，A17'＝-5.109E-11，A19'＝-7.645E-10，A21'＝-9.073E-10，A22'＝7.512E-14，A24'＝-5.502E-13，A26'＝-0.929E-12，A28'＝5.644E-12。
9. An off-axis two-mirror imaging system with a real exit pupil according to claim 1, wherein a second local three-dimensional rectangular coordinate system (X ", Y", Z ") is defined with a point on the secondary mirror as the origin, and the reflecting surface of the secondary mirror is an X" Y "polynomial free-form surface of even-order terms of X' of order 8, the equation of the X" Y "polynomial free-form surface being expressed as:
wherein z ' is the rise of the curved surface, c ' is the curvature of the curved surface, k ' is the coefficient of the quadric surface, Ai"is the coefficient of the i-th term in the polynomial.
10. An off-axis two-mirror imaging system with a real exit pupil of claim 9 wherein c "2.785E-03, k" 25.690, a3”＝-1.504，A4”＝-7.782E-06，A6”＝1.994E-06，A8”＝-0.773E-06，A10”＝-2.557E-06，A11”＝1.591E-09，A13”＝6.336E-09，A15”＝3.260E-09，A17”＝0.292E-11，A19”＝-1.342E-11，A21”＝0.272E-11，A22”＝-2.464E-13，A24”＝-3.364E-12，A26”＝-1.903E-12，A28”＝-5.049E-13，A30”＝-2.383E-15，A32”＝7.351E-15，A34”＝6.224E-15，A36”＝5.471E-16，A37”＝0.581E-18，A39”＝6.608E-18，A41”＝-2.978E-17，A43”＝-5.415E-17，A45”＝-0.465E-17。
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| CN114488497A (en) * | 2021-12-31 | 2022-05-13 | 清华大学 | Real exit pupil off-axis reflective optical system |
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