CN109343206B - Infrared optical system and optical equipment - Google Patents
Infrared optical system and optical equipment Download PDFInfo
- Publication number
- CN109343206B CN109343206B CN201811140262.2A CN201811140262A CN109343206B CN 109343206 B CN109343206 B CN 109343206B CN 201811140262 A CN201811140262 A CN 201811140262A CN 109343206 B CN109343206 B CN 109343206B
- Authority
- CN
- China
- Prior art keywords
- mirror
- optical system
- reflector
- infrared
- group
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 109
- 238000003384 imaging method Methods 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims description 19
- 230000005855 radiation Effects 0.000 claims description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 229910052790 beryllium Inorganic materials 0.000 claims description 2
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 claims description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 2
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 2
- 239000002241 glass-ceramic Substances 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 7
- 239000013078 crystal Substances 0.000 description 15
- 238000000034 method Methods 0.000 description 7
- 238000005057 refrigeration Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 229910052732 germanium Inorganic materials 0.000 description 5
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 5
- 210000001747 pupil Anatomy 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 239000005387 chalcogenide glass Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000003331 infrared imaging Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/08—Optical arrangements
- G01J5/0808—Convex mirrors
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B17/00—Systems with reflecting surfaces, with or without refracting elements
- G02B17/08—Catadioptric systems
- G02B17/0836—Catadioptric systems using more than three curved mirrors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J2005/0077—Imaging
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Lenses (AREA)
- Microscoopes, Condenser (AREA)
Abstract
The invention provides an infrared optical system and optical equipment, which adopt a coaxial refraction and reflection type optical structure, can realize medium-wave or long-wave infrared band long focal length and large relative aperture imaging, and obviously improve the detection capability of the infrared optical system, and in addition, the miniaturization of the large-aperture long-focal-length infrared optical system is realized by utilizing the high-gradient large-numerical-aperture main mirror, the large-magnification afocal light path and the layout of a 'chignon' light path, and the thickness of the optical system in the optical axis direction is only 0.20-0.60 of the focal length.
Description
Technical Field
The invention relates to the field of infrared optical detection, in particular to an infrared optical system and optical equipment.
Background
The infrared optical system has the advantages of good environmental adaptability, high concealment, strong anti-interference capability and the like, is widely applied to various fields of military affairs, medical treatment, security protection, electric power, remote sensing, industry and the like, and also provides higher requirements for the design of the infrared imaging system along with the increasing application of the infrared optical system.
Three measures can be taken to improve the detection capability of the infrared optical system: firstly, a high-sensitivity refrigeration type infrared detector is adopted; secondly, the effective aperture of the infrared optical system is increased; and thirdly, the transmittance of the infrared optical system is improved. Therefore, an infrared optical system having high resolution and high sensitivity requires the use of a refrigeration-type detector and a large-caliber, long-focal-length optical system. However, the components of the refrigeration infrared type detector, such as the refrigeration dewar component, are large in size, and the position of the aperture stop of the optical system for the refrigeration type infrared detector is fixed, which is not favorable for reducing the size of the optical system and shortening the optical path. Meanwhile, the optical system with large caliber and long focal length is also not beneficial to the miniaturization of the optical system.
Disclosure of Invention
The embodiment of the invention provides an infrared optical system and optical equipment, which adopt a coaxial catadioptric optical structure, can realize imaging with long focal length and large relative aperture in a medium-wave or long-wave infrared band, and obviously improve the detection capability of the infrared optical system.
In a first aspect, the present invention provides an infrared optical system, the system includes a primary mirror, a secondary mirror, a collimating mirror group, a focusing mirror group and a relay mirror group arranged along a same optical axis, a reflecting surface of the primary mirror and a reflecting surface of the secondary mirror are arranged oppositely, a central hole is arranged at a center of the primary mirror, the collimating mirror group is located in the central hole, a coaxial catadioptric optical structure is further arranged between the collimating mirror group and the focusing mirror group, the coaxial catadioptric optical structure includes a first reflecting mirror, a second reflecting mirror, a third reflecting mirror and a fourth reflecting mirror, rotating shafts of the first reflecting mirror and the second reflecting mirror are perpendicular to each other, target thermal radiation reaches the primary mirror, is reflected by the primary mirror and the secondary mirror to form a first image plane, and forms a beam-shrinking parallel light beam after passing through the collimating mirror group, the shrinking parallel light beam is reflected by the first reflecting mirror, and the refracted beam-shrinking parallel light beams pass through the focusing mirror group and the third reflector to complete 90-degree refraction and focusing of the light beams in the horizontal direction, so that the target is imaged on a second image surface, the refracted beam-shrinking parallel light beams are reflected by a fourth reflector to complete 90-degree refraction of the light beams in the horizontal direction and reach the relay mirror group, and the relay mirror group transforms the target on the second image surface into an image.
Optionally, the primary mirror is a concave aspheric mirror, the secondary mirror is a convex aspheric mirror, and the reflecting surface of the primary mirror and the reflecting surface of the secondary mirror are standard quadric surfaces or high-order aspheric surfaces.
Optionally, the primary mirror or the secondary mirror is made of aluminum, silicon carbide, beryllium aluminum, and microcrystalline glass.
Optionally, the shapes of the reflecting surfaces of the primary mirror and the secondary mirror are the same or different.
Optionally, the first reflector is an azimuth image motion compensation reflector, and the rotation angle is less than or equal to 1 °; the second reflector is an image motion compensation reflector in the pitching direction, and the rotation angle is less than or equal to 1 degree;
optionally, the collimating lens is made of silicon, germanium or chalcogenide glass, and front and back surfaces of the collimating lens are spherical surfaces or quadric surfaces;
the focusing lens is made of silicon, germanium or chalcogenide glass, and the front surface and the rear surface of the focusing lens are spherical surfaces or quadric surfaces;
each relay lens is made of silicon, germanium or chalcogenide glass, and the front surface and the rear surface of each relay lens can be spherical surfaces or quadric surfaces.
Optionally, the optical system further comprises a focal plane detector, the focal plane detector comprises a window, a cold stop and a focal plane array, the cold stop is placed between the window and the focal plane array, the relay lens group is used for transferring an image of the target on the second image plane, and the focal plane array is refocused on the focal plane array through the window and the cold stop, and the focal plane array is coincident with the third image plane.
Optionally, the focal plane detector is a refrigeration-type detector.
Optionally, the primary mirror, the secondary mirror and the collimating mirror group form an afocal light path, and the focusing mirror group and the relay mirror group form an imaging light path.
In a second aspect, the present invention also provides an optical apparatus having the above infrared optical system.
According to the technical scheme, the embodiment of the invention has the following advantages:
the invention provides an infrared optical system and optical equipment, which adopt a coaxial refraction and reflection type optical structure, can realize medium-wave or long-wave infrared band long focal length and large relative aperture imaging, and obviously improve the detection capability of the infrared optical system, and in addition, the miniaturization of the large-aperture long-focal-length infrared optical system is realized by utilizing the high-gradient large-numerical-aperture main mirror, the large-magnification afocal light path and the layout of a 'chignon' light path, and the thickness of the optical system in the optical axis direction is only 0.20-0.60 of the focal length.
Drawings
Fig. 1 is a schematic structural diagram of a coaxial catadioptric optical system of an infrared medium wave optical system according to a first embodiment of the present invention.
FIG. 2 is a primary mirror front plate pattern of an infrared medium wave optical system according to a first embodiment of the present invention;
fig. 3 is a diagram of a back plate directional diagram of a primary mirror of an optical system of an infrared medium wave optical system according to a first embodiment of the present invention.
Fig. 4 is a schematic MTF curve of the infrared medium-wave optical system in the middle-wave band according to the first embodiment of the present invention.
FIG. 5 is a schematic structural diagram of a coaxial catadioptric optical system of an infrared long-wave optical system according to a first embodiment of the present invention.
FIG. 6 is a schematic diagram of an MTF curve of an infrared long-wave optical system in a long-wave band according to a first embodiment of the present invention.
In the figure: 1 is a primary mirror; 2 is a secondary mirror; 3 is a first image plane; 4 is a collimating lens group; r1 is a first mirror; r2 is a second mirror; r3 is a third mirror; r4 is a fourth mirror; 5 is a focusing lens group; 6 is a second image plane; 7 is a relay lens group; 8 is a focal plane detector; 81 is a window; 82 is a cold stop; 83 is a focal plane array.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The present invention provides first and second embodiments, as shown in connection with figures 1, 2, 3, 4, 5 and 6. The invention provides an infrared optical system, which comprises a primary mirror 1, a secondary mirror 2, a collimating mirror group 4, a focusing mirror group 5 and a relay mirror group 7 which are arranged along the same optical axis, wherein the primary mirror 1, the secondary mirror 2 and the collimating mirror 4 form an afocal optical path, the focusing mirror group 5 and the relay mirror 7 form an imaging optical path, the reflecting surface of the primary mirror 1 and the reflecting surface of the secondary mirror 2 are oppositely arranged, the center of the primary mirror 1 is provided with a central hole, the collimating mirror group 4 is positioned in the central hole, a coaxial catadioptric optical structure is further arranged between the collimating mirror group 4 and the focusing mirror group 5, the coaxial catadioptric optical structure comprises a first reflecting mirror R1, a second reflecting mirror R2, a third reflecting mirror R3 and a fourth reflecting mirror R4, the first reflecting mirror R1, the second reflecting mirror R2, the third reflecting mirror R3 and the fourth reflecting mirror R4 are arranged at an angle of 45 degrees, the rotation axes of the first reflector R1 and the second reflector R2 are perpendicular to each other.
Light beams from an object space are reflected by the primary mirror 1 and then incident on the secondary mirror 2, and are reflected and focused by the secondary mirror 2, so that a target is imaged on a first image surface 3; then the beam is condensed and parallel light beams are formed after passing through a collimating lens group 4; the beam-shrinking parallel light beams are firstly reflected by a first reflector R1 to realize 90-degree deflection in the horizontal direction; and then reflected by a second reflector R2 to realize 90-degree vertical turning. The rotating shafts of the first reflector and the second reflector are vertical to each other; then, the folded parallel light beams pass through a focusing mirror group 5 and a third reflector R3 to realize 90-degree folded focusing of the light beams in the horizontal direction, so that the target is imaged on a second image surface 6; and then reflected by a fourth reflector R4, so that the light beam is refracted by 90 degrees in the horizontal direction to reach the relay lens group 7, the relay lens group 7 transfers the image of the target on the second image plane 6, the target passes through a window 81 and a cold stop 82 of the focal plane detector 8 and is focused on the focal plane array 83 again, and the focal plane array 83 coincides with the third image plane.
All optical elements of the system are arranged on the same optical axis, the reflecting surface of the primary mirror 1 and the reflecting surface of the secondary mirror 2 are oppositely arranged, the primary mirror 1 and the secondary mirror 2 form a front group Cassegrain type optical system, the collimating lens group 4 is arranged in a central hole of the primary mirror 1, and all the optical elements of a rear light path of the collimating lens group 4 are arranged on a back plate of the primary mirror 1. The collimating and focusing mirrors 4, 5 are arranged between the first and second image planes 3, 6. The relay lens group 7 is arranged between the second image plane 6 and the focal plane detector 8 with the cold stop 82 between the window 81 and the focal plane array 83.
1. A first embodiment of the invention is shown in figures 1, 2, 3 and 4.
The first embodiment of the present invention is a coaxial catadioptric mid-wave infrared optical system, which is divided into an afocal optical path and an imaging optical path, with parallel optical paths as boundaries. The afocal light path is composed of a primary mirror 1, a secondary mirror 2 and a collimating mirror group 4, the imaging light path is composed of a focusing mirror group 5 and a relay mirror group 7, and the focal plane detector 8 is a medium wave infrared focal plane array and is used for imaging heat radiation of 3.7-4.8 μm in an electromagnetic spectrum.
The reflecting surface of the primary mirror 1 and the reflecting surface of the secondary mirror 2 are standard quadric surfaces, namely paraboloids, ellipsoids or hyperboloids, and can also be high-order aspheric surfaces; the concave reflecting surface of the primary mirror 1 and the reflecting surface of the secondary mirror 2 may have the same or different surface shapes.
The collimator lens group 4 is composed of a first collimator lens 41, a second collimator lens 42 and a second collimator lens 43 which are sequentially disposed along the same optical axis. The first collimating lens 41 is based on a ZnS crystal material, and the front surface of the first collimating lens is a concave spherical lens, and the rear surface of the first collimating lens is a convex spherical lens; the second collimating lens 42 is based on a Si crystal material, and its front surface is a concave spherical lens and its rear surface is a convex aspherical lens; the third collimating lens 43 is based on a Si crystal material, and its front surface is a planar lens and its rear surface is a convex aspheric lens.
The focusing mirror group 5 is composed of a first focusing lens 51 and a second focusing lens 52 which are sequentially disposed along the same optical axis. The first focusing lens 51 is based on a Si crystal material, and the front surface of the first focusing lens is a convex spherical lens, and the rear surface of the first focusing lens is a concave spherical lens; the second focusing lens 52 is based on a Ge crystal material, and the front surface thereof is a concave spherical lens and the rear surface thereof is a planar lens.
The relay lens group 7 is composed of a first relay lens 71, a second relay lens 72, a third relay lens 73, and a fourth relay lens 74, which are sequentially disposed along the same optical axis. The first relay lens 71 is made of a Si crystal material, and has convex spherical surfaces on both front and rear surfaces. The second relay lens 72 is based on a Si crystal material, and has a convex spherical surface on the front surface and a concave spherical surface on the rear surface. The third relay lens 73 is based on a Ge crystal material, and has a convex spherical front surface and a concave spherical rear surface. The fourth relay lens 74 is based on a Si crystal material, and has a convex spherical surface on the front surface and a concave spherical surface on the rear surface.
The focal plane detector 8 is a refrigeration type detector and comprises a window 81, a cold stop 82 and a focal plane array 83, wherein the window 81 is based on an infrared transmission material, such as germanium; the focal plane array 83 is a medium wave focal plane array; the cold stop 82 is placed between the window 81 and the focal plane array 83 to determine the solid angle at which the focal plane array receives the target radiation, the cold stop 82 serves as the exit pupil of the optical system, and the entrance pupil of the object space conjugated with the cold stop is coincident with the primary mirror as much as possible, thereby effectively reducing the aperture of the primary mirror.
The infrared optical system provided by the first embodiment of the invention can realize medium-wavelength infrared long focal length and large relative aperture imaging, has a compact structure and small distortion, and has a transfer function reaching or approaching a diffraction limit and cold stop matching reaching 100%.
Referring to fig. 4, an infrared optical system provided by a first embodiment of the present invention adopts a medium-wave coaxial catadioptric structure, and specifically, MTF of image quality of a medium-wave band at a spatial frequency 21lp/mm of a detector is greater than 0.3, as shown in fig. 4. The technical indexes of the system are as follows:
optical transfer function: the MTF of the whole visual field is required to be more than 0.3 when the spatial frequency is 21 lp/mm;
table 1 shows specific optical parameters of the optical system of this embodiment.
TABLE 1
2. A second embodiment of the invention is shown in figures 5 and 6.
A first embodiment of the present invention is a coaxial catadioptric long-wave infrared optical system that is divided into an afocal optical path and an imaging optical path bounded by parallel optical paths. The afocal light path is composed of a primary mirror 1, a secondary mirror 2 and a collimating mirror group 4, the imaging light path is composed of a focusing lens 5 and a relay mirror group 7, and the focal plane detector 8 is a long-wave infrared focal plane array and is used for imaging 7.7-9.5 mu m thermal radiation in an electromagnetic spectrum.
The reflecting surface of the primary mirror 1 and the reflecting surface of the secondary mirror 2 are standard quadric surfaces, namely paraboloids, ellipsoids or hyperboloids, and can also be high-order aspheric surfaces; the concave reflecting surface of the primary mirror 1 and the reflecting surface of the secondary mirror 2 may have the same or different surface shapes.
The collimator lens group 4 is composed of a first collimator lens 41 and a second collimator lens 42 which are sequentially disposed along the same optical axis. The first collimating lens 41 is based on a ZnS crystal material, and the front surface of the first collimating lens is a concave spherical lens, and the rear surface of the first collimating lens is a convex spherical lens; the second collimating lens 42 is based on a Si crystal material, and its front surface is a concave spherical lens and its rear surface is a convex aspherical lens.
The focusing lens 5 is based on a Ge crystal material, and the front surface of the focusing lens is a convex spherical lens, and the rear surface of the focusing lens is a concave lens.
The relay lens group 7 is composed of a first relay lens 71, a second relay lens 72, and a third relay lens 73, which are sequentially disposed along the same optical axis. The first relay lens 71 is based on Ge crystal material, and has a concave spherical lens on its front surface and a convex spherical lens on its rear surface. The second relay lens 72 is based on Ge crystal material, and its front surface is a convex spherical lens and its rear surface is a concave spherical lens. The third relay lens 73 is based on ZnS crystal material, and its front surface is a convex spherical lens and its rear surface is a concave spherical lens.
The focal plane detector 8 is a refrigeration type detector and comprises a window 81, a cold stop 82 and a focal plane array 83, wherein the window 81 is based on an infrared transmission material, such as germanium; the focal plane array 83 is a medium wave focal plane array; the cold stop 82 is placed between the window 81 and the focal plane array 83 to determine the solid angle at which the focal plane array receives the target radiation, the cold stop 82 serves as the exit pupil of the optical system, and the entrance pupil of the object space conjugated with the cold stop is coincident with the primary mirror as much as possible, thereby effectively reducing the aperture of the primary mirror.
The infrared optical system provided by the second embodiment of the invention can realize long-wave infrared long-focus imaging and large relative aperture imaging, has a compact structure and small distortion, and has a transfer function reaching or approaching the diffraction limit and cold stop matching reaching 100%.
Referring to fig. 6, an infrared optical system provided by the second embodiment of the present invention adopts a long-wave coaxial catadioptric structure, and specifically, the MTF of the image quality of the long-wave band at the spatial frequency of 16.7lp/mm of the detector is greater than 0.3, as shown in fig. 6. The technical indexes of the system are as follows:
optical transfer function: the MTF of the whole field of view is required to be more than 0.3 when the spatial frequency is 16.7 lp/mm;
table 2 shows specific optical parameters of the optical system of this embodiment.
The optical system of the invention has the advantages that:
(1) strong detection capability
The compact infrared optical system provided by the invention adopts a coaxial catadioptric optical structure, can realize medium-wave or long-wave infrared band long-focus and large-relative-aperture imaging, and obviously improves the detection capability of the infrared optical system.
(2) Small volume and good fitting performance
The infrared optical system is compact in structure and small in size, and miniaturization of the large-caliber long-focus infrared optical system can be realized.
(3) High temperature adaptability and high imaging quality
The passive athermal design is realized by reasonably matching infrared optical materials with different thermal expansion coefficients and optimizing the linear expansion coefficient of the secondary mirror supporting seat of the afocal light path. After no thermalization, the imaging quality is close to the diffraction limit and the performance is stable in the temperature range of minus 30 ℃ to 60 ℃.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (8)
1. An infrared optical system is characterized in that the system comprises a primary mirror, a secondary mirror, a collimating mirror group, a focusing mirror group and a relay mirror group which are arranged along the same optical axis, the reflecting surface of the primary mirror and the reflecting surface of the secondary mirror are oppositely arranged, a central hole is arranged at the center of the primary mirror, the collimating mirror group is positioned in the central hole, a coaxial catadioptric optical structure is arranged between the collimating lens group and the focusing lens group and between the focusing lens group and the relay lens group, the coaxial catadioptric optical structure comprises a first reflector, a second reflector, a third reflector and a fourth reflector, the rotation directions of the first reflector and the second reflector when image motion compensation is carried out are vertical to each other, the first reflector is an azimuth direction image motion compensation reflector and has a rotation angle of less than or equal to 1 degree, and the second reflector is a pitch direction image motion compensation reflector and has a rotation angle of less than or equal to 1 degree; the thermal radiation of the target reaches the primary mirror, the thermal radiation of the target passes through the primary mirror and the secondary mirror to form a first image surface, the thermal radiation of the target passes through the collimating mirror group to form a beam-shrinking parallel light beam, the beam-shrinking parallel light beam is reflected by the first reflecting mirror to complete 90-degree deflection in the horizontal direction, the beam-shrinking parallel light beam is reflected by the second reflecting mirror to complete 90-degree deflection in the vertical direction, the deflected beam-shrinking parallel light beam passes through the focusing mirror group and the third reflecting mirror to complete 90-degree deflection focusing in the horizontal direction of the light beam, so that the target is imaged on a second image surface, and then the reflected light beam is reflected by the fourth reflecting mirror to complete 90-degree deflection in the horizontal direction of the light beam to reach the relay mirror group.
2. The infrared optical system according to claim 1, characterized in that the primary mirror is a concave aspherical mirror and the secondary mirror is a convex aspherical mirror, and the reflecting surface of the primary mirror and the reflecting surface of the secondary mirror are standard quadric surfaces or high-order aspherical surfaces.
3. The infrared optical system of claim 1, characterized in that the material of the primary or secondary mirror is aluminum, silicon carbide, beryllium aluminum, glass-ceramic.
4. The infrared optical system according to claim 2, characterized in that the surface shapes of the reflecting surfaces of the primary mirror and the secondary mirror are the same or different.
5. The infrared optical system of claim 1, further comprising a focal plane detector comprising a window, a cold stop, and a focal plane array, the cold stop being disposed between the window and the focal plane array, an object on a second image plane being relayed by the relay lens set, and refocusing the focal plane array through the window and the cold stop, the focal plane array being coincident with a third image plane.
6. The infrared optical system of claim 5, characterized in that the focal plane detector is a refrigeration-type detector.
7. The infrared optical system of claim 1, wherein the primary mirror, secondary mirror, and collimating mirror comprise an afocal optical path, and the focusing mirror and relay mirror comprise an imaging optical path.
8. An optical device characterized by having the infrared optical system as set forth in any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811140262.2A CN109343206B (en) | 2018-09-28 | 2018-09-28 | Infrared optical system and optical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811140262.2A CN109343206B (en) | 2018-09-28 | 2018-09-28 | Infrared optical system and optical equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109343206A CN109343206A (en) | 2019-02-15 |
| CN109343206B true CN109343206B (en) | 2020-09-01 |
Family
ID=65307323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811140262.2A Active CN109343206B (en) | 2018-09-28 | 2018-09-28 | Infrared optical system and optical equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109343206B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11668915B2 (en) | 2019-08-11 | 2023-06-06 | Youngwan Choi | Dioptric telescope for high resolution imaging in visible and infrared bands |
| CN114616502A (en) | 2019-08-11 | 2022-06-10 | 崔荣完 | Small form factor four mirror based imaging system |
| US11579430B2 (en) | 2019-08-11 | 2023-02-14 | Youngwan Choi | Small form factor, multispectral 4-mirror based imaging systems |
| CN111007659B (en) * | 2019-12-23 | 2021-08-20 | 中国科学院长春光学精密机械与物理研究所 | Multi-band confocal plane infrared optical imaging system |
| CN111238449A (en) * | 2020-01-16 | 2020-06-05 | 中国科学院西安光学精密机械研究所 | Total reflection type underwater camera suitable for deep sea environment |
| US11860345B2 (en) * | 2021-04-23 | 2024-01-02 | Bae Systems Information And Electronic Systems Integration Inc. | Midwave infrared discrete zoom lens |
| CN113805325A (en) * | 2021-09-17 | 2021-12-17 | 航天科工微电子系统研究院有限公司 | Long-focus large-view-field miniaturized active athermal optical system |
| CN114236796B (en) * | 2021-12-17 | 2023-05-16 | 中国科学院长春光学精密机械与物理研究所 | Visible light-medium wave infrared afocal optical system |
| CN115265781B (en) * | 2022-07-14 | 2024-04-09 | 长春理工大学 | System and method for rapidly acquiring plane array polarized spectrum image |
| CN117055188B (en) * | 2023-10-13 | 2023-12-12 | 长春国宇光学科技有限公司 | Method for installing and adjusting coaxial three-reflector remote sensing optical system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011175082A (en) * | 2010-02-24 | 2011-09-08 | Crystal System:Kk | Telescope |
| CN103345051A (en) * | 2013-07-02 | 2013-10-09 | 中国科学院长春光学精密机械与物理研究所 | Double-film refraction and reflection type co-detector imaging system |
| CN108333729A (en) * | 2018-02-06 | 2018-07-27 | 中国科学院光电技术研究所 | A kind of heavy caliber infrared optical system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106772949B (en) * | 2017-02-22 | 2021-04-13 | 苏州大学 | Missile-borne athermal medium-long wave infrared dual-band telescopic imaging objective lens |
-
2018
- 2018-09-28 CN CN201811140262.2A patent/CN109343206B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011175082A (en) * | 2010-02-24 | 2011-09-08 | Crystal System:Kk | Telescope |
| CN103345051A (en) * | 2013-07-02 | 2013-10-09 | 中国科学院长春光学精密机械与物理研究所 | Double-film refraction and reflection type co-detector imaging system |
| CN108333729A (en) * | 2018-02-06 | 2018-07-27 | 中国科学院光电技术研究所 | A kind of heavy caliber infrared optical system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109343206A (en) | 2019-02-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109343206B (en) | Infrared optical system and optical equipment | |
| CN103345051B (en) | Bimodulus refraction-reflection is detector image-forming system altogether | |
| CN106990517B (en) | Large-relative-aperture long-focus uncooled infrared athermalized optical system | |
| CN103207452B (en) | Two waveband is the confocal surface imaging system of light path altogether | |
| KR100258710B1 (en) | Solid catadioptric lens | |
| US9846298B2 (en) | Off-axis three-mirror optical system with freeform surfaces | |
| CN105372796A (en) | Refrigeration type common-caliber medium/long-wave infrared double-waveband double-view-field dual-shift zoom optical system | |
| CN107121769B (en) | A kind of long wave linear array type scanned infrared imaging optical system | |
| CN102495474A (en) | Visible light/long-wave infrared broad band spectrum joint focusing optical imaging system | |
| US20200218055A1 (en) | Long-wave infrared optical system for observing devices using the principle of the Cassegrain telescope | |
| CN105319669A (en) | Two-wave-band infrared optical system | |
| CN110632748A (en) | Modular refraction and reflection type medium wave infrared athermal lens | |
| CN111007659B (en) | Multi-band confocal plane infrared optical imaging system | |
| CN109597187A (en) | A kind of large-aperture long-focus is passively without thermalization visible light optical system | |
| CN116243470A (en) | Focusing ultra-long wave infrared optical imaging system used under low temperature condition | |
| Meng et al. | Off-axis three-mirror freeform optical system with large linear field of view | |
| CN110398828A (en) | A kind of wide spectrum object lens of large relative aperture mid-long wavelength IR images optical system | |
| CN112305739B (en) | Infrared dual-band imaging optical system combining common optical path wide and narrow fields of view | |
| CN210742601U (en) | Modular refraction and reflection type medium wave infrared athermal lens | |
| CN105181136A (en) | Long-wave infrared imaging spectrometer optical system | |
| CN112363305A (en) | Microminiature medium wave infrared continuous zooming optical system | |
| CN108152241B (en) | Long-wave infrared imaging optical system | |
| CN110850574A (en) | Large-caliber multiband refraction and reflection front telescope optical system | |
| Shectman | Optical design of the Magellan Project 6.5-meter telescope | |
| CN114415358B (en) | Catadioptric optical system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |