CN111090170A - 5-fold wavelength double-view-field two-gear zooming infrared optical system - Google Patents
5-fold wavelength double-view-field two-gear zooming infrared optical system Download PDFInfo
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- CN111090170A CN111090170A CN202010038977.8A CN202010038977A CN111090170A CN 111090170 A CN111090170 A CN 111090170A CN 202010038977 A CN202010038977 A CN 202010038977A CN 111090170 A CN111090170 A CN 111090170A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 62
- 229910052732 germanium Inorganic materials 0.000 claims abstract description 25
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims abstract description 25
- 239000013078 crystal Substances 0.000 claims abstract description 24
- 230000005499 meniscus Effects 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000006073 displacement reaction Methods 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 230000009977 dual effect Effects 0.000 claims 3
- 238000009434 installation Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 7
- 238000012546 transfer Methods 0.000 description 6
- 238000003384 imaging method Methods 0.000 description 4
- 230000004075 alteration Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000005387 chalcogenide glass Substances 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 241000605314 Ehrlichia Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
- G02B15/173—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +-+
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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Abstract
The invention discloses a 5-time wavelength double-view-field two-gear zooming infrared optical system, which comprises a front fixed group, a first zooming group, a second zooming group and a rear fixed group which are sequentially arranged from an object space to an image space; the front fixed group is a meniscus germanium single crystal positive lens with a convex surface facing an object space, and one side of the front fixed group facing an image space is an even-order aspheric surface; the first zoom group is a germanium single crystal negative lens with a biconcave surface; the second zoom group is a meniscus germanium single crystal positive lens with a convex surface facing the object space, one side of the meniscus germanium single crystal positive lens facing the image space is an even-order aspheric surface, and the aperture diaphragm is positioned on the surface of the second zoom group facing the image space and is kept constant in the zooming process; the rear fixed group is a meniscus germanium single crystal positive lens with a convex surface facing an object space. The simple airborne long-wave double-view-field two-level zoom infrared optical system has the advantages of short optical total length, small volume, convenience in carrying, simplicity in installation and adjustment, low cost and high image quality.
Description
Technical Field
The invention belongs to the technical field of electronic information, relates to infrared detection, and particularly relates to a 5-time wavelength double-view-field two-gear zooming infrared optical system.
Background
With the development of science and technology, infrared optical systems are widely applied to the military field. Commonly used infrared systems include continuous zoom optical systems and two-stage zoom optical systems. The two-gear zoom optical system has the advantages of simple structure, high transmissivity, small size and the like, can realize long-focus high-resolution imaging and wide-field search imaging, and is widely applied to photoelectric detection equipment. At present, the domestic airborne-based long-wave double-view-field two-gear zooming infrared optical system generally has the following disadvantages: the lens has a large number, expensive chalcogenide glass is generally used as a lens material, more than 3 even-order aspheric surfaces and 1 diffraction spherical surfaces are used as lens surface types, the two surface type lenses are expensive, particularly the diffraction spherical surfaces, the lens processing is complex, and the optical system installation and adjustment are complex, so that the development of a long-wave double-view-field two-grade zooming infrared optical system with few lenses, low cost and simple installation and adjustment is the future development direction.
Disclosure of Invention
The invention aims to provide a 5-time wavelength double-view-field two-gear zooming infrared optical system, which overcomes the defects in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the 5-time wavelength double-view-field two-gear zooming infrared optical system comprises a front fixed group, a first zooming group, a second zooming group and a rear fixed group which are sequentially arranged from an object space to an image space;
the front fixed group is a meniscus germanium single crystal positive lens with a convex surface facing an object space, and one side of the front fixed group facing an image space is an even-order aspheric surface; the first zoom group is a germanium single crystal negative lens with a biconcave surface; the second zoom group is a meniscus germanium single crystal positive lens with a convex surface facing the object space, one side of the meniscus germanium single crystal positive lens facing the image space is an even-order aspheric surface, and the aperture diaphragm is positioned on the surface of the second zoom group facing the image space and is kept constant in the zooming process; the rear fixed group is a meniscus germanium single crystal positive lens with a convex surface facing an object space.
Further, the displacement stroke of the first variable magnification group is 40.515 mm.
Further, the displacement stroke of the second variable magnification group is 16.546 mm.
Furthermore, the surface of the front fixed group facing the object space is plated with a diamond-like carbon film, and the surface of the front fixed group facing the image space and the two surfaces of the first variable-power group, the second variable-power group and the rear fixed group are plated with antireflection films.
Furthermore, the working wavelength of the antireflection film is 8-12 um.
Furthermore, a long-wave uncooled detector is arranged on one side, facing the image space, of the rear fixed group.
Furthermore, the resolution of the long-wave uncooled detector is 640 x 512, and the size of a pixel is 17 um.
Furthermore, the working wavelength of the 5-time wavelength double-view-field two-gear zooming infrared optical system is 8-12 um, the focal length is 15-75 mm, the optical F number is 1.2, the total optical length is 140mm, and the maximum aperture is 83 mm.
Compared with the prior art, the invention has the following beneficial technical effects:
the optical system of the invention has 5 times of zoom ratio, optical total length 140mm, compact structure, large zoom ratio, small lens quantity (4 pieces of germanium material), wherein only 2 surfaces are aspheric surfaces, expensive chalcogenide glass and the like are not used, and the lens is processed to be not low. Two lenses of the zoom group bring great convenience to installation and adjustment and structural design, the imaging quality of the system is high, the stability of an optical axis in the zooming process is ensured, and various airplane photoelectric pods are easy to assemble.
Drawings
FIG. 1 is a schematic view of an optical system of the present invention at a short focal length of 15 mm;
FIG. 2 is a schematic diagram of the present invention at a short focal length of 15 mm;
FIG. 3 is a graph of the MTF of the optical transfer function of the present invention at a short focal length of 15mm (cut-off resolution of 30 lp/mm);
FIG. 4 is a graph of the energy distribution of the optical system of the present invention at a short focal length of 15 mm;
FIG. 5 is a graph of field curvature and distortion for an optical system of the present invention at a short focal length of 15 mm;
FIG. 6 is a schematic view of an optical system of the present invention at a short focal length of 75 mm;
FIG. 7 is a chart of a timing diagram of the present invention at a short focal length of 75 mm;
FIG. 8 is a graph of the MTF of the optical transfer function at a short focal length of 75mm (cut-off resolution of 30lp/mm) according to the present invention;
FIG. 9 is a graph of the energy distribution of the optical system of the present invention at a short focal length of 75 mm;
FIG. 10 is a graph of field curvature and distortion for an optical system of the present invention at a short focal length of 75 mm.
Wherein, L1 is a front fixed group, L2 is a first variable-magnification group, L3 is a second variable-magnification group, L4 is a rear fixed group, and S1-S8 are surfaces of L1, L2, L3 and L4.
Detailed Description
The invention is further described below:
the simple airborne long-wave double-view-field two-gear zooming infrared optical system has the advantages of short optical total length, small volume, portability, simplicity in installation and adjustment, low cost and high image quality. The working wavelength is 8-12 um, the focal length is 15-75 mm, the optical F number is 1.2, the resolution ratio is 640 x 480, the uncooled long-wave infrared detector with the pixel size of 17um, the optical total length is 140mm, and the maximum aperture is 83 mm.
Specifically, the 5-fold wavelength double-view-field two-stage zooming infrared optical system comprises a front fixed group L1, a first zooming group L2, a second zooming group L3 and a rear fixed group L4 which are sequentially arranged from an object side to an image side; the front fixed group L1 has positive focal power, and the front fixed group L1 is a meniscus germanium single crystal positive lens with a convex surface facing the object space, and one side facing the image space is an even aspheric surface; the first variable power group L2 has negative focal power, and the first variable power group L2 is a piece of biconcave germanium single crystal negative lens; the second variable power group L3 has positive focal power, the second variable power group L3 is a meniscus germanium single crystal positive lens with a convex surface facing the object space, one side of the positive lens facing the image space is an even aspheric surface, and the aperture diaphragm is positioned on the surface of the second variable power group L3 facing the image space and is kept constant in the zooming process; the rear fixed group L4 has positive focal power, the rear fixed group L4 is a meniscus germanium single crystal positive lens with a convex surface facing an object space, the displacement stroke of the first variable-power group L2 is 40.515mm, the displacement stroke of the second variable-power group L3 is 16.546mm, the surface of the front fixed group L1 facing the object space is plated with a diamond-like carbon film, the surface of the front fixed group L1 facing the image space and the two surfaces of the first variable-power group L2, the second variable-power group L3 and the rear fixed group L4 are plated with antireflection films, the working wavelength of the antireflection films is 8-12 um, and one side of the rear fixed group L4 facing the image space is provided with a long-wave non-refrigeration detector.
The optical system lens of the invention satisfies the following parameters:
the two-gear zoom focal length of the lens of the optical system is 15-75 mm, the F number is 1.2, and the total length of the optical system is 140 mm; the field angle range is 34.123-2.566 degrees; the rear intercept of the optical system lens is 5.529 mm; the working wavelength of the optical system lens is 8-12 um; the full-field average transfer function value MTF of the optical system lens is greater than 0.39@30 lp/mm; the even-order aspheric lens in the optical system lens meets the following expression:
where c is the paraxial part curvature radius, k is the Conic coefficient, and the following an is the even aspheric coefficient, and among all the even aspheric use surface types, the coefficients of the retention 2-degree term are always defined as 0. The reason is that: the introduction of the 2-degree term brings about the variation of R and Conic design values, that is, the values of the focal length and Conic are changed in a complex way due to the introduction of the 2-degree term, and the final measurement also has problems.
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1 and 5, which are diagrams of the optical system in long focus and short focus, respectively, the structure of the lens is the same.
As shown in fig. 1, the present invention is composed of a front fixed group L1 of positive power, a first variable power group L2 and a second variable power group L3 of negative power and positive power, and a rear fixed group L4 of positive power.
The front fixed group L1 is a meniscus germanium single crystal positive lens with the convex surface facing the object, and the surface of the side S2 facing the image is an even aspheric surface.
The first variable power group L2 and the second variable power group L3 are a lens with negative focal power and a lens with positive focal power respectively, and specifically, the first variable power group L2 and the second variable power group L3 are a piece of biconcave germanium single crystal negative lens and a piece of meniscus germanium single crystal positive lens with the convex surface facing the object space respectively; the displacement stroke of the biconcave lens is 40.515 mm; the displacement stroke of the convex lens is 16.546 mm; the lens group is a movable lens, the purposes of zooming and focusing are achieved, and therefore the switching of a wide-narrow double-view field is achieved, wherein a meniscus germanium single crystal positive lens with a convex surface facing an object side is provided with an even aspheric surface on the surface facing the image side S6, an aperture diaphragm is positioned on the surface facing the image side of the second variable power group L3, and the aperture diaphragm is kept constant in the zooming process;
the rear fixed group L4 is a meniscus germanium single crystal positive lens with a convex surface facing the object space, the image is formed on the surface of the detector, the resolution of the detector is 640 x 512, and the pixel size is 17 um.
Among the four lenses, the S1 surface of the front fixed group lens facing the object space needs to be plated with a diamond-like carbon film to play a role in protection, and the other S2-S8 surfaces need to be plated with anti-reflection films with corresponding working wavelengths of 8-12 um.
Table 1 shows the optical structure parameters of the present invention in the case of two focal lengths:
TABLE 1 optical structure parameter table
The surfaces S2 and S6 of the above 4 lenses are even aspheric surfaces, and the expression is as follows:
where c is the paraxial radius of curvature, k is the Conic cone coefficient, and the following anAre even aspheric coefficients.
Table 2 coefficients in aspheric surface:
| surface of | a4 | a6 | a8 |
| S2 | -2.49E-008 | -9.936E-013 | 2.233E-15 |
| S6 | 4.623E-007 | 9.89E-011 | -2.383E-13 |
The present invention is described in detail below with reference to examples:
referring to fig. 2 to 5, the aberration analysis diagrams of the 5 × wavelength dual-field two-step zoom infrared optical system of fig. 1 in the short focal length 15mm state are shown, wherein fig. 2 is a point diagram; FIG. 3 is a graph of the optical transfer function MTF; FIG. 4 is a graph of energy distribution; fig. 5 is a graph of field curvature and distortion.
Fig. 7 to 10 are diagrams illustrating aberration analysis of the 5 × wavelength dual-field two-step zoom infrared optical system of fig. 6 in a state of 75mm short focal length, wherein fig. 7 is a point diagram; FIG. 8 is a graph of the optical transfer function MTF; FIG. 9 is a graph of energy distribution; fig. 10 is a graph of field curvature and distortion.
It can be seen from the figure that, at each focal length of the two-step zoom, various aberrations are well corrected, wherein the RMS size of the optical diffuse spot is close to that of the ehrlichia spot; meanwhile, the MTF of the optical transfer function is close to the diffraction limit, and the distortion is less than 9%; the energy is concentrated in one pixel of the detector, and the energy is more than 95%, so that the use requirement of the system is met.
In conclusion, the method can be seen; the 5-time wavelength double-view-field two-gear zooming infrared optical system has good imaging quality.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (8)
- The 1.5-time wavelength double-view-field two-gear zooming infrared optical system is characterized by comprising a front fixed group (L1), a first zoom group (L2), a second zoom group (L3) and a rear fixed group (L4) which are sequentially arranged from an object space to an image space;the front fixed group (L1) is a meniscus germanium single crystal positive lens with a convex surface facing the object space, and one side of the front fixed group facing the image space is an even aspheric surface; the first variable power group (L2) is a double-concave germanium single crystal negative lens; the second variable power group (L3) is a meniscus germanium single crystal positive lens with a convex surface facing to an object space, one side of the meniscus germanium single crystal positive lens facing to an image space is an even aspheric surface, and the aperture diaphragm is positioned on the surface of the second variable power group (L3) facing to the image space and is kept constant in the zooming process; the rear fixed group (L4) is a meniscus germanium single crystal positive lens with a convex surface facing the object space.
- 2. The 5 × wavelength dual field of view two-stage zoom infrared optical system according to claim 1, wherein a displacement stroke of the first magnification-varying group (L2) is 40.515 mm.
- 3. The 5 × wavelength dual field of view two-stage zoom infrared optical system according to claim 2, wherein a displacement stroke of the second variable power group (L3) is 16.546 mm.
- 4. The 5-fold wavelength double-field-of-view two-stage zoom infrared optical system according to claim 1, wherein a surface of the front fixed group (L1) facing an object side is coated with a diamond-like carbon film, and a surface of the front fixed group (L1) facing an image side and both surfaces of the first variable power group (L2), the second variable power group (L3) and the rear fixed group (L4) are coated with antireflection films.
- 5. The 5-wavelength double-field-of-view two-stage zoom infrared optical system according to claim 1, wherein the working wavelength of the antireflection film is 8-12 um.
- 6. The 5 × wavelength dual-field-of-view two-stage zoom infrared optical system according to claim 1, wherein a long-wave uncooled detector is disposed on an image side of the rear fixed group (L4).
- 7. The 5 × wavelength dual field of view two-stage zoom infrared optical system of claim 6, wherein the long wave uncooled detector has a resolution of 640 × 512 and a pixel size of 17 um.
- 8. The 5-wavelength double-view-field two-stage zooming infrared optical system according to claim 1, wherein the working wavelength of the 5-wavelength double-view-field two-stage zooming infrared optical system is 8-12 um, the focal length is 15-75 mm, the optical F number is 1.2, the total optical length is 140mm, and the maximum aperture is 83 mm.
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| CN202010038977.8A CN111090170A (en) | 2020-01-14 | 2020-01-14 | 5-fold wavelength double-view-field two-gear zooming infrared optical system |
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| CN202010038977.8A CN111090170A (en) | 2020-01-14 | 2020-01-14 | 5-fold wavelength double-view-field two-gear zooming infrared optical system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115202014A (en) * | 2022-06-02 | 2022-10-18 | 昆明物理研究所 | Compact uncooled long-wave infrared continuous zooming optical system |
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| JP2004361651A (en) * | 2003-06-04 | 2004-12-24 | Ricoh Co Ltd | Telecentric lens system and scanning optical system/image display device and image photographing device |
| JP2007264649A (en) * | 2007-05-15 | 2007-10-11 | Sumitomo Electric Ind Ltd | Infrared zoom lens and infrared camera |
| CN102193178A (en) * | 2010-03-05 | 2011-09-21 | 株式会社腾龙 | Infrared zooming lens |
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| CN207216126U (en) * | 2017-08-22 | 2018-04-10 | 北京蓝思泰克科技有限公司 | A kind of small size large aperture long wave double-view field infrared optical lens |
| CN207216124U (en) * | 2017-08-22 | 2018-04-10 | 三河市蓝思泰克光电科技有限公司 | A kind of light-duty LONG WAVE INFRARED double-view field camera lens of cut-in type |
| CN211236425U (en) * | 2020-01-14 | 2020-08-11 | 西安深瞳智控技术有限公司 | 5-fold wavelength double-view-field two-gear zooming infrared optical system |
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2020
- 2020-01-14 CN CN202010038977.8A patent/CN111090170A/en active Pending
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| JP2001051191A (en) * | 1999-08-10 | 2001-02-23 | Sumitomo Electric Ind Ltd | ftheta LENS |
| JP2004264685A (en) * | 2003-03-03 | 2004-09-24 | Mitsubishi Electric Corp | Variable power optical device |
| JP2004361651A (en) * | 2003-06-04 | 2004-12-24 | Ricoh Co Ltd | Telecentric lens system and scanning optical system/image display device and image photographing device |
| JP2007264649A (en) * | 2007-05-15 | 2007-10-11 | Sumitomo Electric Ind Ltd | Infrared zoom lens and infrared camera |
| CN102193178A (en) * | 2010-03-05 | 2011-09-21 | 株式会社腾龙 | Infrared zooming lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115202014A (en) * | 2022-06-02 | 2022-10-18 | 昆明物理研究所 | Compact uncooled long-wave infrared continuous zooming optical system |
| CN115202014B (en) * | 2022-06-02 | 2023-11-03 | 昆明物理研究所 | Compact uncooled long-wave infrared continuous zooming optical system |
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