CN105334602A - Long wave long-line scanning three-vision field infrared optical system - Google Patents
Long wave long-line scanning three-vision field infrared optical system Download PDFInfo
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- CN105334602A CN105334602A CN201510901261.5A CN201510901261A CN105334602A CN 105334602 A CN105334602 A CN 105334602A CN 201510901261 A CN201510901261 A CN 201510901261A CN 105334602 A CN105334602 A CN 105334602A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 127
- 238000003384 imaging method Methods 0.000 claims abstract description 26
- 230000004075 alteration Effects 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 8
- 238000013461 design Methods 0.000 claims description 6
- PFNQVRZLDWYSCW-UHFFFAOYSA-N (fluoren-9-ylideneamino) n-naphthalen-1-ylcarbamate Chemical compound C12=CC=CC=C2C2=CC=CC=C2C1=NOC(=O)NC1=CC=CC2=CC=CC=C12 PFNQVRZLDWYSCW-UHFFFAOYSA-N 0.000 claims description 5
- 229910052732 germanium Inorganic materials 0.000 claims description 5
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 5
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 230000000007 visual effect Effects 0.000 abstract description 17
- 238000011160 research Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 229910000661 Mercury cadmium telluride Inorganic materials 0.000 description 1
- 206010073261 Ovarian theca cell tumour Diseases 0.000 description 1
- 201000009310 astigmatism Diseases 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003331 infrared imaging Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 208000001644 thecoma Diseases 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
- G02B15/02—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective
- G02B15/04—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective by changing a part
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Abstract
The invention relates to a long wave long-line scanning three-vision field infrared optical system, which comprises a telescopic objective group, a converge imaging group and a detector which are orderly arranged from an object space to an image space on a same optical axis, wherein the telescopic objective group comprises a front fixed lens, a zooming group and a rear fixed lens, and the zooming group comprises a big visual field zooming group and a middle visual field zooming group. When the big visual field zooming group is projected into an optical system and the middle visual field zooming group is cut out from the optical system, and the optical system is a big visual field optical system. When the middle visual field zooming group is projected into the optical system and the big visual field zooming group is cut out from the optical system, the optical system is a middle visual filed optical system. When the big visual field zooming group and the middle visual field zooming group are cut out from the optical system, the optical system is a small visual field optical system. The long wave long-line scanning three-vision field infrared optical system can achieve switching and scan imaging between big, middle and small visual fields by projecting and cutting out corresponding zooming groups, and achieves arbitrary switching of the big, the middle and the small visual fields.
Description
Technical Field
The invention relates to a long wavelength line array scanning three-field infrared optical system.
Background
The infrared imaging system has the excellent characteristics of passive working mode, no electronic interference, good concealment, visual image, high precision, good detection performance and the like, and is widely applied to an onboard photoelectric radar, a reconnaissance/aiming pod and a distributed infrared system. In other military fields, such as combat vehicles, ships, individual soldiers and the like, novel infrared technical equipment is assembled; the products comprise a civil aircraft infrared vision enhancement system, a passenger aircraft anti-terrorist attack infrared threat alarm system, a forest fire prevention infrared detection system and the like, and have wide application markets in the aspects of civil aviation. With the long-term development of infrared optical technology and the continuous expansion of the application range thereof, the requirements on multi-view field and wide-view field imaging of an infrared optical system are increasingly enhanced, and the research on how to enable high-resolution multi-view field remote imaging and panoramic imaging of the infrared optical system has very important significance on the research on military infrared optical instruments. But there are few prior art optical systems for high resolution multi-field long range imaging.
Disclosure of Invention
The invention aims to provide a long wavelength line array scanning three-field-of-view infrared optical system.
In order to achieve the above object, the present invention comprises a long wavelength linear scanning three-view-field infrared optical system, comprising a telescopic objective lens group, a convergent imaging group and a detector, which are sequentially arranged from an object side to an image side along an optical axis, wherein the telescopic objective lens group comprises a front fixed lens, a zoom group and a rear fixed lens group, wherein the zoom group comprises a large-view-field zoom group and a medium-view-field zoom group, the large-view-field zoom group comprises a second lens and a fifth lens, the medium-view-field zoom group comprises a third lens and a fourth lens, and the second lens, the third lens, the fourth lens and the fifth lens are sequentially arranged from the object side to the image side; when the large-view-field variable-magnification group is put into the optical system and the middle-view-field variable-magnification group is cut out from the optical system, the optical system is a large-view-field optical system; the middle view field variable-magnification group is put into the optical system, and the large view field variable-magnification group is cut out of the optical system, wherein the optical system is a middle view field optical system; when the large-view-field variable-power group and the middle-view-field variable-power group are cut out of the optical system, the optical system is a small-view-field optical system;
the design indexes of the optical system are as follows: the wavelength is 7.7-10.3 μm; the pixel size is as follows: 20 μm × 24 μm; f # is 2; when the focal length is 500mm, the field angle is 2.82 ° × 2.11 °; a field angle of 4.69 ° × 3.52 ° when the focal length is 300 mm; when the focal length is 100mm, the angle of view is 14.04 ° × 10.53 °.
The total optical power of the optical system satisfies the following formula:
wherein,is the power of the i-th lens, hiThe height of incidence of paraxial rays on the ith lens,is the total optical power of the system;
the total chromatic aberration coefficient of the optical system satisfies the following formula:
wherein: ciIs the chromatic aberration coefficient of the i-th lens, CtotalIs the total chromatic aberration coefficient of the optical system.
The front fixed lens is a first lens, the rear fixed lens group comprises a sixth lens, a seventh lens, an eighth lens and a ninth lens which are sequentially arranged along the same optical axis, the convergence imaging group comprises a tenth lens, an eleventh lens, a twelfth lens and a thirteenth lens which are sequentially arranged along the same optical axis, the first lens is a positive focal power lens, the second lens is a negative focal power lens, the third lens is a negative focal power lens, the fourth lens is a positive focal power lens, the fifth lens is a positive focal power lens, the sixth lens is a negative focal power lens, the seventh lens is a negative focal power lens, the eighth lens is a negative focal power lens, the ninth lens is a positive focal power lens, the tenth lens is a positive focal power lens, the eleventh lens is a negative focal power lens, the twelfth lens is a positive focal power lens, and the thirteenth lens is a positive focal power lens.
A first reflector is arranged between the sixth lens and the seventh lens, and light rays emitted by the sixth lens are reflected by the first reflector and then are emitted into the seventh lens; and a second reflector is arranged between the rear fixed mirror group and the convergent imaging group, and light rays emitted by the rear fixed mirror group are reflected by the second reflector and then enter the convergent imaging group.
The surface of the second lens, which is close to the image side, is an aspheric surface, the surface of the fifth lens, which is close to the image side, is an aspheric surface, two surfaces of the seventh lens are aspheric surfaces, two surfaces of the ninth lens are aspheric surfaces, the surface of the tenth lens, which is close to the object side, is an aspheric surface, the surface of the eleventh lens, which is close to the image side, is an aspheric surface, and the surface of the thirteenth lens, which is close to the object side, is an aspheric surface.
The material of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the seventh lens, the ninth lens, the tenth lens, the eleventh lens, the twelfth lens and the thirteenth lens is germanium, and the material of the sixth lens and the eighth lens is zinc selenide.
The optical system is arranged in a lens barrel, and the lens barrel is made of aluminum alloy.
The optical system uses the cold light diaphragm of the detector as the aperture diaphragm of the optical system.
The optical system provided by the invention can realize switching scanning imaging among a large view field, a middle view field and a small view field by switching in and out the corresponding zoom lenses, can realize random switching of three view fields, and can also be applied to panoramic imaging. The whole optical system keeps a transfer function more than 0.4 in an ultra-wide temperature range of minus 40 ℃ to plus 60 ℃. The optical system has higher resolution ratio, can realize remote imaging, and has very important significance for the research of military infrared optical instruments.
Drawings
Fig. 1 is a schematic structural diagram of a long wavelength line scanning three-field infrared optical system.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The long wavelength line scanning three-view field infrared optical system provided by the invention is integrally divided into three parts, namely a telescopic objective lens group, a convergent imaging group and a detector which are sequentially arranged from an object space to an image space along the same optical axis. The telescopic objective lens group comprises a front fixed lens, a zoom group and a rear fixed lens group, and the zoom group consists of a large-view-field zoom group and a medium-view-field zoom group. As shown in fig. 1, the large-field variable power group is composed of a lens 2 and a lens 5, the medium-field variable power group is composed of a lens 3 and a lens 4, and the lens 2, the lens 3, the lens 4 and the lens 5 are arranged in the following order: from the object side to the image side, there are lens 2, lens 3, lens 4 and lens 5.
The optical system achieves three fields of view by switching in and out corresponding variable power groups: switching among the large visual field, the medium visual field and the small visual field specifically comprises the following steps: when the large-field variable-power group is put into the optical system and the middle-field variable-power group is cut out from the optical system, namely, light generated by an object passes through the lens 2 and the lens 5 and is transmitted to a subsequent rear fixed mirror group and is converged into an image group until reaching a detector, the lens 3 and the lens 4 do not contribute to the imaging of the optical system, namely, the lens 3 and the lens 4 are excluded from the optical system, and then the optical system is a large-field optical system; similarly, the medium-field variable magnification group is put into the optical system, and the large-field variable magnification group is cut out from the optical system, which is the medium-field optical system. In addition, when the large-field variable power group and the medium-field variable power group are each cut out from the optical system, that is, the lens 2, the lens 3, the lens 4, and the lens 5 are all excluded from the optical system, the optical system is a small-field optical system. The switching of three fields of view can be realized by switching in and out the optical system through the two variable power groups.
There are two conventional methods for putting in and cutting out a lens group: the motor or the manual work is used for inputting and cutting, and when the motor is used for operation, the motor drives the lens group to move to realize inputting and cutting, for example: the motor is used for rotatably putting the lens group into or cutting the lens group out of the system, and the motor drives the lens group to move belongs to the conventional technology, so that the details are not repeated; when the operation is carried out manually, the lens group is manually input and cut out from the system according to the requirement.
The design indexes of the optical system are as follows: the wavelength is 7.7-10.3 μm; the pixel size is as follows: 20 μm × 24 μm; f # is 2; when the focal length is 500mm, the field angle is 2.82 ° × 2.11 °; a field angle of 4.69 ° × 3.52 ° when the focal length is 300 mm; when the focal length is 100mm, the angle of view is 14.04 ° × 10.53 °. In addition, in order to match the optical system, the detector is a 1024 × 6TDI HgCdTe linear array.
The power distribution of the individual lenses in the optical system needs to meet the requirement of total power, which satisfies the following formula:
wherein,is the power of the i-th lens, hiThe height of incidence of paraxial rays on the ith lens,is the total optical power of the system.
The total chromatic aberration coefficient of the optical system also needs to satisfy the following formula:
wherein: ciIs the chromatic aberration coefficient of the i-th lens, CtotalIs the total chromatic aberration coefficient of the optical system.
The focal power distribution condition of the system can be obtained by solving the equation, and the CODEC software is used for further optimizing the design. According to the principle of successive approximation, under the conditions of controlling chromatic aberration and thermal image constraint, the optimization variables of all the lenses are released, the aspheric surface is introduced, the intermediate structure is repeatedly analyzed and optimized, and the satisfactory optical system meeting the design index and performance requirements is directly obtained.
The present embodiment gives a specific structure of the optical system under the conditions satisfying the above-described respective conditions. As shown in fig. 1, the front fixed lens is lens 1, the rear fixed lens group includes lens 6, lens 8, lens 9 and lens 10 which are arranged in sequence along the optical axis, and the convergent imaging group includes lens 12, lens 13, lens 14 and lens 15 which are arranged in sequence along the optical axis. Wherein, lens 1 is a positive focal power lens, lens 2 is a negative focal power lens, lens 3 is a negative focal power lens, lens 4 is a positive focal power lens, lens 5 is a positive focal power lens, lens 6 is a negative focal power lens, lens 8 is a negative focal power lens, lens 9 is a negative focal power lens, lens 10 is a positive focal power lens, lens 12 is a positive focal power lens, lens 13 is a negative focal power lens, lens 14 is a positive focal power lens, and lens 15 is a positive focal power lens.
The surface close to the image side in the lens 2 is an aspherical surface, the surface close to the image side in the lens 5 is an aspherical surface, both surfaces in the lens 8 are aspherical surfaces, both surfaces in the lens 10 are aspherical surfaces, the surface close to the object side in the lens 12 is an aspherical surface, the surface close to the image side in the lens 13 is an aspherical surface, and the surface close to the object side in the lens 15 is an aspherical surface.
The material of lens 1, lens 2, lens 3, lens 4, lens 5, lens 8, lens 10, lens 12, lens 13, lens 14 and lens 15 is germanium, and the material of lens 6 and lens 9 is zinc selenide. Moreover, the optical system can be arranged in a lens barrel, and the lens barrel is made of aluminum alloy, so that the optical system is light in weight and convenient to mount and carry.
The optical system takes a cold light diaphragm of a detector as an aperture diaphragm of the optical system, takes a cold light diaphragm as the aperture diaphragm of the optical system, has the cold light diaphragm efficiency of 100 percent, and can realize no interference of stray light outside the system.
In addition, in order to shorten the whole axial length of the optical system, a reflecting mirror 7 is arranged between the lens 6 and the lens 8, and light rays emitted by the lens 6 are reflected by the reflecting mirror 7 and then enter the lens 8; a reflector 11 is arranged between the rear fixed mirror group and the convergent imaging group, and light rays emitted by the lens 10 in the rear fixed mirror group are reflected by the reflector 11 and then enter the lens 12 in the convergent imaging group.
Table 1 shows parameters of each component of the optical system in a small field of view, table 2 shows parameters of lens 2 and lens 5, and table 3 shows parameters of lens 3 and lens 4, wherein the contents of table 1 plus the contents of table 2 show parameters of each component of the optical system in a medium field of view; the contents of table 1 plus the contents of table 3 constitute the parameters of the various components of the optical system over a large field of view.
TABLE 1
TABLE 2
TABLE 3
The optical system utilizes the aspheric lens, so that the degree of freedom in the design process of the optical system can be increased, the coma, spherical aberration and astigmatism of the correction system can be coordinated, and the image quality can be greatly improved. Moreover, the optical system can realize three-field switching scanning imaging and can be applied to panoramic imaging. The optical system uses two infrared optical materials: germanium is matched with zinc selenide, only germanium and zinc selenide are used for matching materials of the passive athermal optical system, so that three fields of view of the optical system keep high-quality imaging within the temperature range of-40 ℃ to +60 ℃, and the transfer function keeps more than 0.4. In addition, the optical system can be applied to line-row swing scanning imaging and can also be applied to scanning working modes such as circumferential scanning and the like.
The specific embodiments are given above, but the present invention is not limited to the described embodiments. The basic idea of the present invention lies in the above basic scheme, and it is obvious to those skilled in the art that no creative effort is needed to design various modified models, formulas and parameters according to the teaching of the present invention. Variations, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the invention, and still fall within the scope of the invention.
Claims (8)
1. The long wavelength line scanning three-view field infrared optical system is characterized by comprising a telescopic objective group, a convergence imaging group and a detector which are sequentially arranged from an object space to an image space along the same optical axis, wherein the telescopic objective group comprises a front fixed lens, a zoom group and a rear fixed lens group, the zoom group consists of a large-view field zoom group and a medium-view field zoom group, the large-view field zoom group consists of a second lens and a fifth lens, the medium-view field zoom group consists of a third lens and a fourth lens, and the second lens, the third lens, the fourth lens and the fifth lens are sequentially arranged from the object space to the image space; when the large-view-field variable-magnification group is put into the optical system and the middle-view-field variable-magnification group is cut out from the optical system, the optical system is a large-view-field optical system; the middle view field variable-magnification group is put into the optical system, and the large view field variable-magnification group is cut out of the optical system, wherein the optical system is a middle view field optical system; when the large-view-field variable-power group and the middle-view-field variable-power group are cut out of the optical system, the optical system is a small-view-field optical system;
the design indexes of the optical system are as follows: the wavelength is 7.7-10.3 μm; the pixel size is as follows: 20 μm × 24 μm; f # is 2; when the focal length is 500mm, the field angle is 2.82 ° × 2.11 °; a field angle of 4.69 ° × 3.52 ° when the focal length is 300 mm; when the focal length is 100mm, the angle of view is 14.04 ° × 10.53 °.
2. The long wavelength linescan three field-of-view infrared optical system of claim 1, wherein the total optical power of the optical system satisfies the following formula:
wherein,is the power of the i-th lens, hiThe height of incidence of paraxial rays on the ith lens,is the total optical power of the system;
the total chromatic aberration coefficient of the optical system satisfies the following formula:
wherein: ciIs the chromatic aberration coefficient of the i-th lens, CtotalIs the total chromatic aberration coefficient of the optical system.
3. The long wavelength linescan triple field infrared optical system of claim 2, wherein the front fixed lens is a first lens, the rear fixed lens group comprises a sixth lens, a seventh lens, an eighth lens and a ninth lens arranged in sequence with the optical axis, the convergent imaging group comprises a tenth lens, an eleventh lens, a twelfth lens and a thirteenth lens arranged in sequence with the optical axis, the first lens is a positive power lens, the second lens is a negative power lens, the third lens is a negative power lens, the fourth lens is a positive power lens, the fifth lens is a positive power lens, the sixth lens is a negative power lens, the seventh lens is a negative power lens, the eighth lens is a negative power lens, the ninth lens is a positive power lens, the tenth lens is a positive power lens, the eleventh lens is a power lens, the twelfth lens is a positive focal power lens, and the thirteenth lens is a positive focal power lens.
4. The long wavelength line scanning three-field of view infrared optical system of claim 3, wherein a first mirror is disposed between the sixth lens and the seventh lens, and the light emitted from the sixth lens is reflected by the first mirror and then enters the seventh lens; and a second reflector is arranged between the rear fixed mirror group and the convergent imaging group, and light rays emitted by the rear fixed mirror group are reflected by the second reflector and then enter the convergent imaging group.
5. The long wavelength linescan three-field infrared optical system of claim 3, wherein a surface of the second lens near the image side is aspheric, a surface of the fifth lens near the image side is aspheric, both surfaces of the seventh lens are aspheric, both surfaces of the ninth lens are aspheric, a surface of the tenth lens near the object side is aspheric, a surface of the eleventh lens near the image side is aspheric, and a surface of the thirteenth lens near the object side is aspheric.
6. The long wavelength linescan three field of view infrared optical system of claim 3, wherein the material of the first, second, third, fourth, fifth, seventh, ninth, tenth, eleventh, twelfth and thirteenth lenses is germanium and the material of the sixth and eighth lenses is zinc selenide.
7. The long wavelength linescan three-field infrared optical system of claim 1, wherein the optical system is disposed in a lens barrel made of aluminum alloy.
8. The long wavelength line scanning three-field infrared optical system of claim 1, wherein the optical system uses a cold light stop of a detector as an aperture stop of the optical system.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443993A (en) * | 2016-11-28 | 2017-02-22 | 中国航空工业集团公司洛阳电光设备研究所 | Compact dual-path three-field long-wave infrared system |
| CN108121051A (en) * | 2016-11-30 | 2018-06-05 | 北京航天计量测试技术研究所 | One kind disappears veiling glare without thermalization double-view field switching infrared optical system |
| CN110780429A (en) * | 2019-10-21 | 2020-02-11 | 中国航空工业集团公司洛阳电光设备研究所 | double-L rotary three-view-field long-wave infrared system |
| CN113281887A (en) * | 2021-07-20 | 2021-08-20 | 西安微普光电技术有限公司 | Searching and tracking integrated infrared zoom lens and imaging method |
| CN115980986A (en) * | 2022-12-12 | 2023-04-18 | 之江实验室 | Zoom optical system, control method and control device thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106443993A (en) * | 2016-11-28 | 2017-02-22 | 中国航空工业集团公司洛阳电光设备研究所 | Compact dual-path three-field long-wave infrared system |
| CN106443993B (en) * | 2016-11-28 | 2019-06-21 | 中国航空工业集团公司洛阳电光设备研究所 | A kind of three visual field LONG WAVE INFRARED system of compact double light path |
| CN108121051A (en) * | 2016-11-30 | 2018-06-05 | 北京航天计量测试技术研究所 | One kind disappears veiling glare without thermalization double-view field switching infrared optical system |
| CN110780429A (en) * | 2019-10-21 | 2020-02-11 | 中国航空工业集团公司洛阳电光设备研究所 | double-L rotary three-view-field long-wave infrared system |
| CN110780429B (en) * | 2019-10-21 | 2021-10-22 | 中国航空工业集团公司洛阳电光设备研究所 | double-L rotary three-view-field long-wave infrared system |
| CN113281887A (en) * | 2021-07-20 | 2021-08-20 | 西安微普光电技术有限公司 | Searching and tracking integrated infrared zoom lens and imaging method |
| CN115980986A (en) * | 2022-12-12 | 2023-04-18 | 之江实验室 | Zoom optical system, control method and control device thereof |
| CN115980986B (en) * | 2022-12-12 | 2024-03-22 | 之江实验室 | A zoom optical system, a control method and a control device of the zoom optical system |
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| CN105334602B (en) | 2018-01-09 |
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