CN114355584B - Infrared medium-long wave double-band refrigeration lens without thermal difference - Google Patents
Infrared medium-long wave double-band refrigeration lens without thermal difference Download PDFInfo
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- CN114355584B CN114355584B CN202111666466.1A CN202111666466A CN114355584B CN 114355584 B CN114355584 B CN 114355584B CN 202111666466 A CN202111666466 A CN 202111666466A CN 114355584 B CN114355584 B CN 114355584B
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- Prior art keywords
- lens
- refrigeration
- object side
- band
- convex surface
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- 238000005057 refrigeration Methods 0.000 title claims abstract description 28
- 230000005499 meniscus Effects 0.000 claims abstract description 20
- 230000003287 optical effect Effects 0.000 claims abstract description 12
- 238000001228 spectrum Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 description 6
- 239000013078 crystal Substances 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 229910052732 germanium Inorganic materials 0.000 description 2
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 2
- 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 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000005083 Zinc sulfide Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052984 zinc sulfide Inorganic materials 0.000 description 1
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 description 1
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
- G02B13/146—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation with corrections for use in multiple wavelength bands, such as infrared and visible light, e.g. FLIR systems
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/02—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of crystals, e.g. rock-salt, semi-conductors
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Lenses (AREA)
Abstract
The invention relates to an infrared medium-length wave dual-band athermal refrigeration lens, which sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side to an image side along an optical axis, wherein the first lens is a meniscus negative diopter lens, and the convex surface faces the object side; the second lens is a meniscus positive diopter lens, and the convex surface faces to the object side; the third lens is a meniscus negative diopter lens, and the convex surface faces the object side; the fourth lens is a meniscus positive diopter lens, and the convex surface faces to the object side; the fifth lens is a meniscus positive diopter lens, the convex surface faces to the object side, the lens is simple in structure and high in resolution, the mid-wavelength infrared confocal is achieved, and the high-temperature low-temperature heat difference is corrected.
Description
Technical Field
The invention relates to an infrared medium-wavelength dual-band refrigeration lens without thermal difference.
Background
In the immature period of the dual-band detector technology, the dual-band thermal imager mainly adopts two single-band detectors and is matched with two separated optical systems or a beam splitting optical lens form, and the volume weight is large. The acquired imaging scenes cannot be completely consistent, so that image registration and then image fusion are required, more complex image processing is required, and scenery ghosts often exist due to image mismatch. With the development of technology progress, the imaging technology of the dual-band single detector is developed, and the localization is mature, and only a single optical system is needed, so that the imaging system has smaller volume, lower cost and higher stability.
Disclosure of Invention
In view of the defects of the prior art, the technical problem to be solved by the invention is to provide the infrared medium-long wave double-band thermal difference-free refrigeration lens which is simple and compact in structure and has the characteristics of high resolution and good stability.
In order to solve the technical problems, the technical scheme of the invention is as follows: the infrared medium-long wave dual-band refrigeration lens without thermal difference comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens in sequence from an object side to an image side along an optical axis, wherein the first lens is a meniscus type negative diopter lens, and the convex surface faces to the object side; the second lens is a meniscus positive diopter lens, and the convex surface faces to the object side; the third lens is a meniscus negative diopter lens, and the convex surface faces the object side; the fourth lens is a meniscus positive diopter lens, and the convex surface faces to the object side; the fifth lens is a meniscus positive diopter lens, and the convex surface faces the object side.
Further, the lens assembly comprises a diaphragm, wherein the diaphragm is arranged between the fifth lens and the image side, and two windows are arranged between the fifth lens and the diaphragm at intervals.
Further, the second lens satisfies the following condition: f2/f <1, wherein f2 is the effective focal length of the second lens, and f is the effective focal length of the infrared refrigerating lens.
Further, the fifth lens and the infrared refrigerating lens meet the following conditions: 2< - > f5/f <3 >, wherein f5 is the effective focal length of the fifth lens element and f is the effective focal length of the infrared lens element.
Further, the applicable spectrum range of the infrared medium-length wave dual-band heat-difference-free refrigeration lens is as follows: 3.7 μm to 4.8 μm and 7.7 μm to 9.5 μm.
Furthermore, the infrared medium-wavelength dual-band athermal design of the athermal refrigeration lens is provided.
Further, the first lens material is multispectral zinc sulfide.
Further, the second lens material is a silicon single crystal.
Further, the third lens material is germanium single crystal.
Further, the fourth lens material is CVD zinc selenide.
Further, the fifth lens material is germanium single crystal.
Furthermore, the lens surface of the infrared medium-wavelength dual-band heat-difference-free refrigeration lens is spherical and aspherical.
Compared with the prior art, the invention has the following beneficial effects: the infrared medium-long wave dual-band athermal refrigeration lens corrects various aberrations of each wave band, so that the central and edge view fields have enough resolution, and the lens has a simple structure and high resolution, realizes medium-wavelength infrared confocal, and corrects high-temperature thermal aberration.
The invention will be described in further detail with reference to the drawings and the detailed description.
Drawings
FIG. 1 is a schematic view of an optical structure according to an embodiment of the present invention;
FIG. 2 is a schematic view of MTF curve of a lens at 20deg.C in an embodiment of the present invention;
FIG. 3 is a schematic view of the MTF curve of a lens at-40℃in an embodiment of the present invention;
FIG. 4 is a schematic view of MTF curve of a lens at 70deg.C in an embodiment of the present invention;
FIG. 5 is a diagram of MTF vs. Field for a lens in an embodiment of the present invention.
In the figure: g1-first lens, G2-second lens, G3-third lens, G4-fourth lens and G5-fifth lens.
Detailed Description
In order to make the above features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1 to 5, an infrared medium-long wavelength dual-band refrigeration lens without thermal difference sequentially comprises a first lens G1, a second lens G2, a third lens G3, a fourth lens G4 and a fifth lens G5 along an optical axis from an object side to an image side, wherein the first lens is a meniscus negative diopter lens, and a convex surface faces to the object side; the second lens is a meniscus positive diopter lens, and the convex surface faces to the object side; the third lens is a meniscus negative diopter lens, and the convex surface faces the object side; the fourth lens is a meniscus positive diopter lens, and the convex surface faces to the object side; the fifth lens is a meniscus positive diopter lens, and the convex surface faces the object side.
In the embodiment of the invention, the lenses used for the infrared medium-long wave double-band refrigeration lens without heat difference are all made of domestic optical materials.
In the embodiment of the invention, the lens surface of the infrared medium-long wave double-band heat difference-free refrigeration lens is spherical and aspherical.
In the embodiment of the invention, the surface shape of the aspheric surface of the infrared medium-long wave double-band heat-difference-free refrigeration lens meets the following equation:
wherein z represents the distance of the curved surface from the curved surface vertex in the optical axis direction, c represents the curvature of the curved surface vertex, k represents the quadric surface coefficient, h represents the distance from the optical axis to the curved surface, B, C, D, E and F represent the fourth, sixth, eighth, tenth and twelfth order surface coefficients, respectively.
In the embodiment of the present invention, the relevant parameters of each lens are shown in table 1.
TABLE 1
In the embodiment of the present invention, the parameters of the aspherical surfaces of the lenses are shown in table 2.
TABLE 2
In the embodiment of the invention, the technical indexes realized by the invention are as follows:
1. focal length: 100mm;
2.F/#：2.0；
3. the detector comprises: 320X256;
4. pixel size: 30 μm;
5. the applicable spectrum range is as follows: 3.7-4.8 μm 7.7-9.5 μm;
6. total optical length: 122mm.
The invention is not limited to the best mode, and any person can obtain other various forms of infrared medium-long wave double-band non-heat-difference refrigeration lenses under the teaching of the invention. All equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the present invention.
Claims (5)
1. An infrared medium-long wave dual-band refrigeration lens without thermal difference is characterized in that: the refrigerating lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side to an image side along an optical axis, wherein the first lens is a meniscus negative diopter lens, and the convex surface faces to the object side; the second lens is a meniscus positive diopter lens, and the convex surface faces to the object side; the third lens is a meniscus negative diopter lens, and the convex surface faces the object side; the fourth lens is a meniscus positive diopter lens, and the convex surface faces to the object side; the fifth lens is a meniscus positive diopter lens, and the convex surface faces to the object side;
the second lens satisfies the following condition: f2/f <1, wherein f2 is the effective focal length of the second lens, and f is the effective focal length of the refrigeration lens;
the fifth lens and the refrigeration lens meet the following conditions: 2< f5/f <3 >, wherein f5 is the effective focal length of the fifth lens element and f is the effective focal length of the refrigerating lens element.
2. The infrared medium-length wave band dual-band heat-difference-free refrigeration lens according to claim 1, wherein the refrigeration lens is characterized in that: the lens assembly comprises a diaphragm, wherein the diaphragm is arranged between the fifth lens and the image side.
3. The infrared medium-length wave band dual-band heat-difference-free refrigeration lens according to claim 2, wherein the refrigeration lens is characterized in that: two windows are arranged between the fifth lens and the diaphragm at intervals.
4. The infrared medium-length wave band dual-band heat-difference-free refrigeration lens according to claim 1, wherein the refrigeration lens is characterized in that: the applicable spectrum range of the infrared medium-long wave double-band heat difference-free refrigeration lens is as follows: 3.7 μm to 4.8 μm and 7.7 μm to 9.5 μm.
5. The infrared medium-length wave band dual-band heat-difference-free refrigeration lens according to claim 1, wherein the refrigeration lens is characterized in that: the infrared medium-wavelength dual-band athermal design for the athermal refrigeration lens is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111666466.1A CN114355584B (en) | 2021-12-31 | 2021-12-31 | Infrared medium-long wave double-band refrigeration lens without thermal difference |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111666466.1A CN114355584B (en) | 2021-12-31 | 2021-12-31 | Infrared medium-long wave double-band refrigeration lens without thermal difference |
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| Publication Number | Publication Date |
|---|---|
| CN114355584A CN114355584A (en) | 2022-04-15 |
| CN114355584B true CN114355584B (en) | 2023-07-28 |
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| CN202111666466.1A Active CN114355584B (en) | 2021-12-31 | 2021-12-31 | Infrared medium-long wave double-band refrigeration lens without thermal difference |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116047714B (en) * | 2022-12-25 | 2024-03-15 | 福建福光股份有限公司 | Laser infrared common-aperture dual-mode optical system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4435341B2 (en) * | 1999-09-13 | 2010-03-17 | 日東光学株式会社 | Infrared lens |
| JP2002196233A (en) * | 2000-12-26 | 2002-07-12 | Nikon Corp | Infrared optical system and infrared optical device provided with the same |
| CN103744167A (en) * | 2013-12-20 | 2014-04-23 | 河北汉光重工有限责任公司 | Temperature-adaptive dual-view field refrigerating infrared optical system |
| CN205539680U (en) * | 2015-11-30 | 2016-08-31 | 三河市蓝思泰克光电科技有限公司 | Long -focus long wave infrared continuous zoom lens |
| RU2621366C1 (en) * | 2016-01-29 | 2017-06-02 | Публичное акционерное общество "Красногорский завод им. С.А. Зверева" | Compact lens of mid-infrared range |
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