CN112629669B - Optical athermal infrared lens with two wave bands, common caliber and large target surface and optical system - Google Patents
Optical athermal infrared lens with two wave bands, common caliber and large target surface and optical system Download PDFInfo
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- CN112629669B CN112629669B CN202011553084.3A CN202011553084A CN112629669B CN 112629669 B CN112629669 B CN 112629669B CN 202011553084 A CN202011553084 A CN 202011553084A CN 112629669 B CN112629669 B CN 112629669B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 137
- 238000005057 refrigeration Methods 0.000 claims abstract description 19
- 238000003384 imaging method Methods 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims description 17
- 150000004770 chalcogenides Chemical class 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 9
- 229910052732 germanium Inorganic materials 0.000 claims description 9
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 9
- 230000007246 mechanism Effects 0.000 claims description 7
- 239000005083 Zinc sulfide Substances 0.000 claims description 6
- 229910052984 zinc sulfide Inorganic materials 0.000 claims description 6
- DRDVZXDWVBGGMH-UHFFFAOYSA-N zinc;sulfide Chemical compound [S-2].[Zn+2] DRDVZXDWVBGGMH-UHFFFAOYSA-N 0.000 claims description 6
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 239000013078 crystal Substances 0.000 claims description 3
- 239000005357 flat glass Substances 0.000 claims description 3
- 230000009977 dual effect Effects 0.000 claims 1
- 238000013461 design Methods 0.000 abstract description 4
- 238000012546 transfer Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000010354 integration Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- 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
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- 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
- G01J5/0803—Arrangements for time-dependent attenuation of radiation signals
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- 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
- G01J5/0806—Focusing or collimating elements, e.g. lenses or concave mirrors
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- 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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/008—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
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- 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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- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/026—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using retaining rings or springs
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- 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
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Abstract
The invention relates to an optical lens, in particular to a two-waveband common-caliber large-target-surface optical athermalization infrared lens and an optical system. The invention aims to solve the technical problems of complex structure, high precision requirement, large volume and weight and small field angle of the conventional dual-band common-caliber optical athermalization infrared lens and provides a dual-band common-caliber large-target-surface optical athermalization infrared lens and an optical system. The dual-waveband common-aperture infrared detector has the advantages that the refraction type light path is adopted to achieve dual-waveband common-aperture design, the outer diameter of an optical element is effectively compressed through a secondary imaging system, the double-color refrigeration detector is selected, miniaturization and light weight of the optical system are achieved, imaging stability is good, quality is high, the problem that the existing dual-waveband common-aperture infrared lens is large in size and weight is solved, and a large target surface can provide a larger field angle.
Description
Technical Field
The invention relates to an optical lens, in particular to a two-waveband common-caliber large-target-surface optical athermalization infrared lens and an optical system.
Background
With the development of infrared optics, various fields put higher requirements on thermal infrared imagers, and refrigeration thermal imagers are gradually and widely used due to their higher response sensitivity. The dual-waveband common-caliber infrared lens can clearly image medium-wave and long-wave wavebands at the same time to obtain characteristic information of a target, and the use requirements in the fields of remote measurement and the like are gradually increased. At present, aiming at the double-waveband common-caliber optical athermalization infrared lens, most of the double-waveband common-caliber optical athermalization infrared lens adopts a folding/reflecting system to realize double optical paths common caliber, and the problems of the optical system are as follows: the structure is complicated, the precision requirement is high, the volume and the weight are large, and the field angle is small.
Disclosure of Invention
The invention aims to solve the technical problems of complex structure, high precision requirement, large volume and weight and small field angle of the conventional dual-band common-caliber optical athermalized infrared optical system and provides a dual-band common-caliber large-target-surface optical athermalized infrared lens and an optical system.
In order to solve the technical problems, the technical solution provided by the invention is as follows:
the invention provides an optical athermal infrared lens with two wave bands, common caliber and large target surface, which is characterized in that:
the optical filter comprises a fairing A, a first negative lens B, a second positive lens C, a third positive lens D, a fourth negative lens E, a fifth positive lens F, a sixth positive lens G and an optical filter H which are sequentially arranged along an optical path, and a rotary driving mechanism and a control system of the rotary driving mechanism of the optical filter H;
the fairing A is a spherical lens; the first negative lens B is a double-meniscus negative lens with a convex surface facing an object space; the second positive lens C is a double-meniscus positive lens with a convex surface facing the object space; the third positive lens D is a double-meniscus positive lens with a convex surface facing the object space; the fourth negative lens E is a double-meniscus negative lens with a convex surface facing the object space; the fifth positive lens F is a double-meniscus positive lens with the convex surface facing the image space; the sixth positive lens G is a double-meniscus positive lens with a convex surface facing the object space; the optical filter H is flat glass.
Further, the exit surface S6 of the second positive lens C is a diffractive surface aspheric surface;
the emergent surface S4 of the first negative lens B, the emergent surface S10 of the fourth negative lens E, the emergent surface S12 of the fifth positive lens F and the emergent surface S14 of the sixth positive lens G are all aspheric surfaces;
the incident surface S3 of the first negative lens B, the incident surface S5 of the second negative lens C, the incident surface S7 and the exit surface S8 of the third negative lens D, the incident surface S9 of the fourth negative lens E, the incident surface S11 of the fifth positive lens F, and the incident surface S13 of the sixth positive lens G are all spherical surfaces.
Furthermore, narrow band-pass films are plated on the incident surface S15 and the emergent surface S16 of the optical filter H;
and the incidence surface and the emergence surface of the fairing A, the first negative lens B, the second positive lens C, the third positive lens D, the fourth negative lens E, the fifth positive lens F and the sixth positive lens G are respectively plated with a double-waveband antireflection film.
Further, the thicknesses of the fairing A, the first negative lens B, the second positive lens C, the third positive lens D, the fourth negative lens E, the fifth positive lens F and the sixth positive lens G are respectively 4mm, 6.5mm, 9.5mm, 10.2mm, 9.1mm, 9.5mm and 5 mm.
Further, the fairing A is made of multispectral CVD zinc sulfide;
the first negative lens B is made of germanium; the second positive lens C, the third positive lens D, the fourth negative lens E, the fifth positive lens F and the sixth positive lens G are all made of chalcogenide materials;
the optical filter H is made of an N-type germanium single crystal material.
Furthermore, the optical filter H includes a plurality of fan-shaped filter regions with the same radius, and different fan-shaped filter regions are provided with films with different wave bands.
Furthermore, the device also comprises a lens cone and a plurality of space rings which are made of aluminum alloy materials;
the fairing A, the first negative lens B, the second positive lens C, the third positive lens D, the fourth negative lens E, the fifth positive lens F, the sixth positive lens G and the optical filter are all installed in the lens cone, and the plurality of space rings are arranged between adjacent lenses in the lens cone and used for positioning.
Further, the aspheric surfaces are even aspheric surfaces, and the expression thereof is as follows:
wherein z is the rise of the aspheric surface from the vertex of the aspheric surface when the aspheric surface is at the position with the height of r along the optical axis direction; c is the curvature of the aspheric vertex, which is the radius r of the aspheric vertex0Is the reciprocal of (i.e. c 1/r)0(ii) a k is a cone coefficient, and k is 0; alpha is alpha2、α3、α4、α5、α6Is a high-order aspheric coefficient;
the expression of the diffraction plane is as follows:
Φ＝A1ρ2+A2ρ4
wherein Φ is a phase of the diffraction plane; rho r/rnR is the height of the aspherical surface in the direction of the optical axis, rnIs the programmed radius of the diffraction plane; a. the1、A2Is the phase coefficient of the diffraction surface.
The invention also provides a dual-waveband common-caliber large-target-surface optical athermalization infrared optical system which is characterized in that:
the optical athermal infrared lens comprises the dual-waveband common-caliber large-target-surface optical athermal infrared lens and a staring type medium-wavelength and long-wavelength double-color refrigerating infrared detector;
and a detector protection window I of the staring type medium-wavelength and long-wavelength double-color refrigeration type infrared detector is positioned on an emergent light path of the optical filter H, and a detection surface of the detector protection window I is positioned on an image surface K of the optical athermalization infrared lens of the two-waveband common-caliber large-target-surface.
Further, the focal length of the optical athermalization infrared lens is 117mm, the F number is 2.0, and the optical field of view is 7.5 degrees multiplied by 7.5 degrees;
the filter H is a narrow band-pass filter, four fan-shaped filter areas are arranged on the filter H, and the corresponding wave bands are respectively 3.7-4.1 μm, 4.4-4.95 μm, 3.7-4.95 μm and 8-9.4 μm;
the specification of the staring type medium-long wave double-color refrigeration infrared detector is 640x512@24 mu m, the working wave bands are 3.7-4.95 um and 8-9.4 um, the F number is 2.0, and the diameter of the imaging circle is larger than phi 19.7;
the total length TTL from the incidence surface of the fairing A to the detection surface of the staring type medium-long wave bicolor refrigeration type infrared detector is less than or equal to 225mm, and the total length from the emergence surface of the optical filter H to the detection surface of the staring type medium-long wave bicolor refrigeration type infrared detector is more than or equal to 34 mm.
Compared with the prior art, the invention has the following beneficial effects:
1. the optical athermal infrared lens with the two wave bands and the same caliber and the large target surface and the optical system provided by the invention realize the design of the two wave bands and the same caliber by adopting a refraction type light path, effectively compress the outer diameter of an optical element by a secondary imaging system, select a bicolor refrigeration detector, realize the miniaturization and the lightweight of the optical system, have good imaging stability and high quality, solve the problem that the existing two wave bands and the same caliber infrared lens body has larger volume and weight, and can provide a larger field angle by the large target surface.
2. The optical athermal infrared lens and the optical system with the dual-waveband common-caliber large target surface provided by the invention adopt the matching of the multispectral CVD zinc sulfide, the chalcogenide material and the germanium which are common infrared optical materials, wherein the characteristics of high hardness and high breaking strength of the multispectral CVD zinc sulfide are utilized as the material of the fairing A, so that the reliability and the safety of the system are improved.
3. The optical athermal infrared lens and the optical system with the two wave bands, the common caliber and the large target surface provided by the invention have the advantages that all lens materials are reasonably selected, the optical athermal design of a temperature range of-45 ℃ to +65 ℃ is realized by combining and matching with lens cone materials, the defocusing caused by expansion with heat and contraction with cold along with the temperature change of the lens cone is compensated, the system can clearly image in the wide temperature range, the good imaging quality is kept, and the optical structure is simple and is easy to process.
4. According to the optical athermalization infrared lens with the two wave bands and the large target surface and the optical system, the optical filter H comprises the plurality of fan-shaped filter areas, and the different fan-shaped filter areas are provided with the films with different wave bands, so that the integration time of the detector under the condition of a single optical filter H is increased, the image gain is improved, and the target characteristics can be further highlighted.
5. The dual-waveband common-caliber large-target-surface optical athermalization infrared lens and the optical system provided by the invention have the advantages that the selected 640x512@24 mu m refrigeration detector has a large target surface, the field angle can be increased, and the search range is enlarged.
Drawings
FIG. 1 is a schematic structural diagram of a dual-band common-aperture large-target-surface optical athermalized infrared optical system of the present invention;
FIG. 2 is a diagram of the optical path of a dual-band common-aperture large-target-surface optical athermalized infrared optical system of the present invention;
FIG. 3 is a schematic structural diagram of an optical athermalized infrared lens filter H with a dual-waveband common-aperture large target surface according to the present invention;
FIG. 4 is a MTF graph (MTF @21lp/mm) of the middle band transfer function of the optical athermal infrared optical system of the present invention with a two-band common aperture and a large target surface, wherein a is a theoretical diffraction limit line;
FIG. 5 is a long-wave band transfer function MTF graph (MTF @21lp/mm) of the optical athermalization infrared optical system of the present invention with a two-wave band common aperture and a large target surface, wherein b is a theoretical diffraction limit line;
description of reference numerals:
the system comprises a fairing A, a first negative lens B, a second positive lens C, a third positive lens D, a fourth negative lens E, a fifth positive lens F, a sixth positive lens G, an optical filter H, a detector protection window I, a detector optical filter J and an image surface K;
an incident surface S1 of the cowling a, an exit surface S2 of the cowling a, an incident surface S3 of the first negative lens B, an exit surface S4 of the first negative lens B, an incident surface S5 of the second negative lens C, an exit surface S6 of the second negative lens C, an incident surface S7 of the third negative lens D, an exit surface S8 of the third negative lens D, an incident surface S9 of the fourth negative lens E, an exit surface S10 of the fourth negative lens E, an incident surface S11 of the fifth positive lens F, an exit surface S12 of the fifth positive lens F, an incident surface S13 of the sixth positive lens G, an exit surface S14 of the sixth positive lens G, an incident surface S15 of the filter H, and an exit surface S16 of the filter H.
Detailed Description
The invention is further described below with reference to the figures and examples.
A dual-waveband common-caliber large-target-surface optical athermalization infrared lens is shown in figure 1 and comprises a lens barrel, a fairing A, a first negative lens B, a second positive lens C, a third positive lens D, a fourth negative lens E, a fifth positive lens F, a sixth positive lens G, an optical filter H, a rotary driving mechanism of the optical filter H and a control system of the rotary driving mechanism, wherein the fairing A, the first negative lens B, the second positive lens C, the third positive lens D, the fourth negative lens E, the fifth positive lens F, the sixth positive lens G and the optical filter H are arranged in the lens barrel in sequence along an optical path; the optical filter H is fixed on a filter wheel of the rotary driving mechanism and can be rotationally switched according to the imaging requirement; and each lens and the optical filter H are positioned through a space ring, and the lens cone and the space ring are made of aluminum alloy materials.
The fairing A is a spherical lens; the first negative lens B is a double-meniscus negative lens bent towards an object space; the second positive lens C is a double-meniscus positive lens bent towards the object space; the third positive lens D is a double-meniscus positive lens bent towards the object space; the fourth negative lens E is a double-meniscus negative lens bent towards the object space; the fifth positive lens F is a double-meniscus positive lens bent to the image space; the sixth positive lens G is a double-meniscus positive lens bent towards the object space; the optical filter H is flat glass. The thicknesses of the fairing A, the first negative lens B, the second positive lens C, the third positive lens D, the fourth negative lens E, the fifth positive lens F and the sixth positive lens G are respectively 4mm, 6.5mm, 9.5mm, 10.2mm, 9.1mm, 9.5mm and 5 mm.
The exit surface S6 of the second positive lens C is a diffraction surface aspheric surface; the emergent surface S4 of the first negative lens B, the emergent surface S10 of the fourth negative lens E, the emergent surface S12 of the fifth positive lens F and the emergent surface S14 of the sixth positive lens G are all aspheric surfaces; the incident surface S3 of the first negative lens B, the incident surface S5 of the second negative lens C, the incident surface S7 and the exit surface S8 of the third negative lens D, the incident surface S9 of the fourth negative lens E, the incident surface S11 of the fifth positive lens F, and the incident surface S13 of the sixth positive lens G are all spherical surfaces. Narrow band-pass films are plated on the incident surface S15 and the emergent surface S16 of the optical filter H; and the incidence surface and the emergence surface of the fairing A, the first negative lens B, the second positive lens C, the third positive lens D, the fourth negative lens E, the fifth positive lens F and the sixth positive lens G are respectively plated with a double-waveband antireflection film.
The fairing A is made of multispectral CVD zinc sulfide; the first negative lens B is made of germanium; the second positive lens C, the third positive lens D, the fourth negative lens E, the fifth positive lens F and the sixth positive lens G are all made of chalcogenide materials; the optical filter H is made of an N-type germanium single crystal material.
The optical filter H comprises a plurality of fan-shaped filter areas with the same radius, and films with different wave bands are arranged on different fan-shaped filter areas. As shown in fig. 3, the filter H is divided into 4 90 ° fan-shaped filter regions, and the corresponding wavelength bands are 3.7 μm to 4.1 μm, 4.4 μm to 4.95 μm, 3.7 μm to 4.95 μm, and 8 μm to 9.4 μm, respectively, so that the integration time of the detector under a single filter H is increased, the image gain is improved, and the target characteristics can be further highlighted.
The invention also provides a dual-waveband co-aperture large-target-surface optical athermalization infrared optical system which comprises the dual-waveband co-aperture large-target-surface optical athermalization infrared lens and a staring type medium-wavelength double-color refrigeration infrared detector; and a detector protection window I of the staring type medium-wavelength and long-wavelength double-color refrigeration type infrared detector is positioned on an emergent light path of the optical filter H, and a detection surface of the detector protection window I is positioned on an image surface K of the optical athermalization infrared lens of the two-waveband common-caliber large-target-surface. The light rays sequentially pass through a first negative lens B, a second positive lens C, a third positive lens D, a fourth negative lens E, a fifth positive lens F, a sixth positive lens G and an optical filter H for transmission, pass through a detector protection window I of a staring type medium-long wave double-color refrigeration type infrared detector and a detector optical filter J, and finally reach an image surface K.
The focal length of the optical athermalization infrared lens is 117mm, the F number is 2.0, and the optical field of view is 7.5 degrees multiplied by 7.5 degrees; the filter H is a narrow band-pass filter, four fan-shaped filter areas are arranged on the filter H, and the corresponding wave bands are respectively 3.7-4.1 μm, 4.4-4.95 μm, 3.7-4.95 μm and 8-9.4 μm; the specification of the staring type medium-long wave double-color refrigeration infrared detector is 640x512@24 mu m, the working wave bands are 3.7-4.95 um and 8-9.4 um, the F number is 2.0, and the diameter of the imaging circle is larger than phi 19.7; the total length TTL from the incidence surface of the fairing A to the detection surface of the staring type medium-long wave bicolor refrigeration type infrared detector is less than or equal to 225mm, and the total length from the emergence surface of the optical filter H to the detection surface of the staring type medium-long wave bicolor refrigeration type infrared detector is more than or equal to 34 mm. FIG. 2 is a light path diagram of the optical athermalized infrared optical system of the present invention with two bands sharing a caliber and a large target surface.
The invention has obvious advantages in the aspects of volume, weight, optical axis consistency and field angle, is an optical athermalization design at minus 45 ℃ to plus 65 ℃, and can ensure clear imaging in the temperature range. Table 1 shows the structural parameters of the optical system of the present invention.
TABLE 1 optical System construction parameters
| Surface number | Radius of curvature (mm) | Spacing (mm) | Material | Remarks for note |
| S1 | 59.0 | 4.0 | Multispectral CVD zinc sulfide | |
| S2 | 55.0 | 20.0 | ||
| S3 | 239.1 | 6.5 | Germanium (Ge) | |
| S4 | 170.7 | 0.8 | Aspherical surface | |
| S5 | 130.4 | 9.5 | Chalcogenide material | |
| S6 | 814.8 | 99 | Diffractive surface + aspherical surface | |
| S7 | 40.3 | 10.2 | Chalcogenide material | |
| S8 | 48.8 | 6.2 | ||
| S9 | 18.0 | 9.1 | Chalcogenide material | |
| S10 | 10.6 | 25.4 | Aspherical surface | |
| S11 | -23.4 | 9.5 | Chalcogenide material | |
| S12 | -18.3 | 28.6 | Aspherical surface | |
| S13 | 39.6 | 5.0 | Chalcogenide material | |
| S14 | 291.5 | 2.5 | Aspherical surface | |
| S15 | Infinity | 2.0 | Germanium (Ge) | Optical filter H |
| S16 | Infinity | 5.0 |
The aspherical surfaces mentioned in the above lenses are all even-order aspherical surfaces, and the expression thereof is as follows:
wherein z is a distance from the aspheric surface vertex at a position of r height of the aspheric surface along the optical axis directionRise of (2); c is the curvature of the aspheric vertex, which is the radius r of the aspheric vertex0Is the reciprocal of (i.e. c 1/r)0(ii) a k is a cone coefficient, and k is 0; alpha is alpha2、α3、α4、α5、α6Are high-order aspheric coefficients. Table 2 shows aspheric coefficients of the surfaces S4, S6, S10, S12 and S14, α6Was not used.
TABLE 2 aspheric surface coefficient table
The expression of the diffraction surface mentioned in the above lens is as follows:
Φ＝A1ρ2+A2ρ4
wherein Φ is a phase of the diffraction plane; rho r/rnR is the height of the aspherical surface in the direction of the optical axis, rnIs the programmed radius of the diffraction plane; a. the1、A2Is the phase coefficient of the diffraction surface.
TABLE 3 surface S6 diffraction coefficients
| Surface of | A1 | A2 |
| S6 | -81.27 | 0.2635 |
Fig. 4 is a middle band transfer function MTF graph (MTF @21lp/mm) of the optical athermalization infrared optical system of the two-band common-aperture large target surface of the present invention, and fig. 5 is a long band transfer function MTF graph (MTF @21lp/mm) of the optical athermalization infrared optical system of the two-band common-aperture large target surface of the present invention, and it can be seen from fig. 4 and 5 that, under the middle band and the long band, the transfer function line components of the optical path are respectively close to the theoretical diffraction limit a and the diffraction limit b, which shows that the actual optical path is substantially consistent with the designed optical path and the imaging quality is good.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same, and it is obvious for a person skilled in the art to modify the specific technical solutions described in the foregoing embodiments or to substitute part of the technical features, and these modifications or substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions protected by the present invention.
Claims (10)
1. The utility model provides an optics of two wave bands common-bore large target surface does not have thermalization infrared camera lens which characterized in that:
the optical filter comprises a fairing A, a first negative lens B, a second positive lens C, a third positive lens D, a fourth negative lens E, a fifth positive lens F, a sixth positive lens G and an optical filter H which are sequentially arranged along an optical path, and a rotary driving mechanism and a control system of the rotary driving mechanism of the optical filter H;
the fairing A is a spherical lens; the first negative lens B is a double-meniscus negative lens with a convex surface facing an object space; the second positive lens C is a double-meniscus positive lens with a convex surface facing the object space; the third positive lens D is a double-meniscus positive lens with a convex surface facing the object space; the fourth negative lens E is a double-meniscus negative lens with a convex surface facing the object space; the fifth positive lens F is a double-meniscus positive lens with the convex surface facing the image space; the sixth positive lens G is a double-meniscus positive lens with a convex surface facing the object space; the optical filter H is flat glass.
2. The dual-band co-aperture large target surface optical athermalization infrared lens of claim 1, wherein:
the exit surface S6 of the second positive lens C is a diffraction surface aspheric surface;
the emergent surface S4 of the first negative lens B, the emergent surface S10 of the fourth negative lens E, the emergent surface S12 of the fifth positive lens F and the emergent surface S14 of the sixth positive lens G are all aspheric surfaces;
the incident surface S3 of the first negative lens B, the incident surface S5 of the second negative lens C, the incident surface S7 and the exit surface S8 of the third negative lens D, the incident surface S9 of the fourth negative lens E, the incident surface S11 of the fifth positive lens F, and the incident surface S13 of the sixth positive lens G are all spherical surfaces.
3. The dual-band co-aperture large target surface optical athermalization infrared lens of claim 2, wherein:
narrow band-pass films are plated on the incident surface S15 and the emergent surface S16 of the optical filter H;
and the incidence surface and the emergence surface of the fairing A, the first negative lens B, the second positive lens C, the third positive lens D, the fourth negative lens E, the fifth positive lens F and the sixth positive lens G are respectively plated with a double-waveband antireflection film.
4. The dual-band co-aperture large target surface optical athermalization infrared lens of claim 3, wherein:
the thicknesses of the fairing A, the first negative lens B, the second positive lens C, the third positive lens D, the fourth negative lens E, the fifth positive lens F and the sixth positive lens G are respectively 4mm, 6.5mm, 9.5mm, 10.2mm, 9.1mm, 9.5mm and 5 mm.
5. The dual-band co-aperture large target surface optical athermalization infrared lens of claim 4, wherein:
the fairing A is made of multispectral CVD zinc sulfide;
the first negative lens B is made of germanium; the second positive lens C, the third positive lens D, the fourth negative lens E, the fifth positive lens F and the sixth positive lens G are all made of chalcogenide materials;
the optical filter H is made of an N-type germanium single crystal material.
6. The dual-band co-aperture large target surface optical athermalization infrared lens of claim 5, wherein:
the optical filter H comprises a plurality of fan-shaped filter areas with the same radius, and films with different wave bands are arranged on different fan-shaped filter areas.
7. The dual-band co-aperture large target surface optical athermalization infrared lens of claim 6, wherein:
the lens barrel is made of aluminum alloy materials and comprises a plurality of space rings;
the fairing A, the first negative lens B, the second positive lens C, the third positive lens D, the fourth negative lens E, the fifth positive lens F, the sixth positive lens G and the optical filter are all installed in the lens cone, and the plurality of space rings are arranged between adjacent lenses in the lens cone and used for positioning.
8. The dual-band co-aperture large target surface optical athermalization infrared lens of claim 7, wherein:
the aspheric surfaces are even aspheric surfaces, and the expression is as follows:
wherein z is the rise of the aspheric surface from the vertex of the aspheric surface when the aspheric surface is at the position with the height of r along the optical axis direction; c is the curvature of the aspheric vertex, which is the radius r of the aspheric vertex0Is the reciprocal of (i.e. c 1/r)0(ii) a k is a cone coefficient, and k is 0; alpha is alpha2、α3、α4、α5、α6Is a high-order aspheric coefficient;
the expression of the diffraction plane is as follows:
Φ＝A1ρ2+A2ρ4
wherein Φ is a phase of the diffraction plane; rho r/rnR is the height of the aspherical surface in the direction of the optical axis, rnIs the programmed radius of the diffraction plane; a. the1、A2Is the phase coefficient of the diffraction surface.
9. The utility model provides an optics of two wave bands common-bore large target surface does not have infrared optical system of thermalization which characterized in that:
an optical athermal infrared lens comprising the dual-band common-aperture large target surface of any one of claims 1 to 8, and a staring type medium-wavelength two-color refrigeration type infrared detector;
and a detector protection window I of the staring type medium-wavelength and long-wavelength double-color refrigeration type infrared detector is positioned on an emergent light path of the optical filter H, and a detection surface of the detector protection window I is positioned on an image surface K of the optical athermalization infrared lens of the two-waveband common-caliber large-target-surface.
10. The dual band common aperture large target surface optical athermalized infrared optical system of claim 9, wherein:
the focal length of the optical athermalization infrared lens is 117mm, the F number is 2.0, and the optical field of view is 7.5 degrees multiplied by 7.5 degrees;
the filter H is a narrow band-pass filter, four fan-shaped filter areas are arranged on the filter H, and the corresponding wave bands are respectively 3.7-4.1 μm, 4.4-4.95 μm, 3.7-4.95 μm and 8-9.4 μm;
the specification of the staring type medium-long wave double-color refrigeration infrared detector is 640x512@24 mu m, the working wave bands are 3.7-4.95 um and 8-9.4 um, the F number is 2.0, and the diameter of the imaging circle is larger than phi 19.7;
the total length TTL from the incidence surface of the fairing A to the detection surface of the staring type medium-long wave bicolor refrigeration type infrared detector is less than or equal to 225mm, and the total length from the emergence surface of the optical filter H to the detection surface of the staring type medium-long wave bicolor refrigeration type infrared detector is more than or equal to 34 mm.
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| CN205581389U (en) * | 2016-04-29 | 2016-09-14 | 中山联合光电科技股份有限公司 | High-pixel, high-illuminance, low-cost infrared thermal imaging optical system |
| CN109324398B (en) * | 2019-01-02 | 2019-04-02 | 江西联益光学有限公司 | Optical imaging lens and imaging device |
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