CN209879127U - Wavefront coding infrared athermalization continuous zoom lens - Google Patents
Wavefront coding infrared athermalization continuous zoom lens Download PDFInfo
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- CN209879127U CN209879127U CN201920448255.2U CN201920448255U CN209879127U CN 209879127 U CN209879127 U CN 209879127U CN 201920448255 U CN201920448255 U CN 201920448255U CN 209879127 U CN209879127 U CN 209879127U
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- 230000003287 optical effect Effects 0.000 claims abstract description 31
- 230000005499 meniscus Effects 0.000 claims description 11
- 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
- 238000003384 imaging method Methods 0.000 description 7
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
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Abstract
The utility model belongs to a zoom system has bulky, with high costs, the poor technical problem of reliability to current infrared continuous zoom system, provides an infrared athermalization continuous zoom lens of wave front coding. The optical lens comprises a front fixed group, a zoom group, a compensation group and a rear fixed group which are coaxially arranged from left to right along the optical axis direction in sequence, wherein the left side of the front fixed group is an object plane, and the right side of the rear fixed group is an image plane; the front fixed group is composed of a first lens; the zoom group is composed of a second lens, the compensation group is composed of a third lens, the rear fixing group is composed of two lenses, a fourth lens and a sixth lens are sequentially arranged from left to right, a phase plate is coaxially arranged between the fourth lens and the sixth lens, the zoom group and the compensation group can move in opposite directions or back to back along an optical axis, the zoom group is used for realizing continuous change of focal length, and the compensation group is used for compensating image surface movement caused by the change of the focal length.
Description
Technical Field
The utility model belongs to a zoom system, concretely relates to wave front coding infrared athermalization continuous zoom lens.
Background
Infrared zoom optics are a very powerful passive detection optics that can search, locate and continuously track objects and targets that emit infrared light under infrared background radiation and other disturbances. Therefore, the method has wide application prospect in the fields of target searching, early warning detection, security monitoring and the like.
The temperature coefficient of the refractive index of the infrared material is 1-2 orders of magnitude larger than that of visible glass, and in the field of high-precision detection and early warning, an infrared system is required to work within the temperature range of-40 to +60 ℃, so the change of the environmental temperature has great influence on the performance of the infrared system.
At present, an infrared continuous zooming system mostly adopts active compensation measures to keep stable imaging performance of an infrared optical system in a wide temperature range, and the zooming lens needs mechanisms such as a motor, a control system, a sensor, a moving assembly and the like to focus temperature, so that the whole system has large volume and high cost; and at high temperature and low temperature, due to the expansion with heat and contraction with cold of the moving assembly material, the fit clearance is changed, the clamping phenomenon may occur, and the system reliability is reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the technical problem that the existing infrared continuous zooming system has large volume, high cost and poor reliability, and providing a wavefront coding infrared athermalization continuous zooming lens.
The technical scheme of the utility model is that:
a wavefront coding infrared athermalization continuous zoom lens is characterized in that: the device comprises a front fixed group, a zoom group, a compensation group and a rear fixed group which are coaxially arranged from left to right in sequence along the optical axis direction, wherein the left side of the front fixed group is an object plane, and the right side of the rear fixed group is an image plane; the front fixed group consists of a first lens, and the first lens is a meniscus lens with positive focal power bent to the image direction; the zoom group consists of a second lens, and the second lens is a negative focal power biconcave lens; the compensation group is composed of a third lens, and the third lens is a double-convex lens with positive focal power; the rear fixed group consists of two lenses, a fourth lens and a sixth lens are sequentially arranged from left to right, the fourth lens is a meniscus lens with negative focal power bent to the object space, and the sixth lens is a meniscus lens with positive focal power bent to the object space; a phase plate is coaxially arranged between the fourth lens and the sixth lens; the zoom group and the compensation group can move in the opposite direction or in the opposite direction along the optical axis, the zoom group is used for realizing continuous change of focal length, and the compensation group is used for compensating image surface movement caused by the change of the focal length.
Further, from left to right along the optical axis; the distance between the rear surface of the first lens of the front fixed group and the front surface of the second lens of the variable-power group is 22.64 mm-4.55 mm; the distance between the rear surface of the second lens of the variable-power group and the front surface of the third lens of the compensation group is 1.17-27.81 mm; the distance between the rear surface of the third lens of the compensation group and the front surface of the fourth lens of the rear fixed group is 11.2 mm-2.65 mm; the distance between the rear surface of the fourth lens of the rear fixed group and the front surface of the phase plate is 1.17 mm; the distance from the rear surface of the phase plate to the front surface of the sixth lens of the rear fixed group is 1.38 mm.
Further, the first lens, the second lens, the third lens, the fourth lens and the sixth lens are all germanium lenses.
Further, the thickness of the first lens is 8.2mm, the front surface of the first lens is a spherical surface, and the curvature radius is 63.96; the posterior surface is spherical with a radius of curvature of 65.19.
Further, the second lens has a thickness of 7mm, an aspherical front surface, a radius of curvature of-179.15, and an aspherical surface coefficient a of-2.31 × 10-7,B＝3.61×10-10(ii) a The posterior surface is spherical with a radius of curvature of 420.16.
Further, the third lensThe mirror has a thickness of 8.98mm, an aspherical front surface with a radius of curvature of 116.86, and an aspherical surface coefficient A of-3.04X 10-7,B＝-2.13×10-10，C＝-1.83×10-13(ii) a The posterior surface is spherical with a radius of curvature of-238.81.
Further, the thickness of the fourth lens is 9.62mm, the front surface of the fourth lens is a spherical surface, and the curvature radius of the fourth lens is-31.17; the rear surface is aspherical with a radius of curvature of-63.04 and an aspherical coefficient a of 3.75 × 10-6,B＝2.59×10-9。
Further, the phase plate is a cubic phase plate, the thickness of the cubic phase plate is 4mm, and the cubic phase plate coefficient a is 7 × 10-6。
Further, the thickness of the sixth lens is 15mm, the front surface of the sixth lens is a spherical surface, and the curvature radius is-283.73; the rear surface is a diffraction surface with a radius of curvature of-56.92, a diffraction surface coefficient of-5.45X 10-5 (C1) and-1.53X 10 (C2)-7，C3＝5.81×10-10。
Compared with the prior art, the utility model, following technological effect has:
1. the utility model provides a wavefront coding infrared athermalization continuous zoom lens, in-40 ℃ - +60 ℃ operating temperature scope, in 19mm ~ 38mm full focus scope, need not temperature focusing, can keep the imaging performance unanimous, the full focus within range is good through the formation of image quality after decoding, the image plane is stable; and a temperature focusing motor sensor and a control system are not needed, and the optical system has a compact structure, a small volume, high imaging quality and high stability.
2. The utility model discloses an infrared athermalization zoom lens of wave front coding adopts the coding form to eliminate the influence of temperature to optical system, and simple structure is compact, has the characteristics that reliability and stability are high, maintainability are good on the wholeness ability to this kind of compensation mode is with low costs.
Drawings
FIG. 1 is a diagram of a long-focus state optical path according to an embodiment of the present invention;
FIG. 2 is a diagram of the focal state light path in the embodiment of the present invention;
FIG. 3 is a short focus state light path diagram according to an embodiment of the present invention;
FIG. 4a is a graph showing the MTF curve of the optical system in a telephoto state at a spatial frequency of 25lp/mm and a temperature of +20 ℃ in accordance with the embodiment of the present invention;
FIG. 4b is a graph showing the MTF curve of the optical system in the telephoto state at a spatial frequency of 25lp/mm and a temperature of-40 ℃ in accordance with the embodiment of the present invention;
FIG. 4c is a graph showing the MTF curve of the optical system in a telephoto state at a spatial frequency of 25lp/mm and a temperature of +60 ℃ in accordance with the embodiment of the present invention;
FIG. 5a is a graph showing the MTF curve of the optical system in the middle focus state at a spatial frequency of 25lp/mm and a temperature of +20 ℃ in accordance with the embodiment of the present invention;
FIG. 5b is a graph showing the MTF curve of the optical system in the middle focal state at a spatial frequency of 25lp/mm and a temperature of-40 deg.C in accordance with the embodiment of the present invention;
FIG. 5c is a graph showing the MTF curve of the optical system in the middle focal state at a spatial frequency of 25lp/mm and a temperature of +60 ℃ in accordance with the embodiment of the present invention;
FIG. 6a is a graph showing the MTF curve of the short focus optical system of the embodiment of the present invention with a spatial frequency of 25lp/mm and a temperature of +20 ℃;
FIG. 6b is a graph showing the MTF curve of the optical system in the short focus state at a spatial frequency of 25lp/mm and a temperature of-40 deg.C in accordance with the embodiment of the present invention;
FIG. 6c is a graph showing the MTF curve of the short focus optical system of the embodiment of the present invention with a spatial frequency of 25lp/mm and a temperature of +60 ℃;
wherein the reference numbers are as follows:
1-first lens, 2-second lens, 3-third lens, 4-fourth lens, 5-phase plate, 6-sixth lens.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific embodiments.
As shown in fig. 1, 2, 3 and table 1, the wavefront coding long-wave infrared athermalization continuous zoom optical system with 19mm to 38mm/F1.2 provided by this embodiment adopts 5 sets of 6-piece structures, the focal length variation range is 19mm to 38mm, the F number is 1.2, and the system is suitable for a long-wave infrared thermal imager with a resolution of 640 × 480 and a pixel size of 20 μm.
The wave-front coding infrared athermalization continuous zoom lens comprises a front fixed group, a zoom group, a compensation group and a rear fixed group which are coaxially arranged from left to right along the direction of an optical axis, wherein the left side of the front fixed group is an object plane, and the right side of the rear fixed group is an image plane; the front fixed group consists of a first lens 1, and the first lens 1 is a meniscus single crystal germanium lens with positive focal power bent to the image side; the zoom group consists of a second lens 2, the second lens 2 is a negative focal power biconcave single crystal germanium lens, and the focal length connection change is realized by moving along the axial direction of an optical axis; the compensation group is composed of a third lens 3, the third lens 3 is a positive focal power double-convex germanium lens and moves along the optical axis regularly to compensate the image surface movement caused by focal length change; the rear fixed group consists of two lenses, a fourth lens 4 and a sixth lens 6 are sequentially arranged from left to right, the fourth lens 4 is a meniscus germanium lens with negative focal power bent to an object space, the sixth lens 6 is a meniscus germanium lens with positive focal power bent to the object space, and the rear fixed group converges light rays to form an image on a target surface of the thermal imager; the phase plate 5 is coaxially arranged between the fourth lens 4 and the sixth lens 6, the phase plate 5 is a third-order phase plate, and the third-order phase plate modulates the wave front and keeps imaging consistency at different temperatures.
The zooming group and the compensation group can move in the opposite direction or in the opposite direction along the optical axis, the zooming group is used for realizing continuous change of focal length, and the compensation group is used for compensating image surface movement caused by the change of the focal length. In the process that the optical system changes from short focus to long focus, the zoom group moves to the image side, the continuous change of the focal length is realized, the compensation group moves to the object side, and the continuous zooming is realized through the interval change. In the process of changing from long focus to short focus, the direction is opposite to the change from short focus to long focus, the zoom group faces to the object space, and the compensation group faces to the image space.
From left to right along the optical axis, the distance between the rear surface of the front fixed group first lens 1 and the front surface of the variable power group second lens 2 ranges from 22.64mm to 4.55mm, the distance between the rear surface of the variable power group second lens 2 and the front surface of the compensation group third lens 3 ranges from 1.17mm to 27.81mm, the distance between the front surface of the compensation group third lens 3 and the front surface of the rear fixed group fourth lens 4 ranges from 11.2mm to 2.65mm, the distance between the rear surface of the rear fixed group fourth lens and the front surface of the phase plate 5 ranges from 1.17mm, and the distance between the rear surface of the phase plate 5 and the front surface of the rear fixed group sixth lens 6 ranges from 1.38 mm.
TABLE 1 concrete parameters (unit: mm) of each lens of the optical system of this example
In the continuous zooming system of the embodiment, the front fixed group, the zoom group, the compensation group, the phase plate 5 and the rear fixed group act together to image the targets with different focal lengths on the primary image surface, the fourth lens 4 (a meniscus germanium lens with negative focal power bent towards the object space) and the sixth lens 6 (a meniscus germanium lens with positive focal power bent towards the object space) converge the light to image on the target surface of the thermal imager, and the phase plate 5 modulates the wavefront to keep the imaging consistency at different temperatures. The embodiment adopts a coding mode to eliminate the influence of temperature on an optical system, has simple and compact structure, has the advantages of high reliability and stability and good maintainability on the overall performance, and has lower cost in the compensation mode.
As shown in fig. 4a to 6c, the MTF curves of the continuous zoom system in the long-focus, middle-focus and short-focus states at a spatial frequency of 25lp/mm are substantially consistent within the full focus range and the temperature range of-40 ℃ to +60 ℃, so as to satisfy the requirement of decoding the obtained image.
Experiments show that the continuous zooming system of the embodiment obtains images at different temperatures in a long focus, a middle focus and a short focus, and the imaging consistency is good at different temperatures; the decoded images of the long focus, the middle focus and the short focus of the system at different temperatures are clear in the long focus, the middle focus and the short focus at +20 ℃, -40 ℃ and +60 ℃, the imaging quality is good, the influence of the system temperature is eliminated, and the athermalization characteristic of the continuous zooming system is realized.
Claims (9)
1. A wave-front coding infrared athermalization continuous zoom lens is characterized in that: the device comprises a front fixed group, a zoom group, a compensation group and a rear fixed group which are coaxially arranged from left to right in sequence along the optical axis direction, wherein the left side of the front fixed group is an object plane, and the right side of the rear fixed group is an image plane;
the front fixed group consists of a first lens (1), and the first lens (1) is a meniscus lens with positive focal power bent to the image side;
the zoom group consists of a second lens (2), and the second lens (2) is a negative focal power biconcave lens;
the compensation group is composed of a third lens (3), and the third lens (3) is a double-convex lens with positive focal power;
the rear fixed group consists of two lenses, a fourth lens (4) and a sixth lens (6) are sequentially arranged from left to right, the fourth lens (4) is a meniscus lens with negative focal power bent to the object space, and the sixth lens (6) is a meniscus lens with positive focal power bent to the object space;
a phase plate (5) is coaxially arranged between the fourth lens (4) and the sixth lens (6);
the zoom group and the compensation group can move in the opposite direction or in the opposite direction along the optical axis, the zoom group is used for realizing continuous change of focal length, and the compensation group is used for compensating image surface movement caused by the change of the focal length.
2. The wavefront coding infrared athermalization continuous zoom lens of claim 1, wherein: from left to right along the optical axis;
the distance between the rear surface of the front fixed group first lens (1) and the front surface of the variable power group second lens (2) is 22.64 mm-4.55 mm;
the distance between the rear surface of the second lens (2) of the variable-power group and the front surface of the third lens (3) of the compensation group is 1.17-27.81 mm;
the distance between the rear surface of the compensation group third lens (3) and the front surface of the rear fixed group fourth lens (4) is 11.2 mm-2.65 mm;
the distance between the rear surface of the fourth lens (4) of the rear fixed group and the front surface of the phase plate (5) is 1.17 mm;
the distance between the back surface of the phase plate (5) and the front surface of the sixth lens (6) of the back fixed group is 1.38 mm.
3. The wavefront coding infrared athermalization continuous zoom lens of claim 1 or 2, wherein: the first lens (1), the second lens (2), the third lens (3), the fourth lens (4) and the sixth lens (6) are all germanium lenses.
4. The wavefront coding infrared athermalization continuous zoom lens of claim 3, wherein: the thickness of the first lens (1) is 8.2mm, the front surface of the first lens is a spherical surface, and the curvature radius of the first lens is 63.96;
the posterior surface is spherical with a radius of curvature of 65.19.
5. The wavefront coding infrared athermalization continuous zoom lens of claim 4, wherein: the second lens (2) has a thickness of 7mm, an aspherical front surface and a curvature radius of-179.15, and an aspherical surface coefficient A of-2.31 × 10-7,B＝3.61×10-10；
The posterior surface is spherical with a radius of curvature of 420.16.
6. The wavefront coding infrared athermalization continuous zoom lens of claim 5, wherein: the third lens (3) has a thickness of 8.98mm, an aspherical front surface, a radius of curvature of 116.86, and an aspherical surface coefficient A of-3.04X 10-7,B＝-2.13×10-10，C＝-1.83×10-13；
The posterior surface is spherical with a radius of curvature of-238.81.
7. The wavefront coding infrared athermalization continuous zoom lens of claim 6, wherein: the thickness of the fourth lens (4) is 9.62mm, the front surface of the fourth lens is a spherical surface, and the curvature radius is-31.17;
the rear surface is aspherical with a radius of curvature of-63.04 and an aspherical coefficient a of 3.75 × 10-6,B＝2.59×10-9。
8. The wavefront coding infrared athermalization continuous zoom lens of claim 7, wherein: the phase plate (5) is a cubic phase plate, the thickness of the cubic phase plate is 4mm, and the coefficient a of the cubic phase plate is 7 multiplied by 10-6。
9. The wavefront coded infrared athermalized zoom lens of claim 8, wherein: the thickness of the sixth lens (6) is 15mm, the front surface of the sixth lens is a spherical surface, and the curvature radius is-283.73;
the rear surface is a diffraction surface with a radius of curvature of-56.92, a diffraction surface coefficient of-5.45X 10-5 (C1) and-1.53X 10 (C2)-7，C3＝5.81×10-10。
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| CN201920448255.2U CN209879127U (en) | 2019-04-03 | 2019-04-03 | Wavefront coding infrared athermalization continuous zoom lens |
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| CN201920448255.2U CN209879127U (en) | 2019-04-03 | 2019-04-03 | Wavefront coding infrared athermalization continuous zoom lens |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110133832A (en) * | 2019-04-03 | 2019-08-16 | 中国科学院西安光学精密机械研究所 | A kind of wavefront coded infrared no thermalization continuous magnification lens |
| CN112763164A (en) * | 2021-02-03 | 2021-05-07 | 宁波格劳博智能工业有限公司 | Airtight check out test set of power battery module |
-
2019
- 2019-04-03 CN CN201920448255.2U patent/CN209879127U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110133832A (en) * | 2019-04-03 | 2019-08-16 | 中国科学院西安光学精密机械研究所 | A kind of wavefront coded infrared no thermalization continuous magnification lens |
| CN110133832B (en) * | 2019-04-03 | 2024-05-31 | 中国科学院西安光学精密机械研究所 | Wavefront coding infrared athermalized continuous zoom lens |
| CN112763164A (en) * | 2021-02-03 | 2021-05-07 | 宁波格劳博智能工业有限公司 | Airtight check out test set of power battery module |
| CN112763164B (en) * | 2021-02-03 | 2021-11-19 | 宁波格劳博智能工业有限公司 | Airtight check out test set of power battery module |
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