CN115097608A - Short wave infrared telescope objective lens - Google Patents
Short wave infrared telescope objective lens Download PDFInfo
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- CN115097608A CN115097608A CN202210780869.7A CN202210780869A CN115097608A CN 115097608 A CN115097608 A CN 115097608A CN 202210780869 A CN202210780869 A CN 202210780869A CN 115097608 A CN115097608 A CN 115097608A
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- China
- Prior art keywords
- lens
- objective lens
- wave infrared
- short wave
- telescopic objective
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- 230000005499 meniscus Effects 0.000 claims abstract description 20
- 230000003287 optical effect Effects 0.000 claims abstract description 15
- 230000005540 biological transmission Effects 0.000 claims abstract description 4
- 239000005357 flat glass Substances 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 6
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims description 4
- 239000005387 chalcogenide glass Substances 0.000 claims description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 239000010453 quartz Substances 0.000 claims description 2
- 238000003384 imaging method Methods 0.000 abstract description 10
- 238000005286 illumination Methods 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 abstract description 4
- 230000004075 alteration Effects 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 230000000007 visual effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 8
- 238000012546 transfer Methods 0.000 description 4
- 238000000701 chemical imaging Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000003331 infrared imaging Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003333 near-infrared imaging Methods 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 239000005304 optical glass Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/02—Telephoto objectives, i.e. systems of the type + - in which the distance from the front vertex to the image plane is less than the equivalent focal length
-
- 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
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/22—Telecentric objectives or lens systems
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Lenses (AREA)
Abstract
The invention discloses a short-wave infrared telescope objective which is a coaxial transmission type optical system, has a working wave band of 760 nm-3000 nm, and comprises a piece of window glass and eight spherical lenses. The first plane window sheet, the second negative meniscus lens, the third positive meniscus lens, the fourth positive biconvex lens, the aperture diaphragm, the fifth positive biconvex lens, the sixth negative meniscus lens, the seventh positive meniscus lens, the eighth negative meniscus lens and the ninth positive biconvex lens are arranged in sequence along the light incidence direction. The invention is suitable for infrared band width of 760nm to 3000 nm; the visual angle is large, the spherical aberration and distortion are small, the image surface illumination is uniform, and the image space is telecentric; in the temperature range of-40 to 60 ℃, the diffuse spot is far smaller than one pixel, and the imaging quality is close to the diffraction limit; the processing and manufacturing cost is low; high energy utilization rate, strong light collecting capacity, good heat adaptability and easy debugging and detection.
Description
Technical Field
The invention belongs to the technical field of optics, and particularly relates to a short-wave infrared telescope objective which is suitable for a wave band of 760 nm-3000 nm, is suitable for a temperature of-40-60 ℃, and has an image space telecentric property; the method can be applied to the fields of nondestructive testing, industrial multispectral imaging analysis, resource remote sensing, infrared astronomy, traffic, medical treatment, public security and the like.
Background
Compared with other wavelength detection, the near infrared and the short wave infrared have the capability of distinguishing details similar to visible light reflection type imaging, have invisible light detection capability, have distinct and irreplaceable imaging advantages, and can be widely applied to the fields of industrial multispectral imaging analysis, resource remote sensing, infrared astronomy, traffic, medical treatment, public security and the like. The near infrared imaging wave band is 760 nm-1000 nm, and the short wave infrared imaging wave band is 1000 nm-2500 nm. The optical system has few available materials in infrared wave bands, and especially for wide wave bands of 760nm to 3000nm, it is particularly difficult to enable the imaging quality to reach a higher level in the whole wave band. The near-infrared and short-wave infrared lens in the prior art mainly has the conditions of poor comprehensive image quality such as insufficient waveband range, large distortion, large chromatic aberration and the like, so that the development of a high-imaging-quality lens suitable for 760nm to 3000nm is very significant.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the wide-band athermal differential image space telecentric system which has a compact structure, high imaging quality and good thermal stability, is beneficial to processing and adjustment and works in a short-wave infrared band.
In order to achieve the purpose, the invention provides a short-wave infrared telescope objective lens which sequentially comprises a first plane window sheet, a second negative meniscus lens, a third positive meniscus lens, a fourth positive biconvex lens, an aperture diaphragm, a fifth positive biconvex lens, a sixth negative meniscus lens, a seventh positive meniscus lens, an eighth negative meniscus lens and a ninth positive biconvex lens along the incident direction of light; the image space chief ray is parallel to the optical axis and vertically incident on the image surface; the focal lengths of the lenses correspond to each other in sequence along the incident direction of the light
、
、
、
、
Their focal lengths with respect to the telescopic objective
Respectively correspond to
0、-3.0
-2.0、27
29、3
4、0.8
1.2、-3.0
-2.0、0.8
1.2、-0.8
-0.3、0.5
1。
Furthermore, the telescope objective is a transmission type optical system, and the structure of the optical system is a coaxial structure; all lenses of the telescopic objective lens are spherical surface type.
Further, the lens material of the telescopic objective lens includes any three of chalcogenide glass, quartz glass, and fluoride.
Further, the method can be used for preparing a novel materialAlong the incident direction of the light rays, the refractive indexes of the lenses are sequentially corresponding to
、
、
、
、
The corresponding value ranges are respectively
、
、2.0
、
、
。
Furthermore, the working wave band of the telescopic objective lens is 760 nm-3000 nm, and the working temperature range is-40 ℃ to 60 ℃.
Further, the maximum field angle of the telescopic objective lens is 36.0 °.
Further, the maximum relative aperture of the telescopic objective lens is F/3.0.
Furthermore, the maximum aperture of a lens in the telescopic objective lens is smaller than 15.0mm, and the maximum aperture of the window glass is smaller than 20.0 mm.
Further, the maximum focal length of the lens in the telescopic objective lens is 15 mm.
Further, the telescope can be suitable for detector resolution 640 x 512 and pixel size 15 μm.
Compared with the prior art, the invention has the advantages that:
1. the working waveband of the telescopic objective lens provided by the invention is 760 nm-3000 nm, the waveband is wide, the image quality diffuse spot radius is less than 4.8 mu m, the distortion is less than 1%, and the MTF is more than 0.725@33.4lp/mm at the full waveband and the temperature of-40-60 ℃;
2. the invention utilizes the athermal design principle, and balances the thermal difference by using chalcogenide glass, quartz series and fluoride, so that the image quality of the system is kept stable at the temperature of-40 to 60 ℃;
3. the telescopic objective lens has the characteristic of telecentric image space, so that the illumination of an image surface is uniform; the field angle of the telescope can reach 36 degrees, the imaging range is enlarged, and more target information can be collected at one time.
Drawings
Fig. 1 is a schematic structural diagram of a short-wave infrared telescope objective lens provided in an embodiment of the present invention;
FIG. 2 is a graph showing a modulation transfer function (cut-off frequency 33.4 lp/mm) of the telescopic objective lens at-40 deg.C according to the embodiment of the present invention;
FIG. 3 is a graph of the modulation transfer function (cut-off frequency 33.4 lp/mm) of the telescopic objective lens provided by the embodiment of the present invention at 20 ℃;
FIG. 4 is a graph showing a modulation transfer function (cut-off frequency 33.4 lp/mm) of the telescopic objective lens provided by the embodiment of the present invention at 60 ℃;
FIG. 5 is a stippled view of a telescope objective lens at-40 deg.C according to an embodiment of the present invention;
FIG. 6 is a schematic view of a telescope objective lens at 20 ℃ according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a telescope provided by an embodiment of the invention at 60 ℃;
fig. 8 is a field curvature distortion diagram of the telescopic objective lens provided in the embodiment of the present invention;
fig. 9 is a diagram of relative illuminance of the telescopic objective lens according to the embodiment of the present invention.
Detailed Description
The invention is further illustrated by the following specific examples in accordance with the accompanying drawings.
Example 1
The embodiment provides a short-wave infrared wide-band athermal image space telecentric telescope objective which is a transmission type optical system, the structure of the telescope objective is a coaxial structure, the objective works in a short-wave infrared band of 760nm to 3000nm, the working temperature range is minus 40 ℃ to 60 ℃, the focal length is 15mm, the F/# is 3.0, the full field of view is 36.0 degrees, the resolution ratio of the telescope objective is 640 multiplied by 512, and the pixel size is 15 mu m.
Referring to fig. 1, which is a schematic diagram of a short-wave infrared telescope objective lens provided in this embodiment, a first planar window sheet 1, a second negative meniscus lens 2, a third positive meniscus lens 3, a fourth positive biconvex lens 4, an aperture stop 5, a fifth positive biconvex lens 6, a sixth negative meniscus lens 7, a seventh positive meniscus lens 8, an eighth negative meniscus lens 9, a ninth positive biconvex lens 10, and an image plane 11 are sequentially arranged along a light incident direction. The image space chief ray is parallel to the optical axis and vertically incident on the image surface; the focal lengths of the lenses correspond to each other along the incident direction of light
、
、
、
、
Their focal lengths with respect to the telescopic objective
Respectively correspond to
0、-3.0
-2.0、27
29、3
4、0.8
1.2、-3.0
-2.0、0.8
1.2、-0.8
-0.3、0.5
1. The refractive index of each lens is sequentially corresponding to
、
、
、
、
The corresponding value ranges are respectively
、
、2.0
、
、
. Preferably, all lenses of the telephoto objective lens are of a spherical surface type. The maximum aperture of the lens is smaller than 15mm, the maximum aperture of the window glass is smaller than 20mm, and the maximum focal length of the lens is 15 mm. More preferably, the lens material of the telephoto objective lens includes any three of chalcogenide glass, quartz glass, and fluoride.
By utilizing the theory of athermal difference and aberration elimination, the infrared optical glass material with higher transmittance is selected, so that the imaging quality is high within a certain temperature range. The diaphragm is arranged on the front focal plane of the rear group of lenses, so that the telescopic objective lens has the characteristic of image space telecentricity, namely, image space light is vertically incident on an image surface, and the uniform illumination of the image surface can be ensured. The first piece of the telescope is window protection glass, and is selected according to actual conditions, and enough space is reserved between the rear surface of the last piece of the telescope objective lens and the image surface for placing a detector. All the lenses are spherical, and the system is concentric and coaxial, so that the processing and manufacturing cost and the detection difficulty are reduced, and the installation and adjustment are easy.
The embodiment provides a preferable scheme for each lens of the short-wave infrared telescope objective, and specific data and adopted materials are shown in table 1.
TABLE 1 optical construction parameters of the lens
Referring to the attached figures 2-4, in the optical system of the embodiment, under the temperature of-40 ℃, 20 ℃ and 60 ℃, the Modulation Transfer Function (MTF) curve is that the size of a detector pixel is 15 mu m multiplied by 15 mu m, the MTF of the system is stable at different temperatures at the Nyquist frequency of 33.4lp/mm, the MTF is greater than 0.725, and the imaging quality is close to the diffraction limit.
Referring to fig. 5-7, in the present embodiment, the optical system traces light at-40 ℃, 20 ℃ and 60 ℃ to obtain a dot arrangement diagram on the image plane, and the circle in the diagram represents the diffraction airy disk of the system. The energy of each field point sequence is concentrated in the range of Airy spots, and the imaging quality is good.
Referring to fig. 8, the field curvature distortion diagram of the optical system of this embodiment has a distortion of less than 1%, and the image is not distorted.
Referring to fig. 9, the contrast curve of the optical system of this embodiment shows that the image plane has uniform relative illumination and the relative illumination value of the edge field is close to 1.
Therefore, the short-wave infrared telescope objective provided by the invention has better imaging quality at-40-60 ℃.
Finally, it should be noted that: the above embodiments are only used for illustrating the present invention patent, and do not limit the technical solutions described in the present invention patent. Thus, while the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will appreciate that modifications may be made to the invention; all such modifications and variations that do not depart from the scope of the invention are intended to be included within the scope of the appended claims.
Claims (10)
1. A short wave infrared telescope objective lens is characterized in that: the device comprises a first plane window sheet (1), a second negative meniscus lens (2), a third positive meniscus lens (3), a fourth positive biconvex lens (4), an aperture diaphragm (5), a fifth positive biconvex lens (6), a sixth negative meniscus lens (7), a seventh positive meniscus lens (8), an eighth negative meniscus lens (9) and a ninth positive biconvex lens (10) in sequence along the incident direction of light; the image space chief ray is parallel to the optical axis and vertically incident on the image surface; the focal lengths of the lenses correspond to each other in sequence along the incident direction of the light
、
、
、
、
Their focal lengths with respect to the telescopic objective
Respectively correspond to
0、-3.0
-2.0、27
29、3
4、0.8
1.2、-3.0
-2.0、0.8
1.2、-0.8
-0.3、0.5
1。
2. The short wave infrared telescopic objective lens of claim 1, characterized in that: the telescope objective is a transmission type optical system, and the structure of the optical system is a coaxial structure; all lenses of the telescopic objective lens are spherical surface type.
3. The short wave infrared telescopic objective lens of claim 1, characterized in that: the lens material of the telescope objective comprises any three of chalcogenide glass, quartz series and fluoride.
4. The short wave infrared telescopic objective lens of claim 1, wherein: the refractive index of each lens along the incident direction of the light ray is sequentially corresponding to
、
、
、
、
The corresponding value ranges are respectively
、
、2.0
、
、
。
5. The short wave infrared telescopic objective lens of claim 1, characterized in that: the working waveband of the telescopic objective lens is 760nm to 3000nm, and the working temperature range is-40 ℃ to 60 ℃.
6. The short wave infrared telescopic objective lens of claim 1, characterized in that: the maximum field angle of the telescopic objective lens is 36.0 degrees.
7. The short wave infrared telescopic objective lens of claim 1, characterized in that: the maximum relative aperture of the telescopic objective lens is F/3.0.
8. The short wave infrared telescopic objective lens of claim 1, characterized in that: the maximum aperture of a lens in the telescopic objective lens is smaller than 15mm, and the maximum aperture of window glass is smaller than 20 mm.
9. The short wave infrared telescopic objective lens of claim 1, wherein: the maximum focal length of the lens in the telescopic objective lens is 15 mm.
10. The short wave infrared telescopic objective lens of claim 1, characterized in that: the telescope can be suitable for detector resolution 640 x 512 and pixel size 15 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210780869.7A CN115097608A (en) | 2022-07-05 | 2022-07-05 | Short wave infrared telescope objective lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210780869.7A CN115097608A (en) | 2022-07-05 | 2022-07-05 | Short wave infrared telescope objective lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115097608A true CN115097608A (en) | 2022-09-23 |
Family
ID=83297437
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210780869.7A Pending CN115097608A (en) | 2022-07-05 | 2022-07-05 | Short wave infrared telescope objective lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115097608A (en) |
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2022
- 2022-07-05 CN CN202210780869.7A patent/CN115097608A/en active Pending
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