CN217846761U - Short wave infrared telescope objective lens - Google Patents

Short wave infrared telescope objective lens Download PDF

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CN217846761U
CN217846761U CN202221705066.7U CN202221705066U CN217846761U CN 217846761 U CN217846761 U CN 217846761U CN 202221705066 U CN202221705066 U CN 202221705066U CN 217846761 U CN217846761 U CN 217846761U
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lens
objective lens
wave infrared
short wave
telescopic objective
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蔡福鑫
姚明亮
鲁金超
顾姗姗
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Nantong Academy of Intelligent Sensing
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Nantong Academy of Intelligent Sensing
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Abstract

The utility model discloses an infrared telescope objective of shortwave, for coaxial transmission-type optical system, operating band is 760nm ~3000nm, including a window glass and eight spherical lens. The lens 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 in sequence along the incident direction of light rays. The utility model is suitable for infrared band width of 760nm to 3000nm; 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 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

Short wave infrared telescope objective lens
Technical Field
The utility model belongs to the technical field of optics, in particular to a short wave infrared telescope objective which is suitable for a wave band of 760nm to 3000nm, has an applicable temperature of-40 to 60 ℃ and has the telecentric property of an image space; 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 760nm to 1000nm, and the short wave infrared imaging wave band is 1000nm to 2500nm. The optical system has few available materials in the infrared band, and especially has difficulty in reaching a high level of imaging quality in the whole band for a wide band of 760nm to 3000 nm. 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 760 nm-3000 nm is very significant.
Disclosure of Invention
The utility model provides a compact structure to the not enough of prior art existence, imaging quality is high, and thermal stability is good, does benefit to processing and adjusts, and works in the broadband of the infrared band of shortwave poor image space telecentric systems that disappears.
In order to achieve the object, the utility model provides a short wave infrared telescope objective lens, along the light incidence direction, be first plane window piece, second negative meniscus lens, third positive meniscus lens, fourth positive biconvex lens, aperture diaphragm, fifth positive biconvex lens, sixth negative meniscus lens, seventh positive meniscus lens, eighth negative meniscus lens, ninth positive biconvex lens in proper order; 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
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、
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、
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、
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、
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Their focal lengths with respect to the telescopic objective
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Normalized values of respectively corresponding to
Figure DEST_PATH_IMAGE014
0、-3.0
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-2.0、27
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29、3
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4、0.8
Figure DEST_PATH_IMAGE022
1.2、-3.0
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-2.0、0.8
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1.2、-0.8
Figure DEST_PATH_IMAGE028
-0.3、0.5
Figure DEST_PATH_IMAGE030
1。
Furthermore, the telescopic objective lens 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, along the incident direction of the light rays, the refractive indexes of the lenses are sequentially corresponding to
Figure DEST_PATH_IMAGE032
、
Figure DEST_PATH_IMAGE034
、
Figure DEST_PATH_IMAGE036
、
Figure DEST_PATH_IMAGE038
、
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The corresponding value ranges are respectively
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、
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、2.0
Figure DEST_PATH_IMAGE046
、
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、
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。
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 20.0mm.
Further, the maximum focal length of the lens in the telescopic objective lens is 15mm.
Further, the telescope can be suitable for detector resolution 640 x 512 and pixel size 15 μm.
Compared with the prior art, the utility model discloses the advantage lies in:
1. the working wave band of the telescope objective provided by the utility model is 760nm to 3000nm, the wave band is wider, the image quality diffuse spot radius is less than 4.8 μm, the distortion is less than 1%, and the MTF is more than 0.725@33.4lp/mm under the full wave band and the temperature of minus 40 to 60 ℃;
2. the utility model utilizes the athermal design principle, and balances the heat difference by using chalcogenide glass, quartz series and fluoride, so that the image quality of the system is kept stable within-40 to 60 ℃;
3. the utility model discloses well telescope objective has the image space telecentric characteristic, has guaranteed that image plane illumination is even; 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 view of a short-wave infrared telescope objective lens provided by an embodiment of the present invention;
fig. 2 is a modulation transfer function curve diagram (cut-off frequency 33.4 lp/mm) of the telescope objective lens at-40 ℃ according to the embodiment of the present invention;
fig. 3 is a modulation transfer function curve diagram (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 modulation transfer function curve diagram (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 dot-column diagram of the telescope objective lens at-40 ℃ according to the embodiment of the present invention;
fig. 6 is a dot-column diagram of the telescope objective lens provided by the embodiment of the present invention at 20 ℃;
FIG. 7 is a schematic diagram of a telescope provided by an embodiment of the present 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 relative illuminance diagram of the telescopic objective lens according to an embodiment of the present invention.
Detailed Description
The invention will be further explained by means of specific embodiments with reference to the 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 optical system is a coaxial structure, the objective works in short-wave infrared bands of 760nm to 3000nm, the working temperature range is-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, the schematic diagram of the short-wave infrared telescopic objective lens provided in this embodiment sequentially includes, along a light incident direction, 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. The image space chief ray is parallel to the optical axis and vertically incident on the image surface; the focal lengths of the lenses are sequentially corresponding along the incident direction of light rays
Figure DEST_PATH_IMAGE051
、
Figure 389582DEST_PATH_IMAGE004
、
Figure 350584DEST_PATH_IMAGE006
、
Figure DEST_PATH_IMAGE052
、
Figure 762849DEST_PATH_IMAGE010
Their focal lengths with respect to the telescopic objective lens
Figure 241235DEST_PATH_IMAGE012
Normalized values of respectively corresponding to
Figure 291230DEST_PATH_IMAGE014
0、-3.0
Figure 157555DEST_PATH_IMAGE016
-2.0、27
Figure 27422DEST_PATH_IMAGE018
29、3
Figure 637395DEST_PATH_IMAGE020
4、0.8
Figure 40432DEST_PATH_IMAGE022
1.2、-3.0
Figure 15342DEST_PATH_IMAGE024
-2.0、0.8
Figure 497139DEST_PATH_IMAGE026
1.2、-0.8
Figure 520589DEST_PATH_IMAGE028
-0.3、0.5
Figure 404232DEST_PATH_IMAGE030
1. The refractive index of each lens is sequentially corresponding to
Figure DEST_PATH_IMAGE054
、
Figure DEST_PATH_IMAGE056
、
Figure DEST_PATH_IMAGE058
、
Figure DEST_PATH_IMAGE060
、
Figure DEST_PATH_IMAGE062
The corresponding value ranges are respectively
Figure DEST_PATH_IMAGE064
、
Figure DEST_PATH_IMAGE066
、2.0
Figure DEST_PATH_IMAGE068
、
Figure DEST_PATH_IMAGE070
、
Figure DEST_PATH_IMAGE072
. Preferably, all lenses of the telescopic objective lens are of spherical surface type. Wherein 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 15mm. More preferably, the lens material of the telescopic 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 lens, and specific data and adopted materials are shown in table 1.
TABLE 1 optical construction parameters of the lens
Figure DEST_PATH_IMAGE074
Referring to the attached drawing 2~4, in the optical system of the embodiment, the Modulation Transfer Function (MTF) curve is at-40 ℃, 20 ℃ and 60 ℃, the size of a detector pixel is 15 microns multiplied by 15 microns, at the Nyquist frequency of 33.4lp/mm, the MTF of the system is stable at different temperatures and is larger than 0.725, and the imaging quality is close to the diffraction limit.
Referring to FIG. 5~7, the light ray traces at-40 deg.C, 20 deg.C and 60 deg.C of the optical system of this example to obtain a dot-column diagram on the image plane, and the circle in the diagram represents the diffraction Airy spot 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 lens provided by the utility model has better imaging quality at-40 ℃ -60 ℃.
Finally, it should be noted that: the above embodiments are only used for illustrating the present invention, and do not limit the technical solutions described in the present invention. Thus, although 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 technical solutions and modifications which do not depart from the scope of the present invention should be covered by the scope of the claims of the present invention.

Claims (10)

1. A short wave infrared telescope objective lens is characterized in that: along the incident direction of light rays, a first plane window sheet (1), a second negative meniscus lens (2), a third positive meniscus lens (3), a fourth positive double convex lens (4), an aperture diaphragm (5), a fifth positive double convex 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); 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
Figure DEST_PATH_175501DEST_PATH_IMAGE001
、
Figure DEST_PATH_808607DEST_PATH_IMAGE002
、
Figure DEST_PATH_502763DEST_PATH_IMAGE003
、
Figure DEST_PATH_246728DEST_PATH_IMAGE004
、
Figure DEST_PATH_359040DEST_PATH_IMAGE005
Their focal lengths with respect to the telescopic objective
Figure DEST_PATH_412316DEST_PATH_IMAGE006
Normalized values of respectively corresponding to
Figure DEST_PATH_344500DEST_PATH_IMAGE007
0、-3.0
Figure DEST_PATH_626577DEST_PATH_IMAGE008
-2.0、27
Figure DEST_PATH_842663DEST_PATH_IMAGE009
29、3
Figure DEST_PATH_817572DEST_PATH_IMAGE010
4、0.8
Figure DEST_PATH_237053DEST_PATH_IMAGE011
1.2、-3.0
Figure DEST_PATH_588399DEST_PATH_IMAGE012
-2.0、0.8
Figure DEST_PATH_658992DEST_PATH_IMAGE013
1.2、-0.8
Figure DEST_PATH_804803DEST_PATH_IMAGE014
-0.3、0.5
Figure DEST_PATH_711579DEST_PATH_IMAGE015
1。
2. The short wave infrared telescopic objective lens of claim 1, wherein: 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, characterized in that: the refractive index of each lens along the incident direction of the light ray is sequentially corresponding to
Figure DEST_PATH_584726DEST_PATH_IMAGE016
、
Figure DEST_PATH_526137DEST_PATH_IMAGE017
、
Figure DEST_PATH_108428DEST_PATH_IMAGE018
、
Figure DEST_PATH_486189DEST_PATH_IMAGE019
、
Figure DEST_PATH_179338DEST_PATH_IMAGE020
The corresponding value ranges are respectively
Figure DEST_PATH_709677DEST_PATH_IMAGE021
、
Figure DEST_PATH_462869DEST_PATH_IMAGE022
、2.0
Figure DEST_PATH_327926DEST_PATH_IMAGE023
、
Figure DEST_PATH_824766DEST_PATH_IMAGE024
、
Figure DEST_PATH_475191DEST_PATH_IMAGE025
。
5. The short wave infrared telescopic objective lens of claim 1, characterized in that: the working waveband of the telescopic objective lens is 760 nm-3000 nm, 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 20mm.
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 15mm.
10. The short wave infrared telescopic objective lens of claim 1, wherein: the telescopic objective lens can be suitable for the detector resolution of 640 multiplied by 512 and the pixel size of 15 mu m.
CN202221705066.7U 2022-07-05 2022-07-05 Short wave infrared telescope objective lens Active CN217846761U (en)

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