CN213399037U - Long-focus large-caliber medium-long wave dual-waveband infrared optical system - Google Patents
Long-focus large-caliber medium-long wave dual-waveband infrared optical system Download PDFInfo
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- CN213399037U CN213399037U CN202022502830.8U CN202022502830U CN213399037U CN 213399037 U CN213399037 U CN 213399037U CN 202022502830 U CN202022502830 U CN 202022502830U CN 213399037 U CN213399037 U CN 213399037U
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Abstract
A long-focus large-caliber medium-long wave two-waveband infrared optical system belongs to the field of infrared remote sensing optical systems and solves the problem that an existing two-waveband infrared imaging system is poor in remote weak target detection effect. The utility model discloses a long focus heavy-calibre medium-long wave dual waveband infrared optical system, from the object space to the image space, the coaxial axis is equipped with diaphragm, first positive meniscus lens, first negative meniscus lens, biconvex lens, second negative meniscus lens, third negative meniscus lens and second positive meniscus lens in proper order; the incident light is converged and imaged on an image surface after being deflected by the first positive meniscus lens, the first negative meniscus lens, the double convex lens, the second negative meniscus lens, the third negative meniscus lens and the second positive meniscus lens in sequence after being limited by the diaphragm. The system realizes longer focal length, larger clear aperture, higher transmittance and higher resolution of the medium-long wave two-waveband infrared optical system by using less lenses and only adopting three optical materials, and is further used for detecting a remote signal image.
Description
Technical Field
The utility model belongs to the technical field of infrared remote sensing optical system, concretely relates to long wave dual waveband infrared optical system in long focus heavy-calibre.
Background
The medium wave band and the long wave band are common bands for military target detection. The medium-long wave dual-waveband infrared imaging system can acquire target information at two wavebands simultaneously, so that the detection rate of a target can be improved. For example, in military applications, if the temperature of the target changes and the target is camouflaged, the information acquired by a single band naturally weakens, and due to the fact that the operation or behavior of the target itself causes the radiation band to move, the target may not be detected by the imaging system or the detection accuracy may be reduced, and even a false signal may be formed. Therefore, it is very important to detect the mid-and long-wavelength spectral radiation in the infrared spectrum simultaneously according to the radiation and radiation characteristics of the target and the background.
Because the simultaneous correction of the aberration of the two wave bands is difficult, the focal length and the light-transmitting caliber of the traditional medium-long wave two wave band infrared imaging system are not large, and the requirement of long-distance weak target scene detection cannot be met. How to obtain a long-focus large-caliber medium-long wave dual-waveband infrared optical system is a problem to be solved urgently.
SUMMERY OF THE UTILITY MODEL
In order to solve the current dual-waveband infrared imaging system to the not good problem of remote weak target detection effect, the utility model provides a long wave dual-waveband infrared optical system in long focus heavy-calibre can regard as remote target identification and tracking means's front end optical assembly.
The utility model discloses a solve the technical scheme that technical problem adopted as follows:
the utility model discloses a long focus heavy-calibre medium-long wave dual waveband infrared optical system, from the object space to the image space, the coaxial axis is equipped with diaphragm, first positive meniscus lens, first negative meniscus lens, biconvex lens, second negative meniscus lens, third negative meniscus lens and second positive meniscus lens in proper order;
the incident light is converged and imaged on an image surface after being deflected by the first positive meniscus lens, the first negative meniscus lens, the double convex lens, the second negative meniscus lens, the third negative meniscus lens and the second positive meniscus lens in sequence after being limited by the diaphragm.
Further, the first positive meniscus lens has a positive focal power, the first negative meniscus lens has a negative focal power, the double convex lens has a positive focal power, the second negative meniscus lens has a negative focal power, the third negative meniscus lens has a negative focal power, and the second positive meniscus lens has a positive focal power.
Further, the first positive meniscus lens, the biconvex lens and the second positive meniscus lens are all made of ZNSE materials.
Further, the first negative meniscus lens and the third negative meniscus lens are both made of ZNS _ BROAD material.
Further, the second negative meniscus lens is made of GERMANIUM material.
Furthermore, the second surface of the first positive meniscus lens and the third negative meniscus lens are both even aspheric surfaces.
Furthermore, the focal length of the optical system is larger than 400mm, the working wave band comprises a medium wave of 3.7-4.8 μm and a long wave of 7.7-9.5 μm, the clear aperture is larger than 250mm, and the full field angle is larger than 6 degrees.
The utility model has the advantages that:
the utility model discloses in, through setting up diaphragm, first positive meniscus lens, first negative meniscus lens, biconvex lens, the negative meniscus lens of second, the negative meniscus lens of third and the positive meniscus lens of second, through using less lens to only adopt three kinds of optical material, realized higher resolution ratio, the utility model discloses system simple structure, the size is little, and the processing degree of difficulty is little, and is with low costs, easily realizes.
The utility model discloses in, the second face of first positive meniscus lens and third negative meniscus lens two sides all are the even aspheric surface, and the correction aberration that can be fine reaches high image quality imaging requirement.
The utility model discloses a long wave dual waveband infrared optical system in long focus heavy-calibre has increased the information volume of acquireing because the operating band broad, can effectively improve the ability that imaging system surveyed and discernment target.
Drawings
Fig. 1 is an optical structure diagram of the long-focus large-caliber medium-long wave dual-waveband infrared optical system of the present invention.
Fig. 2 is a light path diagram of the long-focus large-caliber medium-long wave dual-waveband infrared optical system of the present invention.
FIG. 3 is a graph of MTF (optical modulation transfer function) of a long-focus large-aperture medium-long wave band infrared optical system with 7.7-9.5 um wave bands.
FIG. 4 is a graph of MTF (optical modulation transfer function) of a long-focus large-aperture medium-long wave band infrared optical system with a wavelength of 3.7-4.8 um.
In the figure: 1. the lens comprises a diaphragm, 2, a first positive meniscus lens, 3, a first negative meniscus lens, 4, a double convex lens, 5, a second negative meniscus lens, 6, a third negative meniscus lens, 7, a second positive meniscus lens, 8 and an image plane.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
As shown in fig. 1, the utility model discloses a long wave two-waveband infrared optical system in long focus heavy-calibre has set gradually diaphragm 1, first positive meniscus lens 2, first negative meniscus lens 3, biconvex lens 4, second negative meniscus lens 5, third negative meniscus lens 6 and second positive meniscus lens 7 from the object space to the image space. The first positive meniscus lens 2, the first negative meniscus lens 3, the double convex lens 4, the second negative meniscus lens 5, the third negative meniscus lens 6, and the second positive meniscus lens 7 are disposed on the same optical axis.
As shown in fig. 2, an incident light beam is limited by a diaphragm 1, and then is deflected by a first positive meniscus lens 2, a first negative meniscus lens 3, a double convex lens 4, a second negative meniscus lens 5, a third negative meniscus lens 6 and a second positive meniscus lens 7 in sequence, and then is focused and imaged on an image surface 8.
In the present embodiment, the first positive meniscus lens 2 has a positive refractive power, the first negative meniscus lens 3 has a negative refractive power, the double convex lens 4 has a positive refractive power, the second negative meniscus lens 5 has a negative refractive power, the third negative meniscus lens 6 has a negative refractive power, and the second positive meniscus lens 7 has a positive refractive power.
In the present embodiment, the first positive meniscus lens 2, the biconvex lens 4, and the second positive meniscus lens 7 are all made of ZNSE material.
In the present embodiment, the first negative meniscus lens 3 and the third negative meniscus lens 6 are both made of a ZNS _ BROAD material.
In the present embodiment, the second negative meniscus lens 5 is made of GERMANIUM material.
In this embodiment, the second surface 202 of the first positive meniscus lens 2 and the two surfaces (the first surface 601 and the second surface 602) of the third negative meniscus lens 6 are both even aspheric surfaces, and this design can correct the aberration well and achieve the requirement of high image quality imaging. The utility model discloses a long wave dual waveband infrared optical system in long focus heavy-calibre not only the lens is few, the size is little, simple structure, and the bore is big moreover, has realized higher resolution ratio.
The utility model discloses an infrared optical system of long wave dual waveband in long focus heavy-calibre, focus are greater than 400mm, and the working wave band includes well ripples 3.7-4.8 mu m and long wave 7.7-9.5 mu m, and the light aperture that leads to is greater than 250mm, and the full field angle is greater than 6. The long-focus large-caliber medium-long wave dual-band infrared optical system has the focal length of 500mm, the field angle of 8 degrees, the working F number of 1.7, the wave bands of 3.7-4.8 μm of medium wave and 7.7-9.5 μm of long wave, and the total length of the system of 691 mm.
In the long-focus large-aperture medium-and-long-wave two-waveband infrared optical system of the present embodiment, the surface types, the curvature radii, the thicknesses, the refractive indexes, the abbe constants, and other relevant parameters of each surface of all the lenses from the object side (OBJ) to the image side (IMA) are shown in table 1.
TABLE 1
In table 1, STO corresponds to stop 1, STO (201) and 202 correspond to first and second surfaces of the first positive meniscus lens 2, 301 and 302 correspond to first and second surfaces of the first negative meniscus lens 3, 401 and 402 correspond to first and second surfaces of the double convex lens 4, 501 and 502 correspond to first and second surfaces of the second negative meniscus lens 5, 601 and 602 correspond to first and second surfaces of the third negative meniscus lens 6, 701 and 702 correspond to first and second surfaces of the second positive meniscus lens 7, and IMA image plane 8.
And simultaneously, the utility model provides an even aspheric surface mirror surface formula satisfies:
in the formula: h represents the Y-axis coordinate value of each point on the lens surface; c is the reciprocal of the radius of curvature r of the lens surface; k is the conic coefficient, a1、a2、a3、a4、a5、a6High-order aspheric surface coefficients; z is a distance vector height from the aspheric surface vertex at a position having a height h in the optical axis direction of the aspheric surface.
The aspherical surface coefficients of the respective mirror surfaces in the examples are shown in table 2.
TABLE 2
In table 2, E represents scientific notation, STO corresponds to stop 1, STO (201) and 202 correspond to the first and second faces of the first positive meniscus lens 2, 301 and 302 correspond to the first and second faces of the first negative meniscus lens 3, 401 and 402 correspond to the first and second faces of the double convex lens 4, 501 and 502 correspond to the first and second faces of the second negative meniscus lens 5, 601 and 602 correspond to the first and second faces of the third negative meniscus lens 6, 701 and 702 correspond to the first and second faces of the second positive meniscus lens 7, and IMA image side, i.e., image plane 8.
As shown in fig. 3 and 4, fig. 3 is a graph of MTF (optical modulation transfer function) of a long-focus large-caliber medium-long wave band infrared optical system with 7.7 to 9.5 μm wave band; FIG. 4 is a graph of MTF (optical modulation transfer function) of a long-focus large-aperture medium-long wave band infrared optical system with a wavelength of 3.7-4.8 μm. Wherein the OTF modulus on the ordinate represents the MTF and the spatial frequency on the abscissa represents the resolution in cycles per millimeter. Can reflect through fig. 3 and fig. 4 the utility model discloses a long wave dual waveband infrared optical system's imaging quality in long focus heavy-calibre, locate MTF at 21 cycle/mm and be greater than 0.5, it is better to show long focus heavy-calibre dual waveband infrared optical system's imaging quality.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the scope of the present invention.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: it is to be understood that modifications may be made to the above-described arrangements in the embodiments or equivalents may be substituted for some of the features of the embodiments, but such modifications or substitutions do not depart from the spirit and scope of the present invention.
Claims (7)
1. The long-focus large-caliber medium-long wave two-waveband infrared optical system is characterized in that a diaphragm, a first positive meniscus lens, a first negative meniscus lens, a double convex lens, a second negative meniscus lens, a third negative meniscus lens and a second positive meniscus lens are sequentially arranged from an object space to an image space on the same optical axis;
the incident light is converged and imaged on an image surface after being deflected by the first positive meniscus lens, the first negative meniscus lens, the double convex lens, the second negative meniscus lens, the third negative meniscus lens and the second positive meniscus lens in sequence after being limited by the diaphragm.
2. The long focus large caliber medium wavelength band two wavelength infrared optical system of claim 1 wherein the first positive meniscus lens has a positive power, the first negative meniscus lens has a negative power, the double convex lens has a positive power, the second negative meniscus lens has a negative power, the third negative meniscus lens has a negative power, the second positive meniscus lens has a positive power.
3. The long focus large aperture medium and long wave dual band infrared optical system of claim 1, wherein the first positive meniscus lens, the biconvex lens and the second positive meniscus lens are made of ZNSE material.
4. The long focus large aperture medium to long wave dual band infrared optical system of claim 1, wherein the first negative meniscus lens and the third negative meniscus lens are made of a ZNS _ BROAD material.
5. The long focus large aperture medium to long wave dual band infrared optical system of claim 1 wherein the second negative meniscus lens is made of germinium material.
6. The long-focus large-aperture medium-and-long-wave dual-band infrared optical system of claim 1, wherein both the second surface of the first positive meniscus lens and the third negative meniscus lens are even aspheric surfaces.
7. The long focus large aperture medium and long wave dual band infrared optical system of claim 1, wherein the focal length of the optical system is larger than 400mm, the working band includes medium wave 3.7-4.8 μm and long wave 7.7-9.5 μm, the clear aperture is larger than 250mm, and the full field angle is larger than 6 °.
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| CN202022502830.8U CN213399037U (en) | 2020-11-03 | 2020-11-03 | Long-focus large-caliber medium-long wave dual-waveband infrared optical system |
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| CN202022502830.8U CN213399037U (en) | 2020-11-03 | 2020-11-03 | Long-focus large-caliber medium-long wave dual-waveband infrared optical system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113933976A (en) * | 2021-10-25 | 2022-01-14 | 季华实验室 | Long-focus dual-waveband infrared optical system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113933976A (en) * | 2021-10-25 | 2022-01-14 | 季华实验室 | Long-focus dual-waveband infrared optical system |
| CN113933976B (en) * | 2021-10-25 | 2023-07-25 | 季华实验室 | Long-focus dual-band infrared optical system |
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