CN106842525B - Solar blind ultraviolet band large-target-surface double-focal-length lens optical system and imaging method thereof - Google Patents
Solar blind ultraviolet band large-target-surface double-focal-length lens optical system and imaging method thereof Download PDFInfo
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- CN106842525B CN106842525B CN201710254434.8A CN201710254434A CN106842525B CN 106842525 B CN106842525 B CN 106842525B CN 201710254434 A CN201710254434 A CN 201710254434A CN 106842525 B CN106842525 B CN 106842525B
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- G—PHYSICS
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- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/15—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective compensation by means of only one movement or by means of only linearly related movements, e.g. optical compensation
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Abstract
The invention relates to a solar blind ultraviolet band large-target-surface bifocal lens optical system and an imaging method thereof, wherein the solar blind ultraviolet band large-target-surface bifocal lens optical system is of a two-component zooming transmission type structure, and a zoom group, a diaphragm, a compensation group, a solar blind ultraviolet band-pass filter and a solar blind ultraviolet CCD are coaxially arranged in sequence from an object direction to an image direction along axial light incidence from left to right; the zoom group is sequentially provided with a first biconvex lens A1 with positive focal power, a first crescent lens A2 with positive focal power, a first biconcave lens A3 with negative focal power, a second crescent lens A4 with positive focal power and a second biconvex lens A5 with positive focal power from left to right; the compensation group is sequentially provided with a double convex lens C1 with a third positive focal power, a double concave lens C2 with a second negative focal power, a crescent lens C3 with a first negative focal power and a double convex lens C4 with a fourth positive focal power from left to right. The invention can realize the switching of the double focal length and the double view field by using one lens on the premise of not increasing the number of the lenses, the whole system only has two components, the structure is simple, and the imaging quality is excellent.
Description
Technical Field
The invention relates to the technical field of optics, in particular to an imaging method based on a solar blind ultraviolet band large-target-surface dual-focal-length lens optical system.
Background
The 240nm-280nm band is a very specific spectrum invisible to the naked eye and belongs to the ultraviolet band, and is called as a "solar blind area" (namely "solar blind"). When the spectrum emitted by the sun enters the atmosphere, the ultraviolet radiation in this band is totally absorbed by the ozone layer. The greatest interference during the measurement, interference from solar uv radiation, is thus already excluded. The solar blind ultraviolet detection technology makes full use of the characteristic, can sensitively detect weak ultraviolet signals generated by electric sparks at fault points of a high-voltage line, has good working background, small interference, good signal contrast and few false signals, and can perform all-weather clear detection imaging and real-time monitoring. The solar blind ultraviolet lens can be used for remotely and comprehensively monitoring potential safety hazards of transformer substations, forests and the like in real time by erecting a cradle head or installing the solar blind ultraviolet lens on an unmanned aircraft; flow monitoring can also be performed onboard.
The existing solar blind ultraviolet lens is monitored by a single focal length and a single view field, and if two view fields need to be monitored, two lenses need to be used.
Disclosure of Invention
In view of the above, the present invention provides an imaging method based on a solar-blind ultraviolet band large-target-surface dual-focal-length lens optical system, which can realize the switching of dual-focal-length dual-field of view by using one lens without increasing the number of lenses, and the whole system is only two components, and has a simple structure and excellent imaging quality.
The invention is realized by adopting the following scheme: a solar blind ultraviolet band large-target-surface double-focal-length lens optical system is of a two-component zooming transmission type structure, and a zoom group, a diaphragm, a compensation group, a solar blind ultraviolet band-pass filter and a solar blind ultraviolet CCD are coaxially arranged in sequence from the object direction to the image direction along axial light incidence from left to right; the zoom group is sequentially provided with a first biconvex lens A1 with positive focal power, a first crescent lens A2 with positive focal power, a first biconcave lens A3 with negative focal power, a second crescent lens A4 with positive focal power and a second biconvex lens A5 with positive focal power from left to right; the compensation group is sequentially provided with a double convex lens C1 with a third positive focal power, a double concave lens C2 with a second negative focal power, a crescent lens C3 with a first negative focal power and a double convex lens C4 with a fourth positive focal power from left to right.
Preferably, the diaphragm is arranged between the zoom group and the compensation group to form a double-Gaussian deformation structure, so that off-axis aberrations are mutually offset to a large extent. The position between the diaphragm and the solar blind ultraviolet CCD is fixed, and the focal length is changed by moving the zoom group and the compensation group.
Further, the refractive indexes of the materials of the first negative-power biconcave lens A3, the second negative-power biconcave lens C2 and the first negative-power crescent lens C3 are in the range of 1.40-1.50, and the Abbe number is in the range of 65-70; the refractive index ranges of the materials of the first positive focal power double-convex lens A1, the first positive focal power crescent lens A2, the second positive focal power crescent lens A4, the second positive focal power double-convex lens A5, the third positive focal power double-convex lens C1 and the fourth positive focal power double-convex lens C4 are 1.40-1.45, and the Abbe number ranges from 90-95.
Further, the focal length of the first positive-power biconvex lens a1 is 132.7mm, the focal length of the first positive-power crescent lens a2 is 277.1mm, the focal length of the first negative-power biconcave lens A3 is-49.2 mm, the focal length of the second positive-power crescent lens a4 is 130.1mm, and the focal length of the second positive-power biconvex lens a5 is 163.2 mm; the focal length of the third positive-focal-power double-convex lens C1 is 51.6mm, the focal length of the second negative-focal-power double-concave lens C2 is-23.44 mm, the focal length of the first negative-focal-power crescent lens C3 is-64.21 mm, and the focal length of the fourth positive-focal-power double-convex lens C4 is 27.08 mm.
Further, the focal length of the zoom group is 197.8mm, and the focal length of the compensation group is 108.3 mm.
Further, a substrate of the solar-blind ultraviolet band-pass filter is plated with a band-pass filter film which has the central wavelength of 260nm, the spectral range of 240-280nm, high transmittance and the depth cutoff of the rest of spectra; the surfaces of the first positive-power biconvex lens A1, the first positive-power crescent lens A2, the first negative-power biconcave lens A3, the second positive-power crescent lens A4, the second positive-power biconvex lens A5, the third positive-power biconvex lens C1, the second negative-power biconcave lens C2, the first negative-power crescent lens C3 and the fourth positive-power biconvex lens C4 are respectively plated with antireflection films with the central wavelength of 260nm and the spectral range of 240-280 nm.
In particular, the technical indexes of the solar blind ultraviolet band large-target-surface bifocal lens optical system are as follows:
center wavelength: 260nm, spectral range: 240nm-280 nm;
effective relative pore size: 1: 3.5;
focal length: 91mm, 165 mm;
solar blind ultraviolet CCD size: phi is 18 mm;
solar blind ultraviolet CCD pixel diameter: phi 25 microns;
20lp/mm (line pair/mm), the MTF (modulation transfer function) of the whole field of view is more than or equal to 0.65;
the root-mean-square diameter of the diffuse spots in the full field is less than 20 microns and less than the diameter of the pixels.
The invention also provides an imaging method based on the solar blind ultraviolet band large-target-surface double-focal-length lens optical system, the position between the diaphragm and the solar blind ultraviolet CCD is fixed, the air interval between the zoom group and the diaphragm is variable from 0.85mm to 66mm, the air interval between the diaphragm and the compensation group is variable from 1.5mm to 41.9mm, the air interval between the solar blind ultraviolet band-pass filter and the solar blind ultraviolet CCD is variable from 46.1mm to 5.7mm, and the focal length of 91mm to 165mm is obtained by adjusting the variable interval.
Further, the air space between the zooming group and the diaphragm is 0.85mm, the air space between the diaphragm and the compensation group is 1.5mm, and the air space between the solar blind ultraviolet band-pass filter and the solar blind ultraviolet CCD is 46.1mm, so that the focal length of 91mm is obtained.
Further, the air space between the zooming group and the diaphragm is set to be 66mm, the air space between the diaphragm and the compensation group is set to be 41.9mm, and the air space between the solar blind ultraviolet band-pass filter and the solar blind ultraviolet CCD is set to be 5.7mm, so that the focal length of 165mm is obtained.
Compared with the prior art, the invention has the following beneficial effects: the invention can realize the switching of the double focal length and the double view field by using one lens on the premise of not increasing the number of the lenses, the whole system only has two components, the structure is simple, and the imaging quality is excellent.
Drawings
Fig. 1 is a schematic structural diagram of a system according to an embodiment of the present invention.
FIG. 2 is a diagram of an optical system with a 91mm focal length in an embodiment of the present invention;
FIG. 3 is a diagram of a 165mm focal length optical system in an embodiment of the invention;
FIG. 4 is a diagram illustrating evaluation of transfer functions of image plane positions with a focal length of 91mm in the embodiment of the present invention;
FIG. 5 is a diagram illustrating an evaluation of a transfer function of an image plane position with a focal length of 165mm according to an embodiment of the present invention;
FIG. 6 is a diagram illustrating a distribution of the diffuse speckle patterns at image plane positions with a focal length of 91mm according to an embodiment of the present invention;
fig. 7 is a diagram showing a distribution of the diffuse speckles at image plane positions with 165mm focal length in the embodiment of the present invention.
Detailed Description
The invention is further explained by the following embodiments in conjunction with the drawings.
As shown in fig. 1, the present embodiment provides a solar-blind ultraviolet band large-target-surface dual-focal-length lens optical system, which is a two-component zoom transmission type structure, and a zoom group, a diaphragm, a compensation group, a solar-blind ultraviolet band-pass filter, and a solar-blind ultraviolet CCD are coaxially arranged in sequence from an object direction to an image direction along axial light incidence from left to right; the zoom group is sequentially provided with a first biconvex lens A1 with positive focal power, a first crescent lens A2 with positive focal power, a first biconcave lens A3 with negative focal power, a second crescent lens A4 with positive focal power and a second biconvex lens A5 with positive focal power from left to right; the compensation group is sequentially provided with a double convex lens C1 with a third positive focal power, a double concave lens C2 with a second negative focal power, a crescent lens C3 with a first negative focal power and a double convex lens C4 with a fourth positive focal power from left to right.
The focal length of a zoom group consisting of a first positive-focal-power biconvex lens A1, a first positive-focal-power crescent lens A2, a first negative-focal-power biconcave lens A3, a second positive-focal-power crescent lens A4 and a second positive-focal-power biconvex lens A5 is 197.8mm, and the focal length of a compensation group consisting of a third positive-focal-power biconvex lens C1, a second negative-focal-power biconcave lens C2, a first negative-focal-power crescent lens C3 and a fourth positive-focal-power biconvex lens C4 is 108.3 mm.
In this embodiment, the diaphragm is located between the magnification-varying group and the compensation group.
In this embodiment, the focal length of the first positive-power biconvex lens a1 is 132.7mm, the focal length of the first positive-power crescent lens a2 is 277.1mm, the focal length of the first negative-power biconcave lens A3 is-49.2 mm, the focal length of the second positive-power crescent lens a4 is 130.1mm, and the focal length of the second positive-power biconvex lens a5 is 163.2 mm. The focal length of the third positive-focal-power double-convex lens C1 is 51.6mm, the focal length of the second negative-focal-power double-concave lens C2 is-23.44 mm, the focal length of the first negative-focal-power crescent lens C3 is-64.21 mm, and the focal length of the fourth positive-focal-power double-convex lens C4 is 27.08 mm.
In the present embodiment, the center thickness of the first positive-power biconvex lens a1 in the variable power group was 14.96mm, the center thickness of the first positive-power crescent lens a2 was 15.64mm, the center thickness of the first negative-power biconcave lens A3 was 4.5mm, the center thickness of the second positive-power crescent lens a4 was 10.91mm, and the center thickness of the second positive-power biconvex lens a5 was 6 mm. The center thickness of the third positive-power double-convex lens C1 in the compensation group is 6.37mm, the center thickness of the second negative-power double-concave lens C2 in the compensation group is 5mm, the center thickness of the first negative-power crescent lens C3 in the compensation group is 3mm, and the center thickness of the fourth positive-power double-convex lens C4 in the compensation group is 7.64 mm.
In the present embodiment, the air space between the first positive-power biconvex lens a1 and the first positive-power crescent lens a2 in the power varying group is 3.05mm, the air space between the first positive-power crescent lens a2 and the first negative-power biconcave lens A3 is 4.11mm, the air space between the first negative-power biconcave lens A3 and the second positive-power crescent lens a4 is 2.13mm, and the air space between the second positive-power crescent lens a4 and the second positive-power biconvex lens a5 is 20.28 mm.
In the present embodiment, the air space between the third positive-power biconvex lens C1 and the second negative-power biconcave lens C2 in the compensation group is 8.46mm, the air space between the second negative-power biconcave lens C2 and the first negative-power crescent lens C3 is 1.85mm, the air space between the first negative-power crescent lens C3 and the fourth positive-power biconvex lens C4 is 1.53mm, and the air space between the compensation group C and the solar-blind ultraviolet band-pass filter D is 1 mm.
In the present embodiment, the refractive indices of the first negative-power biconcave lens a3, the second negative-power biconcave lens C2, and the first negative-power crescent lens C3 are 1.458, and the abbe number is 67.8; the refractive index of the first positive focal power biconvex lens A1, the first positive focal power crescent lens A2, the second positive focal power crescent lens A4, the second positive focal power biconvex lens A5, the third positive focal power biconvex lens C1 and the fourth positive focal power biconvex lens C4 is 1.434, the Abbe number is 95, the refractive index of the substrate of the solar blind ultraviolet band-pass filter D is 1.458, and the Abbe number is 67.8.
In the present embodiment, the radius of curvature of the first positive-power biconvex lens a1 in the variable power group a is 79.96mm and 251.79mm respectively, the radius of curvature of the first positive-power crescent lens a2 is 155.56mm and 72.63mm respectively, the radius of curvature of the first negative-power biconcave lens A3 is 64.47mm and 41.08mm respectively, the radius of curvature of the second positive-power crescent lens a4 is 42.2mm and 128.94mm respectively, and the radius of curvature of the second positive-power biconvex lens a5 is 185.09mm and 126.79mm respectively. The radius of curvature of the third positive-power biconvex lens C1 is 35.35mm and 70mm respectively, the radius of curvature of the second negative-power biconcave lens C2 is 24.36mm and 24.36mm respectively, the radius of curvature of the first negative-power crescent lens C3 is 203.38mm and 27.7mm respectively, and the radius of curvature of the fourth positive-power biconvex lens C4 is 30.57mm and 19.64mm respectively.
In this embodiment, the air space between the magnification-varying group a and the diaphragm B is 0.85mm, the air space between the diaphragm B and the compensation group C is 1.5mm, and the air space between the solar-blind ultraviolet band-pass filter D and the solar-blind ultraviolet CCD is 46.1mm, so as to obtain a focal length of 91mm, and an optical system diagram thereof is shown in fig. 2. The air interval between the zoom group A and the diaphragm B is 66mm, the air interval between the diaphragm B and the compensation group C is 41.9mm, the air interval between the solar blind ultraviolet band-pass filter D and the solar blind ultraviolet CCD is 5.7mm, a focal length of 165mm is obtained, and an optical system diagram is shown in FIG. 3.
In this embodiment, the ultraviolet bandpass filter in this embodiment must be processed by vacuum optical coating, the substrate thickness is 3mm, and the bandpass filter with center transmission wavelength of 260nm, high transmission spectral range of 240-; antireflection films with the center wavelength of 260nm and the spectral range of 240-280nm are plated on the surfaces of the lenses A1-A5 and C1-C4.
In the present embodiment, in order to make the effective relative aperture 1: 3.5, clear apertures of front and back surfaces of the lens A1 are respectively 55mm and 53mm, clear apertures of front and back surfaces of the lens A2 are respectively 51.8mm and 48.9mm, clear apertures of front and back surfaces of the lens A3 are respectively 46mm and 43.6mm, clear apertures of front and back surfaces of the lens A4 are respectively 44.5mm and 43.6mm, clear apertures of front and back surfaces of the lens A5 are respectively 42.8mm and 42.5mm, clear apertures of front and back surfaces of the lens C1 are respectively 21.56mm and 20.8mm, clear apertures of front and back surfaces of the lens C2 are respectively 18mm and 18.6mm, clear apertures of front and back surfaces of the lens C3 are respectively 18.7mm and 20.3mm, and clear apertures of front and back surfaces of the lens C4 are respectively 22.2mm and 22.9 mm.
In this embodiment, the technical indexes of the optical system of the solar-blind ultraviolet band large-target-surface bifocal lens are as follows:
center wavelength: 260nm, spectral range: 240nm-280 nm;
effective relative pore size: 1: 3.5;
focal length: 91mm, 165 mm;
ultraviolet CCD size: phi is 18 mm;
the diameter of an ultraviolet CCD pixel is as follows: phi 25 microns;
20lp/mm (line pair/mm), the MTF (modulation transfer function) of the whole field of view is more than or equal to 0.65;
the root-mean-square diameter of the diffuse spots in the full field is less than 20 microns and less than the diameter of the pixels.
FIG. 4 shows that the full-field MTF (modulation transfer function) is equal to or greater than 0.65 at 20lp/mm (line pair/mm) when the focal length of the present embodiment is 91 mm; FIG. 5 shows that the full-field MTF (modulation transfer function) of the present invention is greater than or equal to 0.7 at a focal length of 165mm, which is much higher than the MTF requirement of the device.
Fig. 6 is a distribution diagram of the diffuse speckles on the image plane with a focal length of 91mm in the embodiment, where the root-mean-square diameter of the diffuse speckles in the full field is less than 19.5 micrometers, and is less than the pixel diameter (25 micrometers) of the ultraviolet CCD, and the imaging quality is good; fig. 7 is a scattered-spot distribution diagram on the image plane with the focal length of 165mm in the present embodiment, and the full-field scattered-spot root-mean-square diameter is less than 19 micrometers, less than the pixel diameter (25 micrometers) of the ultraviolet CCD, and good in imaging quality.
The above description is only a preferred embodiment of the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the scope of the present invention.
Claims (7)
1. The utility model provides a big target surface bifocal lens optical system of solar blind ultraviolet band which characterized in that: the two-component zoom transmission type structure is formed by coaxially arranging a zoom group, a diaphragm, a compensation group, a solar blind ultraviolet band-pass filter and a solar blind ultraviolet CCD (charge coupled device) in sequence from left to right incidence of axial rays from an object direction to an image direction; the zoom group consists of a first biconvex lens A1 with positive focal power, a first crescent lens A2 with positive focal power, a first biconcave lens A3 with negative focal power, a second crescent lens A4 with positive focal power and a second biconvex lens A5 with positive focal power from left to right in sequence; the compensation group consists of a double convex lens C1 with third positive focal power, a double concave lens C2 with second negative focal power, a crescent lens C3 with first negative focal power and a double convex lens C4 with fourth positive focal power in sequence from left to right; the refractive index nd of the materials of the first negative-power biconcave lens A3, the second negative-power biconcave lens C2 and the first negative-power crescent lens C3 ranges from 1.40 to 1.50, and the Abbe number vd ranges from 65 to 70; the refractive index nd of the materials of the first positive focal power double-convex lens A1, the first positive focal power crescent lens A2, the second positive focal power crescent lens A4, the second positive focal power double-convex lens A5, the third positive focal power double-convex lens C1 and the fourth positive focal power double-convex lens C4 ranges from 1.40 to 1.45, and the Abbe number vd ranges from 90 to 95.
2. The optical system of the solar-blind ultraviolet band large-target-surface dual-focal-length lens as claimed in claim 1, wherein: the focal length of the first positive focal power biconvex lens A1 is 132.7mm, the focal length of the first positive focal power crescent lens A2 is 277.1mm, the focal length of the first negative focal power biconcave lens A3 is-49.2 mm, the focal length of the second positive focal power crescent lens A4 is 130.1mm, and the focal length of the second positive focal power biconvex lens A5 is 163.2 mm; the focal length of the third positive-focal-power double-convex lens C1 is 51.6mm, the focal length of the second negative-focal-power double-concave lens C2 is-23.44 mm, the focal length of the first negative-focal-power crescent lens C3 is-64.21 mm, and the focal length of the fourth positive-focal-power double-convex lens C4 is 27.08 mm.
3. The optical system of the solar-blind ultraviolet band large-target-surface dual-focal-length lens as claimed in claim 1, wherein: the focal length of the zoom group is 197.8mm, and the focal length of the compensation group is 108.3 mm.
4. The optical system of the solar-blind ultraviolet band large-target-surface dual-focal-length lens as claimed in claim 1, wherein: the substrate of the solar blind ultraviolet band-pass filter is plated with a band-pass filter film which has the central wavelength of 260nm, the spectral range of 240-280nm, high transmittance and the depth cut-off of the rest of spectra; the surfaces of the first positive-power biconvex lens A1, the first positive-power crescent lens A2, the first negative-power biconcave lens A3, the second positive-power crescent lens A4, the second positive-power biconvex lens A5, the third positive-power biconvex lens C1, the second negative-power biconcave lens C2, the first negative-power crescent lens C3 and the fourth positive-power biconvex lens C4 are respectively plated with antireflection films with the central wavelength of 260nm and the spectral range of 240-280 nm.
5. An imaging method based on the solar-blind ultraviolet band large-target-surface double-focal-length lens optical system of claim 1, characterized in that: the position between the diaphragm and the solar blind ultraviolet CCD is fixed and unchanged, the air interval between the zooming group and the diaphragm is made to be variable from 0.85mm to 66mm, the air interval between the diaphragm and the compensation group is made to be variable from 1.5mm to 41.9mm, the air interval between the solar blind ultraviolet band-pass filter and the solar blind ultraviolet CCD is made to be variable from 46.1mm to 5.7mm, and the focal length of 91mm to 165mm is obtained by adjusting the variable interval.
6. The imaging method based on the solar-blind ultraviolet band large-target-surface double-focal-length lens optical system as claimed in claim 5, wherein: the air space between the zooming group and the diaphragm is 0.85mm, the air space between the diaphragm and the compensation group is 1.5mm, and the air space between the solar blind ultraviolet band-pass filter and the solar blind ultraviolet CCD is 46.1mm, so that the focal length of 91mm is obtained.
7. The imaging method based on the solar-blind ultraviolet band large-target-surface double-focal-length lens optical system as claimed in claim 5, wherein: the air space between the zooming group and the diaphragm is set to be 66mm, the air space between the diaphragm and the compensation group is set to be 41.9mm, the air space between the solar blind ultraviolet band-pass filter and the solar blind ultraviolet CCD is set to be 5.7mm, and the focal length of 165mm is obtained.
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| US6172819B1 (en) * | 1997-10-21 | 2001-01-09 | Asahi Kogaku Kogyo Kabushiki Kaisha | Zoom lens system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6172819B1 (en) * | 1997-10-21 | 2001-01-09 | Asahi Kogaku Kogyo Kabushiki Kaisha | Zoom lens system |
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