CN114153049A - Fixed-focus radiation-proof lens - Google Patents
Fixed-focus radiation-proof lens Download PDFInfo
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- CN114153049A CN114153049A CN202111480527.5A CN202111480527A CN114153049A CN 114153049 A CN114153049 A CN 114153049A CN 202111480527 A CN202111480527 A CN 202111480527A CN 114153049 A CN114153049 A CN 114153049A
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- 230000005855 radiation Effects 0.000 claims abstract description 59
- 239000011521 glass Substances 0.000 claims abstract description 35
- 239000006185 dispersion Substances 0.000 claims description 22
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 claims description 6
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 claims description 6
- 108700041286 delta Proteins 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 abstract description 22
- 238000002834 transmittance Methods 0.000 abstract description 14
- 150000002500 ions Chemical class 0.000 abstract description 12
- 229910052751 metal Inorganic materials 0.000 abstract description 10
- 239000002184 metal Substances 0.000 abstract description 10
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 238000013461 design Methods 0.000 description 12
- 239000000243 solution Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 239000005304 optical glass Substances 0.000 description 4
- 229910052725 zinc Inorganic materials 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- 229910052684 Cerium Inorganic materials 0.000 description 3
- 229910017052 cobalt Inorganic materials 0.000 description 3
- 239000010941 cobalt Substances 0.000 description 3
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- -1 cerium ion Chemical class 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000002730 additional effect Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
- 229910000420 cerium oxide Inorganic materials 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 239000003574 free electron Substances 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003758 nuclear fuel Substances 0.000 description 1
- 230000005658 nuclear physics Effects 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
The invention discloses a fixed-focus radiation-proof lens, which comprises a first lens group, a second lens group and a third lens group, wherein the focal length of the first lens group is A, the focal length of the second lens group is B, the focal length of the third lens group is C, A is a fixed value, and then the numerical values of B and C meet the following requirements: b is more than 0.4A and less than 0.6A, and C is more than 0.15A and less than 0.2A. According to the invention, Ce4+ ions and lead are added into the glass, Ce4+ ions capture negative ions e-generated by ionization of the glass when the glass is irradiated by high-energy rays such as gamma rays, the color center generated in the glass is prevented, so that the transmittance is reduced, metal lead can shield X and gamma radiation, after the optical lens is subjected to high-intensity irradiation, the transmittance is reduced by only 25%, and compared with the traditional optical lens, the transmittance is reduced by about 90%, the optical lens has great progress, and the service life of the optical lens is greatly prolonged.
Description
Technical Field
The invention relates to the technical field of radiation-proof lenses, in particular to a fixed-focus radiation-proof lens.
Background
The optical lens is generally designed by adopting a plurality of pieces of optical glass according to optical characteristics, the optical glass is formed by mixing oxides of high-purity silicon, boron, sodium, potassium, zinc, magnesium, calcium, barium, lead and the like according to a specific formula and then melting at high temperature, and under an irradiation environment, the optical lens is used for coloring an oxide color center formed by a positive hole and free electrons caused by nuclear radiation.
In the prior art, in a nuclear radiation scene, after an ordinary lens is subjected to nuclear radiation, particularly gamma radiation, due to the material, the material of the lens is rapidly aged, the phenomenon is that the color center of oxide is colored, the main specific external appearance is that the lens is browned, namely, the material of the lens is changed into brown from original colorless and transparent, the light transmittance is reduced by 90% after irradiation, and the service life of the optical lens is shortened.
Disclosure of Invention
In order to solve the technical problems mentioned in the background art, a fixed focus radiation protection lens is provided.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a focus is fixed and is protected against radiation camera lens, includes first lens group, second lens group and third lens group, the focus of first lens group is A, the focus of second lens group is B, the focus of third lens group is C, and wherein A is the definite value, so B and C's numerical value satisfy:
0.4A＜B＜0.6A，0.15A＜C＜0.2A；
the first lens group consists of a first lens, a second lens, a third lens and a fourth lens, the second lens group consists of a fifth lens, a sixth lens and a seventh lens, and the third lens group consists of an eighth lens and a ninth lens;
the first lens and the eighth lens are made of ZF type glass, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the ninth lens are made of HS type glass, the ZF type glass contains cerium dioxide with the weight percentage of delta 1 and Pb with the weight percentage of lambda 1, the HS type glass contains cerium dioxide with the weight percentage of delta 2 and Pb with the weight percentage of lambda 2, the numerical range of the delta 1 is 0.1-0.5%, the numerical range of the lambda 1 is 4-8%, the numerical range of the delta 2 is 2-4%, and the numerical range of the lambda 2 is 0.1-0.3%.
As a further description of the above technical solution:
the first lens is in a shape of a double-side concave curved surface, the concave curved surface of the first lens is an arc curved surface, the length of the first lens is a1, the width of the first lens is b1, and the radius of the arc curved surface is r1, wherein the b1 is more than 5A1 and less than 7a1, r1 is 3 pi a1, and the a1 is more than 0.04A and less than 0.05A;
one side of the second lens is in a convex curved surface shape, the other side of the second lens is in a concave curved surface shape, the convex curved surface and the concave curved surface are both arc curved surfaces, the length of the second lens is a2, the width of the second lens is b2, the radius of the convex curved surface of the second lens is r21, the radius of the concave curved surface of the second lens is r22, b1 is more than b2 and less than 1.2b1, b2 is more than 4a2 and less than 5a2, r21 is 3 pi a2, and r22 is 0.8r 21;
one side of the third lens is in a convex curved surface shape, the convex curved surface is an arc curved surface, the length of the third lens is a3, the width of the third lens is b3, and the radius of the convex curved surface is r3, wherein b1 is more than b3 and less than 1.1b1, 9a3 is more than b3 and less than 11a3, and r3 is 3 pi a 3;
one side of the fourth lens is in a convex curved surface shape, the other side of the fourth lens is in a concave curved surface shape, the convex curved surface and the concave curved surface are both arc curved surfaces, the length of the fourth lens is a4, the width of the fourth lens is b4, the radius of the convex curved surface is r41, the radius of the concave curved surface is r42, b1 is more than b4 and less than 1.2b1, b4 is more than 10a4 and less than 12a4, r41 is 3 pi a4, and r42 is 0.9r 41.
As a further description of the above technical solution:
the fifth lens is in a shape of a double-side concave curved surface, the concave curved surface of the fifth lens is an arc curved surface, the length of the fifth lens is a5, the width of the fifth lens is b5, and the radius of the arc curved surface is r5, wherein b1 is more than b5 and less than 1.1b1, b5 is more than 5a5 and less than 7a5, and r5 is 3 pi a 5;
the sixth lens is in a shape of a convex curved surface with two sides, the convex curved surface is an arc curved surface, the length of the sixth lens is 0, the width of the sixth lens is b6, and the radius of the arc curved surface is r6, wherein b1 is more than b6 and less than 1.1b1, and r6 is 0.5 pi b 6;
the seventh lens is in a shape of a double-side convex curved surface, the convex curved surface of the seventh lens is an arc curved surface, the length of the seventh lens is a7, the width of the seventh lens is b7, and the radius of the arc curved surface is r7, wherein b1 is more than b7 and less than 1.1b1, 6a7 is more than b7 and less than 8a7, and r7 is 3 pi a 7.
As a further description of the above technical solution:
one side of the eighth lens is in a convex curved surface shape, the other side of the eighth lens is in a concave curved surface shape, the convex curved surface and the concave curved surface are both arc curved surfaces, the length of the eighth lens is a8, the width of the eighth lens is b8, the radius of the convex curved surface is r81, the radius of the concave curved surface is r82, b1 is more than b8 and less than 1.2b1, b8 is more than 3a8 and less than 4a8, r81 is 3 pi a8, and r82 is 0.7r 81.
As a further description of the above technical solution:
one side of the ninth lens is in a convex curved surface shape, the other side of the ninth lens is in a concave curved surface shape, the convex curved surface and the concave curved surface are both arc curved surfaces, the length of the ninth lens is a9, the width of the ninth lens is b9, the radius of the convex curved surface is r91, the radius of the concave curved surface is r92, b1 is more than b9 and less than 1.2b1, b9 is more than 8a9 and less than 10a9, r91 is 3 pi a9, and r92 is 0.9r 91.
As a further description of the above technical solution:
the refractive index of the first lens is Nd1, Nd1 is more than 1.7 and less than 1.9, and the dispersion coefficient is Vd1, Vd1 is more than 20 and less than 30;
the refractive index of the second lens is Nd2, Nd2 is more than 1.5 and less than 1.65, and the dispersion coefficient is Vd2, Vd2 is more than 60 and less than 65;
the refractive index of the third lens is Nd3 and is more than 1.5 and less than Nd3 and less than 1.65, and the dispersion coefficient is Vd3 and is more than 60 and less than Vd 3;
the refractive index of the fourth lens is Nd4 and is more than 1.5 and less than Nd4 and less than 1.6, and the dispersion coefficient is Vd4 and is more than 55 and less than Vd 4.
As a further description of the above technical solution:
the refractive index of the fifth lens is Nd5 and is more than 1.7 and less than Nd5 and less than 1.9, and the dispersion coefficient is Vd5 and is more than 30 and less than Vd5 and less than 40.
As a further description of the above technical solution:
the refractive index of the sixth lens is Nd6 and is more than 1.5 and less than Nd6 and less than 1.65, and the dispersion coefficient is Vd6 and is more than 60 and less than Vd 6.
As a further description of the above technical solution:
the refractive index of the seventh lens is Nd7 and is more than 1.5 and less than Nd7 and less than 1.65, and the dispersion coefficient is Vd7 and is more than 60 and less than Vd 7;
the refractive index of the eighth lens is Nd8, 1.7 < Nd8 < 1.9, and the dispersion coefficient is Vd8, and 20 < Vd8 < 30.
As a further description of the above technical solution:
the refractive index of the ninth lens is Nd9 and is more than 1.7 and less than Nd9 and less than 1.9, and the dispersion coefficient is Vd9 and is more than 40 and less than Vd 9.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the invention, Ce4+ ions and lead are added into the glass, Ce4+ ions capture negative ions e-generated by ionization of the glass when the glass is irradiated by high-energy rays such as gamma rays, the color center generated in the glass is prevented, so that the transmittance is reduced, metal lead can shield X and gamma radiation, after the optical lens is subjected to high-intensity irradiation, the transmittance is reduced by only 25%, and compared with the traditional optical lens, the transmittance is reduced by about 90%, the optical lens has great progress, and the service life of the optical lens is greatly prolonged.
2. In the invention, by limiting the size range and the position of the 9 lenses, the advantages are as follows: direct-injection lens need not extra shielding and refraction, and required material is few, and the design is simple, and is with low costs, and the design of focusing, focus 35mm can cover the big light ring design of wide-angle, and F equals 1.8.
Drawings
Fig. 1 is a schematic diagram illustrating an overall structure of a fixed-focus radiation protection lens according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a first lens of a fixed-focus radiation protection lens provided according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a second lens of a fixed-focus radiation protection lens provided according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram illustrating a third lens of a fixed-focus radiation protection lens according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram illustrating a fourth lens of a fixed-focus radiation protection lens according to an embodiment of the present invention;
fig. 6 shows a schematic structural diagram of a fifth lens of a fixed-focus radiation protection lens provided according to an embodiment of the present invention;
fig. 7 shows a schematic structural diagram of a sixth lens of a fixed-focus radiation protection lens provided according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram illustrating a seventh lens of a fixed-focus radiation protection lens according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram illustrating an eighth lens of a fixed-focus radiation protection lens according to an embodiment of the present invention;
fig. 10 shows a schematic structural diagram of a ninth lens of a fixed-focus radiation protection lens provided according to an embodiment of the present invention.
Illustration of the drawings:
1. a first lens; 2. a second lens; 3. a third lens; 4. a fourth lens; 5. a fifth lens; 6. a sixth lens; 7. a seventh lens; 8. an eighth lens; 9. and a ninth lens.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
Returning to the problem itself, since the material of the lens is rapidly aged and browned after the optical glass is subjected to the ionization effect of nuclear radiation, especially gamma radiation, it is necessary to find a material capable of resisting the ionization effect.
Common photon nuclear radiation includes alpha rays, beta rays and gamma rays, and common particle radiation includes neutron radiation and proton radiation. Alpha rays have weak ionization, even cannot penetrate through a piece of white paper, beta rays have weak ionization, but cannot penetrate through an aluminum plate with several millimeters; the ionization effect of gamma rays is determined by the energy of the gamma rays, the gamma rays with high energy can penetrate a lead plate with the thickness of tens of centimeters, and the gamma rays with the thickness of more than 1MeV are quite harmful. Essentially, the neutron radiation is finally strongly ionized by the gamma rays derived from the impact of neutrons and the atomic lattice of the glass. The energy of neutron radiation is different, and the derived gamma rays are also different. Neutron radiation has the additional effect that some atoms, such as cobalt, tend to absorb unwanted neutrons and become sources of gamma radiation. Similar atoms are also metallic zinc, iodine, and the like. Proton radiation is slightly better than neutron radiation because proton radiation does not allow other atoms to be the source of radiation, otherwise proton radiation is substantially equivalent to neutron radiation.
In the nuclear radiation environment, video monitoring needs to be performed on key areas, such as a nuclear island area, a nuclear fuel concentration area, a nuclear waste treatment area, a radioactive medical substance storage area, a nuclear weapon storage area, a high-energy nuclear physics research experiment area and an outer space high-energy nuclear area of a nuclear power station.
Referring to fig. 1-10, the present invention provides a technical solution: the utility model provides a focus is fixed and is protected against radiation camera lens, includes first lens group, second lens group and third lens group, and the focus of first lens group is A, and the focus of second lens group is B, and the focus of third lens group is C, and wherein A is the definite value, so B and C's numerical value satisfy:
0.4A＜B＜0.6A，0.15A＜C＜0.2A；
the first lens group consists of a first lens 1, a second lens 2, a third lens 3 and a fourth lens 4, the second lens group consists of a fifth lens 5, a sixth lens 6 and a seventh lens 7, and the third lens group consists of an eighth lens 8 and a ninth lens 9;
the first lens 1 and the eighth lens 8 are made of ZF type glass, the second lens 2, the third lens 3, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7 and the ninth lens 9 are made of HS type glass, wherein the ZF type glass contains cerium dioxide with the weight percentage of delta 1 and Pb with the weight percentage of lambda 1, the HS type glass contains cerium dioxide with the weight percentage of delta 2 and Pb with the weight percentage of lambda 2, the numerical range of the delta 1 is 0.1-0.5%, the numerical range of the lambda 1 is 4-8%, the numerical range of the delta 2 is 2-4%, and the numerical range of the lambda 2 is 0.1-0.3%.
| Glass type | Content of cerium oxide wt% | Pb content wt% | Refractive index | Abbe number |
| ZF | 0.1-0.5 | 4-8 | 1.7-1.8 | 26-30 |
| HS | 2-4 | 0.1-0.3 | 1.4-1.5 | 60-70 |
The first lens 1 is in a shape of a double-sided concave curved surface, the concave curved surface is an arc curved surface, the length of the first lens 1 is a1, the width of the first lens is b1, and the radius of the arc curved surface is r1, wherein 5A1 is more than b1 and less than 7a1, r1 is 3 pi a1, and 0.04A is more than a1 and less than 0.05A;
one side of the second lens 2 is in a convex curved surface shape, the other side of the second lens is in a concave curved surface shape, the convex curved surface and the concave curved surface are both arc curved surfaces, the length of the second lens 2 is a2, the width of the second lens is b2, the radius of the convex curved surface is r21, the radius of the concave curved surface is r22, b1 is more than b2 and less than 1.2b1, b2 is more than 4a2 and less than 5a2, r21 is 3 pi a2, and r22 is 0.8r 21;
one side of the third lens 3 is in a convex curved surface shape, the convex curved surface is an arc curved surface, the length of the third lens 3 is a3, the width is b3, and the radius of the convex curved surface is r3, wherein b1 is more than b3 and less than 1.1b1, 9a3 is more than b3 and less than 11a3, and r3 is 3 pi a 3;
the fourth lens 4 has one side with a convex curved surface shape and the other side with a concave curved surface shape, the convex curved surface and the concave curved surface are both arc curved surfaces, the length of the fourth lens 4 is a4, the width of the fourth lens is b4, the radius of the convex curved surface is r41, the radius of the concave curved surface is r42, wherein b1 is more than b4 and less than 1.2b1, 10a4 is more than b4 and less than 12a4, r41 is 3 pi a4, and r42 is 0.9r 41.
The fifth lens 5 is in a shape of a double-sided concave curved surface, the concave curved surface is an arc curved surface, the length of the fifth lens 5 is a5, the width of the fifth lens is b5, and the radius of the arc curved surface is r5, wherein b1 is more than b5 and less than 1.1b1, b5 is more than 5a5 and less than 7a5, and r5 is 3 pi a 5;
the sixth lens 6 is in a shape of a double-sided convex curved surface, the convex curved surface is an arc curved surface, the length of the sixth lens 6 is 0, the width of the sixth lens is b6, and the radius of the arc curved surface is r6, wherein b1 is more than b6 and less than 1.1b1, and r6 is 0.5 pi b 6;
the seventh lens 7 is in a shape of a double-sided convex curved surface, the convex curved surface of the seventh lens is an arc curved surface, the length of the seventh lens 7 is a7, the width of the seventh lens is b7, and the radius of the arc curved surface is r7, wherein b1 is more than b7 and less than 1.1b1, 6a7 is more than b7 and less than 8a7, and r7 is 3 pi a 7.
The eighth lens 8 has a convex curved surface shape on one side and a concave curved surface shape on the other side, the convex curved surface and the concave curved surface are both arc curved surfaces, the length of the eighth lens 8 is a8, the width of the eighth lens is b8, the radius of the convex curved surface is r81, the radius of the concave curved surface is r82, wherein b1 is more than b8 and less than 1.2b1, 3a8 is more than b8 and less than 4a8, r81 is 3 pi a8, and r82 is 0.7r 81.
The ninth lens 9 has a convex curved surface shape on one side and a concave curved surface shape on the other side, the convex curved surface and the concave curved surface are both arc curved surfaces, the length of the ninth lens 9 is a9, the width of the ninth lens is b9, the radius of the convex curved surface is r91, the radius of the concave curved surface is r92, wherein b1 is more than b9 and less than 1.2b1, 8a9 is more than b9 and less than 10a9, r91 is 3 pi a9, and r92 is 0.9r 91.
The refractive index of the first lens 1 is Nd1, 1.7 < Nd1 < 1.9, and the dispersion coefficient is Vd1, 20 < Vd1 < 30; the refractive index of the second lens 2 is Nd2, 1.5 < Nd2 <1.65, and the dispersion coefficient is Vd2, 60< Vd2 < 65; the refractive index of the third lens 3 is Nd3, 1.5 < Nd3 <1.65, and the dispersion coefficient is Vd3, 60< Vd 3; the refractive index of the fourth lens 4 is Nd4, 1.5 < Nd4 <1.6, and the dispersion coefficient is Vd4, 55 < Vd 4; the refractive index of the fifth lens 5 is Nd5, 1.7 < Nd5 < 1.9, and the dispersion coefficient is Vd5, and 30 < Vd5 < 40.
The refractive index of the sixth lens 6 is Nd6, 1.5 < Nd6 <1.65, and the dispersion coefficient is Vd6, 60< Vd 6; the refractive index of the seventh lens 7 is Nd7, 1.5 < Nd7<1.65, and the dispersion coefficient is Vd7, 60< Vd 7; the refractive index of the eighth lens 8 is Nd8, 1.7 < Nd8 < 1.9, the dispersion coefficient is Vd8, 20 < Vd8 < 30, the refractive index of the ninth lens 9 is Nd9, 1.7 < Nd9 < 1.9, the dispersion coefficient is Vd9, and 40 < Vd 9.
In the natural world, a metal cerium ion has a unique characteristic, wherein the English abbreviation of cerium is Ce, the ion of which generally has a positive charge with a valence of 4 and is written as Ce4+, and the Ce4+ ion is introduced into the glass, so that the metal cerium ion can capture negative ions e-generated by ionization of the glass when the glass is irradiated by high-energy rays such as gamma rays and the like, and prevent the color center generated in the glass from causing the reduction of the transmittance.
The resulting reaction formula is: ce4+ + e- > Ce3 +. The greater the amount of Ce4+ incorporated, the stronger the irradiation resistance of the glass.
The metal lead can shield X and gamma radiation, and the internal mechanism is that the larger the atomic number of the lead is, the larger the density is. In the process of X, gamma high-energy photon radiation, lead can enable high energy to have higher probability and interact with itself, thereby achieving the effect of shielding radiation. Of course many heavy elements have the effect of shielding radiation. Lead is a relatively common metal among heavy elements, and can be directly added to optical glass. It is noted that lead is a non-environmentally friendly metal that is only allowed to be used in certain situations
The design needs to use 9 pieces of glass altogether, the module design of the glass is shown in figure 1, in order to match the image sensor, the back focal distance is designed to be 14mm, light enters from the left and is converged on the surface of the image sensor on the right, and the serial numbers of the glass from left to right are 1-9 respectively.
Considering that in the nuclear radiation neutron radiation scene, part of metals (such as cobalt and zinc) can be excited to become a radiation source again, after the optical design is completed, the structural design scheme needs to be considered next. In the structural scheme, firstly, it is required to determine what material is used for manufacturing the lens structural member. The lens structure has two purposes, namely, glass used on the first fixed optical lens; secondly, the shading treatment is carried out on the external light, and stray light is prevented from entering the lens. Considering that nuclear radiation can cause rapid aging of high polymer materials, the design specially selects stainless steel 304 alloy which has excellent performance and does not contain cobalt and zinc to manufacture a structural member.
In order to prevent stray light from entering the lens, namely, to shield external light, the inner surface of the stainless steel 304 alloy needs to be blackened in the design process. The blackening treatment is a technological means for generating compact black oxide on the surface of the alloy so as to prevent light from emitting on the surface of the alloy. The special oxidant for the optical lens is used for high-temperature treatment, and a compact oxide layer is generated on the surface of metal in the treatment process, so that the effect of preventing light reflection is achieved.
The implementation principle and the technical effects are as follows:
after lens design and fabrication we passed 10 sets of experiments with gamma irradiation from a Co60 radiation source at a dose rate of 1 x 105rad/h and a total dose of 1 x 107rad after 100 hours of irradiation.
After the irradiation is finished, the imaging of the lens is still intact, the transmittance of the lens is tested, and the comparison is as follows:
| light transmittance before irradiation | Light transmittance after irradiation | Ratio of decrease in light transmittance before and after |
|
| 1# | 95％ | 72％ | 24.21％ |
| 2# | 96％ | 71％ | 26.04％ |
| 3# | 95％ | 73％ | 23.16％ |
| 4# | 96％ | 71％ | 26.04％ |
| 5# | 95％ | 70％ | 26.32％ |
| 6# | 96％ | 70％ | 27.08％ |
| 7# | 95％ | 72％ | 24.21％ |
| 8# | 96％ | 73％ | 23.96％ |
| 9# | 95％ | 71％ | 25.26％ |
| 10# | 96％ | 73％ | 23.96％ |
The experiment proves that Ce4+ ions and lead are added into the glass, the Ce4+ ions capture negative ions e-generated by ionization of the glass when the glass is irradiated by high-energy rays such as gamma rays and the like, the color center generated in the glass is prevented from reducing the transmittance, the metal lead can shield X and gamma radiation, the lead has higher probability and higher density in the X and gamma high-energy photon radiation process, the lead can enable the high energy to have higher probability and interact with the lead to achieve the effect of shielding the radiation, the light transmittance of the optical lens is reduced by only 25% after the optical lens is irradiated by high intensity, and compared with the traditional optical lens, the optical lens is reduced by about 90%, the optical lens has great progress, and the service life of the optical lens is greatly prolonged.
By defining the size range and position of the 9 lenses, the following advantages are obtained: direct-injection lens need not extra shielding and refraction, needs the material few, and the design is simple, and is with low costs, and the design of fixed focus, focus 35mm can cover the big light ring design of wide-angle, and F equals 1.8.
The optical specifications of the fixed-focus radiation-resistant lens are as follows:
| focal length | 35mm |
| Transparent wave band | 400～700nm |
| Diagonal image height | 21.6mm |
| F number | 1.8 |
| Maximum clear aperture | 65mm |
| TTL | 120mm |
| Number of |
9 |
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The utility model provides a focus is fixed and is protected against radiation camera lens, its characterized in that includes first lens group, second lens group and third lens group, the focus of first lens group is A, the focus of second lens group is B, the focus of third lens group is C, and wherein A is the definite value, then B and C's numerical value satisfy:
0.4A＜B＜0.6A，0.15A＜C＜0.2A；
the first lens group consists of a first lens (1), a second lens (2), a third lens (3) and a fourth lens (4), the second lens group consists of a fifth lens (5), a sixth lens (6) and a seventh lens (7), and the third lens group consists of an eighth lens (8) and a ninth lens (9);
the first lens (1) and the eighth lens (8) are made of ZF type glass, the second lens (2), the third lens (3), the fourth lens (4), the fifth lens (5), the sixth lens (6), the seventh lens (7) and the ninth lens (9) are made of HS type glass, the ZF type glass contains cerium dioxide with the weight percentage of delta 1 and Pb with the weight percentage of lambda 1, the HS type glass contains cerium dioxide with the weight percentage of delta 2 and Pb with the weight percentage of lambda 2, the numerical range of delta 1 is 0.1-0.5%, the numerical range of lambda 1 is 4-8%, the numerical range of delta 2 is 2-4%, and the numerical range of lambda 2 is 0.1-0.3%.
2. The fixed-focus radiation protection lens according to claim 1, wherein the first lens (1) is in a shape of a double-sided concave curved surface, the concave curved surface is an arc curved surface, the length of the first lens (1) is a1, the width of the first lens is b1, and the radius of the arc curved surface is r1, wherein 5A1 < b1 < 7a1, r1 ═ 3 pi a1, 0.04A < a1 < 0.05A;
one side of the second lens (2) is in a convex curved surface shape, the other side of the second lens is in a concave curved surface shape, the convex curved surface and the concave curved surface are both arc curved surfaces, the length of the second lens (2) is a2, the width of the second lens is b2, the radius of the convex curved surface of the second lens is r21, the radius of the concave curved surface of the second lens is r22, wherein b1 is more than b2 and less than 1.2b1, 4a2 is more than b2 and less than 5a2, r21 is 3 pi a2, and r22 is 0.8r 21;
one side of the third lens (3) is in the shape of a convex curved surface, the convex curved surface is an arc curved surface, the length of the third lens (3) is a3, the width of the third lens is b3, and the radius of the convex curved surface is r3, wherein b1 is more than b3 and less than 1.1b1, 9a3 is more than b3 and less than 11a3, and r3 is 3 pi a 3;
one side of the fourth lens (4) is in a convex curved surface shape, the other side of the fourth lens is in a concave curved surface shape, the convex curved surface and the concave curved surface are both arc curved surfaces, the length of the fourth lens (4) is a4, the width of the fourth lens is b4, the radius of the convex curved surface is r41, the radius of the concave curved surface is r42, wherein b1 is more than b4 and less than 1.2b1, 10a4 is more than b4 and less than 12a4, r41 is 3 pi a4, and r42 is 0.9r 41.
3. The fixed-focus radiation protection lens according to claim 2, wherein the fifth lens (5) is in a shape of a double-sided concave curved surface, the concave curved surface is an arc curved surface, the length of the fifth lens (5) is a5, the width of the fifth lens is b5, and the radius of the arc curved surface is r5, wherein b1 < b5 < 1.1b1, 5a5 < b5 < 7a5, and r5 is 3 pi a 5;
the sixth lens (6) is in a shape of a double-side convex curved surface, the convex curved surface of the sixth lens is an arc curved surface, the length of the sixth lens (6) is 0, the width of the sixth lens is b6, and the radius of the arc curved surface is r6, wherein b1 is more than b6 and less than 1.1b1, and r6 is 0.5 pi b 6;
the seventh lens (7) is in a shape of a double-side convex curved surface, the convex curved surface of the seventh lens is an arc curved surface, the length of the seventh lens (7) is a7, the width of the seventh lens is b7, and the radius of the arc curved surface is r7, wherein b1 is more than b7 and less than 1.1b1, 6a7 is more than b7 and less than 8a7, and r7 is 3 pi a 7.
4. The fixed-focus radiation protection lens according to claim 3, wherein said eighth lens (8) has a convex curved surface shape on one side and a concave curved surface shape on the other side, said convex curved surface and said concave curved surface are both curved surfaces, said eighth lens (8) has a length of a8 and a width of b8, the radius of the convex curved surface is r81, and the radius of the concave curved surface is r82, wherein b1 < b8 < 1.2b1, 3a8 < b8 < 4a8, r81 ═ 3 π a8, and r82 ═ 0.7r 81.
5. The fixed-focus radiation protection lens according to claim 4, wherein said ninth lens (9) has a convex curved surface shape on one side and a concave curved surface shape on the other side, said convex curved surface and said concave curved surface are both curved surfaces, said ninth lens (9) has a length of a9 and a width of b9, the radius of the convex curved surface is r91, and the radius of the concave curved surface is r92, wherein b1 < b9 < 1.2b1, 8a9 < b9 < 10a9, r91 ═ 3 π a9, and r92 ═ 0.9r 91.
6. A fixed focus radiation protection lens according to claim 5, wherein said first lens (1) has a refractive index Nd1 and 1.7 < Nd1 < 1.9, and an Abbe number Vd1 and 20 < Vd1 < 30;
the refractive index of the second lens (2) is Nd2, 1.5 & lt Nd2 & lt 1.65, and the dispersion coefficient is Vd2, 60 & lt Vd2 & lt 65;
the refractive index of the third lens (3) is Nd3, 1.5 < Nd3 <1.65, and the dispersion coefficient is Vd3, and 60< Vd 3;
the refractive index of the fourth lens (4) is Nd4, 1.5 < Nd4 <1.6, and the dispersion coefficient is Vd4, and 55 < Vd 4.
7. A fixed focus radiation protection lens according to claim 6, wherein said fifth lens (5) has a refractive index Nd5 and 1.7 < Nd5 < 1.9, and an Abbe number Vd5 and 30 < Vd5 < 40.
8. A fixed focus radiation protection lens according to claim 7, wherein said sixth lens element (6) has a refractive index Nd6 and 1.5 < Nd6 <1.65, and an Abbe number Vd6 and 60< Vd 6.
9. A fixed focus radiation protection lens according to claim 8, wherein said seventh lens (7) has a refractive index Nd7, and 1.5 < Nd7<1.65, and an abbe number Vd7, and 60< Vd 7;
the refractive index of the eighth lens (8) is Nd8, 1.7 < Nd8 < 1.9, and the dispersion coefficient is Vd8, and 20 < Vd8 < 30.
10. A fixed focus radiation protection lens according to claim 9, wherein said ninth lens (9) has a refractive index Nd9, and 1.7 < Nd9 < 1.9, and an abbe number Vd9, and 40 < Vd 9.
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| TWI832382B (en) * | 2022-08-18 | 2024-02-11 | 大陸商信泰光學（深圳）有限公司 | Range finder and lens assembly thereof |
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