CN109407252A - A kind of high electromagnetic shielding optical window and preparation method thereof - Google Patents
A kind of high electromagnetic shielding optical window and preparation method thereof Download PDFInfo
- Publication number
- CN109407252A CN109407252A CN201811516006.9A CN201811516006A CN109407252A CN 109407252 A CN109407252 A CN 109407252A CN 201811516006 A CN201811516006 A CN 201811516006A CN 109407252 A CN109407252 A CN 109407252A
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- Prior art keywords
- optical window
- metallic mesh
- shielding
- optical
- electromagnetic
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/007—Pressure-resistant sight glasses
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0094—Shielding materials being light-transmitting, e.g. transparent, translucent
Abstract
The present invention relates to a kind of high electromagnetic shielding optical windows and preparation method thereof, belong to photoelectric communication and electromangnetic spectrum field, the shielding optical window includes optical glass and metallic mesh, the optical glass is equipped with 2 pieces, and metallic mesh is located between 2 blocks of optical glass, the metallic mesh and optical glass are bonding, and metallic mesh has periodic structure, optical glass and metallic mesh are combined preparation shielding optical window by the present invention, both there is high electromagnetic shielding performance, optoelectronic device optical lens detection image function is not influenced again, it efficiently solves in intense radiation, the electromagnetic protection problem of optical system lens under strong electromagnetic interference environment, effect is preferable in practical applications, do not occur picture image flashing, the case where blank screen or optical system are damaged by strong electromagnetic.Meanwhile the line width and mesh number of metallic mesh can be selected according to shielding requirements, the shielding optical window with different shield effectiveness is prepared, is had high economic benefit.
Description
Technical field
The invention belongs to photoelectric communication and electromangnetic spectrum field, relate in particular to a kind of high electromagnetic shielding optical window and
Preparation method.
Background technique
Optical detector or the first-class similar optoelectronic device of video camera in High Power Microwave System (abbreviation HPM system)
It needs to use under high-intensity magnetic field, strong radiation environment system, when pulse power supply and electromagnetic field work, optoelectronic device is by dry
The phenomenon that will appear moment blank screen or flating is disturbed, in such a case long-play, eventually results in optical device hair
Raw irreversible damage, and optical device, especially as the big front optical detector of detection target, price general charged all compares
Costly, therefore, it is necessary to carry out electromagnetic shielding protection to optical device (electro-optical system), meet electromagnetic shielding performance requirement.
Currently, the method generallyd use to the design of installation electromagnetical shielding protection is section of metallic shield protection or corresponding frequencies
Only waveguide, such as common electromagnetic shielding cabinet, waveguide etc..But using the method for metallic shield cabinet or cut-off waveguide
Strong electromagnetic shielding protection to optoelectronic device is simultaneously not suitable for, and is primarily due to: (1) body part of optoelectronic device can be using gold
Belong to shielded box protection design, but optical lens needs detection image, metal protection, but intense radiation, forceful electric power cannot be used at camera lens
Magnetic still can enter internal photoelectric processing circuit from camera lens, cause optoelectronic device abnormal；(2) using for certain frequency
Optical device camera lens is protected in cut-off waveguide design, on the one hand will affect optical device detection viewing field range, another party
Face installs waveguide additional on camera lens, and mounting process is also complex.Therefore, main to the electromagnetic shielding protection design of optoelectronic device
It is design of Electromagnetic Shielding to be carried out to its optical lens, i.e., design is high is electromagnetically shielded optical window.
Presently disclosed data essentially consists in two aspects: being on the one hand the research to electromagnetic shielding optical window material, such as periodical
Paper " ultra-thin electromagnetic shields optical window Meta Materials wave absorbing device " (author: white positive element etc.) " Acta Optica " (2017.8 Vol.37, Nov
8) what is introduced in is a kind of material that can penetrate electromagnetic wave.Another aspect is to shield the preparation method of optical window, general two kinds
Method: the metallic mesh using conductive conductive metal ito film or light window etching reflection specific band reaches optical window screen
The purpose covered.But pass through actual test, electromagnetic shielding performance reaches 30dB under the conditions of maximum 1GHz electromagenetic wave radiation, other
Ordinary circumstance is more than ten dB, and transmitance can achieve 80% or more.And optoelectronic device is under HPM service condition, it is desirable that
Under the high intense radiation of the microwave of 2.4GHz ± 100MHz, the requirement that electromagnetic shielding performance is not less than 60dB is reached in range.Obviously, it adopts
It is unable to satisfy the index request of High Power Microwave System in aforementioned manners.
Summary of the invention
For various deficiencies of the prior art, to solve the above-mentioned problems, it is proposed that a kind of high electromagnetic shielding optical window and its
Preparation method reaches electromagnetic shielding performance and is not less than to meet under the high intense radiation of microwave of 2.4GHz ± 100MHz in range
The requirement of 60dB.
To achieve the above object, the invention provides the following technical scheme:
A kind of high electromagnetic shielding optical window, including optical glass and metallic mesh, the optical glass are equipped with 2 pieces, and metal
Grid is located between 2 blocks of optical glass, and the metallic mesh and optical glass are bonding, and metallic mesh has periodically knot
Structure.
Further, the periodic structure is round or polygon.
Further, the line period of the metallic mesh is g, line width 2a, with a thickness of t, and the admittance of metallic mesh
It is inductive；
Assuming that electromagnetic wave in free space vertical incidence to shielding optical window, as t≤2a≤g, metallic mesh has normalization
Admittance, thenWherein, y indicates admittance, and f is normalization resonance wavelength, and λ is electromagnetic wave wave
It is long, f0For electromagnetic wave centre frequency, andAs λ >=g, then
Further, for the electromagnetic wave band of 2.4GHz ± 100MHz frequency range, then there is y2≤ 1, electromagnetic wave hangs down in free space
When being directly incident to shielding optical window, the transmitance for shielding optical window is T (0,0), then
Definition shields the shield effectiveness of optical window as s, and s=-10lg (T), λ=0.125m is taken, with optics point spread function
Derive the transmitance T of shielding optical window centre grade0(0,0), thenWherein, the transmission of k and optical glass
Rate is related, and optical glass with a thickness of 4.7mm or so, since the thickness of optical glass is smaller, the transmitance pair of optical glass
Shielding optical window transmitance influences less, and therefore, k is negligible.
In addition, including the following steps: the present invention also provides a kind of preparation method of high electromagnetic shielding optical window
S1: the transmitance of optical window is required and shielded according to electromagnetic shielding performance, prepares metallic mesh；
S2: optical glass is bonded respectively above and below metallic mesh.
Further, the metallic mesh has periodic structure, and the periodic structure is round or polygon.
Further, the line period of the metallic mesh is g, line width 2a, with a thickness of t, and the admittance of metallic mesh
It is inductive；
Assuming that electromagnetic wave in free space vertical incidence to shielding optical window, as t≤2a≤g, metallic mesh has normalization
Admittance, thenWherein, y indicates admittance, and f is normalization resonance wavelength, and λ is electromagnetic wave wave
It is long, andAs λ >=g, then
Further, for the electromagnetic wave band of 2.4GHz ± 100MHz frequency range, then there is y2≤ 1, electromagnetic wave hangs down in free space
When being directly incident to shielding optical window, the transmitance for shielding optical window is T (0,0), then
Definition shields the shield effectiveness of optical window as s, and s=-10lg (T), λ=0.125m is taken, with optics point spread function
Derive the transmitance T of shielding optical window centre grade0(0,0), thenWherein, the transmission of k and optical glass
Rate is related, and k is negligible.
The beneficial effects of the present invention are:
Optical glass and metallic mesh are combined into preparation shielding optical window, not only there is high electromagnetic shielding performance, but also do not influence
Optoelectronic device optical lens detection image function, efficiently solves the optical system mirror under intense radiation, strong electromagnetic interference environment
The electromagnetic protection problem of head, effect is preferable in practical applications, does not occur picture image flashing, blank screen or optical system by forceful electric power
The case where magnetic disturbance damages.Meanwhile the line width and mesh number of metallic mesh can be selected according to shielding requirements, preparation has difference
The shielding optical window of shield effectiveness, has high economic benefit.
Detailed description of the invention
Fig. 1 is overall structure diagram of the invention；
Fig. 2 is the corresponding transmitance of shielding optical window and shield effectiveness signal in the not collinear period prepared in embodiment one
Figure, wherein the unit for etching line thickness is m, and the unit of shield effectiveness is dB.
In attached drawing: 1- optical glass, 2- metallic mesh.
Specific embodiment
It is right below with reference to attached drawing of the invention in order to make those skilled in the art more fully understand technical solution of the present invention
Technical solution of the present invention carries out clear, complete description, and based on the embodiment in the application, those of ordinary skill in the art exist
Other similar embodiments obtained under the premise of creative work are not made, shall fall within the protection scope of the present application.
In addition, the direction word mentioned in following embodiment, such as "upper" "lower" " left side " " right side " etc. are only the directions with reference to attached drawing, because
This, the direction word used is for illustrative and not limiting the invention.
Embodiment one:
As shown in Figure 1, a kind of high electromagnetic shielding optical window, including optical glass 1 and metallic mesh 2, the optical glass 1 are set
There are 2 pieces, and metallic mesh 2 is located between 2 blocks of optical glass 1, the metallic mesh 2 and optical glass 1 are bonding, and metal mesh
Grid 2 have periodic structure, and the periodic structure is round or polygon.
A kind of preparation method of high electromagnetic shielding optical window, includes the following steps:
S1: the transmitance of optical window is required and shielded according to electromagnetic shielding performance, metallic mesh 2 is prepared, due to metal mesh
Grid 2 can have a certain impact to the image quality of metallic mesh 2, the size of influence degree and the line width and mesh number of metallic mesh 2
It is related, wherein the mesh number of metallic mesh 2 is related with the line period；
S2: optical glass 1 is bonded respectively above and below metallic mesh 2.
Specifically, the line period of the metallic mesh 2 is g, line width 2a, with a thickness of t, and metallic mesh 2 is led
It is inductive for receiving.Assuming that electromagnetic wave in free space vertical incidence to optical window is shielded, as t≤2a≤g, metallic mesh 2 has
Reduced admittance, thenWherein, y indicates admittance, and f is normalization resonance wavelength, and λ is electricity
Magnetic wave wavelength, f0For electromagnetic wave centre frequency, andAs λ >=g, thenFor 2.4GHz
The electromagnetic wave band of ± 100MHz frequency range, then have y2≤ 1, electromagnetic wave shields light in free space vertical incidence to shielding optical window
The transmitance of window 2 is T (0,0), thenDefinition shields the shield effectiveness of optical window as s, and s
=-10lg (T), takes λ=0.125m, and the transmitance T of shielding optical window centre grade is derived with optics point spread function0(0,0), thenWherein, k is related with the transmitance of optical glass 1, since optical glass 1 is with a thickness of the left side 4.7mm
The right side, thickness is smaller, and the transmitance of optical glass 1 influences less shielding optical window transmitance, and therefore, k is negligible.
As shown in Fig. 2, the corresponding transmitance of shielding optical window and shield effectiveness in not collinear period manufactured in the present embodiment.It takes
When etching line thickness is 9um, shielding optical window can reach the shield effectiveness of 60dB, and transmitance has decreased to 0.4 or so, and (43% is left
It is right).In this case, shielding anti-reflection film, under the high intense radiation of microwave of 2.4GHz ± 100MHz, plating are plated to optical glass 1
The shield effectiveness of optical window is shielded after film up to 60dB, transmitance is increased to 50% or more.
By qualified third-party testing, in the case where 2.4GHz ± 100MHz, using 165 mesh prepared by the present invention
Shielding optical window, shield effectiveness can achieve 65dB；Using the shielding optical window of 84 mesh prepared by the present invention, shield effectiveness can reach
To 60dB.And the shielding optical window of ITO conductive film is tested, shield effectiveness 32dB.Shielding optical window is not used, directly using general
Light passing window, shield effectiveness 2dB.
The above has been described in detail, described above, is only a preferred embodiment of the present invention, when cannot
It limit the scope of implementation of the present invention, i.e., it is all according to the made equivalent changes and modifications of the application range, it should still belong to covering scope of the present invention
It is interior.
Claims (8)
1. a kind of high electromagnetic shielding optical window, which is characterized in that including optical glass and metallic mesh, the optical glass is equipped with 2
Block, and metallic mesh is located between 2 blocks of optical glass, the metallic mesh and optical glass are bonding, and metallic mesh has
Periodic structure.
2. a kind of high electromagnetic shielding optical window according to claim 1, which is characterized in that the periodic structure be it is round or
Polygon.
3. a kind of high electromagnetic shielding optical window according to claim 2, which is characterized in that the line period of the metallic mesh is
G, line width 2a, the admittance with a thickness of t, and metallic mesh are inductive；
Assuming that electromagnetic wave in free space vertical incidence to shielding optical window, as t≤2a≤g, metallic mesh has reduced admittance,
ThenWherein, y indicates admittance, and f is normalization resonance wavelength, and λ is electromagnetic wavelength, f0
For electromagnetic wave centre frequency, andAs λ >=g, then
4. a kind of high electromagnetic shielding optical window according to claim 3, which is characterized in that for 2.4GHz ± 100MHz frequency range
Electromagnetic wave band, then have y2≤ 1, for electromagnetic wave in free space vertical incidence to shielding optical window, the transmitance for shielding optical window is T
(0,0), then
Definition shields the shield effectiveness of optical window as s, and s=-10lg (T), takes λ=0.125m, is derived with optics point spread function
The transmitance T of optical window centre grade is shielded out0(0,0), thenWherein, the transmitance of k and optical glass has
It closes, k is negligible.
5. a kind of preparation method using the high electromagnetic shielding optical window as described in claim 1-4 any one, which is characterized in that
Include the following steps:
S1: the transmitance of optical window is required and shielded according to electromagnetic shielding performance, prepares metallic mesh；
S2: optical glass is bonded respectively above and below metallic mesh.
6. preparation method according to claim 5, which is characterized in that the metallic mesh has periodic structure, described
Periodic structure is round or polygon.
7. preparation method according to claim 6, which is characterized in that the line period of the metallic mesh is g, and line width is
2a, the admittance with a thickness of t, and metallic mesh are inductive；
Assuming that electromagnetic wave in free space vertical incidence to shielding optical window, as t≤2a≤g, metallic mesh has reduced admittance,
ThenWherein, y indicates admittance, and f is normalization resonance wavelength, and λ is electromagnetic wavelength, andAs λ >=g, then
8. preparation method according to claim 7, which is characterized in that for the electromagnetic wave of 2.4GHz ± 100MHz frequency range
Section, then have y2≤ 1, for electromagnetic wave in free space vertical incidence to shielding optical window, the transmitance for shielding optical window is T (0,0), then
Definition shields the shield effectiveness of optical window as s, and s=-10lg (T), takes λ=0.125m, is derived with optics point spread function
The transmitance T of optical window centre grade is shielded out0(0,0), thenWherein, the transmitance of k and optical glass has
It closes, k is negligible.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811516006.9A CN109407252A (en) | 2018-12-12 | 2018-12-12 | A kind of high electromagnetic shielding optical window and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811516006.9A CN109407252A (en) | 2018-12-12 | 2018-12-12 | A kind of high electromagnetic shielding optical window and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110418563A (en) * | 2019-07-23 | 2019-11-05 | 西安工业大学 | Geometry topological structure applied to electromagnetic shielding |
| CN111148387A (en) * | 2019-12-13 | 2020-05-12 | 武汉航空仪表有限责任公司 | Electromechanical controller observation window |
| CN114966615A (en) * | 2022-07-13 | 2022-08-30 | 中国科学院长春光学精密机械与物理研究所 | Double-cabin photoelectric detection system capable of detecting weak and small targets in strong electromagnetic pulse environment |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110418563A (en) * | 2019-07-23 | 2019-11-05 | 西安工业大学 | Geometry topological structure applied to electromagnetic shielding |
| CN111148387A (en) * | 2019-12-13 | 2020-05-12 | 武汉航空仪表有限责任公司 | Electromechanical controller observation window |
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| CN114966615A (en) * | 2022-07-13 | 2022-08-30 | 中国科学院长春光学精密机械与物理研究所 | Double-cabin photoelectric detection system capable of detecting weak and small targets in strong electromagnetic pulse environment |
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Application publication date: 20190301 |