CN107091692A - A kind of thermal infrared imager - Google Patents
A kind of thermal infrared imager Download PDFInfo
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- CN107091692A CN107091692A CN201710325330.1A CN201710325330A CN107091692A CN 107091692 A CN107091692 A CN 107091692A CN 201710325330 A CN201710325330 A CN 201710325330A CN 107091692 A CN107091692 A CN 107091692A
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/95—Computational photography systems, e.g. light-field imaging systems
- H04N23/951—Computational photography systems, e.g. light-field imaging systems by using two or more images to influence resolution, frame rate or aspect ratio
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
- H04N5/265—Mixing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J2005/0077—Imaging
Abstract
The invention discloses a kind of thermal infrared imager, infrared movement, many optical filter switching mechanisms and infrared lens including pedestal and on the pedestal, the infrared movement controls many optical filter switching mechanisms to be switched in the light path of the infrared lens, the infrared lens is shot respectively to the gas cloud background image before and after filtered filtering, and fusion of imaging is carried out to the gas cloud background image before and after described filtered filtering.So thermal infrared imager of the present invention can strengthen the imaging of background object, whole picture is set more to have a sense of hierarchy, it is easy to differentiate the particular location of SF6 leakage points.So it can accurately search SF6 leakage points using thermal infrared imager of the present invention.
Description
Technical field
The present invention relates to infrared imagery technique field, more particularly to a kind of refrigeration thermal infrared imager.
Background technology
With the development of electric utility, SF6 is widely used in bulk of worldwide electricity as the superior insulation of pole base, arc-extinguishing medium
In high pressure road device and transformer in industry.Now, it almost turns into unique exhausted in high pressure, extra high voltage circuit breaker and GIS
Edge medium.Pure SF6 gases are colourless, tasteless, non-ignitable, and chemical property is particularly stable at normal temperatures, are 5 times of air specific weight
It is many.But in power system, under the influence of the factors such as electric arc shelf depreciation, high temperature, SF6 gases can be decomposed.Its decomposition
Thing can generate aggressive electrolyte after meeting water, especially some high toxicity analytes, such as SF4, S2F2, SOF2, HF, SO2, people
Body, which is largely sucked, can cause dizzy and pulmonary edema, or even stupor and death.In the interior of opposing seal, due to air circulation not
Freely, SF6 and its analyte are deposited indoors, and it is colourless, tasteless to add SF6 gases, thus to making an inspection tour, maintainer produce it is great
Harm.For example after such as GIS of the switchgear house equipped with SF6 equipment produces leakage, SF6 accumulated gases low layer space above terrace,
After finite concentration is reached, if staff gets in, cerebral anoxia can be caused, asphyxia, or even stupor and death is made one,
So as to cause serious accident.Just because of the harmfulness of SF6 gases,《Electrical safe working order》(power plant and power transformation
Stand part) special provision, the switchgear house equipped with SF6 equipment must assure that SF6 gas concentrations are less than 1000ppm, except must installing it is strong
Outside power ventilation unit, it is necessary to which the oxygen measuring apparatus that can be alarmed and SF6 gas concentrations detection alarm etc. are installed.
Conventional detection SF6 method has four kinds at present：1, electrochemical techniques：Figaro sensor or halogen gas sensing
Device；2, high-voltage breakdown technology；3, infrared spectrum technology；4, electronics capture ECD principles.With reference to table below, by volume ratio
Concentration is put into sealing container for 100PPM SF6 gases, and the equipment that four kinds of methods of the above are respectively adopted is tested and by PC
Analytical conclusions are as follows：
It can be seen that, really energy qualitative and quantitative detection only has the refrigerating infrared imaging instrument according to infrared spectrum technology to SF6.Separately
Outside, refrigerating infrared imaging instrument can also detect ammonia, LOCTITE 411, chlorine dioxide, acetic acid, dichlorodifluoromethane, ethene,
Butanone etc..However, existing infrared thermoviewer is in probe gas, the imaging reduction of background object makes whole picture without level
Sense, it is difficult to differentiate the particular location of leakage point.
So, prior art, which exists, can not accurately search the defect of SF6 leakage points.
The content of the invention
In view of the above problems, it is proposed that the present invention so as to provide one kind overcome above mentioned problem or at least in part solve on
State the thermal infrared imager of problem.
In a first aspect, a kind of thermal infrared imager is provided in the embodiment of the present invention, including：Pedestal and installed in the base
Infrared movement, many optical filter switching mechanisms and infrared lens on seat, the infrared movement control many optical filter switching mechanisms to exist
Switched in the light path of the infrared lens, make the infrared lens respectively to the gas cloud background before and after filtered filtering
Image is shot, and carries out fusion of imaging to the gas cloud background image before and after described filtered filtering.
With reference in a first aspect, of the invention in the first implementation of first aspect, many optical filter switching mechanisms
Including encoder, motor, switching support and multiple optical filters on the switching support, the switching support point
Not with encoder, motor connection；The encoder, motor are connected with the infrared movement respectively；The infrared movement is according to institute
The output signal of encoder is stated, controls the motor to drive the switching support rotation, makes to be arranged on the switching support
Optical filter is switched in the light path of the infrared lens.
With reference to the first implementation of first aspect, the present invention is described in second of implementation of first aspect
The main control that infrared movement includes infrared detector, is connected respectively with the infrared detector, encoder, motor, infrared lens
Device.
With reference to second of implementation of first aspect, the present invention is described in the third implementation of first aspect
Master controller includes：
Infrared detecting unit, for being connected with the infrared detector, the exposure that analysis obtains the infrared detector is special
Property；
Switch support monitoring unit, be connected with the encoder, for receiving the encoder output, obtain described
Switch the current angular displacement information of support；
Motor control unit, is connected respectively with the motor, infrared detecting unit, for according to the infrared detecting unit
The exposure characteristic of the infrared detector obtained, and the switching support monitoring unit switching support that obtains are worked as
Preceding angular displacement information controls the rotation of the motor so that the shooting of optical filter on the switching support in the infrared lens
Time point appears on the light path center of the infrared lens exactly；
Infrared lens shooting unit, is connected with the infrared lens, for controlling the infrared lens respectively to filtered
Gas cloud background image before and after piece filtering is shot, and obtains the gas cloud background image before and after filtered filtering；
Image fusion unit, is connected with the infrared lens shooting unit, infrared detecting unit, for the infrared mirror
Gas cloud background image before and after the filtered filtering that head shooting unit is obtained carries out fusion of imaging.
With reference to the third implementation of first aspect, the present invention is described in the 4th kind of implementation of first aspect
Master controller also includes time point setup unit, is connected with the infrared detecting unit, for according to the infrared detecting unit
The exposure characteristic of the infrared detector obtained, calculates the shooting time point of the setting infrared lens；
The motor control unit, is connected with the motor, time point setup unit, for being set according to the time point
The shooting time point of the infrared lens of unit setting, and the switching support that the switching support monitoring unit is obtained
Current angular displacement information control the rotation of the motor so that the optical filter on the switching support is according to the described red of setting
The shooting time point of outer camera lens is accurately appeared on the light path center of the infrared lens.
With reference to the first implementation of first aspect, the present invention is also wrapped in the 5th kind of implementation of first aspect
Image output unit is included, is connected with the master controller, for carrying out image output display.
With reference to the first implementation of first aspect, the present invention is also wrapped in the 6th kind of implementation of first aspect
Memory is included, is connected with the master controller.
With reference to the first implementation of first aspect, the present invention is also wrapped in the 7th kind of implementation of first aspect
Include power supply.
The technical scheme provided in the embodiment of the present application, has at least the following technical effects or advantages：
The invention discloses a kind of thermal infrared imager, including pedestal and infrared movement on the pedestal, many filters
Mating plate switching mechanism and infrared lens, the infrared movement control many optical filter switching mechanisms in the light path of the infrared lens
Switch over, the infrared lens is shot respectively to the gas cloud background image before and after filtered filtering, and to institute
The gas cloud background image progress fusion of imaging before and after filtered filtering is stated, i.e., infrared movement control infrared lens are having respectively
Optical filter and it is free of light filter in the case of gas cloud background image is shot and the gas cloud background image photographed is entered
Row fusion, it is possible thereby to strengthen the imaging of background object, makes whole picture more have a sense of hierarchy, it is easy to differentiate SF6 leakage points
Particular location.So it can accurately search SF6 leakage points using thermal infrared imager of the present invention.
Described above is only the general introduction of technical solution of the present invention, in order to better understand the technological means of the present invention,
And can be practiced according to the content of specification, and in order to allow above and other objects of the present invention, feature and advantage can
Become apparent, below especially exemplified by the embodiment of the present invention.
Brief description of the drawings
By reading the detailed description of hereafter preferred embodiment, various other advantages and benefit is common for this area
Technical staff will be clear understanding.Accompanying drawing is only used for showing the purpose of preferred embodiment, and is not considered as to the present invention
Limitation.And in whole accompanying drawing, identical part is denoted by the same reference numerals.In the accompanying drawings：
Fig. 1 shows a kind of structural representation of thermal infrared imager according to an embodiment of the invention；
Fig. 2 shows a kind of group of the switching mechanism of many optical filters of thermal infrared imager according to an embodiment of the invention
Into schematic diagram；
Fig. 3 shows the spectral absorption bands schematic diagram of SF6 gases according to an embodiment of the invention；
Fig. 4 shows the image comparison of two width amixis before and after filtered filtering according to an embodiment of the invention
Figure；
Fig. 5 shows the image comparison figure before and after progress fusion of imaging according to an embodiment of the invention；
Fig. 6 shows a kind of structural representation of thermal infrared imager in accordance with another embodiment of the present invention.
Embodiment
The exemplary embodiment of the disclosure is more fully described below with reference to accompanying drawings.Although showing the disclosure in accompanying drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
Limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
Complete conveys to those skilled in the art.
The embodiments of the invention provide a kind of thermal infrared imager, in order to can strengthen the imaging of background object,
Whole picture is more had a sense of hierarchy, it is easy to differentiate the particular location of SF6 leakage points, can accurately search SF6 leakage points.
Fig. 1 is refer to below, the invention discloses a kind of thermal infrared imager, including：Pedestal 4 and installed in the pedestal 4
On infrared movement 1, many optical filter switching mechanisms 2 and infrared lens 3, the infrared movement 1 controls many optical filter switching mechanisms 2
Switched in the light path of the infrared lens 3, make the infrared lens 3 respectively to the gas cloud before and after filtered filtering
Background image is shot, and carries out fusion of imaging to the gas cloud background image before and after described filtered filtering.
Specifically, infrared movement 1, infrared lens 3 and optical filter switching mechanism 2 are installed on pedestal 4, red after power-up
Outer movement 1 drives all active devices to work, and infrared light aggregation is imaged onto infrared movement 1 by infrared movement 1 and infrared lens 3
On the focal plane of detector.Pass through infrared lens 3, the spy of the infrared movement 1 of infrared band (10 microns~11 microns) light spectrum image-forming
On the focal plane for surveying device, the target object that there is temperature difference forms the different image of contrast on focal plane.Infrared machine
The temperature distribution image of target physical is converted to video image by core 1 by means such as opto-electronic conversion, Electric signal processings.
It should be noted that the present invention utilizes thermal imaging principle, in the case of no optical filter, due to the gas of leakage
Done in the object of other relative high-energy high heat under background, itself energy is very low in other words, so the gas from imaging effect
Body just look at not substantially, so that it is difficult to find out leak point, but see in this case gas periphery object be very it will be evident that
Record image now；Plus this specific optical filter, (optical filter can filter out the infrared of wavelength beyond 10~11um
Spectrum) after, substantially just it can only see within this 10~11um wavelength, and SF6 absorption spectrum is in 10.6um or so,
So will look at from the upper gas of imaging it is obvious that but the object on gas periphery to look at effect just bad, record and now scheme
Then record two kinds of images are passed through algorithm fusion by picture, and leakage point is found on image that just can be after fusion.
As an alternative embodiment, as shown in Fig. 2 many optical filter switching mechanisms 2 include encoder 6, electricity
Machine 5, switching support 7 and installed in it is described switching support 7 on multiple optical filters 8, it is described switching support 7 respectively with coding
Device 6, motor 5 are connected；The encoder 6, motor 5 are connected with the infrared movement 1 respectively；The infrared movement 1 is according to described
The output signal of encoder 6, controls the motor 5 to drive the switching support 7 to rotate, and makes to be arranged on the switching support 7
Optical filter 8 switched in the light path of the infrared lens 3.
It should be noted that optical filter switching mechanism 2 works under the control of infrared movement 1, motor 5 drives support 7 to revolve
Turn, when having optical filter 8 in light path, background image contrast is poor in image and gas cloud imaging is strong, record is now imaged.In light path
When free of light filter 8, background image contrast is strong in image and gas cloud is re-recorded and is now imaged into aberration, is before filtering in Fig. 4
Two images contrast afterwards.Optical filter can filter the infrared spectrum beyond 10~11 microns, and Fig. 3 divides for SF6 absorption spectrum
Butut.
The principle of gas imaging：1, gas absorption bands, 1. (camera) can see infra-red radiation to infrared movement；2, gas
Cloud has a radiation background；3, the surface temperature of gas cloud must be different from background；4, the motion energy lift gas of gas cloud
Visibility.
As an alternative embodiment, as shown in fig. 6, the infrared movement 1 include infrared detector 11, respectively with
The master controller 12 that the infrared detector 11, encoder 6, motor 5, infrared lens 3 are connected.
Certainly, thermal infrared imager of the present invention, in addition to power supply 9, memory 10 and image output unit 13.Power supply 9 can be
The active equipment of thermal infrared imager provides power supply；Memory 10 can be the various data in the imaging process of thermal infrared imager and figure
As being stored；Image output unit 13, can be that the various data in the imaging process of thermal infrared imager and image are exported
Display.
As an alternative embodiment, the master controller includes：
Infrared detecting unit, for being connected with the infrared detector, the exposure that analysis obtains the infrared detector is special
Property；
Switch support monitoring unit, be connected with the encoder, for receiving the encoder output, obtain described
Switch the current angular displacement information of support；
Motor control unit, is connected respectively with the motor, infrared detecting unit, for according to the infrared detecting unit
The exposure characteristic of the infrared detector obtained, and the switching support monitoring unit switching support that obtains are worked as
Preceding angular displacement information controls the rotation of the motor so that the shooting of optical filter on the switching support in the infrared lens
Time point appears on the light path center of the infrared lens exactly；
Infrared lens shooting unit, is connected with the infrared lens, for controlling the infrared lens respectively to filtered
Gas cloud background image is shot before and after piece filtering, obtains the gas cloud background image before and after filtered filtering；
Image fusion unit, is connected with the infrared lens shooting unit, for being obtained to the infrared lens shooting unit
Gas cloud background image before and after the filtered filtering obtained carries out fusion of imaging.
As an alternative embodiment, the master controller also includes time point setup unit, with the infrared spy
Unit connection is surveyed, for the exposure characteristic of the infrared detector obtained according to the infrared detecting unit, setting institute is calculated
State the shooting time point of infrared lens；
The motor control unit, is connected with the motor, time point setup unit, for being set according to the time point
The shooting time point of the infrared lens of unit setting, and the switching support that the switching support monitoring unit is obtained
Current angular displacement information control the rotation of the motor so that the optical filter on the switching support is according to the described red of setting
The shooting time point of outer camera lens is accurately appeared on the light path center of the infrared lens.
By the data processing of encoder 6, give motor 5 one curve controlled voltages, the torsion of motor 5 drives support 7 to rotate,
It is allowed to drive the optical filter 8 being arranged on support 7 accurately to appear in infrared lens 3 and infrared movement 1 according to the time point of setting
Between light path center on, and the time point set be the exposure characteristic by infrared detector to fitting, finally obtain one
The image of series fusion.
Beneficial effects of the present invention：By the way that shown in Fig. 5, the two images contrast before and after compensation deals, the present invention can be obtained
Than common gases leakage detection equipment direct imaging technology better image picture.
Algorithm and display be not inherently related to any certain computer, virtual system or miscellaneous equipment provided herein.
Various general-purpose systems can also be used together with based on teaching in this.As described above, construct required by this kind of system
Structure be obvious.In addition, the present invention is not also directed to any certain programmed language.It is understood that, it is possible to use it is various
Programming language realizes the content of invention described herein, and the description done above to language-specific is to disclose this hair
Bright preferred forms.
In the specification that this place is provided, numerous specific details are set forth.It is to be appreciated, however, that the implementation of the present invention
Example can be put into practice in the case of these no details.In some instances, known method, structure is not been shown in detail
And technology, so as not to obscure the understanding of this description.
Similarly, it will be appreciated that in order to simplify the disclosure and help to understand one or more of each inventive aspect, exist
Above in the description of the exemplary embodiment of the present invention, each feature of the invention is grouped together into single implementation sometimes
In example, figure or descriptions thereof.However, the method for the disclosure should be construed to reflect following intention：It is i.e. required to protect
The application claims of shield features more more than the feature being expressly recited in each claim.More precisely, such as following
Claims reflect as, inventive aspect is all features less than single embodiment disclosed above.Therefore,
Thus the claims for following embodiment are expressly incorporated in the embodiment, wherein each claim is in itself
All as the separate embodiments of the present invention.
Those skilled in the art, which are appreciated that, to be carried out adaptively to the module in the equipment in embodiment
Change and they are arranged in one or more equipment different from the embodiment.Can be the module or list in embodiment
Member or component be combined into a module or unit or component, and can be divided into addition multiple submodule or subelement or
Sub-component.In addition at least some in such feature and/or process or unit exclude each other, it can use any
Combination is disclosed to all features disclosed in this specification (including adjoint claim, summary and accompanying drawing) and so to appoint
Where all processes or unit of method or equipment are combined.Unless expressly stated otherwise, this specification (including adjoint power
Profit is required, summary and accompanying drawing) disclosed in each feature can or similar purpose identical, equivalent by offer alternative features come generation
Replace.
Although in addition, it will be appreciated by those of skill in the art that some embodiments in this include institute in other embodiments
Including some features rather than further feature, but not the combination of the feature of be the same as Example mean be in the scope of the present invention
Within and form different embodiments.For example, in the following claims, embodiment claimed it is any it
One mode can use in any combination.
The present invention all parts embodiment can be realized with hardware, or with one or more processor run
Software module realize, or realized with combinations thereof.It will be understood by those of skill in the art that can use in practice
Microprocessor or digital signal processor (DSP) are realized in gateway according to embodiments of the present invention, proxy server, system
Some or all parts some or all functions.The present invention is also implemented as being used to perform side as described herein
The some or all equipment or program of device (for example, computer program and computer program product) of method.It is such
Realizing the program of the present invention can store on a computer-readable medium, or can have the shape of one or more signal
Formula.Such signal can be downloaded from internet website and obtained, and either be provided or with any other shape on carrier signal
Formula is provided.
It should be noted that the present invention will be described rather than limits the invention for above-described embodiment, and ability
Field technique personnel can design alternative embodiment without departing from the scope of the appended claims.In the claims,
Any reference symbol between bracket should not be configured to limitations on claims.Word "comprising" is not excluded the presence of not
Element or step listed in the claims.Word "a" or "an" before element does not exclude the presence of multiple such
Element.The present invention can be by means of including the hardware of some different elements and coming real by means of properly programmed computer
It is existing.In if the unit claim of equipment for drying is listed, several in these devices can be by same hardware branch
To embody.Word, second and third use do not indicate that any order.These words can be construed to title.
Claims (8)
1. a kind of thermal infrared imager, it is characterised in that including：Pedestal and infrared movement on the pedestal, filter more
Piece switching mechanism and infrared lens, the infrared movement control many optical filter switching mechanisms enterprising in the light path of the infrared lens
Row switching, makes the infrared lens be shot respectively to the gas cloud background image before and after filtered filtering, and to described
Gas cloud background image before and after filtered filtering carries out fusion of imaging.
2. thermal infrared imager as claimed in claim 1, it is characterised in that many optical filter switching mechanisms include encoder,
Motor, switching support and installed in it is described switching support on multiple optical filters, the switching support respectively with encoder,
Motor connection；The encoder, motor are connected with the infrared movement respectively；The infrared movement is according to the defeated of the encoder
Go out signal, control the motor to drive the switching support rotation, make the optical filter being arranged on the switching support described
Switched in the light path of infrared lens.
3. thermal infrared imager as claimed in claim 2, it is characterised in that the infrared movement includes infrared detector, difference
The master controller being connected with the infrared detector, encoder, motor, infrared lens.
4. thermal infrared imager as claimed in claim 3, it is characterised in that the master controller includes：
Infrared detecting unit, for being connected with the infrared detector, analysis obtains the exposure characteristic of the infrared detector；
Switch support monitoring unit, be connected with the encoder, for receiving the encoder output, obtain the switching
The current angular displacement information of support；
Motor control unit, is connected respectively with the motor, infrared detecting unit, for being obtained according to the infrared detecting unit
The infrared detector exposure characteristic, and the switching support monitoring unit switching support that obtains works as anterior angle
Displacement information controls the rotation of the motor so that the shooting time of optical filter on the switching support in the infrared lens
Point is appeared on the light path center of the infrared lens exactly；
Infrared lens shooting unit, is connected with the infrared lens, for controlling the infrared lens respectively to filtered mistake
Gas cloud background image before and after filter is shot, and obtains the gas cloud background image before and after filtered filtering；
Image fusion unit, is connected with the infrared lens shooting unit, for what is obtained to the infrared lens shooting unit
Gas cloud background image before and after the filtered filtering carries out fusion of imaging.
5. thermal infrared imager as claimed in claim 4, it is characterised in that it is single that the master controller also includes time point setting
Member, is connected with the infrared detecting unit, for the exposure of the infrared detector obtained according to the infrared detecting unit
Characteristic, calculates the shooting time point of the setting infrared lens；
The motor control unit, is connected with the motor, time point setup unit, for according to the time point setup unit
The shooting time point of the infrared lens of setting, and the switching support monitoring unit switching support that obtains are worked as
Preceding angular displacement information controls the rotation of the motor so that optical filter on the switching support according to setting the infrared mirror
The shooting time point of head is accurately appeared on the light path center of the infrared lens.
6. thermal infrared imager as claimed in claim 2, it is characterised in that also including image output unit, with the main control
Device is connected, for carrying out image output display.
7. thermal infrared imager as claimed in claim 2, it is characterised in that also including memory, is connected with the master controller.
8. thermal infrared imager as claimed in claim 2, it is characterised in that also including power supply.
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Address after: 101300, No. two, 1 road, Shunyi Park, Zhongguancun science and Technology Park, Beijing, Shunyi District Patentee after: Beijing fujirui Optoelectronic Technology Co.,Ltd. Address before: 100085, Room 302, building 11, 4 Anning Road, Qinghe, Beijing, Haidian District Patentee before: BEIJING FJR OPTOELECTRONIC TECHNOLOGY Co.,Ltd. |
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