CN212781487U - Composite fluorescence microscope system for transferring nano materials - Google Patents
Composite fluorescence microscope system for transferring nano materials Download PDFInfo
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- CN212781487U CN212781487U CN202021010326.XU CN202021010326U CN212781487U CN 212781487 U CN212781487 U CN 212781487U CN 202021010326 U CN202021010326 U CN 202021010326U CN 212781487 U CN212781487 U CN 212781487U
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Abstract
The utility model discloses a compound fluorescence microsystem for nano-material shifts includes optical microscopy imaging device, numerical control horizontal migration platform, shock attenuation platform, target substrate controlling means, Z axle numerical control elevating gear, shifts substrate controlling means and controlling means. The utility model optimally designs the structure of the optical microscope imaging device and integrates the optical microscope imaging technology and the automation technology, thereby solving the problem of low two-dimensional material transfer precision in the field of nano material research; the utility model provides a compound fluorescence microsystem for nano-material shifts not only can improve two-dimensional material's transfer precision, realizes two-dimensional material's automatic transfer, is favorable to simplifying two-dimensional material's transfer operation, still helps breaking the limitation of the selection of base material when two-dimensional material prepares.
Description
Technical Field
The utility model relates to a nano-material shifts technical field, in particular to a compound fluorescence microsystem for nano-material shifts.
Background
The microscope is a tool for people to know the microscopic world, and plays a very important role in daily scientific research work in the fields of biomedicine, materials science, geology and the like. With the continuous and intensive research on the shape of the material, the size of the material involved in production and scientific research practice has reached the nanometer level, and particularly, the two-dimensional material represented by graphene, black scales and two-dimensional layered transition metal chalcogenide is a material in which electrons can only move freely on two dimensions of non-nanometer scale, that is, the electrons move on a plane. There are many common two-dimensional materials such as nano-films, superlattices, quantum wells, etc. Currently, two-dimensional materials can be prepared in both bottom-up and top-down approaches. In the bottom-up preparation method of the two-dimensional material, the chemical vapor deposition method relies on the reaction of certain organic or inorganic precursors on a catalytic substrate to prepare the two-dimensional material with large area and high quality, and is particularly suitable for high-end application in electronics or photonics; the top-down preparation method is based on that the lamellar block is stripped to obtain a single-layer or few-layer nanosheet of a corresponding two-dimensional material, particularly a method for directly stripping by utilizing ultrasonic waves, shearing force or electrochemical intercalation and the like in a liquid phase (such as a method for stripping the block material), can obtain a high-quality two-dimensional nanosheet in a large amount of colloid dispersion liquid, and can process the prepared two-dimensional nanosheet into forms of coatings, thin films, composite materials, mixtures and the like according to different purposes. However, both bottom-up and top-down fabrication methods require the transfer of the two-dimensional material, i.e., the separation of the two-dimensional material from the substrate or bulk material.
At present, the transfer method of the two-dimensional material is divided into dry transfer and wet transfer, wherein the wet transfer method is to immerse the substrate on which the two-dimensional material is grown in a corrosive solution, so that the substrate and the two-dimensional material are separated, and in the corrosion process, defects such as metal ions and chemical groups are inevitably introduced, so that the structure of the two-dimensional material is damaged, and the interface of the two-dimensional material is stained. Compared with a wet transfer method, the dry transfer method can ensure that the two-dimensional material has a complete macrostructure and a smooth microscopic size, and can repeatedly utilize a substrate for growing the two-dimensional material, so that the production cost is reduced. However, the conventional dry transfer method requires manual work for aligning the substrate to be transferred and the target substrate, and the light reflected on the target substrate needs to enter the microscope for observation through the substrate of the transferred material. Therefore, when a two-dimensional material is prepared, a substrate of a transferred material with good light transmittance needs to be selected, and the substrate of the transferred material should have sufficient strength and a thin thickness, which complicates a preparation process of the two-dimensional material and increases the preparation cost of the two-dimensional material. And a portion of the two-dimensional material is very close in color to the substrate, making it indistinguishable.
SUMMERY OF THE UTILITY MODEL
The present invention aims to provide a composite fluorescence microscope system for transferring nano materials, so as to solve the above technical problems.
In order to solve the technical problem, the utility model discloses a technical scheme does:
a composite fluorescence microscope system for transferring nano materials comprises an optical microscope imaging device, a numerical control horizontal moving platform, a damping platform, a target substrate control device, a Z-axis numerical control lifting device, a substrate transferring control device and a control device, wherein the optical microscope imaging device, the numerical control horizontal moving platform, the damping platform, the target substrate control device, the Z-axis numerical control lifting device and the substrate transferring control device are all electrically connected with the control device; the optical microscopic imaging device comprises an illumination component, an objective lens, a lens barrel, a digital camera, a relay lens, an imaging lens, a two-way spectroscope and a reflective mirror, wherein the relay lens, the imaging lens, the two-way spectroscope and the reflective mirror are sequentially arranged in the lens barrel; the illumination assembly comprises a shell, the shell is arranged on the side wall of the lens barrel and is communicated with the lens barrel, and an illumination light source, a first light source condensing lens and a second light source condensing lens are sequentially arranged in the shell; the number of the optical microscopic imaging devices is two, the two optical microscopic imaging devices are symmetrically arranged, and the optical centers of the objective lenses of the two optical microscopic imaging devices are on the same straight line; the light emitted by the illumination light source sequentially passes through the first light source condenser lens and the second light source condenser lens and then is reflected into the reflector by the dichroic beam splitter, and then is reflected into the objective lens by the reflector; the numerical control horizontal moving platform is arranged on the damping platform, and the optical microscopic imaging device is arranged on the numerical control horizontal moving platform; the target substrate control device is arranged on the damping platform and comprises a first objective table, a numerical control heating table and a laser displacement sensor, wherein the numerical control heating table and the laser displacement sensor are arranged on the first objective table, and the first objective table of the first objective table is used for bearing a target substrate; the Z-axis numerical control lifting device is arranged on the damping platform; the target substrate control device is positioned between the numerical control horizontal moving platform and the Z-axis numerical control lifting device; the transfer substrate control device is fixed on the Z-axis numerical control lifting device and comprises a second objective table, wherein the second objective table is used for bearing a transfer substrate, and a two-dimensional material grows on the transfer substrate.
As the preferred scheme of the utility model, the casing with intercommunication department between the lens cone is provided with first optical lens, be provided with second optical lens in the lens cone, second optical lens is located between imaging lens and the two-way spectroscope.
Further, the illuminating light source is monochromatic light LED lamp beads, the first optical lens is a fluorescence emission sheet, the second optical lens is a fluorescence excitation sheet, and the two-way spectroscope is a two-way dichroic mirror.
Further, the illumination light source is a white mixed light LED lamp bead, the first optical lens is a polarizing film, the second optical lens is a polarizing film, the polarization directions of the first optical lens and the second optical lens are mutually orthogonal, and the two-way spectroscope is a semi-reflecting and semi-transmitting spectroscope.
As the utility model discloses a preferred scheme, target substrate controlling means still includes first X-Y axial numerical control moving platform, the accurate revolving stage of first numerical control, Z axle numerical control lift platform set up in on the shock attenuation platform, first X-Y axial numerical control moving platform set up in on the Z axle numerical control lift platform, the accurate revolving stage of first numerical control set up in first X-Y axial numerical control moving platform, first objective table set up in on the accurate revolving stage of first numerical control.
As an optimized scheme of the utility model, it still includes second X-Y axial numerical control moving platform, the accurate revolving stage of second numerical control still to shift substrate controlling means, second X-Y axial numerical control moving platform is fixed in through the support frame on the Z axle numerical control elevating gear, the accurate revolving stage of second numerical control set up in on the second X-Y axial numerical control moving platform, the second objective table set up in on the accurate revolving stage of second numerical control.
As the utility model discloses an optimal scheme, controlling means includes host computer, display, the display with host computer electric connection, optical microscopic imaging device, numerical control horizontal migration platform, shock attenuation platform, target substrate controlling means, Z axle numerical control elevating gear, transfer substrate controlling means all with controlling means's host computer electric connection.
Furthermore, the control device further comprises an instruction input device electrically connected with the host.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the utility model optimally designs the structure of the optical microscope imaging device and integrates the optical microscope imaging technology and the automation technology, thereby solving the problem of low two-dimensional material transfer precision in the field of nano material research; the utility model provides a compound fluorescence microsystem for nano-material shifts not only can improve two-dimensional material's transfer precision, realizes two-dimensional material's automatic transfer, is favorable to simplifying two-dimensional material's transfer operation, still helps breaking the limitation of the selection of base material when two-dimensional material prepares.
Drawings
The following describes the present invention with reference to the accompanying drawings. It is to be noted herein that the accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, together with the description of the embodiments of the invention for the purpose of illustration and not for the purpose of limitation.
Fig. 1 is a schematic structural diagram of a composite fluorescence microscope system for nanomaterial transfer provided by the present invention;
fig. 2 is a schematic structural diagram of the optical microscopic imaging apparatus provided by the present invention.
In the figure, 1-an optical microscopic imaging device, 11-an illumination assembly, 111-a shell, 112-an illumination light source, 113-a first light source condenser lens, 114-a second light source condenser lens, 115-a first optical lens, 12-an objective lens, 13-a lens cone, 14-a digital camera, 15-a relay lens, 16-an imaging lens, 17-a second optical lens, 18-a dichroic mirror, 19-a reflector, 2-a numerical control horizontal moving platform, 3-a shock absorption platform, 4-a target substrate control device, 41-a first objective table, 42-a first X-Y axial numerical control moving platform, 43-a first numerical control precision rotating table, 44-a numerical control heating table, 45-Z axial numerical control lifting platform and 5-Z axial numerical control lifting device, 6-a control device for transferring a substrate, 61-a second objective table, 62-a second X-Y axial numerical control moving platform, 63-a second numerical control precision rotating table, 7-a control device, 71-a host computer and 72-a display.
Detailed Description
The following describes the present invention with reference to the accompanying drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features related to the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1, the utility model provides a compound fluorescence microsystem for nano-material shifts includes optical microscope imaging device 1, numerical control horizontal migration platform 2, shock attenuation platform 3, target substrate controlling means 4, Z axle numerical control elevating gear 5, shifts substrate controlling means 6 and controlling means 7, optical microscope imaging device 1, numerical control horizontal migration platform 2, shock attenuation platform 3, target substrate controlling means 4, Z axle numerical control elevating gear 5, shift substrate controlling means 6 all with controlling means 7 electric connection.
The optical microscopic imaging device 1 comprises an illumination component 11, an objective lens 12, a lens barrel 13, a digital camera 14, a relay lens 15, an imaging lens 16, a dichroic beam splitter 18 and a reflective mirror 19, wherein the relay lens 15, the imaging lens 16, the dichroic beam splitter 18 and the reflective mirror 19 are sequentially arranged in the lens barrel 13, the digital camera 14 is arranged on the lens barrel 13 and is positioned at one side far away from the reflective mirror 19, the objective lens 12 and the illumination component 11 are both arranged on the side wall of the lens barrel 13, the objective lens 12 is positioned at one side near the reflective mirror 12, and both the dichroic beam splitter 18 and the reflective mirror 12 are inclined by 45 degrees relative to the axis of the lens barrel 13; the illumination assembly 11 includes a housing 111, the housing 111 is disposed on a side wall of the lens barrel 13 and is communicated with the lens barrel 13, and an illumination light source 112, a first light source condenser lens 113, and a second light source condenser lens 114 are sequentially disposed in the housing 111; the number of the optical microscopic imaging devices 1 is two, the two optical microscopic imaging devices 1 are symmetrically arranged, and the optical centers of the objective lenses 12 of the two optical microscopic imaging devices 1 are on the same straight line. The light emitted by the illumination light source 112 passes through the first light source condenser lens 113 and the second light source condenser lens 114 in sequence, is reflected into the reflective mirror 19 by the dichroic beam splitter 18, and is reflected into the objective lens 12 by the reflective mirror 19, the imaging light received by the objective lens 12 emits the imaging light into the reflective mirror 19, and is transmitted into the imaging lens 14 by the dichroic beam splitter 17, and is imaged on the digital camera 14 by the relay lens 13.
The optical microscope imaging device comprises a numerical control horizontal moving platform 2, wherein the numerical control horizontal moving platform 2 is arranged on a damping platform 3, and an optical microscope imaging device 1 is arranged on the numerical control horizontal moving platform 2.
Target substrate controlling means 4 includes first objective table 41, a X-Y axial numerical control moving platform 42, a first numerical control precision rotation platform 43, Z axle numerical control lift platform 45, numerical control heating platform 44 and laser displacement sensor (not shown in the figure), Z axle numerical control lift platform 45 set up in on the shock attenuation platform 3, a X-Y axial numerical control moving platform 42 set up in on the Z axle numerical control lift platform 45, a numerical control precision rotation platform 43 set up in a X-Y axial numerical control moving platform 42, numerical control heating platform 44 set up in a first numerical control precision rotation platform 43, first objective table 41 set up in on the numerical control heating platform 44, first objective table 41 is used for bearing the target substrate.
The Z-axis numerical control lifting device 5 is arranged on the damping platform 3.
The target substrate control device 4 is positioned between the numerical control horizontal moving platform 2 and the Z-axis numerical control lifting device 5.
The substrate transferring control device 6 comprises a second object stage 61, a second X-Y axial numerical control moving platform 62 and a second numerical control precise rotating platform 63, wherein the second object stage 61 is used for bearing and transferring the substrate, two-dimensional materials grow on the transferred substrate, the second X-Y axial numerical control moving platform 62 is fixed on the Z-axis numerical control lifting device 5 through a support frame, the second numerical control precise rotating platform 63 is arranged on the second X-Y axial numerical control moving platform 62, and the second object stage 61 is arranged on the second numerical control precise rotating platform 63.
The control device 7 includes a host 71, a display 72 and a command input device (not shown), the command input device is a keyboard, and the display 72 and the command input device are electrically connected to the host 71.
Specifically, a first optical lens 115 is disposed at a communication position between the housing 111 and the lens barrel 13, a second optical lens 17 is disposed in the lens barrel 13, and the second optical lens 17 is located between the image forming lens 16 and the dichroic beam splitter 18.
Further, light source 112 is monochromatic light LED lamp pearl, first optical lens 115 is the fluorescence emission piece, second optical lens 17 is the fluorescence excitation piece, two-way spectroscope 18 is two-way dichroic mirror, the utility model discloses alright realize fluorescence illumination observation mode.
Further, light source 112 is white mixed light LED lamp pearl, first optical lens 115 is the polaroid, second optical lens 17 is the polaroid, the polarization direction mutual quadrature of first optical lens 115 and second optical lens 17, two to spectroscope 18 is half reflection semi-permeable spectroscope, the utility model discloses alright realize the polarisation observation mode.
Specifically, the objective lens 12 is an infinite-beam objective lens, the magnification is 1-100 x, the parfocal distance of the objective lens 12 is preferably 45mm, and the objective lens 12 with the parfocal distance of 45mm makes the occupied space of the device smaller and the thread size is the national standard RMS (root mean square) compared with objective lens products with the parfocal distances of 95mm and 60 mm. The utility model discloses a lens cone, relay lens 15, imaging lens 16, reflector 19 and objective 12 constitute the microscopic imaging system's of infinity optics project organization.
Specifically, the digital camera 14 is a high-sensitivity CMOS camera, which is beneficial to improving the imaging quality under the condition of controlling the cost, and the optical interface is an industry standard interface C-type interface.
The working principle of the utility model is as follows:
in use, the main machine 71 of the control device 7 controls the numerical control horizontal moving platform 2 to move in the horizontal direction, so that the objective lens 12 of the optical microscopic imaging device 1 moves between the target substrate control device 4 and the transfer substrate control device 6.
The utility model discloses accessible host computer 71 control second X-Y axial numerical control moving platform 62 starts, make the transfer substrate on the second objective table 61 remove in X axle direction and Y axle direction, the two-dimensional material that until shifting the substrate is in objective 12's field of vision central point puts, acquire the image of the two-dimensional material on the transfer substrate and reach controlling means 7's host computer 71 on the image that will acquire through optical microscope imaging device 1, host computer 71 carries out image processing to this image and sends the image after handling to display 72, the image real-time display of the two-dimensional material after handling is on display 72, the staff can observe the two-dimensional material on the transfer substrate in real time.
The utility model discloses the Z axle numerical control lift platform 45 of still accessible host computer 71 control target substrate controlling means 4 goes up and down in the Z axle direction, it is clear to focus until the target substrate, image transmission to host computer 71 that will acquire through optical microscope imaging device 1 the image of target substrate, host computer 71 carries out image processing to this image and sends the image after handling to display 72, thereby make display 72 show the image of target substrate simultaneously and the image of the two-dimensional material that needs the transfer, make things convenient for the staff to observe directly perceivedly whether the two-dimensional material that needs the transfer aligns with the target substrate in laminating position and direction. If not align, the utility model discloses accessible controlling means 7 starts accurate revolving stage of numerical control and first X-Y axial numerical control moving platform 42, makes the two-dimensional material that needs the transfer rotatory, remove under the drive of accurate revolving stage of numerical control and first X-Y axial numerical control moving platform 42, aligns with the target substrate until the two-dimensional material that needs the transfer.
After alignment, the utility model moves the numerical control horizontal moving platform 2 in the horizontal direction under the control of the host 71 of the control device 7, so that the objective 12 of the optical microscopic imaging device 1 is moved away from the target substrate control device 4 and the transfer substrate control device 6, then under the control of the host 71 of the control device 7, the Z-axis numerical control lifting device 5 drives the transfer substrate to approach the target substrate control device 4 in the Z-axis direction, the laser displacement sensor at one side of the target substrate can acquire the distance information between the transfer substrate and the target substrate and transmit the measured distance information to the host 71 of the control device 7, the host 71 displays the received distance information on the display 72 in the form of numerical value, when the distance value received by the host 71 reaches the preset distance value, the host 71 is triggered to close the Z-axis numerical control lifting device 5, so that the transfer substrate control device 6 stops moving, the two-dimensional material on the transfer substrate is contacted with the target substrate; then, the numerical control heating table 44 is controlled by the host 71 to heat the target substrate, after the heating process is finished, the Z-axis numerical control lifting device 5 is restarted by the host 71, and the Z-axis numerical control lifting device 5 drives the transfer substrate control device 6 to ascend and reset; under the control of the host 71 of the control device 7, the numerical control horizontal moving platform 2 drives the optical microscopic imaging device 1 to move horizontally until the objective lens 13 moves between the target substrate control device 4 and the transfer substrate control device 6, so as to detect whether the two-dimensional material is transferred from the transfer substrate to the target substrate.
The utility model provides a compound fluorescence microscopic system for nano-material shifts can improve the transfer precision of two-dimensional material, simplifies the transfer operation of two-dimensional material simultaneously, helps breaking the limitation of the selection of base material when the two-dimensional material is prepared, realizes the automatic transfer of two-dimensional material; the utility model discloses optical microscopic imaging technique and automation technology have been assembled to the problem that the two-dimensional material that solves nano-material research field shifts the precision low is optimized and designed optical microscope imaging device's structure, still accessible realize bright field, polarisation, the microscopic imaging observation mode of three kinds of differences of fluorescence, selected formation of image objective need not overlength working distance objective, use conventional objective can, both can reduce cost, also can provide the imaging resolution ratio. The whole system is integrated, simplified and lower in cost.
It should be noted that, in the embodiment of the present invention, all the directional indicators (such as the upper … … and the lower … …) are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the principles and spirit of the invention, and the scope of the invention is to be accorded the full scope of the claims.
Claims (8)
1. A composite fluorescence microscope system for transferring nano materials is characterized by comprising an optical microscope imaging device, a numerical control horizontal moving platform, a damping platform, a target substrate control device, a Z-axis numerical control lifting device, a transfer substrate control device and a control device, wherein the optical microscope imaging device, the numerical control horizontal moving platform, the damping platform, the target substrate control device, the Z-axis numerical control lifting device and the transfer substrate control device are electrically connected with the control device; the optical microscopic imaging device comprises an illumination component, an objective lens, a lens barrel, a digital camera, a relay lens, an imaging lens, a two-way spectroscope and a reflective mirror, wherein the relay lens, the imaging lens, the two-way spectroscope and the reflective mirror are sequentially arranged in the lens barrel; the illumination assembly comprises a shell, the shell is arranged on the side wall of the lens barrel and is communicated with the lens barrel, and an illumination light source, a first light source condensing lens and a second light source condensing lens are sequentially arranged in the shell; the number of the optical microscopic imaging devices is two, the two optical microscopic imaging devices are symmetrically arranged, and the optical centers of the objective lenses of the two optical microscopic imaging devices are on the same straight line; the light emitted by the illumination light source sequentially passes through the first light source condenser lens and the second light source condenser lens and then is reflected into the reflector by the dichroic beam splitter, and then is reflected into the objective lens by the reflector; the numerical control horizontal moving platform is arranged on the damping platform, and the optical microscopic imaging device is arranged on the numerical control horizontal moving platform; the target substrate control device is arranged on the damping platform and comprises a first objective table, a numerical control heating table and a laser displacement sensor, wherein the numerical control heating table and the laser displacement sensor are arranged on the first objective table, and the first objective table of the first objective table is used for bearing a target substrate; the Z-axis numerical control lifting device is arranged on the damping platform; the target substrate control device is positioned between the numerical control horizontal moving platform and the Z-axis numerical control lifting device; the transfer substrate control device is fixed on the Z-axis numerical control lifting device and comprises a second objective table, wherein the second objective table is used for bearing a transfer substrate, and a two-dimensional material grows on the transfer substrate.
2. The composite fluorescence microscopy system for nanomaterial transfer of claim 1, wherein a first optical lens is disposed at a communication between the housing and the lens barrel, and a second optical lens is disposed in the lens barrel and is located between the imaging lens and the dichroic beam splitter.
3. The composite fluorescence microscope system for nanomaterial transfer of claim 2, wherein the illumination light source is a monochromatic light LED lamp bead, the first optical lens is a fluorescence emission plate, the second optical lens is a fluorescence excitation plate, and the dichroic beam splitter is a dichroic mirror.
4. The composite fluorescence microscope system for nanomaterial transfer of claim 2, wherein the illumination source is a white mixed light LED lamp bead, the first optical lens is a polarizing plate, the second optical lens is a polarizing plate, the polarization directions of the first optical lens and the second optical lens are mutually orthogonal, and the dichroic beam splitter is a semi-reflecting and semi-transmitting beam splitter.
5. The composite fluorescence microscopy system for nanomaterial transfer of claim 1, wherein the target substrate control device further comprises a first X-Y axial numerically controlled motion stage, a first numerically controlled precision rotation stage, and a Z axial numerically controlled lift stage, the Z axial numerically controlled lift stage being disposed on the shock absorbing stage, the first X-Y axial numerically controlled motion stage being disposed on the Z axial numerically controlled lift stage, the first numerically controlled precision rotation stage being disposed on the first X-Y axial numerically controlled motion stage, the first stage being disposed on the first numerically controlled precision rotation stage.
6. The composite fluorescence microscopy system for nanomaterial transfer of claim 1, wherein the substrate transfer control device further comprises a second X-Y axial numerically controlled moving platform and a second numerically controlled precision rotation stage, the second X-Y axial numerically controlled moving platform is fixed on the Z-axis numerically controlled lifting device through a support frame, the second numerically controlled precision rotation stage is arranged on the second X-Y axial numerically controlled moving platform, and the second object stage is arranged on the second numerically controlled precision rotation stage.
7. The composite fluorescence microscopy system for nanomaterial transfer of claim 1, wherein the control device comprises a host and a display, the display is electrically connected with the host, and the optical microscopy imaging device, the numerical control horizontal moving platform, the damping platform, the target substrate control device, the Z-axis numerical control lifting device and the transfer substrate control device are electrically connected with the host of the control device.
8. The composite fluorescence microscopy system for nanomaterial transfer of claim 7, wherein the control device further comprises an instruction input electrically connected to the host.
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| CN111624758A (en) * | 2020-06-04 | 2020-09-04 | 广州浩康生物科技有限公司 | Composite fluorescence microscope system for transferring nano materials |
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