CN217110927U - Conversion fluorescence vortex detection device in water area - Google Patents
Conversion fluorescence vortex detection device in water area Download PDFInfo
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- CN217110927U CN217110927U CN202123070096.3U CN202123070096U CN217110927U CN 217110927 U CN217110927 U CN 217110927U CN 202123070096 U CN202123070096 U CN 202123070096U CN 217110927 U CN217110927 U CN 217110927U
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Abstract
The utility model discloses a change fluorescence vortex detection device on waters installs on the navigation ware, include: the device comprises a shell, a laser emitter, a nano-particle storage bin and an image acquisition and processing system, wherein the laser emitter, the nano-particle storage bin and the image acquisition and processing system are packaged in the shell and are sequentially arranged from top to bottom; the laser emitter and the nanoparticle storage bin are connected with the image acquisition and processing system, and the laser emitter is used for emitting infrared laser to the direction to be detected for irradiation; the nano particle storage bin is used for emitting the projectile filled with the hydrophilic up-conversion nano powder to the detection direction, the projectile is exploded in a designated area and releases up-conversion nano particles, the up-conversion nano particles are positioned in the irradiation range of infrared laser, the up-conversion nano particles emit visible light under the excitation of infrared laser beams and present optical images, and the image acquisition and processing system is used for acquiring optical image data and judging the turbulence condition of a water area through processing and displaying.
Description
Technical Field
The utility model relates to a waters torrent detects technical field, particularly, especially relates to a fluorescence vortex detection device changes in waters.
Background
The turbulence is a special area with local non-uniform distribution of seawater density and concentration commonly existing in ocean lakes, and the scale of the turbulence is widely distributed from millimeter magnitude to tens of kilometers magnitude. The change of the ocean turbulence in a small range and a short time is rapid and random, and for a non-dragging aircraft, once the non-dragging aircraft encounters a torrent environment, the non-dragging aircraft is easy to be damaged by violent collision with hard objects such as an underwater reef. Therefore, detection of water area turbulence is achieved, and the method has great significance for adjusting the advancing course in time and improving the navigation safety and stability of the underwater vehicle, particularly the non-dragging intelligent underwater vehicle.
At present, the detection of the water area environment target is mainly realized by ultra-long wave detection and sound wave detection. However, the ultra-long wave detection system has the disadvantages of complexity, large power consumption, narrow pass band and the like, and the disadvantages of low sound wave transmission speed, long delay, serious doppler dispersion, poor security and the like are also inevitable. Under the background, the underwater optical detection mode provides a new idea for the detection technology. At present, the research aiming at the underwater turbulence optical detection is mainly vortex beam detection and particle imaging technology. Through analysis, the common problem of the foregoing optical detection methods is that the emitting device of the detection signal and the receiving device of the feedback signal must be distributed in different directions of the detected area, and cannot be installed on the same carrier (e.g., an aircraft), and therefore, the optical detection methods cannot be applied to an aircraft body and complete real-time autonomous detection and risk avoidance. In addition, in the existing optical detection process, optical accessories such as a reflector and the like are required to change the propagation direction of the light beam for many times, and the required equipment is large in size and low in detection sensitivity.
SUMMERY OF THE UTILITY MODEL
According to the defects of complex system, large power consumption, narrow passband and the like in the superlong wave detection, the defects of low transmission speed, long delay, serious Doppler frequency dispersion, poor confidentiality and the like in the sound wave detection, and the technical problems of huge equipment volume, different real-time signal transmission and information receiving and different bodies in the water turbulence detection of an optical detection method, the device for detecting the converted fluorescence vortex on the water is provided. The utility model discloses mainly arouse the luminous particle realization of upconversion through infrared laser instrument "the torrent is visual to carry out image acquisition and contrastive analysis to waters self-luminous optical image.
The utility model discloses a technical means as follows:
a fluorescence vortex detection device in water, mounted on an aircraft, comprising: the device comprises a shell, a laser emitter, a nanoparticle storage bin and an image acquisition and processing system, wherein the laser emitter, the nanoparticle storage bin and the image acquisition and processing system are packaged in the shell and are sequentially arranged from top to bottom;
the laser emitter and the nanoparticle storage bin are both connected with an image acquisition and processing system, and the laser emitter is used for emitting infrared laser to the direction to be detected for irradiation; the nanoparticle storage bin is used for emitting a projectile filled with hydrophilic upconversion nano powder to a detection direction, the projectile is exploded in a designated area to release upconversion nanoparticles, the upconversion nanoparticles are positioned in an irradiation range of infrared laser, and the upconversion nanoparticles emit visible light and present an optical image under the excitation of infrared laser beams; the image acquisition and processing system is used for acquiring optical image data, and judging the turbulence condition of a water area through processing and displaying.
Furthermore, the image acquisition processing system comprises an image acquisition module, an image processing module and an image display module, wherein the image acquisition module is simultaneously connected with the laser emitter and the nanoparticle storage bin and is used for acquiring optical image data; the image processing module is respectively connected with the image acquisition module and the image display module through network cables and is used for receiving the original optical image data acquired by the image acquisition module, carrying out image enhancement processing on the original optical image data and transmitting the processed image to the image display module for display.
Further, the nanoparticle storage bin is disposed 1cm from the top of the housing.
Further, the laser emitter is arranged 1.5cm under the nanoparticle storage bin, emits infrared laser at a depression angle of 5 degrees, and expands the beam through the arranged beam expander.
Further, the image acquisition processing system is arranged at a position 2cm below the laser transmitter, and the distance between the image acquisition processing system and the bottom of the shell is 1 cm.
Furthermore, the image acquisition and processing system adopts an integrated hardware acquisition and processing design scheme, the image acquisition and processing tasks are realized by the same hardware board card, the data exchange between the two is realized by an on-board bus (or other data communication modes such as FIFO (first in first out), double RAM (random access memory) alternation and the like), the image acquisition is completed by a special digital conversion module, the image processing is realized by a special DSP (or DSP array) module, and the modules adopt a tight coupling integrated design.
Furthermore, the image processing module performs enhancement processing on the optical image by using a cable operator based on a motion compensation principle.
Further, the infrared laser emitted by the laser emitter is 808nm infrared laser.
Further, the upconversion nanopowder includes, but is not limited to, NaYF 4 :Nd 3+ ,Yb 3+ ,Er 3+ @NaYF 4 :Nd 3 + @SiO 2 、NaGdF 4 :Yb 3+ ,Er 3+ @NaGdF 4 @PDAs、BaGdF 4 :Yb 3+ ,Er 3+ 、NaYF 4 :Yb 3+ ,Er 3+ @NaYF 4 :Yb 3+ ,Nd 3+ @PDAs、NaYbF 4 :Er 3+ @NaYbF 4 :Tm 3+ @NaYF 4 、NaYF 4 :Yb 3+ ,Tm 3+ @CaF 2 、NaYF 4 :Yb 3+ ,Tm 3+ ,Ce 3+ 、NaLuF 4 :Yb 3+ ,Tm 3+ ,Er 3+ 、NaLuF 4 :Yb 3+ ,Tm 3+ Or Gd 2 O 3 :Yb 3+ ,Ho 3+ And the like.
Furthermore, the modulation of different color lights and different luminous intensities in the visible light range can be realized by adjusting the doping ion species and the doping concentration ratio of the up-conversion nano powder.
The utility model also provides a detection method of conversion fluorescence vortex detection device on waters, including following step:
firstly, a laser emitter carried by an aircraft emits infrared laser at a depression angle of 5 degrees to a direction to be detected for irradiation;
step two, at the same time, a nanoparticle storage bin of the aircraft emits a projectile filled with hydrophilic upconversion nano powder to the direction to be detected, the projectile is exploded in a designated area, and upconversion nanoparticles are released;
thirdly, emitting visible light by the up-conversion nano particles under the excitation of the infrared laser beam to present an optical image;
fourthly, an image acquisition and processing system carried by the aircraft acquires optical images, and the optical images are processed to judge the turbulence condition of the water area; after the laser emitter and the nanoparticle storage bin emit laser searchlighting and up-conversion nano powder projectiles at the same time, the image acquisition module is triggered to acquire optical image data, the optical image data are transmitted to the image processing module, and the image processing module transmits the optical image data to the image display module for displaying after image enhancement processing is carried out on the optical image data.
Further, in the first step, a method for irradiating the laser emitter carried by the aircraft by emitting infrared laser to the direction to be detected includes: when the aircraft moves to an unknown water area, a laser emitter carried by the aircraft emits 808nm infrared laser at a depression angle of 5 degrees to the direction to be detected, and the infrared laser irradiates forwards after beam expansion.
Further, in the second step, the nanoparticle storage bin of the aircraft emits a projectile loaded with hydrophilic upconversion nanopowder in the direction to be detected, and the method for releasing upconversion nanoparticles by blasting the projectile in the designated area includes: and (3) launching the projectile filled with the hydrophilic upconversion nano powder to the direction to be detected by a nano particle storage bin of the aircraft, blasting the projectile in a designated area, releasing the upconversion nano particles, and rapidly diffusing in the designated area to form sol.
Further, in the third step, the upconversion nanoparticles emit visible light under excitation of the infrared laser beam, and the method for presenting an optical image includes: the up-conversion nano particles emit different color lights under the excitation of 808nm infrared laser beams, and the modulation of different color lights and different luminous intensities in a visible light range can be realized by adjusting the doping ion species and the doping concentration ratio of the up-conversion nano powder; the vortex structure generated by the turbulence effect carries the up-conversion nano particles to form random spatial distribution, and a stable distribution state can be formed in a still water environment, so that the distribution state of the nano colloid particles can present a static or dynamic optical image to reflect the water vortex structure.
Further, in the fourth step, the method for determining the turbulence of the water area by processing the optical image acquired by the image acquisition and processing system carried by the aircraft includes: the optical image is a self-luminous phenomenon, the image acquisition module carried by an aircraft acquires the optical image of the nano colloidal particles in the unknown water area state, the image processing module performs enhancement processing on the optical image by using a soluble operator based on the motion compensation principle, and the optical image distribution condition of the still water environment in an image database is compared after the optical image is displayed by the image display module to judge the turbulence degree of the water body.
Compared with the prior art, the utility model has the advantages of it is following:
1. the utility model provides a waters up-conversion fluorescence vortex detection device through to the up-conversion nano particles gather and handle the analysis along with the spontaneous light image of specificity that vortex rivers presented, can reach signalling-receiving arrangement "integration" and torrent "visual" purpose under water, solves the problem that ubiquitous detecting system signalling and receiving arrangement are different, feedback signal are difficult to transmit to navigation equipment body among the existing technology.
2. The utility model provides a conversion fluorescence vortex detection device on waters through adopting hydrophilic type to go up the conversion nano particle as luminescent material, utilizes its good monodispersity in the water, helps improving torrent "visual" imaging's accuracy and sensitivity.
3. The utility model provides a conversion fluorescence vortex detection device on waters, the absorption spectrum of comprehensive consideration water through selecting conversion luminescence mechanism on the combination of "808 nm arouses-550 nm transmission", reduces light loss in the at utmost, helps improving the stability of optical detection technique under water, strengthens its detectability.
To sum up, use the technical scheme of the utility model the detecting system signalling that can solve current optical detection technique under water exists is different with receiving arrangement, feedback signal be difficult to transmit to navigation equipment body, detecting device bulky, the detection means is complicated, detectivity is lower problem.
Based on the reason, the utility model discloses can extensively promote in fields such as boats and ships, waters navigation ware.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a diagram of the vortex detection integrated device of the present invention.
Fig. 2 is a schematic view of the flow of the detection method of the present invention.
Fig. 3 is a TEM image of the core nanoparticles of the present invention.
Fig. 4 is a TEM image of the core-shell nanoparticles of the present invention.
Fig. 5 is a luminescence intensity spectrum of the core-shell nanoparticle of the present invention.
Fig. 6 is a diagram of the energy level of the core-shell nanoparticles of the present invention.
Fig. 7 is a TEM image of the core-shell nanoparticles of the present invention after hydrophilic modification.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1
As shown in fig. 1, the utility model provides a fluorescence vortex detection device of conversion on waters is a fluorescence vortex detection device of conversion on waters based on luminous and optics principle of up-conversion, installs on the navigation ware, stores storehouse and image acquisition processing system including shell, laser emitter, nanoparticle. The image acquisition processing system comprises an image acquisition module, an image processing module and an image display module.
The laser transmitter is connected with the image acquisition module and emits infrared laser to the direction to be detected for irradiation.
The nano-particle storage bin is connected with the image acquisition module, and is used for launching the projectile filled with the hydrophilic upconversion nano-powder to the detection direction, and the projectile is exploded in the designated area to release upconversion nano-particles.
After the laser emitter and the nanoparticle storage bin simultaneously emit laser searchlighting and the upconversion nano powder projectile, the image acquisition module is triggered to acquire optical image data presented by visible light emitted by the upconversion nanoparticles under the excitation of the infrared laser beam.
One end of the image processing module is connected with the image acquisition module through a network cable and is used for receiving original optical image data and carrying out image enhancement processing on the original optical image data; the other end is connected with the image display module, and the processed image is transmitted to the image display module to be displayed.
The installation positions of the image acquisition and processing system, the laser emitter and the nanoparticle storage bin are as follows:
the nano particle storage bin, the laser emitter and the image acquisition processing system are packaged in the same shell to form an integrated vortex detection device, and the nano particle storage bin, the laser emitter and the image acquisition processing system are sequentially arranged on the same vertical line from top to bottom. The specific location information and design factors are as follows:
considering that the up-conversion nano powder particles are influenced by gravity in the water area environment and the action that local aggregation may occur under the internal vortex action of fluid exists, the nano particle storage bin is arranged at the uppermost part and is 1cm away from the top of the upper shell of the shell. And a 808nm laser transmitter is arranged at a position 1.5cm under the nanoparticle storage bin, emits infrared laser at a depression angle of 5 degrees, and expands the beam through a beam expander. Considering that the high power of the emergent laser possibly causes certain influence on the image acquisition processing system, the image acquisition processing system is arranged 2cm under the laser transmitter to acquire data of self-luminous imaging of the upper-mounted and replaceable nano particles under infrared irradiation, and the distance between the image acquisition processing system and the bottom of the lower shell of the shell is 1 cm.
Example 2
As shown in fig. 2, based on embodiment 1, the present invention provides a detection method of a fluorescence vortex detection device in water area, comprising the following steps performed in sequence:
1) and a laser emitter carried by the aircraft emits infrared laser to the direction to be detected for irradiation.
2) A bullet cabin (nanoparticle storage cabin) arranged in the aircraft emits a bullet filled with hydrophilic upconversion nano powder to a detection direction, and the bullet explodes in a designated area to release upconversion nanoparticles.
3) The up-conversion nano particles emit visible light under the excitation of the infrared laser beam to present an optical image.
4) An image acquisition and processing system carried by the aircraft acquires optical images, and the optical images are processed to judge the turbulence condition of the water area.
In the present embodiment, the method for irradiating the laser beam emitted in the direction to be detected by the laser emitter mounted on the aircraft in step 1) includes: when the aircraft moves to an unknown water area, a laser emitter carried by the aircraft emits 808nm infrared laser to a direction to be detected, and the infrared laser irradiates forwards after beam expansion.
In this embodiment, the method for launching the projectile loaded with the hydrophilic upconversion nano powder to the detection direction by the internal magazine of the aircraft in the step 2), wherein the method for releasing the upconversion nano particles by the projectile is as follows: and launching the projectile filled with the hydrophilic upconversion nano powder to the direction to be detected by the built-in magazine of the aircraft, wherein the projectile is exploded in a designated area to release upconversion nano particles and quickly diffuse in the designated area to form sol. The upconversion nanopowder includes but is not limited to NaYF 4 :Nd 3+ ,Yb 3+ ,Er 3+ @NaYF 4 :Nd 3+ @SiO 2 、NaGdF 4 :Yb 3+ ,Er 3+ @NaGdF 4 @PDAs、BaGdF 4 :Yb 3+ ,Er 3+ 、NaYF 4 :Yb 3+ ,Er 3+ @NaYF 4 :Yb 3+ ,Nd 3+ @PDAs、NaYbF 4 :Er 3+ @NaYbF 4 :Tm 3+ @NaYF 4 、NaYF 4 :Yb 3+ ,Tm 3+ @CaF 2 、NaYF 4 :Yb 3+ ,Tm 3+ ,Ce 3+ 、NaLuF 4 :Yb 3+ ,Tm 3+ ,Er 3+ 、NaLuF 4 :Yb 3+ ,Tm 3+ Or Gd 2 O 3 :Yb 3+ ,Ho 3+ And the like. In this embodiment, a hydrophilic upconversion nano-powder NaYF is selected 4 :Nd 3+ ,Yb 3+ ,Er 3+ @NaYF 4 :Nd 3+ @SiO 2 。
In this embodiment, the method for emitting visible light by the upconversion nanoparticles in step 3) under the excitation of the infrared laser beam to present an optical image includes: the up-conversion nano particle NaYF 4 :Nd 3+ ,Yb 3+ ,Er 3+ @NaYF 4 :Nd 3+ @SiO 2 Under the excitation of a laser beam with 808nm, bright green light and relatively weaker red light are emitted, and the branch ratio of the green light to the red light reaches 8.25. The vortex structure generated by the turbulence effect carries the up-conversion nano particles to form random spatial distribution, and a stable distribution state can be formed in a still water environment, so that the distribution state of the nano colloid particles can present a static or dynamic optical image to reflect the water vortex structure.
In this embodiment, the method for determining the turbulence in the water area by acquiring an optical image with the image acquisition and processing system carried by the aircraft in step 4) and processing the optical image includes: the optical image is a self-luminous phenomenon, the image acquisition module carried by the aircraft acquires the optical image of the nano colloidal particles of unknown water area conditions, the image processing module performs enhancement processing on the optical image by using a soluble operator based on a motion compensation principle, and the optical image distribution condition of the still water environment in the image database is compared after the optical image is displayed by the image display module to judge the turbulence degree of the water body.
The utility model discloses a to the specificity spontaneous light image that up-conversion nanometer particle presented along with vortex rivers gather and handle the analysis, can reach signal transmission-receiving arrangement "integration" and torrent "visual" purpose under water, solve the problem that ubiquitous detecting system signal transmission and receiving arrangement different bodies, feedback signal are difficult to transmit to the navigation equipment body among the existing technology.
The utility model discloses an adopt hydrophilic type NaYF 4 :Nd 3+ ,Yb 3+ ,Er 3+ @NaYF 4 :Nd 3+ @SiO 2 The up-conversion nanoparticles are used as a luminescent material, and the accuracy and the sensitivity of turbulent flow visual imaging are improved by utilizing the good monodispersity of the up-conversion nanoparticles in a water body.
The utility model discloses the absorption spectrum of comprehensive consideration water through selecting conversion light-emitting mechanism on the combination of "808 nm arouses-550 nm transmission", reduces the light-emitting loss in the at utmost, helps improving the stability of optical detection technique under water, strengthens its detectability.
Example 3
On the basis of embodiment 2, the utility model also provides a hydrophilic type Nd 3+ The preparation method of the sensitized nano particle adopts a high-temperature coprecipitation method to prepare monodisperse lanthanide ion doped NaYF 4 Up-converting the core nanoparticle. Then, the surface of the nuclear nano particle is coated with NaYF by adopting an epitaxial layer growth method 4 An inert shell layer. The preparation method comprises the following specific steps:
1) synthesis of NaYF 4 :Nd 3+ ,Yb 3+ ,Er 3+ Core nanoparticles
(1) At room temperature (23-25 deg.C), 3ml OA (oleic acid), 7ml ODE (1-octadecene), 2ml Ln (CH) were aspirated respectively by pipette 3 CO 2 ) 3 (0.2M) aqueous solution to a 50ml two-necked flask (with addition of a pyromagnetite);
(2) placing the two-mouth flask in an oil bath pot, setting the temperature of a heating device to 130 ℃, after the water in the liquid in the two-mouth flask is completely evaporated, heating to 150 ℃, and keeping the temperature for 60 min;
(3) stopping heating, keeping the magnetons to continuously rotate, and slowly cooling the mixed solution to room temperature;
(4) moving the two bottles into a heating sleeve, and setting the temperature of the heating sleeve to keep the temperature of the solution at 50 ℃;
(5) pipette with 2ml NaOH (0.5M) and 4ml NH, respectively 4 F (0.4M) methanol solution is put into a 15ml centrifuge tube, a cover is tightly covered, the mixture is quickly injected into a two-neck flask after vortex oscillation, the constant temperature is 50 ℃, and the mixture is kept for 30 min;
(6) adjusting the temperature of the heating jacket to 110 ℃ to remove methanol in the solution, and connecting the two-mouth flask with the double-row pipes after the methanol is removed;
(7) vacuumizing for 10min, and introducing N for a short time 2 Repeating the above steps for three times;
(8) adjusting the temperature of the heating jacket to heat the solution to 290 ℃ (heating rate 10 ℃/min), keeping the temperature for 1.5h, and slowly introducing N in the whole process 2 ；
(9) Taking down the heating sleeve, keeping the magnetons to continue rotating, and naturally cooling the solution to room temperature;
(10) transferring the mixed solution to a 50ml centrifuge tube, adding 30ml ethanol, placing in a centrifuge, centrifuging at 8000rpm for 8min, and pouring off the supernatant;
(11) adding 4ml of cyclohexane into a centrifugal tube, adding 15ml of ethanol after ultrasonic dispersion, putting the mixture into a centrifugal machine, centrifuging the mixture at the rotating speed of 8000rpm for 8min, removing supernatant, and repeating the step twice;
(12) 4ml of cyclohexane was added to the centrifuge tube, and after ultrasonic dispersion the solution was transferred to a 5ml reagent bottle and labeled and stored in a refrigerator at 4 ℃ until use. TEM tests prove that the sample is monodisperse nanoparticles with the diameter of about 20nm, as shown in figure 3.
2) Synthesis of NaYF 4 :Nd 3+ ,Yb 3+ ,Er 3+ @NaYF 4 :Nd 3+ Core-shell nanoparticles
(1) At room temperature (23-25 deg.C), 3ml OA (oleic acid), 7ml ODE (1-octadecene), 2ml Ln (CH) were aspirated respectively by pipette 3 CO 2 ) 3 (0.2M) aqueous solution to a 50ml two-necked flask (with addition of a pyromagnetite);
(2) placing the two-mouth flask in an oil bath pot, setting the temperature of a heating device to 130 ℃, after the water in the liquid in the two-mouth flask is completely evaporated, heating to 150 ℃, and keeping the temperature for 60 min;
(3) stopping heating, keeping the magnetons to continuously rotate, and slowly cooling the mixed solution to room temperature;
(4) moving the two-mouth bottle into a heating sleeve, and setting the temperature of the heating sleeve to keep the temperature of the solution at 50 ℃;
(5) pipette 4ml of NaYF solution separately with pipette 4 :Nd 3+ ,Yb 3+ ,Er 3+ Transferring the cyclohexane solution into a two-neck flask, and heating for 10 min;
(6) pipette with 2ml NaOH (0.5M) and 4ml NH, respectively 4 F (0.4M) methanol solution is put into a 15ml centrifuge tube, a cover is tightly covered, the mixture is quickly injected into a two-neck flask after vortex oscillation, and the constant temperature is kept at 50 ℃ for 30 min;
(7) the reaction process is the same as the processes (6) to (12) in section 1); TEM tests prove that the sample diameter is increased to about 25nm and still in a monodisperse state, which shows that the shell coating is successfully realized (see figure 4).
The nanoparticles were tested to exhibit bright green emission under excitation by an 808nm infrared laser, the emission spectrum of which is shown in fig. 5. It can be seen that the upconversion luminescence of the nanoparticles is composed of 520-560nm green light and relatively weaker 640-670nm red light emission, and the green-red branch ratio reaches 8.25. FIG. 6 is a transition energy level diagram of an Er-Yb-Nd-Nd system, which can be helpful for analyzing the up-conversion luminescence process of the nano-particles.
3) Synthesis of NaYF 4 :Nd 3+ ,Yb 3+ ,Er 3+ @NaYF 4 :Nd 3+ @SiO 2 Hydrophilically modified nanoparticles
(1) Taking NaYF 4 :Nd 3+ ,Yb 3+ ,Er 3+ @NaYF 4 :Nd 3+ (2ml,0.1M) was mixed with hydrochloric acid (2ml,2M), poured into a 50ml beaker and sealed, after sonication at room temperature for 1h, the reaction solution was transferred into a 50ml centrifuge tube, centrifuged at 10000rpm for 5min, the supernatant was removed, and the precipitate was dissolved in 2ml of water (concentration 0.1M).
(2) Taking NaYF 4 :Nd 3+ ,Yb 3+ ,Er 3+ @NaYF 4 :Nd 3+ (2ml,0.1M), 2.5ml CO-520 was added and stirred for 10 min. 0.45ml of ammonia (mass fraction 25-28%) was added, the vessel was sealed and sonicated for 5min, after which 0.2ml of Tetraethylorthosilicate (TEOS) was added. The vessel was again sealed and stirred at 600rpm for 48 h. After the reaction is finished, adding 50ml of acetone, centrifuging at room temperature at 10000rpm for 5min, removing supernatant, washing the nanoparticles twice with absolute ethyl alcohol and water (1:1), precipitating and centrifuging with 50ml of acetone again to obtain NaYF 4 :Nd 3+ ,Yb 3+ ,Er 3+ @NaYF 4 :Nd 3+ @SiO 2 Finally dissolved in 2ml of water (concentration 0.1M).
The TEM image of the modified core-shell nanoparticle is shown in FIG. 7, and SiO with a thickness of 10nm can be clearly seen on the surface of the upconversion nanoparticle 2 A thin layer. After modification, the nanoparticles can be well dispersed in water and do not aggregate and precipitate for a long time.
The utility model discloses still can be applied to fields such as boats and ships, waters navigation ware, also have potential application prospect and outstanding realistic meaning to fields such as the dangerous early warning of dive motion.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (7)
1. A fluorescence vortex detection device in water, mounted on an aircraft, comprising: the device comprises a shell, a laser emitter, a nanoparticle storage bin and an image acquisition and processing system, wherein the laser emitter, the nanoparticle storage bin and the image acquisition and processing system are packaged in the shell and are sequentially arranged from top to bottom;
the laser emitter and the nanoparticle storage bin are both connected with an image acquisition and processing system, and the laser emitter is used for emitting infrared laser to the direction to be detected for irradiation; the nanoparticle storage bin is used for emitting a projectile filled with hydrophilic upconversion nano powder to a detection direction, the projectile is exploded in a designated area to release upconversion nanoparticles, the upconversion nanoparticles are positioned in an irradiation range of infrared laser, and the upconversion nanoparticles emit visible light and present an optical image under the excitation of an infrared laser beam; the image acquisition and processing system is used for acquiring optical image data, and judging the turbulence condition of a water area through processing and displaying.
2. The apparatus of claim 1, wherein the image acquisition and processing system comprises an image acquisition module, an image processing module and an image display module, the image acquisition module is connected to the laser emitter and the nanoparticle storage bin for acquiring optical image data; the image processing module is respectively connected with the image acquisition module and the image display module through network cables and is used for receiving the original optical image data acquired by the image acquisition module, carrying out image enhancement processing on the original optical image data and transmitting the processed image to the image display module for display.
3. The apparatus of claim 1, wherein the nanoparticle storage bin is positioned 1cm from the top of the housing.
4. The apparatus of claim 1, wherein the laser emitter is disposed 1.5cm below the nanoparticle storage bin, emits infrared laser light at a depression angle of 5 °, and expands the beam via the beam expander.
5. The apparatus of claim 1 or 2, wherein the image acquisition and processing system is disposed 2cm directly below the laser emitter, and the image acquisition and processing system is 1cm from the bottom of the housing.
6. The apparatus of claim 4, wherein the infrared laser emitted by the laser emitter is 808nm infrared laser.
7. The apparatus of claim 1, wherein the upconversion nanopowder is NaYF 4 :Nd 3+ ,Yb 3+ ,Er 3+ @NaYF 4 :Nd 3+ @SiO 2 、NaGdF 4 :Yb 3+ ,Er 3+ @NaGdF 4 @PDAs、BaGdF 5 :Yb 3+ ,Er 3+ 、NaYF 4 :Yb 3+ ,Er 3+ @NaYF 4 :Yb 3+ ,Nd 3+ @PDAs、NaYbF 4 :Er 3+ @NaYbF 4 :Tm 3+ @NaYF 4 、NaYF 4 :Yb 3+ ,Tm 3+ @CaF 2 、NaYF 4 :Yb 3+ ,Tm 3+ ,Ce 3+ 、NaLuF 4 :Yb 3+ ,Tm 3+ ,Er 3+ 、NaLuF 4 :Yb 3+ ,Tm 3+ Or Gd 2 O 3 :Yb 3+ ,Ho 3 + 。
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