16 results about "Polarized fluorescence" patented technology

The invention relates to a ship-borne unmanned aerial vehicle recycling method and system based on visual navigation and six-degree-of-freedom compensation. The method comprises the following steps: extracting infrared, polarization and fluorescence frequency domain features and fusing to obtain an anti-shielding composite descriptor; constructing a ship dynamics differential model, discretizing the ship dynamics differential model by adopting an explicit multi-step method, and predicting six-degree-of-freedom disturbance data of the ship; a vision and inertia combined cost function is constructed, a vision residual item is calculated, the continuity of the motion track of the unmanned aerial vehicle is restrained, and the optimized real-time pose of the unmanned aerial vehicle is obtained; decomposing the six-degree-of-freedom disturbance data into a body coordinate system compensation amount, setting a backstepping sliding mode control law containing feed-forward compensation, and generating an anti-disturbance trajectory instruction; and air data are collected in real time, the rotor rotating speed is corrected according to the air data, the electromagnetic adsorption force is calculated, and the ship-borne unmanned aerial vehicle is recycled. And the navigation stability under complex sea conditions is enhanced.

The application discloses an up-conversion circular polarization fluorescent device of perovskite quantum dots, which comprises, from bottom to top, a light-transmitting glass substrate, a parallel orientation layer, a reflection layer, a transparent separation layer and a composite nanomaterial layer; the reflection layer is a polymer cholesteric liquid crystal layer; the transparent separation layer is made of one of polymethyl methacrylate and polyvinyl alcohol; the composite nanocrystal material layer is composed of perovskite quantum dots / up-conversion nanocrystal composite nanomaterial; the perovskite quantum dots / up-conversion nanocrystal composite nanomaterial is prepared by an in-situ synthesis method. The device has the properties of circular polarization luminescence and up-conversion circular polarization luminescence, and has excellent performances such as high stability, high energy transfer efficiency, high radiation intensity and good repeatability.

The present invention discloses a method for reconstructing the spatial and angular distribution of fluorescent molecules based on high-dimensional and efficient deconvolution. Through a newly designed spatial angular back-projection operator and iterative framework, the spatial and angular distribution of fluorescent molecules can be reconstructed more quickly using polarized fluorescence microscopy data. While maintaining noise suppression and the spatial resolution and angular distribution accuracy of the reconstruction results, the number of iterations can be reduced to 1, significantly reducing reconstruction time and memory usage costs. Therefore, the present invention effectively designs a high-dimensional and efficient deconvolution algorithm for reconstructing the spatial angular distribution of molecules from polarized fluorescence microscopy data, solving the problems of the existing methods with a large number of iterations, long calculation time, and high computational cost, and providing powerful algorithmic support for subsequent larger-scale and higher-dimensional fluorescent molecular structure research.

The invention discloses a preparation method and application of a double-layer composite film with circularly polarized light (CPL) characteristics, and belongs to the technical field of optical materials. According to the invention, a double-layer composite film for finely dividing an optical functional area is designed, a micron-sized fluorescent material is deposited on the bottom layer of the film and is only used for photoluminescence, and cellulose nanocrystals (CNC) are compounded above the fluorescent layer and are only used as an optical filter for selectively transmitting right-handed circularly polarized fluorescence; by controlling the volume of the CNC solution, a thin film with a high asymmetry factor (Glum) and an adjustable Glum factor is obtained. The preparation method breaks through the size limitation that only nanoscale fluorescent powder can be blended with CNC (computer numerical control) to obtain circularly polarized light fluorescent powder in the prior art, greatly expands the selection range of optical inactive materials for obtaining circularly polarized light, is simple and convenient to prepare and operate, is green and environment-friendly, is beneficial to actual production, and is expected to promote the progress of optical anti-counterfeiting.

This invention belongs to the field of nondestructive testing technology for wood, and provides a method and system for detecting surface cracks in wood based on polarization-fluorescence dual-modal dynamic fusion. The method includes: acquiring polarization images, calculating Stokes vector components, performing frequency domain filtering on the Stokes vector components to obtain a stress distribution map and candidate crack regions, applying enzyme-responsive fluorescent probes to the candidate crack regions to obtain real fluorescence images, fusing the stress distribution map and the real fluorescence images to obtain a spatiotemporal graph structure sequence, constructing a dynamic graph neural network model and inputting the spatiotemporal graph structure sequence to obtain the final crack detection report. The method and system for detecting surface cracks in wood provided by this invention, through dual verification by physical stress and chemical activity, reduces the interference of wood texture and the false detection rate, thereby improving the sensitivity and reliability of surface crack detection.

The application discloses a film material capable of exciting high-intensity circularly polarized light and a preparation method and application thereof. The preparation method of the film material comprises the following steps: (1) uniformly stirring and mixing cellulose nanocrystal suspension and gelatin solution, and then drying into a film after ultrasonic treatment to obtain a cellulose nanocrystal / gelatin chiral film; (2) dispersing luminophores into water to obtain a luminophore solution; (3) placing the cellulose nanocrystal / gelatin chiral film at the bottom of a suction filter, then pouring the luminophore solution, and then performing suction filtration and vacuum drying to obtain the film material capable of exciting high-intensity circularly polarized light. The film material prepared in the application can produce high-intensity circularly polarized fluorescence, has good cyclic repeatability, and can be applied to asymmetric photosynthesis, encrypted transmission, biological imaging, anti-fake manufacturing, optical display and the like.

The application provides a circularly polarized luminescent carbon quantum dot film composite material and a preparation method and application thereof, and the preparation method comprises the following steps: (1) mixing CNCs and deionized water, dispersing, heating and stirring to obtain CNCs suspension liquid; (2) dissolving FeCl3.6H2O and FeSO4.7H2O in distilled water, then adding the distilled water into the CNCs suspension liquid, reacting, then adding NH3.H2O aqueous solution, continuously reacting, and post-treating to obtain a Fe3O4 / CNC composite material; (3) mixing carbon quantum dot aqueous solution, Fe3O4 / CNC composite material aqueous solution and CNCs suspension liquid, dispersing to obtain a colloidal suspension liquid, placing the colloidal suspension liquid in a magnetic field, and evaporating and concentrating to obtain the circularly polarized luminescent carbon quantum dot film composite material. The application is based on magnetic field regulation and control to synthesize a composite material which is chiral and has circularly polarized fluorescence activity.

The invention provides a multi-element detection method and system for a precious metal analyzer based on a polarized X-ray fluorescence spectrum. The method comprises the following steps: firstly, operating a polarized X-ray fluorescence spectrum analyzer to generate a plurality of polarized X-ray beams, and secondly, focusing the plurality of polarized X-ray beams and irradiating the focused polarized X-ray beams on a noble metal sample to excite a plurality of noble metal elements; capturing a fluorescent X-ray signal emitted from the noble metal sample through a multi-dimensional detector array, generating a multi-element spectral response by using the fluorescent X-ray signal, and finally completing synchronous detection of various noble metal elements through the multi-element spectral response. According to the technical scheme provided by the invention, the multi-element detection efficiency is improved, and the accuracy and reliability of multi-element synchronous detection are greatly improved.

This application discloses a thermal detection system and a method for identifying chiral substances, relating to the field of micro-nano optical technology. The thermal detection system and the method for identifying chiral substances are based on the structure of the thermal detection system and the steps of the method. The chiral substance to be detected is configured into a corresponding test solution, and then a sample of the test solution is taken and placed in an absorber. The surface plasmon effect generated when the metal resonant layer receives chiral light irradiation is used to output a corresponding thermal signal. The thermal signal is then captured and analyzed by the thermal detection system, achieving high-precision identification of the chiral substance. Compared to traditional circular dichroism and circularly polarized fluorescence spectrometers, the technical solution of this application has a simple structure, is easy to operate, and has lower requirements for the concentration and volume of the test sample.

The present invention discloses a device and method for modulating the polarization of two-dimensional crystal bandgap fluorescence. The device comprises: a highly conductive material substrate; an insulating layer formed on the highly conductive material substrate; a two-dimensional crystal monolayer formed on the insulating layer; a light-transmitting dielectric layer formed on the two-dimensional crystal monolayer; and a metal nano-metamaterial having a periodic unit structure formed on the light-transmitting dielectric layer. Based on the principle of metal surface plasmon resonance, the present invention utilizes the anisotropic resonant field of the metal nano-metamaterial to control the semiconductor fluorescence field, achieving polarized fluorescence and achieving polarization tunability. The device and method for modulating the polarization of two-dimensional crystal bandgap fluorescence effectively broaden the linear tunable range and temperature applicable range of the two-dimensional crystal bandgap fluorescence.

The application provides application of a non-chiral perovskite single crystal material in polarized fluorescence. The perovskite single crystal material has a molecular formula of (4-AMP)PbBr4, wherein 4-AMP is 4-aminomethylpiperidine. The (4-AMP)PbBr4 single crystal material is prepared by dissolving 4-AMP and lead bromide in a hydrobromic acid solution, slowly reducing to room temperature after heating to complete dissolution, and washing, centrifuging and drying the precipitate to obtain the (4-AMP)PbBr4 single crystal. The (4-AMP)PbBr4 single crystal prepared by the application is a non-chiral material, but has optical activity due to low symmetry of the crystal structure. Under the condition of linear polarized light excitation and circular polarized light detection, the maximum polarization degree of the perovskite single crystal material can reach 54%, and the polarization degree can be controlled by rotating the crystal. The preparation method has the advantages of low raw material price, mild conditions and simple operation, and the synthesized (4-AMP)PbBr4 single crystal has the characteristics of large polarization degree and easy control.

The invention provides a light generating system (1000) comprising a first light generating device (110), a first luminescent material (210), a diffuser assembly (700), optical elements (500), and a light exit (1090), wherein; (A) the first light generating device (110) is configured to generate first device light (111); (B) the first luminescent material (210) is configured in the transmissive mode; wherein the first luminescent material (210) is configured (i) to convert at least part of the first device light (111) into first luminescent material light (211), and (ii) to transmit at least part of the first device light (111) to the diffuser assembly (700); (C) the optical elements (500) comprise a reflective polarizer (501) configured in an optical path between the first luminescent material (210) and the diffuser assembly (700); wherein the reflective polarizer (501) is configured (i) to reflect (ia) first device light (111) and (ib) first luminescent material light (211) having the first polarization back to the first luminescent material (210), and (ii) to transmit (iia) first device light (111) and (iib) first luminescent material light (211) having the second polarization to the diffuser assembly (700); wherein the first linear polarization and the second linear polarization are different linear polarizations; (D) the diffuser assembly (700) comprises a diffuser (710) configured in the reflective mode and a polarization converter (720); wherein the diffuser (710) is configured to diffuse the first device light (111) and the luminescent material light (201) into diffused first device light (711) and diffused luminescent material light (271); (E) the optical elements (500) further comprise a first polarization based redirection optical element (510) configured in an optical path between the reflective polarizer (501) and the diffuser assembly (700); wherein the first polarization based redirection optical element (510) is configured to (i) direct (ia) the luminescent material light (201) and (ib) first device light (111) having the second polarization to the diffuser assembly (700), and to (ii) direct (iia) diffused first device light (711) and (iib) diffused luminescent material light (271) having the first polarization to the light exit (1090); and (F) the light generating system (1000) is configured to generate system light (1001), wherein the system light (1001), in an operational mode of the light generating system (1000), comprises at least part of the diffused luminescent material light (271) and at least part of the diffused first device light (711).

The application discloses a kind of for anti-fake, convertible chiral circular polarized fluorescence composite film, the method adopts physical doping method and evaporation induced self-assembly technology is combined, through 2,6-pyridine dicarboxylic acid coordination rare earth metal, again with polyethylene glycol hybrid as precursor, be added to cellulose nanocrystal solution, self-assembly is obtained after drying chiral circular polarized fluorescence composite film;Specific steps include: step 1, 2,6-pyridine dicarboxylic acid coordination rare earth metal preparation;Step 2, the preparation of polyethylene glycol wrapped 2,6-pyridine dicarboxylic acid coordination rare earth metal precursor;Step 3, the preparation of self-assembly composite film of cellulose nanocrystal and precursor.The application uses green sustainable cellulose nanocrystal as matrix;2,6-pyridine dicarboxylic acid coordination rare earth metal is fluorescent light source;Excellent multilevel optical nature and anti-fake ability.

The utility model relates to the technical field of auxiliary detection devices, in particular to a pretreatment device of a polarized luminoscope. The device comprises a pretreatment device for supplying a mixed solution to a polarization luminoscope, wherein the pretreatment device comprises a workbench, a reagent supply loop, a standard solution supply loop and a solution mixing loop; the reagent supply loop comprises a lifting suction pipe and a filter membrane; the standard liquid supply loop comprises a standard liquid suction pipe and a plunger pump; the solution mixing loop comprises a three-way electromagnetic valve, a liquid storage ring, a peristaltic pump and a constant temperature device which are located in the workbench. Through the cooperative work of the lifting suction pipe, the plunger pump and the three-way electromagnetic valve, a reagent and a standard solution can be automatically and accurately mixed, and are stably conveyed to the polarization luminoscope through the peristaltic pump; the whole device is small in size and compact in layout; the constant temperature device can monitor and control the temperature of the mixed liquid in real time, and is convenient to operate, high in precision and good in accuracy.

The application provides a kind of thermal enhancement circularly polarized fluorescence (CPL) supramolecular gel material, which is obtained by forming a complex of chiral bridged ring compound and metal ions, and then reacting with fluorescent dye molecules. The raw materials are biologically friendly and widely available, and do not require the use of reaction aids and organic reagents. The reaction conditions are mild, and do not require special conditions and equipment. The preparation method is simple, green and environmentally friendly. The prepared supramolecular gel has excellent thermal enhancement circularly polarized fluorescence and mechanical properties. Compared with ordinary circularly polarized fluorescence materials, the thermal stability is greatly improved, overcoming the shortcomings of general CPL materials that are not resistant to high temperature. It can meet the requirements of industrial production and use, and is conducive to popularization and application.

The invention discloses a chiral self-assembly material based on a tetraphenyl ethylene-carbazole material and a self-assembly method of the chiral self-assembly material. A carbazole unit is used as an electron donor (D) to construct a D-A type conjugated skeleton with a carborane electron acceptor (A), and a tetraphenyl ethylene unit with propeller-shaped dynamic conformation is introduced; the rigid plane structure of carbazole endows the molecule with a significant pi-pi stacking tendency, and the flexible conformation of tetraphenyl ethylene provides dynamic adjustability for the system; through co-assembly with chiral limonene, the successful coupling between the chiral limonene and molecules increases the orderliness of molecular stacking from the macroscopic level, greatly improves the circular polarization value, provides a powerful structural model and theoretical basis for constructing the structure-function relationship between the structure of the organic supramolecular self-assembly body and circular polarization fluorescence, and has broad application prospects. And a novel strategy is provided for designing a novel organic circularly polarized photoelectric material.