8 results about "Polarized fluorescence" patented technology

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 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 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.

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.