222 results about "Ultraviolet absorption" patented technology

The invention relates to the field of glass, in particular to lithium-free alkali aluminosilicate glass as well as a preparation method and application thereof. According to the glass, SiO2, Al2O3, Na2O, K2O, MgO and ZrO2 serve as main components, the content of Li2O is lower than 100 ppm, a nitrate-sulfate-carbon powder composite clarifying agent is adopted, the number of bubbles and the content of residual sulfur are effectively reduced, and use of a toxic or ultraviolet absorption type clarifying agent is avoided. ZrO2 is obtained by calcining a zirconium-based metal-organic framework material and is good in dispersity, and the devitrification resistance is improved. During float forming, through micro-positive pressure, high-purity protective atmosphere and four-zone gradient temperature control, the tin penetration depth is controlled within 15 microns, and the surface tin content is smaller than or equal to 4 micrograms / cm < 2 >. The obtained glass has high light transmittance, high hardness and excellent chemical strengthening performance, and is suitable for the high-end fields of electronic display cover plates, vehicle-mounted screens, touch panels, photovoltaic substrates and the like.

The invention discloses an ultraviolet absorption gas analyzer, and relates to the technical field of gas analyzers. The ultraviolet absorption gas analyzer comprises an analyzer outer shell, the analyzer outer shell is connected with a first supporting seat and a second supporting seat, the first supporting seat is fixedly connected with a light source supporting seat, the light source supporting seat is provided with an ultraviolet light source generator, a rotating disc is rotatably connected between the first supporting seat and the light source supporting seat, and the rotating disc is provided with a rotating shaft. A plurality of groups of optical filter main bodies are arranged on the rotating disc, a measuring air chamber is arranged between the first supporting seat and the second supporting seat, and a light source receiver is arranged on the second supporting seat. According to the ultraviolet absorption gas analyzer, on one hand, protection is provided for the optical filter main body, the optical filter main body is isolated from the external environment, on the other hand, when the optical filter main body is replaced, the replacement of a plurality of groups of optical filter main bodies can be realized only by rotating the rotating disc, and the replacement process is convenient to operate, time-saving and labor-saving.

The invention provides a passive radiation refrigeration fabric as well as a preparation method and application thereof, and belongs to the technical field of automotive interior parts. According to the invention, the polymer of the pre-laid layer can provide good interface bonding force and has good sunlight refraction capability. The inorganic matter can provide good solar ray reflection performance, ultraviolet absorption capacity and thermal radiation performance and has good heat resistance and thermal stability, the resin can evenly disperse the inorganic matter, the structural stability of the cooling layer is guaranteed, and the reflection capacity and thermal radiation performance of the cooling layer can be further enhanced.

The invention relates to the field of water quality detection, in particular to a water quality sampling detection method and device applied to a small and micro wetland unit. The method comprises the following steps: determining a turbidity coefficient according to scattered light intensity of a target water sample under different wavelengths, absorbance of a target interval in an ultraviolet absorption spectrum and fluorescence intensity of a target area in a fluorescence spectrum; determining a scattering equivalent absorption value of each wavelength according to the scattered light intensity of the target water sample under each wavelength, the absorbance corresponding to each wavelength in the ultraviolet absorption spectrum and the turbidity coefficient; determining a real ultraviolet absorption signal of each wavelength according to the absorbance corresponding to each wavelength in the ultraviolet absorption spectrum and the scattering equivalent absorption value of the wavelength; correcting the fluorescence spectrum according to the turbidity coefficient and the scattering equivalent absorption value of each wavelength to obtain a corrected fluorescence spectrum; and detecting the water quality according to the corrected fluorescence spectrum and the real ultraviolet absorption signal of each wavelength. According to the invention, accurate water quality sampling detection can be provided.

The application discloses application of 2-amino isophthalic acid (2-AIA) as a MALDI matrix in characterization of oligosaccharide additives in food. The skeleton structure of 2-AIA has a strong ultraviolet absorption group and a protonation site, which is beneficial to laser energy transmission and desorption ionization process of the measured object. Meanwhile, 2-AIA has multiple polar functional groups, which can effectively enhance the directional combination of the hydroxyl group of 2-AIA and oligosaccharide, and improve the anti-interference ability of impurities in a complex system. In addition, 2-AIA and a traditional organic matrix alpha-cyano-4-hydroxycinnamic acid (CHCA) are combined as a binary matrix (CHCA / 2-AIA), which can play a synergistic role of the double matrix, significantly improve the detection sensitivity of oligosaccharide. On the other hand, the combination of CHCA and 2-AIA with different pH values can significantly improve the uniformity of the co-crystallization, and improve the accuracy and reproducibility of quantitative detection.

The application belongs to the field of pesticide residue detection, and particularly relates to a method for determining pesticides in water samples. The method comprises the following steps: amino modification is performed on MIL-100(Fe) to obtain an amino-functionalized MIL-100(Fe) material; and the pesticides in the water sample are analyzed and detected by using SALDI-TOF-MS with the amino-functionalized MIL-100(Fe) material as a substrate. The application forms a special MOF material by performing amino functionalization modification on MIL-100(Fe), which can enhance the interaction force between the substrate and the analyte, exhibits good ultraviolet absorption and energy transfer capacity, and thus improves the desorption / ionization efficiency in LDI detection. The method is used to detect pesticide residues, and in the low mass region, lower background noise and higher signal intensity are exhibited, so that the detection of pesticide substances in the small molecule region is greatly broken through, and the detection limit is greatly reduced.

The application discloses an anti-ultraviolet aging polycarbonate modified material and application thereof, and belongs to the technical field of polymer material modification. The material comprises synergistically modified polycarbonate, an organic small-molecule functional regulator, an antioxidant, a light stabilizer, a lubricating dispersant and an inorganic filler, wherein the synergistically modified polycarbonate is constructed into a multiple synergistic network by introducing a borate dynamic covalent structure, a Schiff base structure and a rare earth coordination structure, and the organic small-molecule functional regulator is p-hydroxybenzophenone. The preparation method comprises preparation of the synergistically modified polycarbonate and a subsequent melt blending and extrusion process. Through the technical scheme, the synergistic effect of ultraviolet absorption, energy transfer and free radical inhibition is realized, the yellowing degree of the material is significantly reduced, the mechanical property retention rate and the optical stability are improved, and the material is suitable for the fields of automobile transparent parts, outdoor optical materials and electronic and electrical shell.

The invention relates to the technical field of automobile glass surface treatment, in particular to heat management coated glass and a preparation method thereof, and the heat management coated glass is prepared by compounding two pieces of composite glass through an adhesive film; the composite glass sequentially comprises a glass substrate, an ultraviolet absorption functional layer and an infrared reflection functional layer, the preparation raw materials of the ultraviolet absorption functional layer at least comprise a SiO2 sol matrix and an inorganic ultraviolet absorbent; the preparation raw materials of the infrared reflection functional layer at least comprise tetraethoxysilane, acetylacetone, hydrochloric acid and antimony-doped tin oxide nanoparticles. The surface of the glass is coated with the optimized ultraviolet absorption functional layer and the infrared reflection functional layer, so that the barrier rate to ultraviolet (UV) of 99% or above and the reflectivity to infrared (IR) of 80-90% are achieved, and meanwhile, the glass has the characteristics of low cost and high weather resistance.

The invention belongs to the technical field of metering, and particularly relates to a method for developing an L-phenylalanine solution standard substance based on a solid state national first-grade standard substance. On one hand, the fixed value is accurate and reliable, on the other hand, the uniformity and the stability of the L-phenylalanine solution standard substance are accurately and reliably analyzed, and on the other hand, the uncertainty of the L-phenylalanine solution standard substance is comprehensively evaluated; in addition, in the process of analyzing the uniformity and the stability of the L-phenylalanine solution standard substance, test parameters of an ultra-high performance liquid chromatography-ultraviolet absorption method are screened, and a method for analyzing the accuracy and the precision is established; therefore, the technical problem of lack of the L-phenylalanine solution standard substance in the prior art is solved.

The utility model discloses louver type dimming glass, which relates to the technical field of dimming glass and comprises a glass mounting frame, a dimming glass main body is mounted in the glass mounting frame, a fireproof layer and an elastic cushion are arranged on the inner wall of the glass mounting frame, and a sealing layer is connected between the elastic cushion and the dimming glass main body. The dimming glass body comprises a transparent conductive base material layer, the two sides of the transparent conductive base material layer are each provided with an adhesive clamping layer, the outer walls of the adhesive clamping layers on the two sides are provided with a first dimming film and a second dimming film respectively, and the outer sides of the first dimming film and the second dimming film are connected with an ultraviolet absorption adhesive film and an infrared absorption adhesive film through the adhesive clamping layers respectively. And an outer glass layer and an inner glass layer are respectively arranged on the outer sides of the ultraviolet absorption adhesive film and the infrared absorption adhesive film. According to the louver type dimming glass, various combined colors can be generated, the practicability of the louver type dimming glass is improved, the blocking effect of the louver type dimming glass on infrared light and ultraviolet light is improved, and meanwhile the situation that the dimming glass leaks light can be avoided.

The application discloses a sunscreen composition based on the ultraviolet absorption characteristics of yellow water of liquor, and a preparation method and application thereof. The sunscreen composition comprises 10-60 parts by weight of a yellow water extract of a strong-flavor liquor, 20-70 parts by weight of a yellow water extract of a Maotai-flavor liquor, and 0-40 parts by weight of a yellow water extract of a light-flavor liquor. It is found that the yellow water of different flavor liquors has characteristic ultraviolet absorption spectrum, wherein the yellow water of the strong-flavor liquor has strong absorption in the UVB band (290-320 nm), the yellow water of the Maotai-flavor liquor has strong absorption in the UVA band (340-380 nm), and the yellow water of the light-flavor liquor has relatively uniform absorption in a wide band. According to the spectral complementarity, the natural sunscreen composition is obtained. The sunscreen composition has an in-vitro SPF value of 15-35, a PA value of ++~++++, good light stability and low skin irritation.

The invention discloses a preparation method of a light response type UV regulation and control material and a 3A optical film, and relates to the technical field of optical films.The preparation method comprises the steps that spiropyrane is dissolved in ethyl acetate to form an oil phase, and first liquid is obtained; dispersing nano silicon dioxide in a water phase containing gelatin to obtain a second liquid; stirring and mixing the first liquid and the second liquid to form an emulsion; evaporating the emulsion at 55-65 DEG C for at least 12 hours to form a spiropyrane-silicon dioxide hybrid nanocapsule; the spiropyrane-silicon dioxide hybrid nanocapsule is dispersed into light-cured polyacrylate, and a light response type UV regulation and control material is obtained; the 3A optical film comprises a light response type UV regulation and control layer, and the material of the light response type UV regulation and control layer is a light response type UV regulation and control material. The 3A optical film realizes flexible regulation and control of absorption of ultraviolet rays according to different weather scenes.

The present disclosure provides an energy collection heat insulation composite film, a preparation method thereof, and heat insulation glass. The energy collection heat insulation composite film comprises a heat insulation layer, an infrared reflection film, a thermoelectric conversion layer, and an ultraviolet absorption film. The infrared reflection film is arranged on the heat insulation layer, the thermoelectric conversion layer is arranged on the side of the infrared reflection film away from the heat insulation layer, and the ultraviolet absorption film is arranged on the side of the thermoelectric conversion layer away from the infrared reflection film. The material of the infrared reflection film comprises a material capable of reflecting infrared rays. The material of the ultraviolet absorption film comprises a material capable of absorbing ultraviolet rays. The energy collection heat insulation composite film can not only consume heat to avoid long-term accumulation of heat in the energy collection heat insulation composite film, but also realize recycling of heat energy.

This invention discloses gold nanoparticle-modified metal oxide framework materials, their preparation methods, and applications, relating to the fields of material preparation and detection technology. The preparation method of the gold nanoparticle-modified metal oxide framework material includes: in-situ reduction of chloroauric acid on the surface of ZIF-67 via a reduction method to obtain an Au / ZIF-67 composite material; and calcination of the Au / ZIF-67 composite material using a programmed temperature rise process to obtain the final product. This invention also provides applications of this material in serum metabolite detection and in screening metabolic biomarkers for esophageal cancer diagnosis. The composite material prepared by this invention possesses a unique hollow porous structure and uniformly distributed gold nanoparticles, providing a large specific surface area for enriching metabolites in serum. It also enhances the ultraviolet absorption and photothermal conversion efficiency of the nanocomposite material, while improving the material's conductivity, thereby significantly improving laser desorption / ionization efficiency and achieving high-sensitivity detection.

The invention belongs to the technical field of organic matter detection, and particularly provides a chiral purity detection method of (S)-3-chloro-1, 2-propylene glycol, which comprises the following steps: S1, reacting (S)-3-chloro-1, 2-propylene glycol to be detected with a transforming agent to generate a derivative capable of absorbing ultraviolet rays; step S2, carrying out liquid chromatography detection on the derivative to obtain a liquid chromatogram; and S3, determining the chiral purity of the derivative based on the liquid chromatogram, and taking the chiral purity of the derivative as the chiral purity of the (S)-3-chloro-1, 2-propylene glycol to be detected. According to the chiral purity detection method of the (S)-3-chloro-1, 2-propylene glycol provided by the embodiment of the invention, the ultraviolet absorption group is derived and introduced into the (S)-3-chloro-1, 2-propylene glycol, so that the isomer can be detected and separated by using low-cost liquid chromatography, and the chiral purity of the (S)-3-chloro-1, 2-propylene glycol can be accurately determined on the basis.

The application discloses a kind of high weatherability polyvinyl chloride cable material and preparation method thereof, including the following weight parts of component: PVC resin 100 parts;Plasticizing system 35-55 parts;Dynamic crosslinking toughening compound 8-20 parts;Calcium-zinc stabilizer 4-8 parts;Ultraviolet light stabilizing system 0.3-1.5 parts;Flame-retardant-reinforcing synergic system 30-60 parts;Processing lubricating system 1-3 parts.The application constructs dynamic reversible ionic crosslinking network in PVC cable material for the first time, and simultaneously solves the two big problems of small molecule plasticizer migration and low temperature brittleness, unifies the inherent contradiction of cold resistance and anti-migration;Gradient refractive index core-shell toughening agent is designed and applied as "structured ultraviolet trap", and the ultraviolet absorption efficiency is greatly improved through physical optical mechanism, realizes the synergy of toughening and super long weather resistance, and does not depend on excessive carbon black, which provides design space for product color.

The present application relates to a method of manufacturing a display apparatus, a guide film, a method of manufacturing a guide film, and an apparatus for manufacturing a display apparatus. The method of manufacturing a display apparatus includes preparing a display panel including a main display area, a first edge area, a second edge area, a third edge area, a fourth edge area, a driving chip, and a printed circuit film, and disposing the display panel on a guide film disposed on a forming pad. The guide film includes a main film portion overlapping the main display area, a first film portion, a second film portion, a third film portion, a fourth film portion, and a first ultraviolet absorption pattern attached to the fourth film portion.

The invention discloses an optical waveguide structure composite material based on SAN resin and a preparation method thereof. The raw material composition is as follows: 60-70 parts of SAN resin; 30 to 40 parts of PMMA (polymethyl methacrylate) resin; 0.1 to 1 part of modified nano CeO2; 1 to 5 parts of a maleic anhydride grafted SEBS compatilizer; and 0.1 to 1 part of an antioxidant. According to the material, through a double-effect anti-reflection mechanism of a synergistic effect, the light transmittance gt of a key ultraviolet band is remarkably improved; on one hand, the refractive index difference between the PMMA fibers which are continuously distributed in the axial direction and the SAN matrix is utilized to guide ultraviolet light to generate total internal reflection conduction at an interface, and the inherent strong ultraviolet absorption characteristic of the SAN matrix is effectively avoided; on the other hand, by means of the Rayleigh scattering effect generated by the CeO2 nanoparticles which are subjected to double surface modification and are uniformly dispersed, the transmission efficiency of ultraviolet light is selectively enhanced. According to the preparation method, a slit die head is adopted for extrusion preforming, and key processes of longitudinal hot stretching (inducing PMMA fibrosis) and water bath shock cooling (locking an optical waveguide microstructure) are combined, so that precise construction and large-scale preparation of an optical waveguide structure in the material are realized. The prepared composite material has high ultraviolet light transmittance, excellent mechanical properties and good chemical resistance, and has wide application prospects in the fields of micro-fluidic chips, electrophoresis plates, medical instruments and optoelectronic devices.

A polyimide resin and the use thereof. The polyimide resin has a structure as represented by formula I. In the polyimide resin, due to the introduction of an amide structure or a nitro group, the intermolecular force is increased by means of a large number of hydrogen bonds, thereby increasing the glass transition temperature (Tg) of the polymer material; and an ether bond is introduced via R1 to enhance the adhesion between the material and a substrate, thereby avoiding a decrease in the adhesion due to increased Tg. By introducing an amide bond, a nitro group and an ether bond into the polyimide resin, the ultraviolet absorption of the material exhibits a red shift, resulting in stronger absorption at wavelengths of 300 nm or more, and making the material compatible with processes performed at a wavelength of 355 nm. When used in a transfer adhesive, the polyimide resin can ensure better temperature resistance and a high transfer yield of the transfer adhesive; and the polyimide resin is compatible with a 355-nm laser ablation process, requires lower laser energy, causes less damage to a chip, and leaves no adhesive residue.

The invention relates to a niobium tantalum oxyfluoride acid ammonium salt second-order nonlinear optical crystalline material and preparation and application thereof, the chemical formula of the material is (NH4) 5 (NbOF4) (TaF7) 2, the crystalline material belongs to a tetragonal system, the space group is I4cm, and the cell parameters are alpha = beta = gamma = 90 degrees and Z = 2. Under 1064nm laser irradiation, the powder frequency-doubled effect of the nonlinear optical crystal (NH4) 5 (NbOF4) (TaF7) 2 can reach 3.5 times that of a KH2PO4 (KDP) crystal, under 532nm laser irradiation, the powder frequency-doubled effect of the nonlinear optical crystal (NH4) 5 (NbOF4) (TaF7) 2 is 0.35 times that of a beta-BaB2O4 (BBO) crystal, and phase matching can be realized. In addition, the ultraviolet absorption cutoff edge of the crystalline material is less than 195 nm, and the crystalline material shows moderate birefringence (0.095 at-546 nm). The crystalline material provided by the invention has important application value in the photoelectric fields of solid-state lasers, spectral analysis, precision manufacturing, optical communication and the like.

The application relates to a gold nanoparticle array preparation method with strong stability and reusability, high cysteamine-stabilized gold nanoparticles are prepared first, the spacing between the gold nanoparticles is changed by utilizing the coulomb repulsion between the gold nanoparticles, then the gold nanoparticle solution is added dropwise to a glass surface modified by gamma-glycidoxypropyltrimethoxysilane to react, stable covalent bonds are formed, and gold nanoparticle arrays with uniform distribution on the glass surface can be obtained after the reaction. The preparation does not require high temperature, the experimental operation is simple and convenient, the gold nanoparticles are arranged in order and closely, have high detection sensitivity, have strong ultraviolet absorption capacity, good stability, reusability, salt resistance and low background interference, and can be reused. The gold nanoparticle array can realize detection analysis on high-salt-content samples in surface-assisted laser desorption ionization mass spectrometry and be used for rapid analysis of small molecule compounds in positive and negative ion dual modes.

The utility model relates to the technical field of optical lenses, discloses an anti-ultraviolet imaging optical lens, and solves the problems that a conventional anti-ultraviolet lens is simple in structure, has limited absorption and reflection effects on ultraviolet rays and cannot play a role in protecting eyeballs. The upper side of the lens strengthening layer is coated with the ultraviolet reflection layer, the upper side of the ultraviolet reflection layer is coated with the ultraviolet absorption layer, the upper side of the ultraviolet absorption layer is coated with the lens protection layer, the lens strengthening layer improves the overall hardness of the lens, and the ultraviolet reflection layer refracts ultraviolet rays; the ultraviolet absorption layer absorbs transmitted ultraviolet rays to a certain degree, and the lens protection layer protects the surfaces of the lenses from being scratched easily.

The invention discloses a benzophenone photoinitiator. The structure of the benzophenone photoinitiator is shown as a formula (I) or a formula (II): (I) and (II), wherein Rn is single substitution or multi-substitution on a benzene ring, and Rn is selected from one of hydrogen atom, alkyl, N-alkyl, O-alkyl, S-alkyl, Se-alkyl, Si-alkyl, aromatic ring group and acyloxy. The photoinitiator not only has a benzophenone structure, but also has a part of thioxanthone structure, so that compared with traditional benzophenone photoinitiators and thioxanthone photoinitiators, the photoinitiator is more excellent in ultraviolet absorptivity, photo-initiation efficiency, solubility and the like, is more environment-friendly, is wider in application range, and can be widely applied to the field of photoinitiators. The raw materials are easy to obtain, the production cost is low, and industrial production and application are facilitated.

The invention discloses an ultraviolet absorption method COD detector based on multi-parameter compensation, a detection system and a detection method. The COD detector comprises an ultraviolet light source; the reference light source, the ultraviolet light source and the reference light source do not work simultaneously; a spectroscope, a first optical switch, a first optical window, a second optical window, a condensation assembly and an optical detector are sequentially arranged on the main optical path channel in the optical path direction; the compensation light path channel comprises a first reflecting mirror, a second optical switch and a second reflecting mirror which are sequentially arranged along the light path direction; the signal processing unit is respectively connected with the first optical switch, the second optical switch, the ultraviolet light source, the reference light source and the optical detector, and the COD detector has a measurement mode, a first compensation mode for acquiring a light window pollution coefficient, a second compensation mode for acquiring a light source intensity compensation coefficient and a calibration mode for calibrating model parameters of a measurement model. The method is used for compensating COD. The COD detector provided by the invention can improve the COD measurement precision.

The present application relates to a kind of judging methods of degumming state of silk, belong to silk fibroin production technical field, the degumming is to cut dry cocoon and put into degumming system and carry out degumming, by obtaining the first degumming liquid data and first silk data in the first degumming stage, obtain the second degumming liquid data in the second degumming stage, derive degumming liquid data change value, obtain second silk data based on degumming change value and first silk data, further judge the degumming state of silk, can only be determined by the conductivity of degumming solution and ultraviolet absorption peak value on-line judge degumming process corresponding degumming point silk fibroin degumming rate and silk fibroin molecular weight, can be used to monitor degumming progress, to control process to accurately control the molecular weight of silk fibroin, and suitable for alkaline degumming system and enzyme degumming system, provide universal judging standard, in the regulation silk fibroin molecular weight, cocoon raw material selection degumming process, screening cocoon raw material has important research significance and application value.

The invention relates to an ultraviolet-aging-resistant light composite material, the material comprises a base layer and a functional coating, the base layer comprises a polymer matrix and an elastic microsphere low-temperature anti-cracking agent, and the functional coating comprises water-based resin and hollow anti-ultraviolet particles. The elastic microsphere low-temperature anti-cracking agent is of a multi-layer core-shell structure with a polybutadiene microgel inner core, a POE-g-GMA toughness middle layer and an organic-inorganic hybrid silicon shell, and the hollow anti-ultraviolet particles are hollow silicon dioxide microspheres with ZnO nanocrystals growing on the surfaces. The composite material has excellent lightweight characteristic and mechanical property, the low-temperature crack resistance and impact resistance of the material are remarkably improved by the elastic microsphere low-temperature anti-cracking agent through a multi-energy dissipation mechanism, and the hollow anti-ultraviolet particles provide lasting and efficient ultraviolet protection for a matrix through the synergistic effect of physical shielding and ultraviolet absorption.

The invention discloses a micro / nano plastic based on organic long-afterglow material labeling and a preparation method and application thereof, and belongs to the technical field of crossing of environmental science and macromolecular nano materials. According to the method, organic long-afterglow material dispersion liquid is dropwise added into micro / nano plastic dispersion liquid, and swelling is balanced; and carrying out rotary evaporation to remove the swelling agent, washing, and dialyzing until the dialysate has no obvious ultraviolet absorption, so as to obtain the micro / nano plastic marked by the organic long afterglow material. According to the method, the characteristic that the organic long-afterglow material can realize high-brightness luminescence without in-situ excitation is utilized, and the background interference of an environmental medium is effectively inhibited, so that the signal-to-noise ratio and the sensitivity of micro / nano plastic detection are remarkably improved under the environmental concentration condition. Compared with an existing marking technology, the method has the advantages that the operation is simple, the cost is low, the biocompatibility is good, and the problems of false positive interference and photobleaching can be effectively avoided; good application prospects are shown in the fields of environment migration behavior research of micro / nano plastic, bioluminescence imaging and the like.

The invention provides a laser absorption and LIF imaging fused water quality COD detection method and system, and belongs to the technical field of water quality monitoring, the method comprises the following steps: placing a to-be-detected water sample in a sample pool, and vertically irradiating the water sample with laser; performing high-concentration COD detection by adopting an ultraviolet absorption spectrophotometry based on a Lambert-Beer law in combination with a calibration curve; a laser induced fluorescence (LIF) imaging technology is adopted, the RGB gray value of the ROI of a fluorescence image is extracted, and low-concentration COD detection is carried out in combination with a fluorescence intensity-COD model; automatically matching and detecting according to the concentration of the water sample, and outputting a final COD detection value; the system comprises a laser emission module, an image acquisition module, a sample detection module, a transmission light detection module and a data processing module. The advantages of two optical detection technologies are fused, rapid and accurate detection of COD of various water bodies is achieved, the system sensitivity is high, the structure is compact, and real-time monitoring of COD of the water bodies is achieved.

The invention relates to the technical field of polyester fabrics, and discloses an antistatic polyester fabric and a preparation method thereof. The preparation method comprises the following steps: reacting 2, 4, 4-trihydroxy benzophenone with 5-(bromomethyl) isophthaloyl dichloride to generate a finishing agent precursor, then reacting with N, N-dimethyl tertiary amine to generate a polyester finishing agent, preparing a finishing liquid, and finishing polyester to obtain the antistatic polyester fabric. The finishing agent contains an o-hydroxybenzophenone ultraviolet absorbing group and a quaternary ammonium salt structure, the o-hydroxybenzophenone ultraviolet absorbing group can efficiently absorb ultraviolet rays, the ultraviolet protection coefficient of the polyester fabric is remarkably improved, and the anti-ultraviolet performance of the polyester fabric is enhanced; the electrostatic voltage of the polyester can be effectively reduced, so that the antistatic performance of the polyester is remarkably improved. In addition, the polyester finishing agent contains polyester molecular chains similar to polyester, the interface affinity between the polyester molecular chains and the polyester molecular chains is high, the finishing agent is not prone to falling off after washing, and the polyester still keeps excellent anti-ultraviolet and anti-static effects after being washed for 30 times.