426 results about "Optical absorbance" patented technology

The invention provides a rapid evaluation method and system for the soil fertility level, and relates to the technical field of soil fertility detection.The rapid evaluation method comprises the steps that an original absorbance spectral data curve is obtained by scanning a soil sample, the moisture peak absorbance, the actual peak position wavelength and the moisture synthetic frequency characteristic peak width are extracted, and a spectral data basis is provided; a water-salt optical path coupling factor is calculated, water-salt correction operation is carried out in combination with a volume correction coefficient, a virtual dry soil spectrum data curve is obtained, interference of salt on a water optical path is quantified, and a water background and salt masking are eliminated; constructing a characteristic virtual baseline of the organic matter and the total nitrogen, calculating an integral area to obtain characteristic intensity of the organic matter and the total nitrogen, and providing a physical input variable for quantitative inversion; introducing a water-salt optical path coupling factor to invert the organic matter content and the total nitrogen content, and correcting signal depression caused by salt stress; the effective fertility index is calculated and graded by combining the organic matter content and the total nitrogen content of the soil, and the actual fertilizer supply capacity of the soil is comprehensively evaluated.

The invention belongs to the field of medical instrument coloring agents, and provides a natural anthocyanin endoscope coloring agent. According to the invention, the innovative design of combining a ternary color-stabilizing compound formed by anthocyanin, a co-chromophore and hydroxypropyl beta cyclodextrin with a chitosan sodium alginate polysaccharide system and a composite buffer system is adopted, and the viscosity is controlled to be 200-320 millisecond, the particle size of spray droplets is 40-60 microns, and the thickness of a thin film is 10-30 microns through specific molar ratio compatibility and a genipin crosslinking technology. Through accurate regulation and control, the excellent performance that a double-network thin layer is formed under the calcium ion environment that the absorbance retention rate at 520 nanometers is not lower than 90% and the elution rate is not lower than 90% under the irradiation of hundred thousand lux white light is achieved, the technical problems that a traditional endoscope coloring agent is poor in safety, low in stability and insufficient in mucous membrane contrast ratio are solved, and the wide clinical application value is achieved.

The invention discloses a dynamic leaching-spectrophotometric detection method for the release rate of nutrients in a slow-release fertilizer, and relates to the field of agrochemical analys.The detection method comprises the following steps that S1, a slow-release fertilizer sample is placed in a leaching column to be leached, and leachate is collected; s2, sequentially adding a masking agent solution and a chromogenic reagent into the leachate, and carrying out chromogenic reaction; s3, pumping the solution into a double-optical-path flow cell, and measuring absorbance values under a target nutrient characteristic absorption wavelength and a background interference characteristic wavelength; s4, calculating the corrected net absorbance; and S5, calculating the nutrient concentration, and drawing a nutrient release kinetic curve. By adopting a dual-wavelength synchronous detection and real-time dynamic subtraction correction algorithm, the method can eliminate system errors of time-varying background chromaticity, so that accurate and reliable absorbance readings can be obtained at the initial stage of nutrient release even if the nutrient concentration in the leachate is very low, thereby ensuring the authenticity of the initial stage of a release curve and improving the accuracy of nutrient release. And initial release kinetic parameters are accurately captured.

The invention discloses a residual chlorine determination method, and relates to the technical field of monitoring. The method comprises the following steps: immersing a potential type residual chlorine sensor into a standard residual chlorine solution, collecting a potential response value, calculating a response coefficient, and correcting a potential signal of the sensor; denoising the corrected signal by using a multi-scale fuzzy entropy algorithm to obtain a processed signal; color development time, spectral absorbance and environmental parameter data are collected, the processed signals are combined, and four-dimensional historical data are generated through multi-dimensional quantitative fusion; constructing a four-dimensional residual chlorine concentration detection model based on the three-dimensional curved surface model, and training the model by using four-dimensional historical data; inputting four-dimensional real-time data to the trained model, and outputting predicted residual chlorine concentration; and comparing the predicted value with the actual concentration, directly outputting if the error is smaller than a preset threshold value, fusing real-time data into a historical data retraining model if the error is larger than the threshold value, and outputting after iterative optimization. According to the invention, the four-dimensional residual chlorine concentration detection model is constructed, so that the refined determination of the residual chlorine content is realized.

The invention discloses a honey adulteration detection method, which belongs to the technical field of food detection, and comprises the following steps: collecting an absorbance spectrum of a honey sample by using a near infrared spectrometer; extracting characteristic absorbance values A < lambda > 1 and A < lambda > 2 at a 1450 nm water molecule absorption peak and a 1490 nm saccharide molecule absorption peak; the ratio R is equal to A lambda 1 / A lambda 2; and comparing the R with a threshold range of 0.85-1.15 of pure honey so as to judge whether the honey is true or false. The portable device comprises a sample bin, a near infrared spectrum module, a control unit and a human-computer interaction interface, wherein a rotatable sample table is arranged in the sample bin to accommodate a plurality of disposable sample cups. The method abandons a complex black box model, adopts a characteristic wavelength ratio method with clear physical significance, has the outstanding advantages of simple principle, rapid detection (less than 30 seconds), high accuracy, low cost, simplicity and convenience in operation and the like, perfectly solves the problems of expensive equipment, long time consumption, limited identification capability and dependence on professionals in the prior art, and has a wide application prospect. The method is especially suitable for market on-site rapid screening.

A reflective display panel including a first substrate, a second substrate, a liquid crystal layer, a pixel driving layer, a color filter layer, and a polarizer. The pixel driving layer is provided with a reflective layer overlapping the color filter layer. Absorbance of a first filter pattern of the color filter layer is greater than or equal to 0.25 and less than or equal to 0.9 in a wavelength range between 530 nm and 580 nm. Absorbance of a second filter pattern of the color filter layer is greater than or equal to 0.8 and less than or equal to 1.25 in a wavelength range between 630 nm and 680 nm. Absorbance of a third filter pattern of the color filter layer is greater than or equal to 0.95 and less than or equal to 1.3 in a wavelength range between 580 nm and 630 nm.

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 invention relates to the technical field of intelligent detection, in particular to a feed mycotoxin detection method and system based on spectral analysis. The method comprises the following steps: acquiring a near-infrared diffuse reflection spectrum of a feed sample to be detected, constructing an original spectrum vector based on absorbance data of the near-infrared diffuse reflection spectrum, and determining a projection component of the original spectrum vector on a pre-constructed qualified matrix space; subtracting the projection component from the original spectrum vector to obtain a residual vector, and calculating a first-order difference spectrum of the residual vector based on a preset sensitivity weight; and performing local feature weighting on the first-order difference spectrum to determine a weighted feature value, determining a residual entropy value of the residual vector and a range value of the residual vector, and determining a detection result of the to-be-detected feed sample by using the weighted feature value, the residual entropy value and the range value. According to the technical scheme, a more accurate detection result of the mycotoxin of the feed can be obtained.

The invention relates to the technical field of single-walled carbon nanotubes, and provides a single-walled carbon nanotube purity measurement method, system and equipment and a storage medium. The measuring method comprises the following steps: acquiring the ratio of the main peak absorbance of a first energy band absorption region or the main peak absorbance of a second energy band absorption region of an absorption spectrum to the absorption valley absorbance of a first absorption region of a metallic carbon nanotube; acquiring the ratio of the main peak absorbance to the secondary peak absorbance of the first energy band absorption region of the absorption spectrum or the ratio of the main peak absorbance to the secondary peak absorbance of the second energy band absorption region of the absorption spectrum; and constructing a normalized purity function according to the first absorbance ratio and the second absorbance ratio, and obtaining the purity of the single-walled carbon nanotube sample based on the normalized purity function. According to the method, the normalized purity function is constructed, and a mapping table is replaced by a function formula driven by a physical model, so that the dependence on the mapping table is eliminated, the accuracy, the universality and the efficiency of s-SWCNT purity measurement can be remarkably improved, and meanwhile, the operation threshold is reduced.

DEPCT6907 / 10 / 2568 What is provided is an optical cell for receiving the sample in order to measure the concentration of the sample. Methods for measuring light absorption may improve operational capabilities and measurement accuracy. More than a typical device. Optical cell 2 for sample packing used in concentration meter sets for measurement. The sample concentration is measured using an absorbance method that includes a directional packed section 21. Longitudinal and short directions in the horizontal cross-section and 24 projections extending from the sides in the longitudinal direction. Along the length of the packing section 21 in the short direction;

The application discloses a kind of temporary bonding glue and its application.Temporary bonding glue includes polyimide, the polyimide includes big conjugate unit, the conjugate atom number of big conjugate unit is greater than or equal to 40, and big conjugate unit includes at least one of diphenyl ether group, fluorenyl group or indane structural unit;The polyimide further includes at least one of benzotriazole group, nitro group.The application is improved on the structure of polyimide, and the temporary bonding glue is used in wafer processing, so that the absorbance of temporary bonding glue at target debonding wavelength 355nm is significantly increased, thereby significantly reducing threshold debonding energy, and it is expected to reduce the risk of wafer warping, cracking, or surface device failure, improve the life of laser and debonding efficiency.

A wavelength selective absorption filter contains a resin, a coloring agent, and a compound having at least one polar group of a carboxylic acid ester bond, a carboxylic acid amide bond, a sulfonic acid amide bond, a urethane bond, or a sulfonyl bond and a MW≤1,000 where dye includes at least one of dye A having a main absorption wavelength range at a wavelength of 390 to 440 nm and dye D having a main absorption wavelength range at a wavelength of 680 to 780 nm, a 20% value wavelength A with respect to an absorbance maximal value exhibited by a main absorption wavelength is 455 nm or less where dye A is contained, and a 20% value wavelength D with respect to the absorbance maximal value exhibited by the main absorption wavelength is 640 nm or more where dye D is contained, and a display device.

The application discloses a kind of copper azide content trace detection method, the detection method includes: detecting copper azide content: taking the sample to be measured and inorganic acid mixed dissolution, then sequentially adding NaOH solution, buffer solution and copper nitrate solution, using ultraviolet visible spectrophotometer to measure absorbance and calculate corresponding azide radical concentration, determine the content of copper azide and cuprous azide in the sample to be measured by azide radical and copper azide content relationship model;Detect copper azide and cuprous azide: on the basis of measuring copper azide content, determine the content of copper azide and cuprous azide in the sample to be measured by azide radical and copper azide / cuprous azide content relationship model.The copper azide content trace detection method needs simple device of the application, low requirement to equipment, does not need organic solvent or color developing agent, and environmental pollution is small, and sub-milligram level copper azide used in MEMS fuze can be detected.

The application discloses a crude polysaccharide content determination method and system based on multi-standard comparison, and the method comprises the following steps: according to the type of a sample to be measured, matching applicable crude polysaccharide determination standard methods through a preset standard database, and forming a candidate standard list; synchronously performing detection according to the standard methods in the candidate standard list respectively, and obtaining original detection data under each standard method; according to an absorbance sequence, calculating kinetic characteristic parameters under each standard method, and matching through a preset interference characteristic library to obtain a matrix interference type of the sample to be measured; through a preset mutual calibration function, mapping crude polysaccharide content determination values of each standard method to the same reference, calculating calibration deviations of each standard method; based on the calibration deviations and the matrix interference type, obtaining comprehensive quality scores under each standard method, and determining an optimal recommended method according to the comprehensive quality scores. Through mutual calibration and elimination of matrix interference, the optimal detection standard can be automatically recommended.

A spectroscopic method of estimating the cadmium concentration in an aqueous sample including: preparing at least 5 aqueous calibration samples, each calibration sample including water, a pH regulator in an amount such that each calibration sample has a pH of from 8 to 10, an equal concentration of dimethylglyoxime and dissolved cadmium in an amount of from 0 to 12 μg / mL; and, measuring over optical path length (l) the absorbance for each calibration sample of radiation (R) having a wavelength of from 520 to 540 nm, thereby generating calibration data. The method further includes: forming a treated aqueous sample; measuring over the optical path length (l) the absorbance for the treated aqueous sample of radiation (R) having a wavelength of from 520 to 540 nm; generating test data; and, estimating the concentration of cadmium in the aqueous sample from the test data and the calibration data.

The invention discloses an in-vitro biochemical test method for evaluating the anti-wrinkle effect of cosmetics and raw materials. The in-vitro biochemical test method comprises the following steps: step 1, preparing a working solution; 2, preparing a sample solution; step 3, adding an enzyme working solution; step 4, loading samples in groups; 5, adding a substrate and reacting; step 6, developing treatment; step 7, determining absorbance; 8, calculating, analyzing and processing data; and step 9, result judgment: analyzing and evaluating the anti-wrinkle effect of the sample through a statistical means. According to the method, based on a collagenase inhibition test, when peptide bonds between GLY and GLY in Z-GLY-PRO-GLY-GLY-PRO-ALA-OH are specifically hydrolyzed by collagenase, GLY-PRO-ALA is released, and the activity of the collagenase is indirectly evaluated by measuring the change of a light absorption value at 565 nm after the GLY-PRO-ALA reacts with a color developing agent, so that whether a sample to be detected has an anti-wrinkle effect or not is judged. The method is economical and fast, the test process is controllable, the test system is standardized, and result deviation caused by individual difference can be avoided.

The invention relates to a closed-loop control method, device and system for adjusting laser etching through thin film light absorption data and application of the closed-loop control method, device and system, and belongs to the technical field of laser machining. Calculating the laser energy absorptivity of the thin film according to the absorbance data; dynamically adjusting the laser power based on the laser energy absorption rate to adapt to the thickness change of the thin film; and monitoring the etching depth in real time, and forming closed-loop control through a feedback mechanism until the preset etching depth is reached. The closed-loop control device comprises an absorbance acquisition module which is used for acquiring absorbance data of the thin film in the previous process; the data processing module is used for calculating the absorptivity according to the absorbance data and generating a power adjusting signal; the laser power adjusting module is used for dynamically adjusting the laser power; and the depth monitoring module is used for monitoring the etching depth in real time and providing feedback to form closed-loop control.

To provide an ink that combines ejection stability, abrasion resistance, and cleanability. [Solution] The ink contains a quinacridone pigment, a pigment dispersion resin, and an aqueous medium. The supernatant obtained by centrifuging the above ink at 140,000 rpm for 3 hours at 23°C is 25 times diluted, and the ultraviolet-visible light absorption spectrum of the supernatant has a maximum absorbance of 0.16 to 0.40 at wavelengths between 300 nm and 350 nm, and an absorbance of 0.002 or less at 429 nm. In the above ink, the number of coarse particles with a particle diameter of 500 nm or more is 4.0 × 10 8 The concentration is less than or equal to 1 particles / mL. The phosphorus concentration in a 50-fold dilution of the supernatant liquid is between 1.0 ppm and 16.0 ppm.

This application provides a method for preparing gallium oxide (GaO) with enhanced ultraviolet absorbance and a GaO material prepared according to this method. First, a GaO thin film capable of generating ultraviolet absorption is grown on a substrate by magnetron sputtering. The GaO thin film is then annealed. Next, a copper thin film is grown on the GaO thin film by magnetron sputtering, followed by rapid annealing, causing the copper film to crack into copper nanoparticles under heat. This preparation method utilizes copper nanoparticles to enhance the ultraviolet absorption performance of GaO. The process steps are simple and easy to operate, thus effectively reducing the preparation cost. Furthermore, the GaO material prepared by this method shows a significant improvement in ultraviolet absorbance.

The present invention provides excellent visibility of a printed part formed by laser marking. This liquid compression molding material comprises (A) an epoxy resin, (B) a curing agent, (C) an inorganic filler, and (D) a coloring material, wherein the absorbance measured under the following absorbance measurement conditions using a photometer is 3.5 or more. (Absorbance measurement conditions) Measurement sample: a cured product obtained by curing the liquid compression molding material through a heat treatment at 150°C for 60 minutes. Thickness of measurement sample: 260 μm Measurement wavelength: 1064 nm

The invention relates to the technical field of water quality detection, in particular to a wastewater chroma removal rate measuring method, device and equipment and a storage medium. The fitting curve is generated by obtaining the first absorbance and the first concentration data set, basic data is provided for subsequent fitting curve generation, a scientific basis is provided for colorimetric analysis, and the method can also be used for calculating the chromaticity removal effect. In combination with a fitting curve, a second absorbance data set and a removal rate calculation formula, the efficient adsorption time with the highest chromaticity removal rate can be determined, and the problem that the adsorption time is difficult to accurately measure is solved; in a water tank system of grease sample constant-temperature Raman detection equipment, a periodic concentration calculation formula is constructed according to efficient adsorption time and the number of parallel filter elements, the current concentration is calculated in combination with a real-time filtration cycle period, and the chromaticity removal rate is obtained, so that the chromaticity removal effect of a sequencing batch water inlet treatment system is accurately evaluated, and a reliable basis is provided for system optimization.

The invention discloses an online absorbance detection system with a high dynamic range. The online absorbance detection system comprises a flow cell, a multi-light source assembly, a detection assembly and an electronic control unit, the multi-light-source assembly comprises at least two light sources and at least two incident optical fibers, the front ends of the incident optical fibers are arranged in the flow cell at different insertion depths, and the incident optical fibers and the emergent optical fibers form different optical path lengths; the electronic control unit is lightened by driving the light source in a time-sharing manner, and optical signals under different optical paths are synchronously acquired by using the same detection assembly. Through the structural design without a mechanical moving part, a multi-optical-path detection system is constructed by utilizing the difference of the depth of the optical fiber inserted into the flow cell, and by combining a data processing algorithm in the electronic control unit, the optimal optical path is automatically selected according to the signal intensity to calculate the absorbance. The system has the advantages of wide dynamic range, simple structure, high response speed and the like, and effectively solves the problems of limited high and low concentration detection caused by a fixed optical path and abrasion and lag caused by mechanical switching of the optical path in the prior art.

The invention discloses a pretreatment toxin detection method and device based on agricultural products, and relates to the field of trace detection.The detection method comprises the following steps that S1, an agricultural product sample is homogenized, mixed with an ethanol-water solution containing amylase, subjected to an enzymolysis reaction and subjected to ultrasonic treatment, and a sample extracting solution is obtained; s2, adding an inorganic salt demulsifier, mixing, and centrifuging to obtain a sample filtrate; s3, loading the sample to a cation exchange solid-phase extraction column, sequentially leaching and eluting, and collecting an eluent; and S4, concentrating and redissolving, reacting with a color developing agent, measuring the absorbance at a specific wavelength, and calculating the toxin content. Alpha-amylase specific enzymolysis is adopted to destroy a starch net structure, toxin wrapping is avoided, the extraction efficiency is improved, starch colloid is effectively removed through salting-out demulsification and low-temperature centrifugation, a high-clarity extracting solution is obtained, matrix interference is effectively removed, and high-sensitivity and high-reliability visible light detection of trace toxins in high-starch agricultural products is achieved.

This invention relates to a method for calculating the content of a analyte. The method includes: acquiring a complete chromatographic elution curve of the sample corresponding to the sample analyzer, returning to a baseline; detecting the chromatographic elution curve of the sample; based on the absorbance value at the end of the current sample measurement, extracting a segment from the complete chromatographic elution curve from the absorbance value at the end of the measurement to the baseline as a concentration-diffusion curve; correcting the chromatographic elution curve of the sample using the acquired concentration-diffusion curve; and calculating the content of the analyte based on the corrected chromatographic elution curve. This invention also relates to a detection system and sample analyzer using this calculation method. This invention can correct for the influence of sample residues on detection.

A method for measuring the concentration of phthalic dicarboxaldehyde (OPA) in a sample is provided. The method includes measuring the absorbance of the OPA at a specific wavelength using a spectrophotometer, and converting the absorbance value as a function of temperature (slope) into a concentration value using a standard curve. The methods are specific (selective), simple, rapid, and highly accurate, making them suitable for use in various applications, such as monitoring OPA concentrations in disinfection / sterilization industrial environments.

The application discloses an arrayed chemical molecule detection system based on an organic electrochemical transistor, which comprises a multichannel OECT sensor array, a full-spectrum light source, a detector, a main control circuit and a motion module. The full-spectrum light source irradiates the sample in the multi-well plate, the detector detects the full-spectrum absorbance of the sample in the multi-well plate, the main control circuit controls the electrode voltage of the OECT in the multichannel OECT sensor array, and the electrode current of the OECT in the multichannel OECT sensor array is detected. The application can simultaneously measure the full-spectrum absorbance data of the sample and the current data of all channels of the multichannel OECT sensor array under different voltages, so that the biochemical molecule concentration and the optical characteristics are simultaneously detected, the incubation and other links are saved, the current signal generated by electrocatalysis can be detected, the current concentration is calculated according to the signal, and a curve diagram is displayed. The application is widely applied to the technical field of molecule detection.

The present application relates to the field of spectral analysis, and relates to an absorption spectrometer and a direct measurement method of absorption light intensity. The present application provides an absorption spectrometer which can directly measure absorption light intensity. The absorption spectrometer comprises a light source assembly, a sample cell, a semi-transparent mirror and a light detector. The absorption spectrometer also provides a direct measurement method of absorption light intensity. In the front light path of two coherent lights, a same sample cell is placed in each light path. The optical path of one light is adjusted until the output of the light detector included in the absorption spectrometer is minimum. Then, a sample to be measured is added to one sample cell, and a blank solution is added to the other sample cell. At this time, the light detector measures the intensity of the remaining light which is not completely cancelled after the convergence of the two lights, i.e. the intensity of the light absorbed by the sample to be measured, i.e. the absorption light intensity. The absorption spectrometer provided by the present application detects absorption light intensity, while the traditional absorption spectrometer detects absorbance. Changing the detection of absorbance to the detection of absorption light intensity can avoid the quantum noise of a large signal from drowning out a weak signal, thereby greatly improving the detection sensitivity of the absorption spectrometer.

The application belongs to the technical field of tea component detection, and relates to a tea detection equipment control method and device, computer equipment and a storage medium, which comprises the following steps: acquiring state data of a tea sample, determining light beam parameters of a detection light beam corresponding to the tea sample according to the state data, and generating a detection start instruction based on the light beam parameters; controlling the detection equipment to emit the detection light beam to the tea sample according to the detection start instruction; receiving a spectrum signal reflected by the tea sample, determining target absorbance data of the tea sample according to the spectrum signal; and determining a target concentration value corresponding to a component to be detected of the tea sample according to the target absorbance data, the state data and a preset correction quantitative model. The application significantly improves the accuracy and stability of the nondestructive detection result of tea.

The application discloses a kind of anti-toppling water environment monitoring devices, it is related to chemical or physical analysis technical field, including monitoring box, monitoring box bottom is sequentially clamped with leveling mechanism and anti-toppling mechanism for monitoring box detection its level and stable placement from top to bottom, anti-toppling mechanism is equipped with the fixed mechanism for adjusting angle until monitoring box is horizontal state;The horizontal state of monitoring box can be guaranteed by placing monitoring box on the placing disc after being supported twice, the horizontal stable support of monitoring box is realized, the inaccuracy of absorbance detection data is improved, the liquid surface in cuvette is not flat, the light path is deviated due to inclination is avoided, and the setting of the structure is superior to supporting and then adjusting the level of monitoring box, the problem that existing monitoring box is difficult to simultaneously guarantee to adapt to different slopes and keep horizontal is solved, the problem that existing support and then adjustment leads to unstable support during adjustment process and causes monitoring box to fall is solved.