80 results about "Uv spectra" patented technology

The invention discloses an intelligent safety monitoring method and system for a glass curtain wall, electronic equipment and a storage medium, and relates to the technical field of curtain wall detection. The method comprises the following steps: acquiring multi-source image data of an external facade of the glass curtain wall, wherein the multi-source image data comprises a front view image, an infrared thermal imaging image and an ultraviolet spectrum image of the glass curtain wall, which are acquired at different time periods and different angles; performing registration fusion and identification analysis on the multi-source image data to obtain crack characteristics, deformation characteristics and temperature distribution characteristics of the surface of the glass curtain wall; establishing an abnormal characteristic spectrum of the glass curtain wall based on the crack characteristics, the deformation characteristics and the temperature distribution characteristics; performing spatio-temporal evolution analysis on the abnormal characteristic spectrum to determine a multi-level risk area of the glass curtain wall; and generating a monitoring report of the glass curtain wall according to the multi-level risk area. By implementing the technical scheme provided by the invention, comprehensive monitoring of the glass curtain wall can be realized, so that the monitoring accuracy of the glass curtain wall is improved.

The invention provides a pulse laser deposition process online monitoring device and method, and relates to the technical field of material preparation and process monitoring, the pulse laser deposition process online monitoring device comprises a growth cavity, a substrate supporting mechanism and a target material supporting mechanism which are arranged in the growth cavity, a pulse laser for ablating a target material, and a spectrum acquisition unit, the optical signal acquisition module is used for acquiring an optical signal radiated by plasma plume generated by ablating a target material by the pulse laser; and the spectrum analysis unit is connected with the spectrum acquisition unit and is used for receiving the light signals acquired by the spectrum acquisition unit and analyzing and processing the light signals so as to obtain the state information of the plasma plume. According to the online monitoring scheme, the extreme ultraviolet spectrum diagnosis technology and the pulse laser deposition process are deeply fused, so that the film growth process is accurately controlled, and the process is optimized.

The invention relates to a gas discharge detection method, system and equipment based on an ultraviolet spectrum and a medium. The method comprises the following steps: transmitting a frequency-modulated ultraviolet light beam to a gas chamber to be detected, synchronously collecting and processing a transmission light signal in a branching manner, and simultaneously obtaining a modulated spectrum signal for gas absorption analysis and a discrete photon pulse signal for detecting a discharge event; respectively processing the two paths of signals, and extracting sulfur dioxide concentration information and photon radiation characteristics; fusing the two types of features to construct a dynamic feature vector, and obtaining a discharge state grade by using a dynamic Bayesian network diagnosis model; and finally, combining the concentration and state information, and outputting the membership degree of the discharge duration through fuzzy logic. By adopting the method, the fast process and the slow process of partial discharge can be cooperatively monitored, and the early detection sensitivity and the diagnosis reliability are improved.

Methods and systems for configuring and rendering a fluorescent watermark may include modifying a non-partially reflective / absorptive UV ink from an original UV pattern by blending a minimum amount of partially reflective ink, and ensuring that the non-partially reflective / absorptive UV ink is rendered as part of a fluorescent watermark based on the non-partially reflective / absorptive UV ink. Modification of the non-partially reflecting / absorbing UV ink maintains the appearance of two or more pattern inks as a single color / pattern under office lighting. The fluorescent watermark may then be rendered on a substrate (e.g., paper or other material).

The invention discloses a miniature ultraviolet spectrometer, which comprises a light source assembly, a miniature collimating lens group, a triangular prism, a parallel glass plate, a cylindrical lens and an area array detector, the light output end of the light source assembly faces the incident plane of the miniature collimating lens set, and the emergent plane of the miniature collimating lens set faces the first face of the triangular prism. The emergent surface of the triangular prism is in close contact with the incident surface of the parallel glass plate; the emergent surface of the parallel glass plate faces the incident surface of the cylindrical lens, and is used for refracting light rays close to a total reflection critical angle to form a plurality of light beams; the emergent surface of the cylindrical lens faces the receiving end of the area array detector; and the area array detector processes the received interference fringes to obtain spectral information. According to the micro ultraviolet spectrograph provided by the embodiment of the invention, the light path structure of the spectrograph is simplified, the simplified structure can reduce the loss of light in the transmission process, and more light can reach the detector, so that the accuracy of spectral information is ensured.

The invention discloses a flue gas emission monitoring system which comprises the following steps: synchronously acquiring a mixed signal containing a blackness image, a particulate matter beta ray attenuation value and an SO2 / NOx ultraviolet spectrum on the central axis of the same section of a flue to realize simultaneous and same-domain acquisition of three types of pollutants; after analog-to-digital conversion, inputting into edge computing nodes, and completing real-time joint inversion of blackness, particulate matters and SO2 / NOx by a multi-task convolutional network; the tuning fork array in the sampling pipeline is used for obtaining on-way loss, and a final SO2 / NOx value is obtained through reverse recursive compensation; pixel-level cross-correlation conversion is carried out on the blackness and the particulate matter matrix, so that the blackness and SO2 / NOxx are normalized to the same metering chain; inputting a unified environment compensation model by combining wall temperature, illumination and vibration, and applying consistent dynamic gains to the two; and packaging according to a second level and writing through a block chain. According to the invention, the accuracy, reliability and supervision consistency of flue gas emission monitoring can be greatly improved.

The invention discloses an extreme ultraviolet spectrograph calibration method based on extreme ultraviolet diffraction, and relates to the technical field of spectrograph calibration, and the technical scheme is characterized in that a desktop type XUV light source generation device is used for generating XUV light beams; a diffraction device is arranged on the propagation path of the XUV light beam, so that the XUV light beam is diffracted; taking the FID spectral line of the helium atom 2p-1s as an energy reference point, and deducing part of unknown parameters of the diffraction device and the spectrometer according to the separation distance of + / -1 level diffraction beams measured at the position corresponding to the energy; in combination with a Gaussian fitting method, the positions of 0-level light beams and + / -1-level diffraction light beams at other positions on the detector are obtained, and according to a diffraction formula, energy corresponding to all positions on the XUV spectrometer is inverted; calibration precision is ensured by correcting copper mesh placement angle deviation and CCD image angle deviation. According to the invention, XUV light is diffracted by using the copper net, and global continuous calibration of the energy axis of the spectrometer is realized by combining with a characteristic spectral line with a known wavelength.

The invention belongs to the technical field of pesticide detection, and relates to a method for distinguishing pyriproxyfen technical for pesticide application and hygienic application. According to the method, a pyriproxyfen raw medicine sample is analyzed through a high performance liquid chromatography-diode array detector (HPLC-DAD), and the purpose category of the sample is judged by utilizing isomer chromatography spectrum characteristics (ultraviolet spectrum characteristics). Specifically, the pyriproxyfen active compound for pesticide application only shows a single main peak in a chromatogram; a plurality of chromatographic peaks (main peaks and isomer peaks) can appear on the technical pyriproxyfen for sanitation under specific conditions, and the ultraviolet spectrograms of the peaks are consistent. According to the method, whether a pyriproxyfen isomer peak exists in a sample or not is detected, so that whether the active compound belongs to agricultural application or sanitary application is quickly identified. The method has the advantages of simplicity and convenience in operation, high specificity and high practical application value.

This invention discloses a method for preparing selenized Ophiopogon japonicus polysaccharide, its structural characterization, and its applications. The preparation method includes: dissolving Ophiopogon japonicus polysaccharide in dilute nitric acid, adding sodium selenite, reacting at 50–90°C for 4–12 hours, adjusting the pH to neutral, and obtaining selenized Ophiopogon japonicus polysaccharide after dialysis, concentration, and freeze-drying. Structural characterization was performed using ultraviolet spectroscopy, infrared spectroscopy, and scanning electron microscopy, showing that selenium was successfully linked to the polysaccharide molecule in the form of selenite ester. Multiple cell experiments showed that: CCK-8 assay results indicated that the polysaccharide had no significant toxicity to RAW264.7 cells in the concentration range of 25–100 μg / mL; Griess assay and ELISA results showed that the polysaccharide significantly inhibited LPS-induced release of NO, TNF-α, and IL-6 from macrophages in a concentration-dependent manner; GC-MS analysis of the metabolite lactate revealed its anti-inflammatory mechanism at the metabolic level. Animal experiments showed that the selenized Ophiopogon japonicus polysaccharide significantly reduced the inflammatory response in a mouse skin burn model and promoted wound healing. The process of this invention is simple and the conditions are mild. The selenized Ophiopogon japonicus polysaccharide prepared has good anti-inflammatory activity and can be used to prepare drugs for treating skin burns and inflammation.

The application discloses a method for preparing a low-loss deep ultraviolet optical thin film by ion beam sputtering, comprising the following steps: substrate super-clean pretreatment; ultra-high vacuum environment establishment; low-loss film system material selection; double ion beam collaborative sputtering deposition; interface and stress regulation; in-situ real-time monitoring and post-processing. The application overcomes the problem of high loss of existing deep ultraviolet ion beam sputtering coating, provides a systematic process method, effectively reduces impurity adsorption and structural defects in the film layer through main ion beam sputtering deposition and auxiliary ion beam in-situ bombardment cleaning interface, cooperates with interface gradient regulation and fine stress control process, can adapt to different substrate materials and film system structures, and can be applied in batch to the preparation of optical elements required by deep ultraviolet laser systems and deep ultraviolet spectral analysis instruments; realizes that the thin film absorption loss is less than 5ppm, the surface roughness Ra is less than 0.5nm, the interface defect density is significantly reduced, and the optical performance and stability of the deep ultraviolet element are improved.

The invention discloses a control method and device of a dish washing machine, electronic equipment and a storage medium, and relates to the technical field of intelligent kitchen ware. The method comprises the following steps: when to-be-cleaned tableware is pre-cleaned, controlling an ultraviolet spectrum detection unit to monitor a real-time value of the total organic carbon content in washing water; according to the real-time value of the total organic carbon content, the smudginess grade of the tableware to be cleaned is determined; determining washing modes of the dish-washing machine in a main washing stage and a rinsing stage according to the smudginess grade; wherein the washing modes at least comprise main washing parameters and rinsing parameters, and the main washing parameters and the rinsing parameters of different washing modes are different; the tableware to be cleaned is subjected to main washing according to the main washing parameters, and the tableware to be cleaned is rinsed according to the rinsing parameters. According to the scheme, the novel dish washing machine with the built-in ultraviolet spectrum detection unit is provided, automatic quantification of dirt is achieved through the ultraviolet spectrum detection unit, and the dish washing machine is suitable for different tableware dirt scenes; and the whole process from pre-washing to rinsing is automatic, so that the tableware cleaning efficiency is improved.

The invention discloses a plant polyphenol extraction detection method based on synchronization of liquid chromatography and tandem mass spectrometry, and relates to the technical field of analytical chemistry detection, and the method comprises the following steps: predicting a chromatographic elution window through an ultraviolet spectrum, calculating a dynamic synchronization index by fusing mass spectrum background noise data, and starting a synchronous extraction detection program according to the dynamic synchronization index. In the extraction process, the mass spectrum scanning frequency and the ion trap filling time are fed back and adjusted according to pressure and temperature data monitored in real time; and when a target chromatographic peak appears, triggering mass spectrum monitoring channel switching and recording fragment ion information. And finally, integrating the fragment ion abundance ratio and a chromatographic peak shape parameter to carry out result verification. According to the method, dynamic coordination of extraction, separation and detection links is realized, and the signal-to-noise ratio, the sensitivity and the method adaptability of polyphenol compound detection in a complex sample are improved.

The wire grid polarizers 10 and 30 described herein, and wire grid polarizers made by methods described herein, can have high performance across a broad range of the ultraviolet spectrum and across a broad angle of incidence. These polarizers can be durable (resistant to heat, moisture, ultraviolet light, and oxidation). The polarizer can include an array of wires 15 on a substrate 11. Each wire 15 can have a silicon core 12 and a pair of silicon dioxide ribs 13. The core 12 can be sandwiched between the pair of ribs 13, with each rib 13 adjacent to a sidewall 12s of the core 12. A rib width W13 can be ≥4 nm. Each wire 15 can also include a silicon dioxide cap 14. The core 12 can be encircled by a silicon dioxide ring 17.

The application discloses a method for analyzing chlorophyll a, chlorophyll b and beta-carotene in plant extract, comprising the following steps: S1, using an ultraviolet-visible spectrometer to measure visible spectra of plant sample extract; S2, arranging ultraviolet spectrum data of multiple samples to obtain a bilinear mixed signal number array D, and using MCR-ALS algorithm to decompose the array into a relative concentration change profile matrix C and a normalized spectrum profile matrix S T , and then selecting a pure concentration change profile vector c n and a pure spectrum profile vector s n of the first n single analyte; T S3, for the resolved first n component, using the pure concentration change profile vector c n and the pure spectrum profile vector s n T , reconstructing a pure absorbance matrix Dn=c n ◦s n T ; S4, calculating the concentration: calculating the concentration according to the Lambert-Beer law. The application not only inherits the advantages of the Arnon formula, but also can overcome spectral interference to give more accurate quantitative results.

The invention provides an intelligent water nitrate monitoring system and method based on an unmanned ship, and relates to the technical field of water quality monitoring. A space-time topological grid of a monitored water area is constructed, the unmanned ship executes a water body monitoring task in each monitoring unit of the space-time topological grid of the monitored water area, and an ultraviolet spectrum detection device, an environment monitoring device and a plurality of equipment state sensors synchronously obtain spectrum data, environment parameters and equipment state data; the nitrate monitoring and processing module performs cross analysis of equipment attitude, spectral integrity and environmental interference on the spectral data, the environmental parameters and the equipment state data by using a multi-dimensional verification rule base, identifies abnormal data through a dynamic neighborhood radius algorithm, and starts an intelligent repair algorithm cluster to correct the abnormal data; matching the equipment state data with a fault feature database to determine equipment health state diagnosis; and the cloud management platform receives the corrected nitrate concentration data to generate a nitrate concentration spatial-temporal distribution map and carries out concentration abnormity early warning.

The application discloses a research method for interaction between a new pollutant and DNA, and the method comprises the following steps: using a DFT method in quantum chemistry calculation software to optimize the molecular structure of the new pollutant and deoxy nucleoside; using Multiwfn software to obtain the contribution of each atom to a molecular orbital and atomic charge distribution; finding an electrophilic site of the new pollutant and a nucleophilic site of the deoxy nucleoside; using molecular docking software to perform docking calculation on the new pollutant and a double-stranded DNA fragment and search for an optimal combination position; using a UV-Vis ultraviolet spectrophotometer to perform ultraviolet spectrum titration on the interaction between the new pollutant and the double-stranded DNA; using a super high performance liquid chromatography-mass spectrometry method to perform gradient elution, detecting the deoxy nucleoside through a multiple reaction detection method, calculating a reaction rate, and identifying a deoxyribose unit prone to adduct reaction with the new pollutant; and analyzing the detection result.

The application discloses a kind of deep ultraviolet depolarization spectrometer prism and preparation method thereof, including two right-angle prisms, and deep ultraviolet depolarization optical film between two right-angle prisms;The deep ultraviolet depolarization optical film is the multilayer dielectric film structure of high refractive index medium HfO2 layer, medium refractive index medium Al2O3 layer and low refractive index medium SiO2 layer alternately superimposed, total layer number is not less than 48;The application uses the multilayer dielectric film structure of high refractive index medium HfO2 layer, medium refractive index medium Al2O3 layer and low refractive index medium SiO2 layer alternately superimposed as deep ultraviolet depolarization optical film, effectively solve the problem of deep ultraviolet spectrum depolarization spectrometer, the spectral index satisfies T / R=50 / 50±3% under the condition of 248nm central wavelength, incident angle is 45°, and |Tp-Ts|<4%, it shows that the polarization state of two polarized light polarization is less than 4%, and the ratio of light splitting is accurately controlled in 50:50±3 range, significantly improve the light splitting precision and stability.

The embodiment of the invention discloses a portal frame fault category identification method and related equipment, the inclination angle, the bus voltage, the discharge ultraviolet spectrum and the air insulation strength in the embodiment can cover the structure, the electricity and the environment factors of the portal frame, and the limitation of a single information source is avoided. The method comprises the steps of quantifying probability values of state information to different states based on a preset probability function, calculating belief function values and likelihood function values of the different states according to the probability values, and judging the fault type of the portal frame according to the belief function values and the likelihood function values, so that the fault type is judged based on multi-information-source data. And the fault type discrimination precision is improved.

The invention relates to the technical field of energy storage of iron-chromium flow batteries, and provides an online monitoring method for aging of a negative electrode of an iron-chromium flow battery. The method comprises the following steps: designing a special negative electrode storage tank system to regularly collect trace electrolyte, detecting the content of chromium complex ions Cr (H2O) 6-nCln (3-n) + (n = 0-3) through an ultraviolet spectrum, and associating cycle times to construct an aging mathematical model to form an off-line monitoring database, thereby establishing an off-line monitoring mechanism; the method comprises the following steps: establishing a special online spectrum detection experiment platform, collecting chromium complex ion spectrum data in real time, analyzing a chromium complex ion evolution rule in a charging and discharging stage and a circulating process, analyzing a dynamic behavior and a reaction mechanism of a negative electrode chromium complex ion, and establishing a battery aging online monitoring mechanism; and based on the off-line detection result and a special experimental platform, performing correlation analysis on the chromium complex ion concentration distribution trend, the chromium complex ion concentration attenuation trend and the chromium complex ion formation mechanism, and quantitatively predicting the aging time point of the battery. According to the method, offline structure-activity relationship modeling and an online spectrum analysis technology are innovatively combined, the time hysteresis limitation of traditional offline detection is broken through, and in-situ, real-time and nondestructive monitoring of the iron-chromium flow battery negative electrode aging process is realized. Meanwhile, regeneration intervention on the iron-chromium flow battery at the most appropriate time point can be effectively guided, so that the electrolyte utilization rate is maximized, the service life of the system is prolonged, and the operation and maintenance economy is optimized.

The invention relates to the technical field of quality detection of glass products, in particular to a method for predicting leaching resistance of a perfume glass bottle, which comprises the following steps: S1, preparing a simulation solution containing ethanol, phenoxyethanol and the like with the pH value of 3.0-5.5; s2, establishing an ion migration kinetic model; s3, detecting the relationship between absorbance and sodium ion concentration by using the modified gold nanoparticles through ultraviolet spectrum; and S4, 12 characteristic variables such as glass components and process parameters are input, the model is trained through a random forest algorithm, a predicted value of the sodium ion leaching concentration in 50-365 days is output, and the error is smaller than or equal to 8%. According to the method, multiple influence factors are covered, the detection accuracy and the model applicability are improved, the evaluation period is shortened, the cost is reduced, and reliable guidance is provided for glass bottle optimization and process improvement.

The application provides a DNA nanorobot and application thereof in multimodal detection of PFHxS. The DNA nanorobot provided by the application contains specific functional DNA nanoelements, carries out double cascade amplification reaction, and obtains triple helix DNA which can realize label-free colorimetric sensing, fluorescent double signal sensing and multimodal detection of PFHxS. In the colorimetric sensing detection, the DNAzyme is formed after combination with Hemin, and in the case of ABTS-H2O2 system, the detection limit of PFHxS is 9.5 μM through ultraviolet spectrum analysis. In the fluorescent sensing detection, the DNAzyme is combined with the TFO chain modified with AIE, and realizes label-free fluorescent signal output based on the aggregation-induced emission effect, and the detection limit is 983 nM. The application realizes the multi-signal transduction of PFHxS through double signal amplification, and provides a new strategy for the on-site rapid detection and laboratory sensitive quantitative analysis of PFHxS.

Use of an array of light emitting diodes (LEDs) (UV-LEDs) emitting an ultraviolet spectrum for disinfecting large-scale water streams. The irradiation chamber may irradiate fluid passing through a cylindrical irradiation chamber formed of transmissive material with high power density UV-LEDs arranged in a planar array. The transmissive irradiation chamber may be enclosed within a secondary optical chamber of reflective material, or coated or covered by reflective material. The cylindrical irradiation chamber allows for deployment of a vortex generator to introduce a swirling laminar flow region that causes fluid to flow spirally along the length of the irradiation chamber to balance UV exposure or irradiation between hot spots and dark zones.

The invention relates to the technical field of quality detection of traditional Chinese medicine, and particularly discloses a detection method of a traditional Chinese medicine composition for repairing kidney injury and the traditional Chinese medicine composition.The traditional Chinese medicine composition is prepared by matching poria cocos, astragalus membranaceus, American ginseng and cordyceps sobolifera water extracts according to a specific proportion and being supplemented with zymosan and water-soluble vitamin E. According to the detection method, a high-sensitivity CMOS image sensor is adopted to collect a two-dimensional optical image when components in an HPLC system flow out, and the visibility of a low-concentration signal is improved by combining local contrast enhancement, frequency domain filtering and RO I segmentation; an overlapped peak region is identified through a customized lightweight convolutional neural network model, and the identification precision is improved by fusing multi-scale features, an attention mechanism and a knowledge distillation strategy; constructing an image texture and ultraviolet spectrum multi-modal fusion analysis matrix, and combining principal component analysis and component specificity weight factors to realize accurate quantification; and finally outputting the annotated image and the structured quality report.

The invention relates to laser beam shaping, intended to achieve a controlled intensity distribution, typically a flat-topped distribution, by means of a plurality of laser beam sources having a non-uniform beam intensity distribution (incident Gaussian laser beam in the visible, infrared or ultraviolet spectrum or other higher-order multi-transverse mode). The laser beam homogenization-expander uses a primary beam shaper element or light pipe (light integrator), and a second beam shaper unit or microlens array (MLA), i.e., a second light integrator defining a flat-topped intensity distribution output, to provide a second homogenization level. The invention also includes several optical devices, such as a light diffuser, a mirror, a dichroic filter, a beam shaping lens, a light pipe, and a microlens, to achieve good homogenization at the desired output angle. The invention is designed as a laser source that fully integrates / mixes one or more wavelengths, such as red, green and blue, but can also integrate other wavelengths in the visible / invisible spectrum. If multiple wavelengths are used as the initial laser source, the light engine output can provide good homogenization and color mixing with little noticeable speckles, near flat-topped intensity distribution, and also no visible hot spots or interference patterns. The invention can be used in many applications, such as microscopes, material processing, fluorescence, lighting devices, holography, fiber coupling, and the like, which require the spectral characteristics (narrowband, monochromaticity) of the laser, but at the same time require a uniform distribution of the intensity.

The invention relates to the technical field of flame detection, in particular to an ultraviolet spectrum characteristic enhanced flame detection method and system and a storage medium, and the method is characterized by comprising the following steps: constructing a dual-channel spectrum sensing system; performing real-time spatial difference processing on the dual-channel spectral data; establishing a dynamic self-adaptive judgment threshold based on the historical differential data; performing time domain fluctuation characteristic analysis on the differential signal; and cross validation and fusion decision making are carried out through multi-dimensional features. The invention can solve or at least alleviate the contradiction between the detection sensitivity and the anti-interference capability caused by dynamic strong background interference, provides the ultraviolet spectrum characteristic enhanced flame detection method and system and the storage medium, improves the recognition capability of weak flame signals, effectively inhibits false alarms, and improves the detection accuracy. And high-sensitivity and high-confidence flame detection in a complex environment is realized.

The wire grid polarizers 10 and 30 described herein, and wire grid polarizers made by methods described herein, can have high performance across a broad range of the ultraviolet spectrum and across a broad angle of incidence. These polarizers can be durable (resistant to heat, moisture, ultraviolet light, and oxidation). The polarizer can include an array of wires 15 on a substrate 11. Each wire 15 can have a silicon core 12 and a pair of silicon dioxide ribs 13. The core 12 can be sandwiched between the pair of ribs 13, with each rib 13 adjacent to a sidewall 12s of the core 12. A rib width W13 can be ≥ 4 nm. Each wire 15 can also include a silicon dioxide cap 14. The core 12 can be encircled by a silicon dioxide ring 17.

The present invention belongs to the field of measurement technology and relates to an intelligent correction method for ultraviolet spectrum signals of a seawater nitrate sensor. The method comprises: step one, calculating the absorbance data of each sample at different temperatures; step two, pre-processing the absorbance data using an adaptive wavelet denoising algorithm; step three, performing a linear fit on the pre-processed data within a wavelength range of 240-260nm to obtain a linear equation; the absorbance data obtained after baseline correction is determined to be the absorbance of bromide ions; step four, calculating the molar extinction coefficient of bromide ions, and obtaining a linear relationship between the natural logarithm of the molar extinction coefficient of bromide ions and temperature; step five, temperature correction is performed on the molar extinction coefficient of bromide ions: step six, salinity correction is performed using a salinity credibility factor, and finally the bromide ion absorbance after temperature and salinity correction is obtained. The present invention can effectively solve the problems of bromide ion spectrum overlap interference, random noise, baseline interference and temperature and salinity interference.

The invention relates to the technical field of food processing, and particularly discloses a method for removing pesticide residues in instant tea powder. The method comprises the following steps: preparing instant tea powder containing pesticide residues into a solution, and adding a compound pretreatment agent; pretreatment is performed through a two-stage nanofiltration membrane series system with different molecular weight cut-off; after the trapped fluid is concentrated, a compound resin column is selected for adsorption according to the pesticide residue screening result; online ultraviolet spectrum monitoring is adopted, high-purity ethanol elution fractions are collected section by section, and residual liquid is refluxed and reused; and finally, carrying out vacuum concentration and temperature-controlled spray drying to obtain a zero-pesticide-residue product. Through cooperation of multiple technologies of function protection, multi-stage separation, precise adsorption and intelligent control, the problems of low removal rate of pesticide residues, large loss of active ingredients, deterioration of flavor and the like in a traditional method are effectively solved, the active ingredients and the flavor of the product are reserved while organic phosphorus and pyrethroid pesticide residues are efficiently removed, and the product quality is improved. The international standard is met.

This invention discloses a method and system for preprocessing spectral data of a miniature ultraviolet spectrometer. The method includes: acquiring raw spectral data of the target and determining calibration spectral data; sequentially performing dark current smoothing and dark current removal on the raw spectral data; acquiring the calibration spectral data and performing wavelength calibration on the raw spectral data after dark current smoothing and dark current removal based on the size of the wavelength calibration flag; and performing smoothing processing on the wavelength-calibrated raw spectral data. This invention sequentially performs dark current smoothing, dark current removal, wavelength calibration, and smoothing processing on the raw spectral data, enabling accurate detection of low-concentration gases under conditions of simultaneous measurement of multiple component gases.

The invention discloses an optical path system of a ball-borne ultraviolet spectrograph, which belongs to the field of optical instrument design, solves the problems of low broadband efficiency and poor image quality of the existing optical path, and comprises a front-end receiving and transmitting module comprising a light collecting lens (f is equal to 200mm), an ultraviolet enhanced integrating sphere (the reflectivity is greater than or equal to 90%) and an ultraviolet optical fiber; and the rear-end spectrum detection module comprises a slit (10 [mu] m wide), a collimating lens (f = 79 + / -0.4 mm), a reflection blazed grating, an imaging lens (f = 106 + / -0.4 mm) and a back-illuminated ultraviolet CCD (6.5 [mu] m pixel). The lenses are all made of fused quartz or calcium fluoride materials suitable for the ultraviolet band, and other elements are processed through film coating and the like, so that it is guaranteed that an optical path covers 200-400 nm. And a long slit and aberration optimization design is adopted, so that the spatial dimension image quality is remarkably improved. The optical path has the advantages of being wide in wave band, high in luminous flux, high in image quality and high in integration level.