342 results about "Photometer" patented technology

The invention discloses a ground photometer aerosol parameter inversion algorithm based on integrated machine learning. According to the method, a training data set for training an integrated machine learning model is obtained by adopting a forward radiation transmission simulation model, and the training data set is independent of an aerosol product of an existing algorithm and observation interfered by noise; the algorithm has good generalization ability and is excellent in performance after being used for real observation of a photometer, and inverted aerosol parameters have the ability of representing aerosol types; an aerosol inversion algorithm based on an integrated machine learning model is developed aiming at observation of a ground photometer, and the time for completing aerosol inversion for one time is at a millisecond level; the multi-band and multi-angle radiance observation can be utilized at the same time to invert aerosol parameters of multiple bands at a time; any prior hypothesis and smooth constraint are not needed during aerosol parameter inversion, inversion result loss caused by non-convergence of gradient descent in a numerical inversion algorithm is avoided to a certain extent, and waste of effective observation is reduced.

The invention discloses a method for detecting the purity of a phosphorus-containing flame retardant, and belongs to the technical field of flame retardant detection. The specific test method comprises the test steps of selecting a solvent, preparing a to-be-tested solution, determining the maximum absorption wavelength, determining absorbance, calculating the purity of a sample and the like, and analyzing and processing an experimental result. The solvent is filtered through a 600-mesh screen, the influence of impurities in the solvent on an experimental result is eliminated, and the scientificity of the experimental result is ensured by parallelly determining the average value recorded for three times; the testing method has the advantages of low cost, simplicity and convenience in operation, short detection period and the like, and can realize rapid detection of a plurality of samples based on multiple stations of an ultraviolet-spectrophotometer, so that the working efficiency is improved; meanwhile, the method for detecting the purity of the phosphorus-containing flame retardant provided by the invention can be used for comparing the quality of products from different manufacturers and the batch stability of the products at the same time, and is beneficial for enterprises to control the quality of the products.

A photometric process measurement arrangement and a photometric measurement method The invention refers to a photometric process measurement arrangement (10) comprising a photometric immersion probe (20) comprising a photometer flashlight source (61) for providing photometric light impulses, a photometric detector arrangement (70) comprising a separate wavelength-selective detection element (71, 72, 73), and a photometer control (80) controlling the photometer flashlight source (61) and the detector arrangement (70), The photometer control (80) comprises: An impulse signal integrator (819, 829, 839) for integrating the electric impulses having the impulse intensity (Ui) generated by the detection element (71, 72, 73) of one impulse integration cycle (204; 221; 264), a measurement cycle control (90) for adapting the total number of 20 integrated cycle impulses of an impulse integration cycle (204;221;264) to the impulse intensity (Ui) of the single electric impulses, an A / D-converter (81, 82, 83) for converting the voltage of the impulse signal integrator (819, 829, 839) in an optional compulsory A / D conversion interval (100) after the impulse integration cycle (204;221;264), and an A / D-conversion management module (150) for balancing the total number of A / D conversion intervals (100-111) within a time frame (F), whereas the number of supplementary A / D conversion intervals (101-111) after the compulsory A / D conversion interval (100) depends on the length of the corresponding impulse integration cycle (204; 221; 264).

An embodiment of a spectrophotometric device for measuring blood oxygen saturation includes a light source, a detector for detecting a light signal reflected by a subject's tissue, an electronic data processing unit to calculate blood oxygen saturation based on the light signal, and a motion sensor for detecting a motion signal indicative of motion of the light source and / or the light detector. The electronic data processing unit may discard a light signal measured by the detector if the motion signal detected by the motion sensor exceeds a predetermined threshold value. An embodiment of a method for measuring blood oxygen saturation includes emitting a light signal into a subject's tissue, detecting the light signal reflected by the tissue, calculating blood oxygen saturation using the light signal measured by the detector, and detecting a contact signal indicative of contact between a subject's skin and the light source and / or the detector.

The invention refers to a photometric process measurement arrangement (10) with a photometric immersion probe (20). The photometric immersion probe (20) comprises a photometer flashlight source (61) for providing photometric light impulses, a photometric detector arrangement (70) comprising at least two separate wavelength-selective detection elements (71, 72, 73), and a photometer control (80) controlling the photometer flashlight source (61) and the detector arrangement (70). The photometer control (80) comprises several impulse signal integrators (819, 829, 839) for integrating the electric impulses generated by the detection elements (71, 72, 73), several A / D-converters (81, 82, 83) for converting the voltages of the impulse signal integrators (819, 829, 839) when high-precision-converting trigger ports (H) of the A / D-converters (81, 82, 83) are triggered, and a measuring cycle control (90) with an integration target memory (94) memorizing an integration target voltage value (Ut). The photometer control (80) is provided with a high-precision-request port (93) for synchronously triggering the high-precision-converting trigger ports (H) of all A / D-converters (81, 82, 83) after the voltage of the first of all impulse signal integrators (819, 829, 839) has exceeded the memorized integration target voltage value (Ut).

The invention provides pathological tissue section dyeing equipment and method. The method comprises the following steps: dividing a to-be-dyed lymphatic tissue section into a plurality of dyeing partitions according to the structural characteristics of lymphocyte tissues in the to-be-dyed lymphatic tissue section; dyeing agents with different concentrations are applied to different dyeing partitions according to the reference light transmittance of the lymphocyte tissue to obtain color gradient vectors of the lymphocyte tissue slices, light absorption characteristics of the dyeing partitions are measured through a photometer, and dyeing characteristics are determined based on the light absorption characteristics and the color gradient vectors; obtaining a dyeing image after dyeing the lymph tissue section, extracting deep features of the dyeing partitions from the dyeing image, and determining a dyeing loss value when dyeing the dyeing partitions based on the deep features and the dyeing features; and based on the dyeing loss value, carrying out self-adaptive adjustment on the dyeing agent concentration of each dyeing zone. By adopting the scheme provided by the invention, optimal adjustment on the concentration of the coloring agent in the sample dyeing process can be realized based on the characteristic difference of the cell tissues at different parts.

The invention relates to the technical field of photovoltaic film detection, in particular to photovoltaic film performance detection equipment which comprises a spectrophotometer with an integrating sphere accessory, the integrating sphere accessory is mounted in a sample bin of the spectrophotometer, and a mounting mechanism and a wrinkle generator are further mounted in the sample bin. The wrinkle generator comprises a jacking head for applying local mechanical pressure to the photovoltaic film and an L-shaped jacking rod for applying non-uniform mechanical tension, the wrinkle generator further comprises a transmission part, and the jacking head and the L-shaped jacking rod alternately extend out in the front-back direction under the transmission action of the transmission part so that different wrinkles can be generated on the surface of the photovoltaic film; the light transmittance of the photovoltaic film with different inclination degrees and different wrinkle conditions is detected through the spectrophotometer with the integrating sphere accessory, the method is more suitable for the actual use state of the photovoltaic film, the detection result is more accurate, and more reliable basis is provided for performance evaluation of the photovoltaic film.

The embodiment of the invention provides a preparation method of octahedral Ag2O nano-enzyme and a method for detecting H2O2 through a colorimetric method, and relates to the technical field of H2O2 detection. The method for detecting H2O2 by using the colorimetric method comprises the following steps: step S11, taking a plurality of centrifugal tubes, adding quantitative Ag2O solution and H2O2 with different concentrations into each centrifugal tube, and uniformly mixing; step S12, adding a NaAc-Hac buffer solution and a TMB (Tetramethylbenzidine) solution into each centrifugal tube treated in the step S11 to form an Ag2O-TMB-H2O2 reaction system, heating the Ag2O-TMB-H2O2 reaction system in each centrifugal tube in a water bath for a preset time, and observing the color change of the solution in each centrifugal tube; and step S13, determining a light absorption value of the Ag2O-TMB-H2O2 reaction system at a preset wavelength through an ultraviolet photometer, and recording data. The method for detecting H2O2 through the colorimetric method has the advantages of being simple in operation process, accurate in detection, visual in result and the like.

To provide a molecule capable of recognizing a cytosine-cytosine mismatch in DNA.SOLUTION: A solution of FcDANP represented by the chemical formula below, and three solutions each obtained by mixing FcDANP with one of three DNAs having different base sequences, are measured using an ultraviolet-visible spectrophotometer. In the wavelength range of approximately 375-400 nm, the sample containing FcDANP and the DNA having a C-C mismatch exhibits a significantly higher absorption intensity than the other samples.SELECTED DRAWING: Figure 1

The invention provides a novel back contact photovoltaic cell film color sorting method, and relates to the technical field of back contact photovoltaic cell film color sorting.The novel back contact photovoltaic cell film color sorting method comprises a test table top, a back contact photovoltaic cell is arranged on the upper surface of the test table top, and a first test positioning device is arranged at the upper left corner of the test table top; the upper right corner of the test table board is provided with a second test point, the lower left corner of the test table board is provided with a third test point, the lower right corner of the test table board is provided with a fourth test point, and the center of the test table board is provided with a fifth test point. According to the method, the lightness value (L), the red-green chroma value (a) and the yellow-green chroma value (b) of the battery piece are tested by the spectrum luminosity tester through the Lab color model and are compared with the film color standard value to calculate the color difference value, whether the battery piece has color difference or not can be accurately determined through the HSV color model and the lab color model, operation is easy, production line application is convenient, the situation that color difference pieces are mixed into bulk goods can be eradicated, and the production efficiency is improved. And the product quality is improved.

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.

An anti-reflection film (1) is provided with a transparent base film (2), an anti-reflection layer (3), and an antifouling layer (4) in this order toward one side in the thickness direction. The transparent substrate film (2) is provided with a transparent resin film (21). The anti-reflection layer (3) is an alternating laminate comprising at least one niobium oxide layer (31) and at least one silicon oxide layer (32), and the layer of the anti-reflection layer (3) closest to the antifouling layer (4) is the silicon oxide layer (32). Furthermore, in a difference spectrum calculated from Fourier transform infrared spectrophotometer analysis (FT-IR analysis), when the maximum absorption peak intensity originating from Si-O-Si symmetric scaling near 1050 cm <-1 > is standardized to 1 and the absorption peak intensity originating from Si-O-Si asymmetric scaling at 1200 cm <-1 > is defined as X, 1 / X is 5.0 or more.

The invention discloses an in-situ ultraviolet and visible spectrophotometer with high measurement precision, and relates to the technical field of ultraviolet and visible spectrophotometers, the in-situ ultraviolet and visible spectrophotometer comprises a bottom shell, an optical unit is arranged on the inner wall of the bottom of the bottom shell, and a light source module and a monochromator are arranged in the optical unit; the top of the optical unit is fixedly connected with an operation platform through a supporting rod, the top of the operation platform is provided with a motor mounting frame, the top of the motor mounting frame is provided with a linear motor, the output end of the linear motor is connected with a lifting fixing plate, and the lifting fixing plate is of a Z-shaped structure. The end, away from the linear motor, of the lifting fixing plate is connected with a light shield, and the top of the light shield is provided with an optical fiber clamping frame. According to the method, result deviation caused by dilution multiple estimation errors in a traditional method is avoided, the dilution frequency of the high-concentration sample is reduced, reagent consumption and waste liquid generation are reduced, and the method conforms to the green analytical chemistry concept.

The invention discloses preparation and visual detection application of an Ag / {001} Bi2Fe4O9 nanosheet, relates to the technical field of visual ultra-sensitive detection of 2, 4-dichlorophenol, and aims to realize an in-situ and ultra-sensitive visual detection method for the 2, 4-dichlorophenol. The method comprises the following steps: uniformly mixing a xanthene dye fluorescein aqueous solution, an Ag / {001} Bi2Fe4O9 nanosheet suspension and a 2, 4-dichlorophenol aqueous solution to obtain a solution to be detected; the method comprises the following steps: putting a solution to be detected into a Pomfiley multi-channel photocatalytic reactor, carrying out dark adsorption by stirring without illumination, then starting visible light, carrying out sufficient illumination, filtering by adopting a 22-micron water-phase filtering membrane, and finally testing by adopting an ultraviolet and visible spectrophotometer, thereby completing photosensitization detection of 2, 4-dichlorophenol. According to the invention, the Ag / {001} Bi2Fe4O9 nanosheet can be prepared and applied to visual detection.

The invention discloses an offshore salt mist aerosol monitoring system and method based on a drifting buoy, and relates to the technical field of marine atmospheric environment monitoring, and the method comprises the steps: transmitting the position and time information received by a GNSS receiver to a main control module, and carrying out the resolving of the main control module, and obtaining a preliminary direction; transmitting the data of the attitude measuring instrument to the main control module; the main control module corrects the initial azimuth angle and the elevation angle according to the attitude data, and adjusts the accurate direction of the sun photometer according to the correction result; calculating the optical thickness of the aerosol according to radiation data measured by the sun photometer; the aerosol particle spectrum distribution is inversed according to the aerosol optical thickness; and the main control module performs information interaction on the inverted aerosol particle spectrum distribution and the land through the wireless communication module. The defects of a traditional mode are effectively overcome, and the optical parameters and the dynamic change process of the salt mist aerosol are captured more accurately.

The invention provides a rapid pollutant detection method based on spectral feature analysis, and relates to the technical field of environmental pollutant spectral detection, and the method comprises the following steps: obtaining an original absorption spectrum of a sample, and preprocessing and reconstructing an intrinsic spectral signal; extracting three types of features of morphology, frequency domain energy distribution and phase disturbance, and splicing to obtain a multi-dimensional joint feature tensor; pollutant classification and confidence judgment are completed through an improved CNN, and concentration is predicted through a linear regression model synchronously; in combination with a Mahalanobis distance verification result, deep residual network secondary feature mining is triggered for a low-confidence sample, a final type is determined according to a fusion result, and the concentration is corrected; and generating a detection report and dynamically updating the spectral feature intrinsic library. The method is adaptive to a portable ultraviolet-visible spectrophotometer, the single sample detection time consumption is less than 10min, the classification accuracy is greater than or equal to 90%, the unknown pollutant judgment accuracy is greater than or equal to 89%, and the method is suitable for on-site rapid detection.

A light therapy system is comprised of a pressure cuff system having a cuff positionable on or near a body part of a user and receiving pressurized air to selectively pressurize and depressurize the cuff, and a light emitting system configured to emit light to the cuff. The light emitting system has a support structure and a light emitter positioned on the support structure, the light emitter being controllably powered. The support structure is positionable on the inner surface of the cuff such that the light emitter may direct light onto the body part. The light therapy system may also include a controller capable of controllably providing power to the light emitter, where the controller may adjust an intensity or duration of light directed onto the body part in response to an input or measurement relating to a state of the body part. A photometer may be provided individually or integrally to measure the state of a body part. A method of providing light therapy is also provided.

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 utility model relates to an ultraviolet and visible spectrophotometer, which aims at solving the technical problems that the current cuvette is relatively tight in insertion, relatively large in friction force and not smooth in insertion, and comprises a spectrophotometer shell, a sample chamber, a turning cover, a cuvette groove and a cuvette, the sample chamber is arranged in the spectrophotometer shell; the flip cover is rotationally arranged on the spectrophotometer shell corresponding to the opening of the sample chamber; the cuvette groove is arranged at the bottom in the sample chamber; the plurality of cuvettes are respectively connected with the cuvette groove through a plurality of connecting structures; the connecting structure comprises a U-shaped plate and an abutting elastic piece. The U-shaped plate is arranged in the cuvette groove; the two abutting elastic pieces are arranged on the two sides of the bottom of an inner cavity of the U-shaped plate correspondingly. The cuvette is inserted into the inner cavity of the U-shaped plate, and the two sides of the bottom of the cuvette are matched with the two abutting elastic pieces in an abutting mode respectively. The cuvette has the advantages that the cuvette is inserted into the U-shaped plate, the inner cavity of the U-shaped plate has enough space, the abutting elastic pieces abut against and position the cuvette, and the cuvette is convenient to insert and position.

This invention relates to the field of building materials technology, and particularly to a method for determining and evaluating the performance of ethylene-vinyl acetate redispersible latex powder in reconstitution into an emulsion. The method includes the following steps: dissolving ethylene-vinyl acetate redispersible latex powder in water to prepare a latex powder solution of a certain concentration; allowing the latex powder solution to stand for a period of time, then placing it in an ultraviolet spectrophotometer to measure the transmittance, plotting transmittance curves after different standing times, and obtaining the transmittance value of the ethylene-vinyl acetate redispersible latex powder; combining the transmittance curve trend and transmittance value, evaluating the performance of the ethylene-vinyl acetate redispersible latex powder in reconstitution into an emulsion, and providing corresponding application suggestions. The method of this invention is convenient to operate, highly practical, produces stable test results, and has good reproducibility, serving as a reference for the quality evaluation of redispersible latex powder in mortar applications.

A coating composition, a coating layer, and a coating system, and a method for their preparation and use are provided; the coating system comprises an iridescence index of 2 or higher and comprises a coating layer formed by a coating composition; the coating composition comprises a film-forming resin and a pigment composition; the pigment composition comprises 50% or more by weight of radar-transmitting pigment based on the total weight of the pigment composition and not more than 50% by weight of electrically conductive pigment based on the total weight of the pigment composition; the coating system has a radar signal transmission of 70% or higher;The coating system has a CIELAB color difference, ?E, compared to a coating system of the same color of no more than 4, measured at 110°, using a multi-angle spectrophotometer with D65 illumination and a 10° observer;

The application relates to the technical field of intelligent agriculture and plant protection, and particularly discloses a broccoli black spot early diagnosis system and method based on multi-modal machine learning fusion, which comprises a portable collection platform, a mobile experiment terminal and a server. The portable collection platform is integrated with a hyperspectral imaging camera, a chlorophyll fluorescence imager, a dark-adapted leaf clamp and a camera for sample barcode recognition, and is provided with an adjustable height support and a controllable light source to ensure the consistency of data collection conditions. The mobile experiment terminal is internally provided with a physicochemical index rapid detection module, including a portable PCR instrument for on-site nucleic acid rapid extraction and amplification and a miniature ultraviolet spectrophotometer for rapid determination of pigment content. The broccoli black spot early diagnosis system and method based on multi-modal machine learning fusion are highly integrated, portable and automated, are suitable for a field environment and provide an efficient disease diagnosis tool for non-expert users.

The application discloses a light transmittance test assembly for a polishing pad window and a test device. The test device can comprise a base; and a mount detachably and slidably connected to the base; wherein the mount has a notch part on a solid part, the notch part extends a first slot towards the solid part, and a polishing pad window is at least partially in the notch part after being installed in the first slot. The light transmittance test assembly for the polishing pad window has a mount matched with the polishing pad window, can be directly applied to a spectrophotometer, and improves the measurement accuracy and the measurement convenience.

A wearable smart ring includes an annular body sized to receive a finger, photoplethysmography (PPG) sensors arranged along an inner peripheral surface, and a microfluidic perspiration collector disposed at the inner surface. The collector has microchannels that draw perspiration by capillary action into one or more reservoirs and includes a region that concentrates or retains biomarkers. A docking station mechanically receives the ring for charging and interfaces with the collector to transfer fluid and / or perform in-situ analysis. The dock includes optical instrumentation (e.g., photometry, spectroscopy such as Raman) and may implement pumping and flushing to reset the collector for subsequent use. A controller communicates results by wireless links. The system enables passive collection of perspiration during wear and detailed biomarker analysis during charging, thereby augmenting PPG-derived physiological measurements with perspiration chemistry without burdening ring power or size.

The invention discloses a device and a method for testing spectral performance of a laser film in a variable vacuum humidity environment, and belongs to the technical field of laser film spectral measurement. The equipment comprises an optical test cavity, a vacuum acquisition and regulation module, a humidity regulation module and a control system, the optical test cavity is butted with a test light path of the spectrophotometer and is used for placing a sample to be tested; the vacuum obtaining and regulating module regulates the vacuum degree in the cavity, the humidity regulating module regulates the humidity in the cavity, and the control system coordinates all the modules to work. According to the invention, by efficiently coupling the variable vacuum humidity test cavity and the spectrophotometer, the in-situ test of the multi-band transmittance of the laser film in different vacuum degrees and different humidity environments is realized, and the problem that the traditional atmospheric environment test cannot truly reflect the performance of the film in a variable vacuum and variable humidity composite environment is solved; and a key technical support is provided for design optimization and reliability evaluation of the laser film.

A phototherapy system comprises a pressure cuff system and a light emitting system. The pressure cuff system has a cuff that can be positioned on or near a user's body part and can receive pressurized air to selectively pressurize and depressurize the cuff. The light emitting system has a support structure and a light emitter positioned on the support structure, the light emitter being controllably powered. The support structure can be positioned on the inner surface of the cuff so that the light emitter can direct light onto the body part. The phototherapy system may also include a controller capable of controllably supplying power to the light emitter, wherein the controller can adjust the intensity or duration of the light directed onto the body part in response to inputs or measurements related to the state of the body part. A photometer may be provided separately or integrally to measure the state of the body part. A method for providing phototherapy is also provided.

The utility model relates to a device for detecting fluorine in fluorine-nitrogen mixed gas, which belongs to the technical field of fluorine detection and is characterized in that fluorine concentration is detected by an ultraviolet spectrophotometer according to Lambert-Beer's law by adopting an ultraviolet spectrophotometer, an independent sample cell and an independent reference cell are customized on the ultraviolet spectrophotometer, and the sample cell and the reference cell are used for detecting fluorine concentration. The fluorine-nitrogen mixed gas sample gas and the nitrogen reference gas are respectively introduced, no other substances participate in the reaction in the whole detection process, compared with a fluorine gas detection method in the prior art, the problem of fluorine gas conversion rate does not exist, and the device is more corrosion-resistant and long in service life; the device is provided with a fluorine-nitrogen mixed gas sampling mechanism and a sample gas pretreatment mechanism, and the two mechanisms are replaced through vacuumizing and nitrogen purging before detection, so that the cleanliness of the sample gas can be ensured, the pressure can be accurately controlled, and the stability and the accuracy of fluorine gas detection are improved; the sampling mechanism is integrally arranged in the closed explosion-proof cabinet, so that the leakage of toxic gas is prevented, the working safety is improved, and the environmental pollution is avoided.

The utility model relates to the technical field of flame photometers, in particular to a quick-release flame photometer which comprises a fixed plate, a bottom plate, side plates, a panel and a back plate, the fixed plate is connected to a side plate of the flame photometer body, and the side plate is positioned on the opposite side of the fixed plate; the bottom plate is arranged between the fixed plate and the side plates, and the bottom plate is connected with the bottoms of the fixed plate and the side plates through hinge structures; the face plate and the back plate are connected to the two adjacent edges, connected with the bottom plate, of the side plates through hinge structures respectively. The bottom plate, the side plates, the face plate and the back plate are sequentially unfolded through the hinge structures, so that the ignition box can be quickly disassembled, after the ignition box is unfolded, the bottom plate, the side plates, the face plate, the back plate and the fixing plate jointly form a plane, and sufficient operation space is provided for cleaning tools; therefore, a user can conveniently clean all parts inside the cleaning device, and cleaning dead angles are avoided. The maintenance operation process is simplified, and the cleaning and maintenance time cost of a user is reduced.

The utility model provides a portable ultraviolet and visible spectrophotometer, which belongs to the technical field of photometers, and structurally comprises a portable box group, an ultraviolet and visible spectrophotometer main body is sleeved in a cavity on the top surface of the portable box group, the portable box group comprises a box body group, and a telescopic pull rod piece is vertically arranged in the middle of the bottom surface of the box body group. A rolling and pulling cover group for covering the ultraviolet and visible spectrophotometer main body in a dustproof manner is arranged in the middle of the top surface of the box body group, and a first supporting leg group and a second supporting leg group are respectively arranged at the upper ends of the left side and the right side of the box body group, so that when the ultraviolet and visible spectrophotometer is carried, the portable box group can be moved in a push-pull manner or a lifting manner; the portable box group can be placed on the ground in an inclined angle through the cooperation of the first supporting leg group and the second supporting leg group, and the portable box group can be horizontally placed on the ground through the folding of the first supporting leg group and the second supporting leg group, so that the portable box group has more multi-angle choices during testing, and is convenient to use during field testing.