160 results about "Ultraviolet detectors" patented technology

The invention discloses a gallium oxide solar-blind ultraviolet detector based on selective area etching and a preparation method thereof, and belongs to the technical field of semiconductor photoelectric detection. Comprises from bottom to top: a substrate; the first epitaxial layer is located on the substrate, and the first epitaxial layer is a highly doped n-Ga2O3 layer; the second epitaxial layer is located on the first epitaxial layer, and the second epitaxial layer is a lightly doped n-Ga2O3 layer; the third epitaxial layer is located on the second epitaxial layer, the third epitaxial layer is a highly-doped p-NiO layer, and the third epitaxial layer is distributed at intervals through selective area etching; and the first ohmic contact layer is located on the area where the third epitaxial layer is distributed at intervals. The detector adopts a PN junction structure working in a reverse bias state, and compared with a Schottky structure, the detector has the advantages that the built-in electric field intensity and the leakage current level of a device are less affected by high-energy photon irradiation and working environment temperature change, and the anti-irradiation performance of the device and the working capability under an extreme temperature condition are effectively improved.

The invention relates to the technical field of iodide content detection, in particular to a method for determining radiochemical purity and iodine content of sodium iodide capsules for diagnosis by HPLC (High Performance Liquid Chromatography), which comprises the following steps: setting chromatographic conditions, and connecting a radioactive flow detector and an ultraviolet detector in series; preparing a disodium hydrogen phosphate solution, a glucose solution, a vitamin C solution, a first control solution, a potassium iodate solution, a second control solution, a carrier solution, a first sample solution, a second sample solution, a negative control solution and a test solution; and determining the radiochemical purity and iodide content of the first sample solution and the second sample solution in three batches based on the chromatographic conditions and the determination standard. According to the method, test parameters such as capsule sample analysis time, a pretreatment mode and a sample size are optimized, the radiochemical purity of the capsule is accurately determined, and the iodide content is controlled, so that the problem that main components cannot be accurately quantified and potential radioactive impurities cannot be detected by a traditional diagnosis sodium iodide [131I] capsule determination method is solved.

The invention discloses a diamond / gallium oxide ultraviolet detector and a preparation method thereof. The diamond / gallium oxide ultraviolet detector sequentially comprises a single crystal diamond substrate, an intrinsic single crystal diamond epitaxial layer, an finger-type ohmic electrode, a gallium oxide layer and a finger-type Schottky electrode from bottom to top, the finger-type ohmic electrode comprises an ohmic electrode strip array and an ohmic electrode pad which are connected with each other; the finger-type Schottky electrode comprises a Schottky electrode strip array and a Schottky electrode pad which are connected with each other; and the ohmic electrode strip array and the Schottky electrode strip array form a different-plane interdigital structure. Defects formed by the diamond layer and the gallium oxide layer are depleted, capture or recombination of interface defects to photon-generated carriers is reduced, electric field distribution can be optimized, collection of the carriers is facilitated, and the performance of the device is improved.

The invention provides a method for detecting taurine in magnesium acetyltaurate, which comprises the following steps: (1) derivatization treatment: carrying out derivatization reaction on a derivatization reagent and magnesium acetyltaurate containing taurine under an alkaline condition to obtain a derivatization product; (2) detection: detecting the derivatization product in the step (1) by adopting a high performance liquid chromatography-ultraviolet detector; wherein the derivatization reagent is selected from the group consisting of 2, 4-dinitrofluorobenzyl cyanide. The determination method has the advantages of high sensitivity, good specificity, simple operation, high accuracy, good reproducibility, good stability and low cost, improves the quality standard of taurine detection in magnesium acetyltaurate, can strictly control the quality of taurine in magnesium acetyltaurate, ensures the safety and reliability of magnesium acetyltaurate, and has a wide application prospect. The practical significance is realized.

The application discloses a method for detecting low-concentration urea in reclaimed water and a continuous online monitoring device, and belongs to the technical field of water quality monitoring equipment. The method comprises the following steps: adding sulfuric acid solution into a water sample to be detected to adjust pH to 3-5, then adding sodium dodecyl sulfonate and ethylenediaminetetraacetic acid to form a urea stable system; concentrating the water sample by vacuum distillation under the condition of 60-80 DEG C; adding a chromogenic reagent and a stabilizing reagent into the concentrated water sample, and reacting under the condition of 65-75 DEG C for 10-15 minutes; and determining the absorbance by using an ultraviolet detector and calculating the urea content. The application further provides a continuous online monitoring device for realizing the method. The application can accurately detect low-concentration urea below 80 mu g / L, the single detection time is less than 30 minutes, the anti-interference capability is strong, and full-process automatic control is realized.

The application discloses a thermoelectric pile structure for calibrating a far ultraviolet ultraviolet detector based on MEMS, which comprises a silicon substrate, a support layer, an absorption layer, a thermocouple pair, aluminum wires, aluminum electrodes and a single crystal silicon material structure on the silicon substrate. The double-layer thermocouple stacking structure is adopted to improve the device duty ratio, more thermocouple pairs can be laid in the case of keeping the size of the one-layer structure unchanged, and the response rate of the detector is improved. The circular structure conforms to the distribution trend that the temperature is radially diffused from the center of the absorption layer to the periphery in a decreasing manner, the hot end of the thermocouple pair can be closer to the area with higher temperature, the temperature of the hot end of the thermocouple pair is more uniform, and the response rate of the detector is improved. The radiant energy of the far ultraviolet ultraviolet radiation source is converted into an output thermoelectric electromotive force, a mathematical model of Fourier's law and the Seebeck effect is established for calculation, and the heat flux density of the far ultraviolet ultraviolet radiation source is measured.

The invention provides a gallium nitride heterojunction ultraviolet detector and a preparation method thereof. The gallium nitride heterojunction ultraviolet detector comprises a first electrode, a substrate, a two-dimensional h-BN layer, a non-doped GaN nucleating layer, a p-type GaN layer and a second electrode which are sequentially stacked. The two-dimensional h-BN layer is inserted to serve as an epitaxial template, so that the preparation process is simplified, the cost is reduced, and high-quality GaN film growth is realized. The two-dimensional h-BN is used as the tunneling layer, the gallium nitride heterojunction photoelectric detector structure is optimized, the atomic-scale thickness and the wide forbidden band energy band structure are utilized, carriers between heterojunctions can efficiently penetrate through the insulating layer through the quantum tunneling effect, an efficient vertical transport path is provided for photo-generated electron hole pairs, and the photoelectric detector efficiency is improved. Meanwhile, the interface passivation effect can effectively inhibit interface scattering and interface recombination, and extremely low dark current is achieved.

The application belongs to the technical field of radar and ultraviolet cooperative detection, and discloses a radar and ultraviolet cooperative detection system for extremely low RCS targets, which is composed of one radar, multiple ultraviolet detectors and a core processor, wherein the radar emits electromagnetic wave signals to space in an active manner, the ultraviolet detectors monitor ultraviolet radiation of targets in a passive manner, and the core processor processes the detected data and realizes cooperative detection of the radar and the ultraviolet system.The application effectively combines the advantages of traditional radar and ultraviolet detection, can make the detection system work effectively in various scenes, combines various target characteristic information detected by the radar and the ultraviolet detector to realize feature fusion judgment, and realizes effective detection of extremely low RCS targets; only when the extremely low RCS target is detected, the corresponding ultraviolet detector is started, so that fast identification and accurate detection of the extremely low RCS target can be realized; in a multi-target combat scene, the extremely low RCS target is effectively identified, so that the combat target is more reasonably planned, and the threat brought by the extremely low RCS target is greatly reduced.

The application discloses a self-correlation instrument based on gallium oxide two-photon absorption ultraviolet femtosecond laser pulse width measurement, and belongs to the technical field of photoelectric regulation and control. The self-correlation instrument comprises a laser generating device, an optical delay system and a self-correlation signal acquisition device. The laser generating device is used for generating a first light beam and a second light beam. The optical delay system is connected with the laser generating device and is used for changing the time when the first light beam and the second light beam reach a sample to be measured. The self-correlation signal acquisition device is used for receiving two-photon photoelectric conversion signal change data caused by the sample to be measured being irradiated by the first light beam and the second light beam in sequence, and obtaining a self-correlation signal based on the two-photon photoelectric conversion signal change data. The application makes full use of the ultraviolet wave band absorption characteristics of gallium oxide to prepare an ultraviolet detector, and uses the self-correlation method to measure the photoelectric conversion signal generated by two-photon absorption of the gallium oxide ultraviolet detector to measure the pulse width of the 350-450 nm near-ultraviolet wave band femtosecond laser.

The invention discloses a gallium oxide film double-array device group for flame detection and identification and a preparation method and application thereof, and belongs to the technical field of semiconductor photoelectric devices and flame monitoring. The device group comprises two arrays which are complementary in function and independent in structure: a Ga2O3 ultraviolet detector array which is grown based on a high-temperature annealing sapphire substrate and is consistent in orientation and is used for performing high-signal-to-noise-ratio rapid detection on flame solar-blind ultraviolet radiation; and the non-oriented Ga2O3 photoelectric synapse array is deposited on the unannealed substrate, and learning and classification identification of flame spatio-temporal characteristics are realized by utilizing plasticity caused by defect capture of the non-oriented Ga2O3 photoelectric synapse array. In the preparation process, the orientation-controlled Ga2O3 active layer and the non-orientation Ga2O3 active layer are respectively obtained by controlling whether the sapphire substrate is subjected to high-temperature annealing treatment or not. The two arrays can form a solution integrating detection and identification. The scheme is simple in structure, low in power consumption, easy to expand and suitable for industrial security and protection, combustion monitoring, forest fire early warning and other scenes.

The application discloses a flexible self-powered day-blind ultraviolet detector based on gallium oxide and a preparation method thereof, which is specially designed for efficient and low-power-consumption ultraviolet light detection in a complex environment. The detector is characterized by asymmetric electrodes and an aluminum oxide passivation layer. Specifically, the first metal electrode and the second metal electrode are located on the gallium oxide film, and the two electrodes can form Schottky and ohmic contacts respectively through different processes and patterned passivation layers by virtue of the difference in material and size, thereby effectively improving photoelectric performance. The first metal electrode realizes high-quality ohmic contact through increasing the contact area, material selection and annealing process. The second metal electrode realizes Schottky contact and improves the contact barrier through material selection and introduction of the passivation layer. The asymmetric electrode design can enhance the built-in electric field and effectively realize the separation of photo-generated carriers, thereby better realizing self-power supply.

The embodiment of the invention provides a solar blind ultraviolet detector and a preparation method thereof. The solar blind ultraviolet detector comprises: a SiO2 / Si substrate; the electrode layer is arranged on the SiO2 / Si substrate; the absorption layer is arranged on the electrode layer, and the material of the absorption layer is lithium niobate; and the transparent conductive layer is arranged on the absorption layer, and voltage bias is applied between the transparent conductive layer and the electrode layer. The solar blind ultraviolet detector has the advantages of low dark current, easiness in large-scale manufacturing and the like.

The invention belongs to the technical field of analytical chemistry, and discloses a method for detecting creatinine in a creatine product, which comprises the following steps: (1) precisely weighing a sample, adding a buffer solution, carrying out vortex oscillation dissolution, volume metering, shaking up, centrifuging, and passing through a water phase filter membrane to obtain a creatine test solution; (2) a creatine test solution is taken, a liquid chromatograph is adopted for liquid phase detection, and the liquid chromatography conditions are as follows: an SCX chromatographic column is adopted, an ammonium dihydrogen phosphate solution is taken as a mobile phase for isocratic elution, an ultraviolet detector is adopted, and the content of creatinine is obtained according to a liquid phase detection result. According to the method, the situation that the detection result of the creatinine in the creatine product is virtually high can be remarkably reduced, accurate quantification of the creatinine byproduct creatinine is achieved, and a more perfect data basis is provided for quality control of the creatine product.

The utility model relates to the technical field of protein purification, and particularly discloses a portable low-temperature protein purification box which comprises a box body, a control panel is mounted at the top of the box body, a temperature sensor is mounted on the inner wall of the box body, and a sample loading module, a purification module, a detection module and a sample collection module are arranged in the box body. The sample loading module comprises a sample liquid storage device, a buffer liquid storage device and a peristaltic pump which are mounted in the box body, the purification module comprises a chromatographic column connected with the peristaltic pump, and the detection module comprises an ultraviolet detector mounted in the box body. Through the design of the low-temperature control system and the heat preservation layer, protein purification can be carried out in a low-temperature environment, the activity of the protein is effectively maintained, and the problem that the protein is inactivated or even degraded due to the fact that the temperature is too high in a traditional purification method is solved; meanwhile, the influence of long-time low-temperature experiments on the body health of experiment operators is avoided.

The application relates to a flexible solar blind ultraviolet detector based on a TiO2 / Ga2O3 nano-phase junction and a preparation method thereof. The detector comprises an Ag upper electrode, a flexible titanium sheet lower electrode, a TiO2 / alpha / beta-Ga2O3 phase junction nanorod array and a graphene / Ag nanowire composite electrode located between the Ag upper electrode and the flexible titanium sheet lower electrode. The flexible titanium sheet serves as a flexible titanium sheet substrate. The TiO2 / alpha / beta-Ga2O3 phase junction nanorod array comprises a TiO2 layer on the flexible titanium sheet substrate, an alpha / beta-Ga2O3 phase junction nanorod array on the TiO2 layer, and the alpha / beta-Ga2O3 phase junction nanorod array comprises a plurality of interval arranged alpha / beta-Ga2O3 phase junction nanorods. The graphene / Ag nanowire composite electrode is located at one end of the alpha / beta-Ga2O3 phase junction nanorod array away from the TiO2 layer, and the Ag upper electrode partially covers the graphene / Ag nanowire composite electrode. The multi-heterojunction structure solar blind ultraviolet detector has stable solar blind characteristics, excellent chemical and thermal stability, and is expected to be widely applied in the field of wearable and portable ultraviolet detectors.

This invention discloses a DMD-based cross-type optical path beam splitter, comprising an ultraviolet imaging lens, a dichroic mirror, a digital micromirror device (DMD), an ultraviolet filter, an ultraviolet detector, a visible light camera, and a light collector, as well as an optical path shield. The DMD is electrically connected to a DMD controller. This invention also discloses an ultraviolet imaging block detection method, including constructing an imaging device based on the aforementioned beam splitter; the beam splitter splits the incident mixed light; an FPGA control module performs multi-layer segmentation iterative scanning to locate the ultraviolet light region generated by corona discharge and generate an ultraviolet image; the FPGA control module simultaneously acquires visible light video signals; the FPGA control module fuses the visible light video signals and ultraviolet image signals and displays them, completing the corona discharge location positioning. This invention solves the problems of delayed corona discharge detection and early warning, high detection equipment cost, and slow imaging speed in existing technologies.

This invention discloses a method for the simultaneous detection of six urease / nitrification inhibitors in fertilizers, resistant to matrix interference. The method is used to simultaneously determine six inhibitors in fertilizers, including thiourea, dicyandiamide, n-butylthiophosphoric triamine, n-propylthiophosphoric triamine, 3,4-dimethylpyrazole phosphate, and 2-chloro-6-trichloromethylpyridine. The procedure includes weighing the fertilizer sample and obtaining a sample extract. A specific chromatographic column and mobile phase are selected, and separation is performed according to a gradient elution program designed for the polarity span of the six inhibitors. An ultraviolet detector or a diode array detector is used, with the detection wavelength automatically switched over time during a single analytical run. Finally, the external standard method is used to calculate the content of each of the six inhibitors in the fertilizer sample based on a standard curve. This invention achieves high-throughput detection with "one injection, six results".

A method for fabricating a lateral photoelectrochemical solar-blind ultraviolet photodetector belongs to the field of detector fabrication technology. The method involves: covering a portion of a conductive substrate with a mask, and fabricating a photosensitive material on the uncovered portion; removing the mask, fabricating a counter electrode on the exposed portion of the conductive substrate, and drilling a hole at the counter electrode location to penetrate the electrode and substrate for electrolyte injection; preparing a high-transparency quartz sheet, and bonding the high-transparency quartz sheet to the above structure using a 50-60 μm thick sarin membrane; subsequently injecting electrolyte through the hole on the counter electrode, and then sealing the hole to form a lateral PEC-type photodetector. In this invention, the PEC photodetector has the photoanode and counter electrode on the same side, i.e., arranged laterally, with the light-incident surface being high-transparency quartz. Compared to detectors using FTO as electrodes, it can achieve a solar-blind ultraviolet detector. Compared to the inverted structure with platinum as the counter electrode on quartz, it has a larger incident surface, higher light absorption efficiency, and higher detection efficiency.

The invention discloses a gallium nitride ultraviolet partial discharge monitoring device, and relates to the technical field of online monitoring and fault diagnosis of power equipment. The device comprises a magnetic type monitoring probe, the magnetic type monitoring probe comprises a probe shell, a magnetic device is arranged on one side of the probe shell, and an optical sensing module, a signal processing module, an intelligent control and diagnosis module, a storage and communication module and a power supply module are integrated in an inner cavity of the probe shell; and the optical sensing module comprises a filtering lens and an AlGaN / GaN heterostructure ultraviolet detector array. The optical sensing module accurately senses ultraviolet radiation and shields background interference, the intelligent control and diagnosis module carries out rapid and accurate diagnosis on the edge side, original data does not need to be uploaded to the background, the response efficiency is greatly improved, the problems that in the prior art, monitoring is not accurate, and diagnosis delay is high are solved, and the monitoring accuracy is improved. And the partial discharge hidden danger of the high-voltage switch cabinet can be found in time.

The invention discloses an organic-inorganic PFO / a-Ga2O3 heterojunction flexible ultraviolet detector and a preparation method thereof, and relates to the technical field of ultraviolet detection. The objective of the invention is to solve the problem that a conventional inorganic material ultraviolet photoelectric detector is difficult to meet the specific requirements of curved surface fitting of wearable equipment. The invention discloses an organic-inorganic type PFO / a-Ga2O3 heterojunction flexible ultraviolet detector. The organic-inorganic type PFO / a-Ga2O3 heterojunction flexible ultraviolet detector comprises a flexible substrate, an a-Ga2O3 thin film layer, a PFO thin film layer and a contact electrode, the organic / inorganic heterojunction structure fully integrates the advantages of an organic material and an inorganic material, photon-generated carriers can be effectively separated through heterojunction, the responsivity of the detector to solar-blind ultraviolet signals can be improved, meanwhile, self-driven low-power-consumption and low-cost preparation is achieved, the requirement for integration of flexible electronic devices is met, and the application prospect is wide. The method has a wide development prospect.

The invention relates to the technical field of chemical analysis, and discloses a high performance liquid chromatography method for long-chain fatty acid derivative impurities, which comprises the following steps: dissolving a test sample by using tetrahydrofuran and acetonitrile (2: 1) as a solvent, using octadecylsilane (C18) as a stationary phase, using an acidic aqueous solution as a mobile phase A, using an acidic organic solution as a mobile phase B, and using an ultraviolet detector as a detector. High performance liquid chromatography is adopted for gradient elution of the impurities of the long-chain fatty acid derivative, and detection is carried out according to the method, so that the method can effectively detect impurities difficult to separate in the impurities of the long-chain fatty acid derivative, and can be used as a detection method for related substances of the long-chain fatty acid derivative. Impurities which are not easy to separate by a conventional C18 chromatographic column are separated under the system, the separation degree of the impurities and main components is relatively good, the accuracy is high, the operation is simple, and the method has a good application prospect.

The invention discloses a method for detecting the content of budesonide, formoterol and glycopyrronium bromide in budeagford inhalation aerosol, and relates to the technical field of drug detection and analysis, and the method comprises the following steps: preparing a test solution and a reference solution; detecting the contents of budesonide, formoterol and glycopyrronium bromide in the test solution and the reference solution by adopting a high performance liquid chromatography ultraviolet detector method; the detection conditions are as follows: octadecyl bonded silica gel is used as a filler, absolute ethyl alcohol-sodium dihydrogen phosphate solution is used as a mobile phase A, absolute ethyl alcohol-sodium dihydrogen phosphate solution-acetonitrile is used as a mobile phase B, and gradient elution is performed; the detection wavelength of the formoterol and the glycopyrronium bromide is 214 nm, and the detection wavelength of the budesonide is 254 nm. The detection method can simultaneously detect the contents of budesonide, formoterol fumarate and glycopyrronium bromide, has good specificity and high accuracy, and can effectively reduce the subsequent detection cost.

This invention provides a method for fabricating a high-performance SiC single-photon ultraviolet detector and the detector itself, relating to the field of semiconductor optoelectronic device technology. The method includes: utilizing the annealing and reflow characteristics of alkaline earth-doped silicon oxide to fabricate a pre-defined n+ type SiC epitaxial layer with spaced hemispherical etching masks; etching the pre-defined n+ type SiC epitaxial layer using the hemispherical etching masks to obtain the n+ type SiC epitaxial layer; sequentially growing an n- type SiC epitaxial layer and a p+ type SiC epitaxial layer on the surface of the n+ type SiC epitaxial layer; and partially etching the pre-defined SiC on the surface of the p+ type SiC epitaxial layer. y N x Windowing of the passivation protective layer yields Si y N x A passivation protective layer is applied; an anode electrode is fabricated on the surface of a portion of the p+ type SiC epitaxial layer, and a cathode electrode and a back reflection layer are sequentially fabricated on the back side of an n+ type SiC substrate to obtain a high-performance SiC single-photon ultraviolet detector. This reduces the detector's power consumption and achieves higher detector performance gain.

The invention relates to a detection enhancement mechanism for an ultraviolet detector, which comprises a workbench, a protection box is fixedly arranged at the top of the workbench through supporting legs, a signal enhancer body is arranged in the protection box, and mounting mechanisms are arranged at four corners of the bottom of the signal enhancer body. A through groove for mounting the mounting mechanism is formed in the bottom of the protection box, the mounting mechanism is used for mounting the signal enhancer body on the top of the workbench, a supporting mechanism for supporting the signal enhancer body is arranged on one side of the mounting mechanism, and a buffering mechanism for buffering and damping the signal enhancer body is further arranged on the mounting mechanism. A protection mechanism is arranged on the outer side of the signal enhancer body; the problems that in the prior art, although quick disassembly and dust prevention of the signal intensifier can be achieved, stability supporting of the signal intensifier in the device in the working process is insufficient, and the signal intensifier is likely to shake in the working process are solved.

The application belongs to the technical field of wide band gap semiconductor photoelectric detection devices, and relates to a vertical structure GaN-based p-i-n type ultraviolet detector on a metal molybdenum substrate. Metal molybdenum is used as a substrate, there is a patterned back electrode layer on the upper surface of the metal molybdenum substrate, there is a molybdenum diffusion barrier layer on the upper surface of the metal molybdenum substrate which is not covered by the patterned back electrode layer, there are GaN buffer layer, n-type GaN layer, n-type Al x Ga 1‑x N layer, i-type Al y Ga 1‑y N layer and p-type Al z Ga 1‑z N layer are grown in sequence on the upper surface of the patterned back electrode layer and the molybdenum diffusion barrier layer in a lateral epitaxial growth mode, there is a passivation layer on the upper surface of the p-type Al z Ga 1‑z N layer, the passivation layer is slotted until the p-type Al z Ga 1‑z N layer is exposed, and a p-type electrode is arranged in the slot of the passivation layer. The application avoids cracks of each GaN-based film layer in the ultraviolet detector caused by thermal stress, increases spectral responsivity, and reduces response time.

The application relates to a flexible amorphous gallium oxide solar blind ultraviolet detector based on an asymmetric electrode structure and a preparation method and application thereof. The solar blind ultraviolet detector comprises a flexible substrate, an amorphous gallium oxide film layer is arranged on the upper surface of the flexible substrate, an asymmetric interdigital electrode is arranged on the upper surface of the amorphous gallium oxide film layer, and the asymmetric interdigital electrode forms an ohmic contact with the amorphous gallium oxide film layer. The preparation method is as follows: a magnetic sputtering method is adopted, a proper sputtering power is selected, and an a-Ga2O3 film layer is prepared on the flexible substrate after treatment; then, an asymmetric interdigital electrode is prepared on the a-Ga2O3 film layer by adopting an electron beam evaporation method or a magnetic sputtering method. Compared with the prior art, the ultraviolet detector with self-power supply and good working performance in a bending state is obtained by a low-cost and simple experimental method.

The utility model discloses an automatic shutdown device for spark detection, which relates to the technical field of automatic shutdown for spinning spark detection and comprises a barrel body and a conveying pipeline communicated with the barrel body through a connecting plate, a spark detection module is arranged on the surface of the conveying pipeline, and an ultraviolet detector is fixed on the surface of the conveying pipeline through a fixing block. A partition plate is arranged in the barrel body, a rotating motor and a micro pump are fixed on the partition plate, a fixing plate is fixed in the upper end of the barrel body and the connecting plate, a groove is formed in the fixing plate, and nozzles are arranged around the groove in the surface of the fixing plate. According to the utility model, the design structure is reasonable, materials can be monitored in real time through the spark detection module and the ultraviolet detector, sparks can be found quickly and accurately, a shutdown execution unit mechanism can be triggered in time, the sparks are prevented from diffusing along with the materials, the risk of fire hazards is reduced from the source, reliable safety protection is provided for the production environment, and the production efficiency is improved. And the serious consequences of casualties, equipment damage, production stagnation and the like possibly caused by fire disasters are greatly reduced.

The utility model provides an environment-friendly solar radiation automatic tracking and monitoring device, which belongs to the technical field of solar radiation monitoring and comprises a base, a tracking and monitoring component is arranged at the top of the base, a rotating component is arranged on the base, and a lifting component is arranged at the bottom of the rotating component. The tracking and monitoring assembly, the rotating assembly and the lifting assembly are arranged, during use, ultraviolet rays emitted by the sun are detected through an ultraviolet detector, the direction of the sun is positioned and tracked through the ultraviolet rays, and then two first hydraulic rods are started through a controller to incline a bearing plate; and meanwhile, a motor is started, a second bevel gear is driven to rotate, a first bevel gear is driven to rotate, and a base can be driven to rotate, so that the direction of the solar radiation monitor is changed, and the solar radiation is conveniently tracked.

The invention discloses a method for detecting sodium hydrogen sulfite in a compound amino acid injection, which adopts high performance liquid chromatography for detection, and the chromatographic conditions are as follows: a chromatographic column adopts a hydrogen-type sulfonated crosslinked styrene-diethylbenzene copolymer as a filler; a mobile phase is a sulfuric acid aqueous solution; the elution mode is isocratic elution; and the detector is an ultraviolet detector. By adopting the high performance liquid chromatography detection method, the sodium hydrogen sulfite in the compound amino acid injection can be directly, conveniently, quickly, qualitatively or quantitatively detected, and the technical problems of low detection efficiency, complicated operation and the like in the prior art are solved; moreover, an ultraviolet detector is adopted for direct determination, so that the use of a derivative reagent is avoided, and the method has the advantages of environmental protection and convenience. The method provided by the invention has the advantages of strong specificity, high sensitivity, good linear relationship, high accuracy and good repeatability, and can be used for accurately judging the storage state and production quality of the compound amino acid injection.

The invention discloses an ultraviolet detector of a high performance liquid chromatograph, which comprises a main detector shell; the liquid inlet assembly comprises a mobile phase module arranged at the upper end of the main detector shell, a liquid conveying part connected with the mobile phase module and a liquid collecting part arranged on the liquid conveying part; the separation detection assembly comprises a chromatographic component connected with the liquid collection component, a flow cell connected with the chromatographic component and an ultraviolet detection module arranged on the flow cell; the identification assembly is arranged on the ultraviolet detection module, and the main detector shell, the liquid inlet assembly, the separation detection assembly and the identification assembly are in cooperative linkage, so that stable conveying of a mobile phase, ultraviolet light quantitative detection and spectral data identification analysis are realized; the problems that a traditional ultraviolet detector is low in wavelength adjustment precision and grating adjustment and light path environment control cannot be linked are solved in a targeted mode, and the high performance liquid chromatography qualitative and quantitative detection requirements in the fields of drug analysis, environment monitoring and the like can be met.