30 results about "Ultraviolet detectors" patented technology

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.

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".

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.

This invention relates to the technical field of detecting active ingredients in Ganoderma lucidum and shiitake mushroom oral liquid, and provides a method for simultaneously detecting ergothioneine and ganoderic acid A in Ganoderma lucidum and shiitake mushroom oral liquid, comprising the following steps: detecting Ganoderma lucidum and shiitake mushroom oral liquid using high performance liquid chromatography (HPLC); the HPLC column used is a JADE-PAK NH2 column, the column temperature is 30-40℃, the detector is an ultraviolet detector, and the detection wavelength is 252-256nm; the mobile phase includes mobile phase A and mobile phase B, mobile phase A is an acetonitrile solution, mobile phase B is a 0.1% (V / V) aqueous solution of acetic acid, the volume ratio of mobile phase A to mobile phase B is (74-76):(24-26), and the flow rate of the mobile phase is 0.9-1.1 mL·min. ‑1 This invention utilizes a JADE-PAK NH2 amino column for the detection of Ganoderma lucidum and shiitake mushroom oral liquid, and through optimization of chromatographic conditions, enables accurate and rapid simultaneous determination of the contents of ganoderic acid A and ergothioneine in Ganoderma lucidum and shiitake mushroom oral liquid.

The present application discloses a high-sensitivity gallium oxide ultraviolet detector, a manufacturing method therefor, and a use thereof. The high-sensitivity gallium oxide ultraviolet detector comprises an n-type gallium oxide channel layer, a p-type photoresponsive floating gate, a patterned photoresponsive floating gate dielectric layer, a first electrode, and a second electrode; the p-type photoresponsive floating gate is arranged on the n-type gallium oxide channel layer; the patterned photoresponsive floating gate dielectric layer is arranged between the p-type photoresponsive floating gate and the n-type gallium oxide channel layer and is completely covered by the p-type photoresponsive floating gate; the first electrode and the second electrode are arranged on the n-type gallium oxide channel layer, and are in ohmic contact with the n-type gallium oxide channel layer; the concentration of p-type impurities in the p-type photoresponsive floating gate is much higher than the concentration of n-type impurities in the n-type gallium oxide channel layer; the patterned photoresponsive floating gate dielectric layer has a thickness of 10 nm-30 nm and a duty cycle of 10%-90%; and under illumination, the width of a depletion region in the n-type gallium oxide channel layer varies with the duty cycle of the patterned photoresponsive floating gate dielectric layer.

This invention discloses an ultraviolet detector and its fabrication method, applicable to the semiconductor field. The detector includes: a substrate; a p-GaN layer located on one side of the substrate, the p-GaN layer including a p-GaN gate layer in a first region; a barrier layer located on the surface of the p-GaN layer facing away from the substrate; a channel layer located on the surface of the barrier layer facing away from the substrate, the channel layer including a nano-bump array in the first region and a remaining channel layer in the first region; the remaining channel layer is disposed between the nano-bump array and the barrier layer; and a passivation layer located on the surface of the channel layer facing away from the substrate. The barrier layer and the channel layer form a two-dimensional electron gas, and the p-GaN gate layer, barrier layer, and channel layer form a built-in electric field; the nano-bump array and the passivation layer form a polarized electric field; the built-in electric field at least covers a portion of the sidewalls of the nano-bump array. The ultraviolet detector achieves low dark current, high responsivity, and high response speed under the action of the built-in electric field and the polarized electric field.

This invention provides a Si-doped lithium gallium oxide thin-film solar-blind ultraviolet detector, its fabrication method, and its application. The fabrication method includes the following steps: mixing SiO2, Li2CO3, and Ga2O3 polycrystalline powders, and using a solid-state reaction method to obtain Li... y (Ga 1‑x Si x 5O8 polycrystalline target material; Li was prepared on the substrate using pulsed laser deposition. y (Ga 1‑x Si x )5O8 thin film; subsequently in Li y (Ga 1‑x Si x Electrode deposition on 5O8 thin film. Compared with undoped Si Li 0.9 Compared with Ga5O8 thin-film detectors, the solar-blind ultraviolet detector provided by this invention has improved the on / off ratio, responsivity, and detectivity by up to 1177 times, 1130 times, and 1153 times, respectively, and shortened the response time by up to 0.5 s. It has stable working performance and can be applied to fields involving solar-blind ultraviolet signal detection, such as forest fire monitoring and missile exhaust tracking.

This invention discloses a communication method, system, storage medium, and device based on a solar-blind ultraviolet detector. The method includes: constructing a fixed-duration frame structure containing a synchronization segment, a control segment, a data segment, and a protection segment, and formulating a unified communication protocol; the transmitting end converts the input digital signal into a binary bit stream and frames it, determines the number of bits carried by a single symbol based on the APPM modulation order and amplitude level, and transmits an ultraviolet light signal through bit grouping, symbol mapping, Gaussian pulse shaping, digital modulation, and electro-optic conversion; the receiving end converts the ultraviolet light signal into an electrical signal, extracts pulse feature parameters after filtering, adaptive shape Gaussian matched filtering, and timing synchronization, demodulates to obtain a bit stream, and performs frame parsing to extract valid user data; frame synchronization and bit synchronization are achieved throughout the process through a synchronization control module to ensure timing matching between the transmitting and receiving ends. This invention enhances the system's adaptability to channel time-varying characteristics and environmental interference, and improves communication confidentiality and reliability.

The present application relates to a back-illuminated ultraviolet avalanche photodiode based on delta-doping and a preparation method thereof, comprising: an N-type doped silicon substrate layer; an intrinsic multiplication region I layer, an epitaxial P-type doped silicon layer and a P-type boron delta-doping layer which are sequentially stacked in a direction away from the N-type doped silicon substrate layer and located above the N-type doped silicon substrate layer; wherein the N-type doped silicon substrate layer is located at the back light side of the back-illuminated ultraviolet avalanche photodiode, the P-type boron delta-doping layer is located at the light side of the back-illuminated ultraviolet avalanche photodiode, and the P-type boron delta-doping layer is used to perform a surface passivation function; the intrinsic multiplication region I layer is configured to serve as an avalanche multiplication region under a reverse bias, and the epitaxial P-type doped silicon layer and the N-type doped silicon substrate layer respectively serve as electrodes located on both sides of the avalanche multiplication region to form a PIN junction structure. The device can systematically and cooperatively optimize the ultraviolet detector.

This invention belongs to the field of semiconductor device technology, specifically relating to a method for fabricating a flexible ZnO ultraviolet photodetector using full screen printing. Through a full screen printing process, the integrated fabrication of the flexible ZnO ultraviolet detector is achieved. The process is simple, low-cost, and suitable for large-area manufacturing. This invention sequentially fabricates a ZnO photosensitive layer and silver interdigitated electrodes via screen printing, followed by optimized heat treatment and low-temperature curing to form a metal-semiconductor-metal structure device. Through synergistic optimization of ink formulation, printing process, and electrode structure, the photoresponse current is effectively improved while maintaining a high light-to-dark current ratio and responsivity.

This invention relates to an npn-type solar-blind ultraviolet detector using Ga2O3 as the light-absorbing layer and its fabrication method. The detector, from bottom to top, comprises a GaN substrate, a CuI hole transport layer, a Ga2O3 solar-blind ultraviolet absorption layer, a Ti electrode layer, and an Au electrode layer. An In electrode layer is disposed on one side of the CuI hole transport layer on the GaN substrate. This invention uses n-GaN, which has high electron mobility, good thermal stability, and a mature fabrication process, as the bottom substrate; p-CuI, with high hole concentration, high mobility, and excellent p-type conductivity, and good energy level matching with n-GaN and subsequent materials, as the hole transport layer; and n-Ga2O3, with an ultrawide bandgap, high chemical stability, and a high absorption coefficient for solar-blind ultraviolet light, as the light-absorbing layer. Combining the low contact resistance of the bottom In electrode with the high contact area of ​​the top Ti / Au interdigitated electrode improves carrier collection efficiency.

The present invention discloses a high-sensitivity gallium oxide ultraviolet detector, its preparation method and application. The high-sensitivity gallium oxide ultraviolet detector includes an n-type gallium oxide channel layer, a p-type photo-floating gate, a patterned photo-floating gate dielectric layer, a first electrode and a second electrode; the p-type photo-floating gate is disposed on the n-type gallium oxide channel layer, the patterned photo-floating gate dielectric layer is disposed between the p-type photo-floating gate and the n-type gallium oxide channel layer and is completely covered by the p-type photo-floating gate, the first electrode and the second electrode are disposed on the n-type gallium oxide channel layer and form an ohmic contact with the n-type gallium oxide channel layer; wherein, the p-type impurity concentration in the p-type photo-floating gate is much greater than the n-type impurity concentration in the n-type gallium oxide channel layer, the thickness of the patterned photo-floating gate dielectric layer is 10 nm to 30 nm, the duty cycle is 10% to 90%, and the width of the depletion region of the n-type gallium oxide channel layer under illumination changes with the change of the duty cycle of the patterned photo-floating gate dielectric layer.

This utility model discloses an ultraviolet detector, belonging to the field of ultraviolet detection technology. It includes a housing, a lamp chamber at the bottom of the housing, a mounting groove at the bottom of the housing, a mounting frame fitted inside the mounting groove, a liquid storage box fixedly fitted in the middle of the mounting frame, and heat exchange fins fixedly fitted on the top of the liquid storage box. Multiple upper heat exchange plates are provided on the top surface of the heat exchange fins, and multiple lower heat exchange plates are provided on the bottom surface of the heat exchange fins. In this utility model, when the ultraviolet detector is running, the semiconductor cooling chip and cooling fins cool the coolant inside the liquid storage box. Through the cooperation of the heat exchange fins, upper heat exchange plates, and lower heat exchange plates, heat exchange occurs between the high temperature inside the lamp chamber and the coolant inside the liquid storage box, achieving the function of cooling the lamp chamber and ensuring efficient heat dissipation within the lamp chamber. Furthermore, it can also cool the lamp chamber when the external temperature is high, demonstrating good practicality.

A solar-blind ultraviolet detector and a preparation method therefor. The solar-blind ultraviolet detector comprises: a substrate, the material of which is lithium niobate; a first electrode, which is disposed on a surface of the substrate and comprises a first external connection region and a finger region that are connected to each other, wherein the first external connection region is used for connecting to a common ground terminal, and the finger region comprises a plurality of adjacent first finger structures; and at least one second electrode, which is disposed on a surface of the substrate and comprises a second external connection region and a photosensitive region that are connected to each other, wherein the second external connection region is used for connecting to a positive electrode of a corresponding external power source, a negative electrode of the external power source is connected to the common ground terminal, the photosensitive region comprises at least one second finger structure, and the second finger structure extends into the space between a pair of adjacent first finger structures. The solar-blind ultraviolet detector has the advantages of low cost, ease of large-scale manufacturing, etc.

The application discloses a metal nanoparticle modified gallium oxide film solar blind ultraviolet detector and a preparation method thereof, and relates to the technical field of surface modification of metal materials. The application replaces traditional noble metal materials with inexpensive metal nanoparticles, utilizes the localized surface plasmon resonance effect of the inexpensive metal nanoparticles in the solar blind ultraviolet band, and combines the interface barrier between the gallium oxide layer to realize synergistic regulation, so that a surface modification function structure is constructed on the surface of the gallium oxide photosensitive layer. The device can realize synergistic optimization of light absorption enhancement, efficient separation and transport of photo-generated carriers and effective suppression of dark current, has good solar blind wave band selection characteristics, and has significantly improved photoelectric detection sensitivity, light and dark current matching characteristics and working stability. The overall preparation process is simple, compatible and controllable in cost, and is suitable for industrialization popularization and practical application of gallium oxide-based deep ultraviolet solar blind detector devices.

The application provides a method for determining the content of pranlukast, which is suitable for the technical field of quality control of organic chemical synthetic bulk drugs, and especially suitable for accurate content detection in the production process of pranlukast bulk drugs. The analysis method overcomes the limitations of tailing and asymmetry of pranlukast chromatographic peak in the prior art, optimizes the composition of the mobile phase and the chromatographic conditions, shortens the analysis time, and improves the detection sensitivity and accuracy. The application adopts high performance liquid chromatography, the chromatographic column is a silica gel bonded octadecylsilane column, the ultraviolet detector is used, the mobile phase is a phosphate buffer solution containing ion pair reagent sodium heptanesulfonate and an organic solvent acetonitrile, and the separation and detection are carried out in an isocratic elution mode. The method has good separation degree, strong specificity, high precision and good repeatability, and meets the methodological verification requirements of the content determination of pranlukast.

The application discloses a detection method of a degradation impurity 3-methyl-1-propanol in a fudosteine oral solution, relates to the technical field of drug degradation product analysis, and solves the technical problem that a quantitative analysis method for the degradation product 3-methyl-1-propanol in the fudosteine oral solution is lacked in the prior art; the detection method is high-performance liquid chromatography, a chromatographic column with octadecylsilane bonded silica gel as a filling agent is used, an ultraviolet detector is used, an organic solvent aqueous solution is used as a mobile phase, and isocratic elution is used; wherein the organic solvent in the mobile phase is methanol or acetonitrile; the method is high in specificity, high in sensitivity, good in accuracy, can effectively determine the content of the 3-methyl-1-propanol in the fudosteine oral solution, and thus guarantees controllable quality of the fudosteine oral solution.

The application discloses a kind of high-stability composite conductive film, composite conductive film includes silver nanowire film and its surface protective layer, the protective layer is that acetylacetone hafnium is formed in the mixed solvent of methanol, ethylene glycol methyl ether and glacial acetic acid as hafnium source, then the protective layer precursor solution of forming is spin-coated on the surface of silver nanowire film, then the film layer of composite component formed by annealing.The application is prepared with acetylacetone hafnium precursor solution, and the dense protective layer of complex component composition is prepared on the surface of silver nanowire film, to form composite conductive film, to form complete package to silver nanowire film, to ensure that conductive film has high light transmittance, effectively improve the interface bonding force of conductive film and conductive device, improve charge collection efficiency and transmission stability, to improve the detection performance of detector, simultaneously make that ultraviolet detector has good environmental stability.

The application discloses a detection method of related substances in ganiret acetate, and belongs to the technical field of drug analysis. The detection method comprises the following steps: weighing ganiret acetate sample, dissolving the ganiret acetate sample to prepare a test sample solution; measuring the test sample solution, diluting the test sample solution to prepare a control solution, and respectively injecting the test sample solution and the control solution into a liquid chromatograph; adopting octadecylsilane bonded silica gel as chromatographic column filler, adopting an ultraviolet detector for detection, selecting hexafluorophosphate buffer as mobile phase A and acetonitrile as mobile phase B for gradient elution, recording a chromatogram, and calculating the content of related substances according to a self-control method. The application can effectively detect process impurities Des-Tyr 5 -Ganiret acetate and Des-D-Ala 10 -Ganiret acetate, the method has strong specificity, good repeatability and high accuracy, and can effectively control the product quality of ganiret acetate.

This invention discloses a communication method, system, storage medium, and device based on a solar-blind ultraviolet detector. The method includes: constructing a fixed-duration frame structure containing a synchronization segment, a control segment, a data segment, and a protection segment, and formulating a unified communication protocol; the transmitting end converts the input digital signal into a binary bit stream and frames it, determines the number of bits carried by a single symbol based on the APPM modulation order and amplitude level, and transmits an ultraviolet light signal through bit grouping, symbol mapping, Gaussian pulse shaping, digital modulation, and electro-optic conversion; the receiving end converts the ultraviolet light signal into an electrical signal, extracts pulse feature parameters after filtering, adaptive shape Gaussian matched filtering, and timing synchronization, demodulates to obtain a bit stream, and performs frame parsing to extract valid user data; frame synchronization and bit synchronization are achieved throughout the process through a synchronization control module to ensure timing matching between the transmitting and receiving ends. This invention enhances the system's adaptability to channel time-varying characteristics and environmental interference, and improves communication confidentiality and reliability.

A solar-blind ultraviolet detector and a preparation method therefor. The solar-blind ultraviolet detector comprises: a SiO2 / Si substrate; an electrode layer, which is disposed on the SiO2 / Si substrate; an absorption layer, which is disposed on the electrode layer, wherein the material of the absorption layer is lithium niobate; and a transparent conductive layer, which is disposed on the absorption layer, wherein a 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, ease of large-scale manufacturing, etc.

This invention discloses a method and system for detecting luteolin, relating to the field of luteolin detection technology. The system includes a sample placement device, a temperature control device, a switching component, a testing device, and a liquid holding device. A servo motor drives the outer octagonal interface to reciprocate via a transmission shaft. The outer octagonal interface, through an ultraviolet detector, drives the test hemisphere to reciprocate, achieving a slight shaking and agitation of the sample solution, ensuring better mixing of the various components and preventing precipitation. An electric actuator on the side of the transmission shaft drives the connector base to slide downwards, causing the inner octagonal plug to be pulled out from the lower end of the outer octagonal interface. The sample placement base is then manually opened, and the test hemisphere is manually rotated so that the opening of the transparent test tube faces downwards. The sample solution inside the transparent test tube flows downwards through the gap in the rubber flap. The flowing sample solution mixes together and flows from the lower opening of the concave surface of the hemisphere into the lower half of the heat-insulating shell for collection. The collected mixture is then discharged through the drain port.

The application discloses a high-efficiency liquid chromatograph ultraviolet detector, which comprises a main detector shell, a liquid inlet assembly, a separation and detection assembly and a recognition assembly.

A solar-blind ultraviolet detector and a preparation method therefor, which are applied to the technical field of photoelectric detection. The solar-blind ultraviolet detector comprises: a substrate, wherein the material of the substrate is lithium niobate, and the upper surface of the substrate is provided with two opposite vertical trenches; a first electrode, which is disposed in one of the vertical trenches; and a second electrode, which is disposed in the other vertical trench, wherein a voltage bias is applied between the first electrode and the second electrode. The solar-blind ultraviolet detector has the advantages of low dark current, high response performance, ease of large-scale manufacturing, device miniaturization, etc.

This invention relates to a high-performance lithium-doped nickel oxide / zinc oxide / silicon heterojunction ultraviolet detector, its fabrication method, and its applications. From bottom to top, an n-type Si wafer, an n-type ZnO interlayer, and a lithium-doped p-type NiO thin film are stacked sequentially. A top electrode layer is disposed on the upper surface of the lithium-doped p-type NiO thin film layer, and a bottom electrode layer is disposed on the area of ​​the n-type Si wafer not covered by the n-type ZnO interlayer and the lithium-doped p-type NiO thin film layer. This invention uses magnetron sputtering to sequentially fabricate the n-type ZnO interlayer and the lithium-doped p-type NiO thin film layer on the n-type Si wafer, and uses electron beam evaporation to fabricate the top and bottom electrode layers. Compared with existing technologies, the heterojunction ultraviolet detector fabricated by this invention exhibits both low dark current and low visible light response, and the process is simpler, lower in cost, and can be fabricated on a large area with high feasibility for mass production.

The application relates to a gallium oxide-aluminum oxide-based solar blind ultraviolet detector and a preparation method thereof, which comprises a substrate, Ga2O3 nanowires grown on the substrate, an Al2O3 nanolayer deposited on the surface of the Ga2O3 nanowires, and the Al2O3 nanolayer and the Ga2O3 nanowires form Ga2O3 / Al2O3 nanowires, and all the Ga2O3 / Al2O3 nanowires constitute a composite material layer; two electrodes are arranged on the composite material layer. The application utilizes a CVD growth mechanism to directly grow Ga2O3 nanowires on the substrate, and the bulk compound semiconductor does not need to be etched, so that the compatibility of the semiconductor and the substrate is improved. The application deposits an Al2O3 nanolayer on the surface of the Ga2O3 nanowires, introduces the Al2O3 nanolayer as a cladding layer, greatly reduces the dark current, and to a certain extent, reduces the oxygen adsorption and the carried-away electrons, so that the on-off ratio is increased, and the response is improved.

A kind of modular full-automatic protein chromatography purification system, it is related to the technical field of biopharmaceutical equipment, including shell, piston pump, pressure sensor and ultraviolet detector are equipped on the outer wall of shell side, fluid inlet end of piston pump is connected external sample solution device, fluid outlet end is connected the inlet of external chromatographic column by pipeline;Pressure sensor is connected on the pipeline between piston pump and external chromatographic column;Ultraviolet detector is connected at the outlet of external chromatographic column by pipeline;Front surface of shell is inlaidly provided with industrial computer, industrial computer is connected piston pump, pressure sensor and ultraviolet detector respectively by serial communication;Man-machine interaction page is configured on industrial computer, man-machine interaction page includes system function area, data display area and curve display area.The utility model can realize the automation control of protein purification process, with accurate ultraviolet absorption detection, pressure detection and perfect data management function.