229 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 a screening method and an activity evaluation method of a natural antioxidant, and the screening method is characterized in that a cerium dioxide-based nano composite material with a specific structure is used as oxidase, a nano oxidase + natural antioxidant reaction system is constructed, and the activity of the natural antioxidant is evaluated through a high performance liquid chromatography-ultraviolet detector-tandem mass spectrometry analysis technology. Screening of the natural antioxidant is realized; according to the activity evaluation method, a cerium dioxide-based nano composite material with a specific structure is used as oxidase, a nano oxidase + natural antioxidant + TMB reaction system is constructed, and the activity evaluation of the natural antioxidant is realized through an oxidized TMB photo-thermal detection technology. According to the method disclosed by the invention, the used reaction system is high in applicability, high in accuracy and good in selectivity.

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 present invention discloses a SiC / Ga2O3 heterojunction single-photon ultraviolet detector and a method for fabricating the same. The method comprises: preparing a device functional layer and etching to form a mesa structure with an angle; depositing a first passivation layer on the upper surface of the mesa structure; etching the first passivation layer and an n+-type Ga2O3 epitaxial layer to form a photosensitive window; depositing Ni / Au metal on the upper and lower surfaces of the device, performing ohmic contact self-alignment, and then performing ohmic contact transparency treatment to form an anode transparent ohmic contact within each photosensitive window and a cathode transparent ohmic contact on the lower surface of the device; forming an anode metal electrode on the upper surface of the anode transparent ohmic contact located on the sidewall of each photosensitive window; forming a second passivation layer on the upper surface of the anode transparent ohmic contact within each photosensitive window, and forming a cathode metal electrode on the lower surface of the cathode transparent ohmic contact. The present invention solves the problem of poor device performance caused by using a single SiC material to fabricate single-photon ultraviolet detectors.

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 invention discloses a synthesis and chiral detection method of N2-[fluorenylmethoxycarbonyl]-L-lysine allyl ester monohydrochloride, and mainly solves the technical problems of complex conventional chiral detection and difficult isomer separation. The synthesis and chiral detection method comprises the following steps: 1, preparing a reagent for preparation; 2, synthesizing a sample; 3, high performance liquid chromatography determination is carried out, an Agilent 1260 chromatographic instrument is adopted, a DAD ultraviolet detector is adopted, CHIRALPAKR AD-H is adopted as a chromatographic column, and a normal hexane solution (A) with the mass percentage concentration being 100% and an acetic acid-ethanol solution (B) with the mass percentage concentration being 0.1% are adopted as mobile phases; the invention provides a reliable and convenient means for improving the N < 2 >-[fluorenylmethoxycarbonyl]-L-lysine allyl ester monohydrochloride chiral detection method.

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 invention relates to the field of analytical chemistry, in particular to a method for detecting N-hydroxysuccinimide in Fmoc protected amino acid, which comprises the following steps: 1) preparing an N-hydroxysuccinimide reference substance solution by using a diluent; 2) dissolving the Fmoc protected amino acid by using a diluent to prepare a test solution; (3) detecting the reference substance solution and the test solution by using a liquid chromatography; chromatographic conditions are as follows: a chromatographic column is an HILIC Amide column taking alkylamido as a stationary phase; a mobile phase A is a 0.1% (v / v) phosphoric acid aqueous solution, and a mobile phase B is acetonitrile; and the detector is an ultraviolet detector. The detection method disclosed by the invention is strong in specificity, high in sensitivity and good in repeatability, and the residual quantity of HOSU in the Fmoc protected amino acid can be rapidly and accurately determined. The detection problem of the HOSU in the Fmoc protected amino acid is solved, and reference and basis are provided for quality control strategies of the Fmoc protected amino acid and polypeptide related drugs synthesized by the Fmoc protected amino acid.

The invention belongs to the field of quality standards and analysis technology detection of drugs, and particularly relates to a method for quantitative determination of hexahydropyridine hydrochloride in tolperidone hydrochloride by high performance liquid chromatography. According to the detection method, a derivatization reagent and an acid-binding agent are used for carrying out a derivatization reaction on hexahydropyridine hydrochloride in tolperidone hydrochloride, so that hexahydropyridine hydrochloride in a sample is converted into a derivative with an ultraviolet absorption functional group, acetonitrile is used as a mobile phase A, a sodium dihydrogen phosphate solution with the pH value adjusted to a specific value by sodium hydroxide is used as a mobile phase B, and the ultraviolet absorption functional group is detected by using a chromatographic column. Elution is carried out in a reversed-phase analysis column, and a high performance liquid chromatography system is matched with an ultraviolet detector to serve as a means for detecting target components. The detection method provided by the invention has the advantages of good separation effect on target components, symmetric chromatographic peak patterns, reasonable retention time and good reproducibility, and provides data support and reference for quality standard formulation of products and rapid screening of preparation processes.

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.

The invention provides a method for simultaneously detecting the content of arginine and citrulline by high performance liquid chromatography. According to the method, high performance liquid chromatography is adopted for detection, and chromatographic conditions are as follows: a zwitter-ion HILIC chromatographic column and an ultraviolet detector are used, a mixed solution of a monopotassium phosphate buffer solution and methanol is used as a mobile phase, and the content of arginine and citrulline is detected. The high performance liquid chromatography detection method does not need derivation, can accurately detect the content of arginine and citrulline at the same time, is short in detection time, good in separation degree of arginine and citrulline, good in peak shape symmetry and high in accuracy, and can meet the detection requirements in the actual production process.

The present invention discloses an ε-Ga2O3-based PIN structure heterojunction solar-blind ultraviolet detector and a preparation method thereof. The detector is made of new materials, and this solution is proposed to address the problems of high power consumption in the prior art. It includes a top electrode, a NiO film, an ε-Ga2O3 intrinsic layer, a 4H-SiC substrate and a bottom electrode stacked in sequence. The preparation steps include: pretreatment of the 4H-SiC substrate; metal organic chemical vapor deposition of the ε-Ga2O3 intrinsic layer; radio frequency magnetron sputtering of the NiO film; and electron beam evaporation to prepare the top electrode and the bottom electrode. The advantage is that the amount of Ga2O3 used is reduced, which can reduce power consumption. ε-Ga2O3 is grown on the 4H-SiC substrate. Based on the excellent thermal conductivity of SiC of 4.9W / cm·K, a large amount of heat in the ε-Ga2O3 intrinsic layer can be transferred from the 4H-SiC substrate. At the same time, the in-plane lattice constant difference between the orthorhombic structure ε-Ga2O3 crystal and 4H-SiC is small, which can improve the crystallization quality of the ε-Ga2O3 intrinsic layer, thereby improving the detection performance of the photodetector.

The present invention provides a method for simultaneously determining low-content active chemical components in Fangji Huangqi Decoction, belonging to the technical field of traditional Chinese medicine component analysis, and comprising the following steps: after decocting the raw materials of Fangji Huangqi Decoction with water, ultrasonic extraction is carried out by using a methanol solution to obtain a test solution, and then the UHPLC-MS / MS method is adopted to precisely absorb the mixed reference solution and the test solution and inject them into an analytical instrument for determination. Compared with the traditional ultraviolet detector, the mass spectrometry can accurately give the mass number information of the precursor ion and the product ion of the analyte while accurately determining the component content, and different from the retention time, the mass number information is more stable, reliable and highly specific as the basis for qualitative identification.

The invention provides a method for detecting B vitamins and application thereof. The vitamin B is one or more of vitamin B1, vitamin B2, nicotinic acid, nicotinamide and vitamin B6; the method comprises the following steps: S1, pretreatment: heating a mixture to prepare a liquid sample to be detected; the mixture comprises a sample to be detected, an EDTA saturated solution, formic acid and water; s2, detection: respectively analyzing different standard samples and liquid samples to be detected by adopting a liquid chromatography ultraviolet detector to obtain analysis results of the standard samples and analysis results of the liquid samples to be detected; s3, analysis: comparing the analysis result of the to-be-detected liquid sample with the analysis result of each standard sample, and carrying out qualitative and quantitative analysis on the B vitamins in the to-be-detected sample. According to the method, the use of toxic reagents is reduced, the operation is simple, different B vitamins can be qualitatively and quantitatively detected at the same time, and the detection is rapid, simple, convenient and accurate.

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.

The present invention relates to a fully automatic urine iodine analyzer and a sample analysis method, which are characterized in that a mobile platform is arranged on an aluminum profile frame, an ultraviolet detector and a water-cooled heater are arranged in the three-dimensional moving space of the mobile platform, the mobile platform provides reagents to a digestion tube on the water-cooled heater through an injection needle, and the mobile platform also provides a test sample into the ultraviolet detector through the injection needle, and the ultraviolet detector detects the light intensity values ​​of the sample and a reference solution. The present invention integrates multiple functions of digestion, water bath, and detection, and the entire test process is highly automated, avoiding errors caused by human participation, and greatly improving the convenience and accuracy of the test.

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 present invention discloses a CuCrO2 / GaON heterostructure solar-blind ultraviolet detector and its preparation method. The detector comprises, in sequence, a quartz substrate; a GaON thin film located above the quartz substrate and subjected to in-situ plasma treatment; a CuCrO2 layer located above the GaON film; a first test electrode located above the GaON film; and a second test electrode located above the CuCrO2 layer. The GaON film and the CuCrO2 layer form a CuCrO2 / GaON heterojunction, creating an internal electric field to separate photogenerated carriers. The prepared CuCrO2 / GaON heterostructure solar-blind ultraviolet detector exhibits stable performance, high sensitivity, and fast response speed, and can effectively detect solar-blind ultraviolet light with a wavelength less than 280 nm.