40results about How to "Increase logarithm" patented technology

The invention relates to a bidirectional conjugate tooth profile design method for harmonic gear drive. The bidirectional conjugate tooth profile design method for harmonic gear drive comprises the steps of firstly, expressing a flexible wheel top-section convex tooth profile coordinate through a parameter equation, converting to a rigid wheel coordinate system, solving to obtain discrete point coordinates of a theorical conjugate concave tooth profile and a concave tooth profile of a flexible wheel top-section convex tooth profile, determining the working tooth depth of a rigid wheel tooth profile through least square fit, determining a fitted curve section to be a rigid wheel bottom-section concave tooth profile and a rigid wheel top-section concave tooth profile, and calculating to accomplish a tooth profile design of a rigid wheel; and then expressing a rigid wheel top-section convex tooth profile coordinate through a parameter equation, converting to a flexible wheel coordinate system, solving to obtain discrete point coordinates of a theorical concave conjugate tooth profile in a flexible wheel bottom-section range, determining the tooth depth of a flexible wheel through least square fit, determining a fitted curve to be a flexible wheel bottom-section concave tooth profile, and calculating to obtain a flexible wheel working tooth profile. According to the bidirectional conjugate tooth profile design method for harmonic gear drive provided by the invention, the flexible wheel tooth profile and the rigid wheel tooth profile with bi-conjugate and secondary-conjugate phenomena are directly obtained, so that a conjugate contact area and a meshing zone are increased, the tooth surface contact stress is reduced, and the drive accuracy of a harmonic reducer is improved.

The invention provides a thermal resistance-type thin film thermopile-type transient heat flow meter and a manufacturing method. The heat flow meter comprises a ceramic substrate, and a positive thermocouple, a negative thermocouple, a thermocouple connection layer, an outer thermal resistance layer and an inner thermal resistance layer arranged on the ceramic substrate, wherein the positive thermocouple and the negative thermocouple are in butt joint via the thermocouple connection layer; the outer thermal resistance layer and the inner thermal resistance layer cover the positive thermocouple and the negative thermocouple; when an external environment applies heat flow in a vertical direction to the heat flow meter, the outer thermal resistance layer and the inner thermal resistance layer have different thicknesses, the positive thermocouple and the negative thermocouple are connected to form hot and cold junctions, a temperature difference exists between adjacent two hot and cold junctions, corresponding electric potential output exists according to Seebeck effects, and the output electric potential is related to the heat flow density. Transient measurement on the heat flow density can be realized, and the thermal resistance-type thin film thermopile-type transient heat flow meter has the advantages of simple structure, small size, few influences on a measured field, quick response speed, large measurement temperature range and high measurement precision.

The invention provides a cup-shaped or silk-hat-shaped harmonic gear with three-circular-arc tooth profiles in consideration of the axial taper deformation of a flexible gear body. The cup-shaped or silk-hat-shaped harmonic gear is composed of a rigid gear body, the flexible gear body and a wave generator; the flexible gear body is a straight-tooth cylindrical external gear body with the three-circular-arc tooth profile; and the rigid gear body is a straight-tooth cylindrical inner gear body with the three-circular-arc tooth profile. The invention further provides a design method for the tooth profiles of the cup-shaped or silk-hat-shaped harmonic gear with the three-circular-arc tooth profiles. According to the design method, parameters of the three-circular-arc tooth profile of the flexible gear body are selected according to the design criterion that the envelope existence interval is the largest on a design section; the circular-arc tooth profiles of a tooth root and a tooth top of the rigid gear body adopt outer envelope fitting calculation of the movement tracks of the tooth profile of the flexible gear body on the front cross section and the rear cross section of a gear ring of the flexible gear body; and a middle section adopts circular-arc fitting so as to improve the fitting flexibility of the tooth profiles. Compared with a harmonic gear with double-circular-arc tooth profiles, the harmonic gear with the three-circular-arc tooth profiles has a wider envelope existence interval, a wider conjugate meshing tooth surface and a more uniform backlash, and therefore the bearing capacity and the transmission precision of the harmonic gear can be improved.

The invention discloses a double-layer permanent magnet type axial eddy current recoil and counter-recoil device. The double-layer permanent magnet type axial eddy current recoil and counter-recoil device comprises a supporting mechanism, an eddy current damping mechanism and a counter-recoil mechanism. The eddy current damping mechanism comprises an inner-layer permanent magnet, an outer-layer permanent magnet and an outer-layer magnetic conductive block. Each of the inner-layer permanent magnet and the outer-layer permanent magnet is of an annular cylinder structure. The inner diameter of the outer-layer permanent magnet is larger than the outer diameter of the inner-layer permanent magnet, and the inner-layer permanent magnet and the outer-layer permanent magnet are coaxially arranged. The supporting mechanism provides supporting and moving guidance for the counter-recoil mechanism. A round pipe of the counter-recoil mechanism is located between the inner-layer permanent magnet and the outer-layer permanent magnet and moves relative to the inner-layer permanent magnet and the outer-layer permanent magnet. The device is high in damping coefficient, the suffered impact loads during work of a transmitting device can be buffered, the recoil displacement and the counter-recoil speed of the transmitting device can be effectively reduced, and the counter-recoil function is achieved.

A light emitting diode (LED) chip electrode structure capable of promoting transverse current diffusion and with dual reflection surfaces relates to the technical field of production of an LED chip. The LED chip electrode structure comprises trapezoid structured electrode expansion bars which upwards and sequentially wrap the surface layer of a GaN layer, wherein each trapezoid structured electrode expansion bar comprises a Cr layer, a first Al layer, at least one pair of TiN / Pt layers, an Au layer, a second Al layer and a TiN outer layer. With the electrode structure disclosed by the invention, the transverse current diffusion can be increased, and an effect of multi-surface reflection of light can be achieved.

The invention provides a transient temperature and thermal flux simultaneous measurement sensor and a preparation method thereof. The sensor comprises a ceramic substrate and positive electrode thermocouples, negative electrode thermocouples, thermocouple connecting layers, a thermal resistance layer, a positive electrode thermocouple lead end, a negative electrode thermocouple lead end, a positive electrode thermopile lead end and a negative electrode thermopile lead end which are arranged on the ceramic substrate; the positive electrode thermocouples and the negative electrode thermocouples are connected in a butt-joint mode through the thermocouple connecting layers, one positive electrode thermocouple and one negative electrode thermocouple is connected into a thermocouple pair in series, multiple thermocouple pairs are connected end to end in a lap-joint mode to form the thin-film thermopile, and the thermal resistance layer is arranged over a freezing point of the thermopile in a covering mode; when an external environment applies vertical thermal flow to the sensor, a heating point and the freezing point of the thin-film thermopile has a temperature difference, corresponding potentials are output according to a Seebeck effect, output of the heating point of one thermocouple pair of the sensor is related to the temperature, and the output potential of the thermopile is related to the thermal flux. The sensor can achieve transient measurement on the temperature and the thermal flux and has the advantages of being high in response speed, wide in measurement temperature range, high in measurement precision, capable of achieving simultaneous measurement on the temperature and the thermal flux and the like.

The invention relates to the field of instant food, in particular to an instant two-layer food forming method. The instant two-layer food forming method comprises the following steps: 1) pressing a wrapper and cutting the wrapper into a plurality of slender flour tapes; 2) conveying uncooked or cooked stuffing to the position of the flour tapes; 3) feeding the stuffing to one side of the flour tapes, wherein an angle formed between the stuffing conveying path and the plane of the flour tapes is 45-135 degrees when the stuffing is fed to the flour tapes; 4) firstly pushing the other side of the flour tapes into forming holes of an outer forming template and an inner forming template, wherein the middle portions of the flour tapes wrap the stuffing at the moment to realize preliminary forming; 5) sealing the portions, which wrap the stuffing, of the flour tapes and simultaneously performing pattern printing forming to the flour tapes with sealed portions; 6) placing the formed instant two-layer food on a conveying belt for conveying. By improving the included angle between the stuffing and the flour tapes when the stuffing is filled into the flour tapes, the situation that the stuffing cannot be put in the flour tapes is avoided, the contact surface between the stuffing and the flour tapes is larger, the integrity of the stuffing is better, the stress surface of the flour tapes is larger and the flour tapes are prevented from being damaged.

The present invention relates to a PCR method of multiple primer, its reaction liquid and its application in preparation of microbial detection reagent, specially relates to that in PCR process two denaturation temp. of 92-97 deg.C and 65-87 deg.C are adopted to respectively make initial 2 or 3 circulation or other subsequent circulation so as to overcome the defect of existent multiple PCR which can form non-specific product. Said invention utilizes the proper product design and adoption to two denaturation temperatures so as to obviously reduce the possibility of that non-target product early-synthesized by PCR can participate in subsequence. Said invention is applicable to preparation of single-tubule multiple PCR quick detection reagent, and has extensive application for detecting various viruses.

The invention discloses a flexible power supply watchband formed by multiple thermoelectric modules, and a making method thereof. The flexible power supply watchband is formed through connecting at least one segment of a power supply watchband having a large density, formed by equidistantly arranged thermoelectric modules and arranged in the middle with power supply watchbands arranged at two sides of the middle power supply watchband(s), having the same small density and formed by equidistantly arranged thermoelectric modules; and every power supply watchband formed by the thermoelectric modules sequentially comprises a heat conduction layer, a flexible printed circuit board provided with a thermoelectric module and a plurality of heat dissipating layers from the wrist wearing surface to the outside, every thermoelectric pair in every thermoelectric module on the upper surface of the flexible printed circuit board is arranged in every rectangular through hole of a corresponding watchband main body, every thermoelectric pair is connected with the corresponding heat dissipating layers through a cold end copper conductive sheet, and the heat dissipating layers are positioned outside the corresponding watchband main body. The flexible power supply watchband improves the quantity of the thermoelectric pairs in the thermoelectric module on the premise of guaranteeing the application of the power supply watchband to the contour of the wrist, and improves the output drive capacity of the power supply watchband. The watchband main bodies are made of polydimethylsiloxane, so the flexible power supply watchband has a good flexibility, and is suitable for different arm surfaces.

The invention relates to a traction and straightening mechanism on a reinforcement hoop bending machine. The mechanism comprises a traction wheel set and a traction length counting wheel set; a set of longitudinal traction and straightening mechanisms is at least arranged between the traction wheel set and the traction length counting wheel set; each set of longitudinal traction and straightening mechanisms at least includes two driving wheels and one driven wheel; the driven wheel is staggered from the driving wheels; the driving wheels are mounted on a traction and straightening box through driving shafts; transmission wheels are mounted on the driving shafts in the traction and straightening box; transmission components are assembled on the transmission wheels, and are connected with driving devices; the driven wheel is mounted on the traction and straightening box through a driven shaft; and straightened reinforcements are matched and pressed between the driven wheel and the driving wheels. The mechanism is convenient to penetrate and tow the reinforcements through arrangement of pressing wheels, and effectively tows the reinforcements during straightening the reinforcements through arrangement of staggered wheels to prevent slippage, so that the surface quality of the reinforcements is improved, and the efficiency is improved; and in addition, the mechanism has such advantages as simple structure, convenience for installation, stable work, low noise and energy consumption saving.

The invention relates to an organic electroluminescent device and a preparation method thereof, wherein the organic electroluminescent device has a layered structure and comprises an anode conductive substrate, a first hole injection layer, a first electron injection layer, a second hole injection layer, a hole transport layer, a green light emitting layer, an electron transmission layer, a second electron injection layer and a cathode layer; wherein the anode conductive substrate, the first hole injection layer, the first electron injection layer, the second hole injection layer, the hole transport layer, the green light emitting layer, the electron transmission layer, the second electron injection layer and the cathode layer are successively laminated. The first hole injection layer and the second hole injection layer are made of hole injection material and p-type material which is doped into the hole injection material. The first electron injection layer and the second electron injection layer are made of electron injection material and n-type material which is doped into the electron injection material. According to the organic electroluminescent device, through the added second hole injection layer and the second electron injection layer, working voltage can be reduced and luminous efficiency can be improved effectively.

The invention discloses a three-shaft clutch speed change device, which includes a speed change gear set, three clutch devices, at least one and at most three clutches, the speed change gear set includes a first input shaft, a second input shaft and a third input shaft, the first The second input shaft and the third input shaft are hollow shafts, the first input shaft is passed through the second input shaft which is a hollow shaft, the second input shaft is passed through the third input shaft which is a hollow shaft, and the three clutch devices They are respectively connected between the power output shaft and the first input shaft, the second input shaft and the third input shaft; the three clutches are respectively connected to any two of the power input part, power output part and transmission control part of the three clutch devices. Between them, it is used for selective engagement, so that the power drives the input shaft of the variable speed gear set at a constant speed. The invention can meet the multi-gear requirements of the vehicle on the limited structural size.

The invention discloses a trapezoidal comb tooth; the width of the root of the trapezoidal comb tooth is larger than that of the head of the trapezoidal comb tooth, and the width of the trapezoidal comb tooth is monotonously reduced from the root of the trapezoidal comb tooth to the head of the trapezoidal comb tooth. Due to the trapezoidal comb tooth design, the width of the comb tooth root is larger than that of the comb tooth head, and the rigidity of the comb tooth root can be greatly improved under the condition that the average width of the comb teeth is kept unchanged; under the condition of a fixed chip size, compared with a rectangular comb tooth structure in the prior art, the trapezoidal comb tooth structure has the advantages that the driving torque of a comb tooth driver can be greatly improved, the driving angle is increased, or the size of the chip is reduced, the driving voltage is reduced, the technical performance of the chip is greatly improved, and the cost of the chip is reduced.

The invention relates to an organic electroluminescent device and a preparation method thereof, wherein the organic electroluminescent device has a layered structure and comprises an anode conductive substrate, a first hole injection layer, a hole transport layer, a blue light emitting layer, an electronic transmission layer, a first electron injection layer, a second hole injection layer, a second electron injection layer and a cathode layer; wherein the anode conductive substrate, the first hole injection layer, the hole transport layer, the blue light emitting layer, the electronic transmission layer, the first electron injection layer, the second hole injection layer, the second electron injection layer and the cathode layer are successively laminated. The first hole injection layer and the second hole injection layer are made of hole injection material and p-type material which is doped into the hole injection material. The first electron injection layer and the second electron injection layer are made of electron injection material and n-type material which is doped into the electron injection material. According to the organic electroluminescent device, through the added second hole injection layer and the second electron injection layer, working voltage can be reduced and luminous efficiency can be improved effectively.

The invention provides an epitaxial structure and an epitaxial growth method thereof, and an LED chip, the epitaxial structure comprises a substrate, an N-type covering layer epitaxially grown on the substrate, and a multi-quantum well layer epitaxially grown on the N-type covering layer, and the multi-quantum well layer comprises a plurality of pairs of quantum well layers and quantum barrier layers which alternately grow; wherein the Si doping concentration of the N-type covering layer is greater than 3e17, and the logarithm of the quantum well layer and the quantum barrier layer is increased along with the increase of the Si doping concentration of the N-type covering layer. Besides, by increasing the Si doping concentration of the N-type covering layer, the carrier concentration of the N layer is improved, so that under the same condition, the carrier migration probability is increased, and the recombination efficiency of the epitaxial PN junction is improved. Besides, along with the increase of the doping concentration of the N-type covering layer, the number of pairs of barriers and wells of the multi-quantum well layer is increased synchronously, the limit of carrier overflow is improved, the light intensity saturation value is increased, and therefore the brightness of the chip can be higher under the same manufacturing process.

The invention provides a TE-cooler MOSFET (Metal Oxide Semiconductor Field Effect Transistor) structure as well as a preparation method and an adjustment method thereof. The TE-cooler MOSFET structurecomprises an N-type substrate, a TE-cooler P / N structure, a P well, a gate oxide layer, a field oxide layer, an interlayer dielectric, a metal layer, a first passivation layer, a drain layer and a second passivation layer. According to the TE-cooler MOSFET structure provided by the invention, the TE-cooler structure is arranged on the MOSFET structure, so that the heat conduction and heat dissipation effects of the MOSFET are greatly enhanced; in addition, the refrigerating capacity of the TE-cooler structure can be adjusted by increasing the logarithm of a TE-cooler device or reducing resistance or adjusting current, and the TE-cooler structure is more convenient to use.

The invention provides a thermal resistance-type thin film thermopile-type transient heat flow meter and a manufacturing method. The heat flow meter comprises a ceramic substrate, and a positive thermocouple, a negative thermocouple, a thermocouple connection layer, an outer thermal resistance layer and an inner thermal resistance layer arranged on the ceramic substrate, wherein the positive thermocouple and the negative thermocouple are in butt joint via the thermocouple connection layer; the outer thermal resistance layer and the inner thermal resistance layer cover the positive thermocouple and the negative thermocouple; when an external environment applies heat flow in a vertical direction to the heat flow meter, the outer thermal resistance layer and the inner thermal resistance layer have different thicknesses, the positive thermocouple and the negative thermocouple are connected to form hot and cold junctions, a temperature difference exists between adjacent two hot and cold junctions, corresponding electric potential output exists according to Seebeck effects, and the output electric potential is related to the heat flow density. Transient measurement on the heat flow density can be realized, and the thermal resistance-type thin film thermopile-type transient heat flow meter has the advantages of simple structure, small size, few influences on a measured field, quick response speed, large measurement temperature range and high measurement precision.

The invention discloses a conformal preparation method for a thick-film heat flow meter, which belongs to the field of thick-film sensors, comprising: S1 prepares a groove at a part of a substrate to be measured, the groove is used to provide a place for preparing a thermal resistance layer, and S2 prepares a groove in the groove The thermal resistance layer is prepared in S3, the insulating layer is prepared in S3, the thermoelectric positive electrode, thermoelectric negative electrode and thermal junction are prepared on the insulating layer in S4 to form a thermopile pattern, and the surface protection layer is prepared in S5, which is used to improve the stability of the heat flow meter. In the present invention, laser micro cladding technology is used to conveniently and efficiently direct write and micro cladding of electronic paste, so as to prepare heat flow meters on the surface of various substrates, which has the advantages of simple process, no need for masks, short manufacturing cycle and low cost The advantages.

A continuous ionic adsorption and exchange device system comprises resin tanks and a porous distributing valve, wherein the porous distributing valve comprises a fixed valve array and a movable valve array. Each movable valve and each fixed valve are respectively provided with an upper port and a lower port, an inlet of each resin tank is communicated with the upper port of one fixed valve, and an outlet of each resin tank is communicated with the upper port of another fixed valve, the upper ports of the movable valves are in one-to-one butting design with the lower ports of the fixed valves in the working process, and the lower ports of the movable valves are communicated with each other or communicated with the outside. The continuous ionic adsorption and exchange device system is compact in device, simplified in system, reduced in pipeline and small in occupation area, overcomes the shortcomings of bias current phenomena easily occurring in the adsorption process, vacancy and wasteof partial resin, low using efficiency of resin, large using amount and serve waste of chemical agents in the desorption and regenerative process, large discharging amount of effluent, long operationperiod, large quantity of connection pipelines and valves, fussy operation and the like.

The invention relates to a swing pin chain which bears large torque and impact load, a continuously variable speed change device equipped with the swing pin chain, and a power machine equipped with the continuously variable speed change device. Through the specific setting of the mutual proportional relationship and shape of the chain links, chain plates, swing pins and other components of the swing pin chain, and at the same time through the specific setting of the matching parts of the swing pin chain and the continuously variable transmission device, the continuously variable transmission is improved. The variable speed performance increases the load capacity of the continuously variable transmission, making it more suitable for high-horsepower machinery, and achieves technical effects such as impact resistance and fatigue life improvement.

A light emitting diode (LED) chip electrode structure capable of promoting transverse current diffusion and with dual reflection surfaces relates to the technical field of production of an LED chip. The LED chip electrode structure comprises trapezoid structured electrode expansion bars which upwards and sequentially wrap the surface layer of a GaN layer, wherein each trapezoid structured electrode expansion bar comprises a Cr layer, a first Al layer, at least one pair of TiN / Pt layers, an Au layer, a second Al layer and a TiN outer layer. With the electrode structure disclosed by the invention, the transverse current diffusion can be increased, and an effect of multi-surface reflection of light can be achieved.

The invention discloses a filtering unit applied to color imaging, which is characterized in that a dye film layer is arranged on the upper surface of a multilayer film interference filtering structure, and the dye film layer doubly absorbs incident and reflected non-transmission light rays. In addition, the invention further discloses a wide-spectrum color filter chip integrated with the filter unit and a preparation method of the wide-spectrum color filter chip, the filter chip solves the contradiction between high transmittance and low cut-off transmittance of a traditional dye filter film, and application of a multilayer film interference filter structure to the field of color imaging and display becomes reality.

The invention discloses a high-speed photodetector structure. The epitaxial wafer includes an InP substrate, and a lower ohmic contact layer, a lower window layer, an absorption layer, an upper window layer, and an upper ohmic contact layer grown sequentially on the InP substrate from bottom to top. A contact layer, the epitaxial wafer is arranged as a mesa structure, one side of the mesa structure is a light incident surface, the incident surface is provided with an anti-reflection film, and the other side away from the anti-reflection film is a light reflection surface, A high reflection film is provided on the light reflection surface. The light incidence direction of the photodetector of the present invention is perpendicular to the direction of the drift electric field, the absorption layer is 0.1-3um, the carrier drift is fast, and the bandwidth is high; the present invention further reduces the device size and improves the device bandwidth while improving the internal quantum efficiency. , to balance the uniform distribution of the photocurrent in the entire absorbing layer, and avoid the signal nonlinear distortion problem caused by the uneven light absorption of the absorbing layer and local photocurrent saturation.

The invention relates to a high-fuel-efficiency internal combustion engine comprising an air cylinder, a piston and a push rod, wherein the piston is positioned into the air cylinder, the push rod is used for driving the piston to move in a reciprocating way. The internal combustion engine is characterized by also comprising a cam and a central shaft, pairs of peak-valley grooves are formed on the cam, the central shaft passes through the center of the cam and is connected with the cam, the cam and the push rod are mutually driven through the peak-valley grooves, and a torque is output by thecentral shaft. The cam is used for replacing a crank to reduce lost fuel efficiency generated by operating the crank, and one air cylinder can generate a plurality of explosion strokes when the cam is rotated once.

A porous distributing valve for continuous adsorption exchange equipment comprises a turning disc, a fixed disc, fixed valves and movable valves, wherein the turning disc is coaxially and rotationally arranged relative to the fixed disc; the fixed valves are fixed on the turning disc; the movable valves are arranged on the fixed discs in a sliding manner; the number of the fixed valves and the number of the movable valves are the same, and the fixed valves and the movable valves are arranged in pairs; the fixed valves are matched with the movable valves paired with the fixed valves in arrayment and mounting angle; and movable water passing plugs, which are matched with one another and used for self-sealing, are arranged at one ends, which are in abutting joint with the movable valves, of the fixed valves. The porous distributing valve has a simple structure and low cost, and the cost is only one third of that of equipment from abroad; since runners on columns are independently sealed,the defect that a large-diameter planar sealing pad is easy to wear is overcome; columns have more combination forms, and can be used for treating several different leaching liquors simultaneously; the transmission and the control are simple, and the energy consumption is low; and the maintenance and the repair are simple, and the operation cost is low.

The invention relates to a bidirectional conjugate tooth profile design method for harmonic gear drive. The bidirectional conjugate tooth profile design method for harmonic gear drive comprises the steps of firstly, expressing a flexible wheel top-section convex tooth profile coordinate through a parameter equation, converting to a rigid wheel coordinate system, solving to obtain discrete point coordinates of a theorical conjugate concave tooth profile and a concave tooth profile of a flexible wheel top-section convex tooth profile, determining the working tooth depth of a rigid wheel tooth profile through least square fit, determining a fitted curve section to be a rigid wheel bottom-section concave tooth profile and a rigid wheel top-section concave tooth profile, and calculating to accomplish a tooth profile design of a rigid wheel; and then expressing a rigid wheel top-section convex tooth profile coordinate through a parameter equation, converting to a flexible wheel coordinate system, solving to obtain discrete point coordinates of a theorical concave conjugate tooth profile in a flexible wheel bottom-section range, determining the tooth depth of a flexible wheel through least square fit, determining a fitted curve to be a flexible wheel bottom-section concave tooth profile, and calculating to obtain a flexible wheel working tooth profile. According to the bidirectional conjugate tooth profile design method for harmonic gear drive provided by the invention, the flexible wheel tooth profile and the rigid wheel tooth profile with bi-conjugate and secondary-conjugate phenomena are directly obtained, so that a conjugate contact area and a meshing zone are increased, the tooth surface contact stress is reduced, and the drive accuracy of a harmonic reducer is improved.

The invention discloses a high-speed photoelectric detector structure. An epitaxial wafer of the high-speed photoelectric detector structure comprises an InP substrate, a lower ohmic contact layer, a lower window layer, an absorption layer, an upper window layer and an upper ohmic contact layer, the lower ohmic contact layer, the lower window layer, the absorption layer, the upper window layer and the upper ohmic contact layer sequentially grow on the InP substrate from bottom to top, the epitaxial wafer is a mesa structure, and one side surface of the mesa structure is a light incident surface. The incident surface is provided with an antireflection film, the other side surface far away from the antireflection film is a light reflection surface, and the light reflection surface is provided with a high reflection film. A light incident direction of a photodetector is perpendicular to the direction of a drift electric field, the absorption layer is 0.1-3 mu m, the drift of carriers is fast, and a bandwidth is high. While the internal quantum efficiency is improved, the size of the device is further reduced, the bandwidth of the device is improved, the uniform distribution of a photocurrent of the whole absorption layer is balanced, and the problem of nonlinear distortion of signals caused by uneven light absorption of the absorption layer and local photocurrent saturation is avoided.

Disclosed are antiseptic compositions for disinfecting tissues, in particular for ocular use. Methods and compositions disclosed herein include sodium chlorite, optionally in combination with a surfactant.