34results about How to "Short pulse time" patented technology

The invention relates to a method for testing mechanical property of a material under the action of stress wave, in particular to a method and a device for measuring dynamic fracture property of a laser shock loading material. The method comprises the following steps of: loading a three-point bent sample (4) with preformed crackles (1) by using shock wave induced by nanosecond-scale laser pulse (8), and detecting the propagation property of the stress wave (17) in the three-point bent sample (4) and the expansion property of the crackles by adopting a method of combining photo-elasticity and moire. The device acquires a high-speed transient photo-elastic image of interaction of the material and the stress wave under the condition of a high loading rate by using a multi-spark camera optical system (13), can clearly observe the propagation of the laser-induced short pulse stress wave (17), and can accurately and reliably acquire the fracture property of the material by processing.

The invention relates to a vacuum diode with high current, small focal spot and long service life. The original diode in a repetition frequency fast-pulse hard X-ray generator is modified, the structure and the material of movable cathode and anode assemblies are improved, a cathode head is made of tungsten nickel copper alloy materials and is seated on a movable support, a conical hole structure inwards forming a sharp end bulge is used for emitting electrons and is aligned with X rays, and an anode target is made of metal tantalum materials and is fixedly arranged on a copper core wire through screw threads. The conical annular cathode structure is improved, the radius of sent plasmas is favorably controlled, dense plasmas can be conveniently obtained, the self pinching condition in the electronic beam transporting process is met, submillimeter beam spots are formed, and the detailed imaging requirement of the pulse imaging field is met.

The invention belongs to the technical field of displacement compressor, and relates to a radial multi-cylinder synchronization rotary compressor. The radial multi-cylinder synchronization rotary compressor comprises a crank shaft driven by a motor, a cylinder and a cylinder cover of a cylinder body, a bearing supporting the crank shaft, a stander and a piston making reciprocating movement in the cylinder body, and is characterized in that at least one set of bidirectional piston and a cylinder corresponding to the bidirectional piston are arranged on the crankshaft driven by the motor and on the same plane vertical to the crankshaft, wherein the bidirectional pistons are distributed circumferentially and are provided with a rotating center respectively. The crank shaft, the cylinder body and the pistons can rotate synchronously along the rotating centers respectively. An intake, an exhaust port, an intake and an exhaust valve are arranged on the cylinder cover or the piston bodies. The radial multi-cylinder synchronization rotary compressor has the advantages of small size, good heat radiating effect, low noise, good air-tightness, high working efficiency and therefore is suitable for spreading application on the same type of compressor.

The invention discloses a high-brightness pulse white-light source exciting system. A focusing lens assembly and an air chamber are sequentially arranged on a light path of laser pulses output by a nanosecond-pulse laser. The laser pulses are focused into the air chamber through the focusing lens assembly, light emitted by generated plasma flame is collected by an optical collecting device, and a high-brightness pulse white-light source is obtained. The collected white light of the high-brightness pulse white-light source exciting system can be used for spectral analysis, imaging, illumination, photoetching, transfer printing and other fields. The high-brightness pulse white-light source exciting system achieves white light output which is short in pulse time, high in instantaneous strength, stable in time and spectral property, and wide in spectral region.

The invention discloses a tungsten probe composite diamond-like coating layer; the coating layer is composed of a tungsten probe matrix, a bottom adhesive layer and a surface layer in sequence, the bottom adhesive layer is metal titanium, and the surface layer is a diamond-like coating layer. The preparation method adopts a negative electrode filter electric arc technology, an ion beam technologyand a vacuum sputtering technology are combined, the composite diamond-like coating layer is deposited on a sample substrate, and the obtained composite diamond-like coating layer has the advantages of high film-substrate bonding strength, low internal stress, low friction coefficient, good uniformity and long wear resistance.

The invention discloses a method for breeding an high-yield ascomycin strain by performing femtosecond laser mutagenesis on streptomyces hygroscopicus ascomycota subspecies and a culture medium preparation method; the method comprises the following steps: at room temperature, mixing mature slant spores of the streptomyces hygroscopicus ascomycota subspecies (ATCC14891) and sterile water to obtain monospore suspension containing 106-107 spores per milliliter; irradiating the spore suspension for 1-10 min by using the titanium sapphire femtosecond laser with centre wavelength of 800 nm, pulse width of 150 fs and frequency of 76 MHz under a irradiation power of 10-30m W; properly diluting the spore suspension, coating on a solid panel to culture, then screening by using a shake flask to obtain a high-yield ascomycin mutation strain. The method provided by the invention has the advantages that the used femtosecond laser mutagenesis method is feasible and safe to operate; the mutation effect is better than that of the traditional physical and chemical mutagenesis method, and the femtosecond laser mutagenesis method has great popularization value in breeding of microorganism pharmaceutical strains; by using the femtosecond laser irradiation to perform the mutagenesis, the high-yield ascomycin mutation strain can be bred. The positive mutation rate of the mutation strain is 5-30%, and fermenting unit is improved by 10-60% in comparison with that of an original strain.

The invention provides a fault current suppression method and system for a double-electrical-port variable-flux motor and a medium, and the double-electrical-port variable-flux memory motor comprises a stator core and a three-phase AC armature winding disposed on the stator core. The three-phase alternating-current armature winding comprises a first armature winding, a second armature winding, a rotor iron core and a demagnetized permanent magnet placed on the rotor iron core, and the two sets of armature windings of the motor are independently controlled; and the electric machine is driven by a controller comprising three-phase inverters including a first inverter and a second inverter, the first inverter being electrically connected to the first armature winding and the second inverter being electrically connected to the second armature winding. Under the condition that a motor system breaks down, the residual healthy alternating-current armature winding and the inverter are reasonably controlled, the fault back electromotive force is reduced, and the fault current is restrained; and the method is suitable for occasions with high fault tolerance requirements, and application objects include but are not limited to high-reliability vehicle driving motors, high-power marine driving motors and high-capacity wind driven generators.

The invention discloses a method for preparing an aluminum-based amorphous layer by jointly adopting hot spraying and electron beam remelting technologies, and relates to the technical field of preparation of an aluminum-based amorphous coating. The method comprises the steps of preparing an Al-Co-Ce alloy, carrying out a gas atomization process on the alloy so as to powder, then utilizing a supersonic speed flame for hot-spraying a substrate surface so as to prepare an Al-Co-Ce alloy protection coating, and finally adopting a high-current pulse electron-beam for carrying out surface modification on the prepared Al-Co-Ce alloy protection coating, wherein the Al-Co-Ce alloy is prepared from 4.0 to 8.0 at percent of Co, 6.0 to 8.0 at percent of Ce and the balance Al. According to the methodfor preparing the aluminum-based amorphous layer by jointly adopting the hot spraying and electron beam remelting technologies provided by the invention, surface modification is carried out on the surface of a hot-spraying coating, so that the amorphous alloy layer with a flat surface and a compact structure is generated, and the corrosion resistance of the hot-spraying coating is improved.

The invention provides an engine air cylinder sleeve-piston ring laser shot blasting method which comprises the following steps: S1, dipping degreasing cotton in absolute ethyl alcohol to wipe the surface of an air cylinder sleeve-piston ring so as to remove oil dirt on the surface of a part; S2, pasting an aluminium foil adhesive tape as an absorption layer on the to-be shot blasted surface of the air cylinder sleeve-piston ring; S3, controlling the water flow, and arranging a restraint layer by spraying deionized water on the absorption layer; and S4, clamping and fixing the air cylinder sleeve-piston ring on the clamp of an operating platform, and adjusting the laser path to start laser shot blasting so as to finish laser shot blasting modeling of the part. According to the engine air cylinder sleeve-piston ring laser shot blasting method, tiny concave pits on a surface subject to shot blasting has an oil storage function to realize an excellent lubricating function and reduce friction loss.

The invention relates to a mass spectrometer and an optical system thereof. The optical system adopts a mass spectrum ion source design based on a solid laser, has the advantages of long service life,short pulse time, small size, high repetition frequency and the like compared with an N2 laser, and is beneficial to improving the resolution of a mass spectrometer and reducing the maintenance frequency. Particularly, according to the optical system, a solid laser, a whole optical path system and a shell are completely fixed to an optical fixing platform, the optical path system is located in the shell, the structure is very stable, and installation and maintenance are convenient. During use, the size of a laser spot can be adjusted by adjusting the distance between a first focusing lens anda collimating lens, so that the invention is convenient to use.

The present invention relates to a point electrowelding welding head for the electronic industry and microelectronic industry. It comprises two parallel electrodes which are made of high-temp. resistant metal material, and combined together and an insulating layer sandwiched between two electrodes, and is characterized by that the said insulating layer is made up by adopting insulating viscose capable of producing fix-connecting adhesion and insulating separation actions simultaneously so as to save insulating rivet, and at the same time, the pointed portions of two parallel electrodes are made into the form of mutual ohmic contact so that it not only can directly weld enamelled wire, but also can obtain good welding effect for welding bare wire, metal sheet and metal tape, etc.

The invention provides a preparation method of a metal interconnection structure. The method comprises that a lower dielectric layer with an interconnection line is provided; an etching terminal detection layer rich in nitrogen, a porous interlayer dielectric layer, a low K buffer layer and a metal hard mask layer are formed on the lower dielectric layer successively; a photoresist layer with an open-mounted pattern is formed on the metal hard mask layer, and the cross sectional width of an opening is greater than that of the interconnection line; the metal hard mask layer and the low K bufferlayer are etched to form an opening structure; femto second laser etching is carried out on the porous interlayer dielectric layer by taking the opening structure as a mask; during detection, when the etching terminal detection layer rich in nitrogen is reached by etching, third etching is carried out, and a nitrogen reduction gas is input in the etching process; after that the interconnection line in the lower portion is exposed, nitrogen is input continuously to over etching the lower dielectric layer further and form an opening structure; and a barrier layer, a crystal seed layer and a metal layer are formed successively in the opening structure, and the metal interconnection structure is formed.

The invention relates to a pulse fiber laser using a saturable absorber as an intensity modulation device, in particular to the field of lasers. In this application, the wavelength division multiplexer is optically connected to the pump source, one end of the erbium-doped optical fiber and the output coupler respectively, and the other end of the erbium-doped optical fiber, the isolator, the polarization controller and the optical modulator are optically connected in turn, and the optical modulator The other end is optically connected to the other end of the output coupler, wherein the material of the saturable absorber of the light intensity modulator is iron selenide phosphite, because iron selenide phosphite is stacked by multiple thin layers, and has Relatively high electron mobility, which makes the optical modulator made of iron selenide phosphite have excellent light intensity modulation ability, and because the iron selenide phosphite has a large modulation depth, the pulsed fiber laser The pulse time is shorter, and the light modulator made of iron selenide phosphite is lower cost.

The invention provides a method for laser processing chips, comprising: building a laser processing system with lasers and optical elements; obtaining the position information of the cooling type infrared detection chip placed on the workbench; setting the processing parameters of the laser processing system according to the position information, and using the laser The processing system generates a laser processing beam according to the processing parameters; changing the relative position of the laser processing beam and the cooled infrared detection chip, so that a closed annular groove is formed between the pixel layer and the edge on the cooled infrared detection chip. The invention can evenly reduce the pulling of the overflowing filling glue around the pixel layer on the cooling type infrared detection chip when the temperature cycle passes, and then can efficiently and uniformly eliminate the thermal stress on the photosensitive layer and epoxy resin of the cooling type infrared detection chip Position offset effects between layers.

The invention discloses a method for preparing a composite worm or bearing bush, which comprises the following steps of: a, casting ductile iron or low-carbon steel to form a worm matrix, processing the tooth form of the matrix until the size is slightly smaller than the required size, and keeping out a welding layer margin; b, performing fusion welding of a copper alloy welding wire on the matrix surface to manufacture a worm blank of which the matrix surface is covered with a uniform and compact welding layer by adopting a sub laser pulse welding, pulse argon arc welding or laser pulse cluster fusion welding mode; c, performing high tempering or vibration aging treatment to eliminate internal stress; and d, milling the worm blank to meet the requirement of design size by using a formingtool. The advantages of two materials are integrated, so the bearing capacity of the product is enhanced, valuable materials are greatly saved, and indexes of mechanical properties greatly exceed those of a product prepared in a casting mode.

The invention belongs to the technical field of atomic layer deposition, and discloses an atomic layer deposition device and a deposition method suitable for powder samples. The atomic layer deposition device is provided with: a two-stage heatable main cavity; a two-stage heatable main cavity The outside of the chamber is connected with a mechanical rotating shaft and a vibrator driven by a motor or other means, and a flexible heatable gas pipeline is fixed at both ends of each stage of the two-stage heatable main chamber; The pipeline is externally connected with a pneumatic valve and a powder filter; the powder filter is connected with a heatable gas pipeline. The hourglass type atomic layer deposition equipment disclosed by the invention is suitable for experimental research and industrial-grade powder sample preparation. From the perspective of technology and equipment, it breaks through the efficiency and cost limitations of atomic layer deposition technology, and can realize a single milligram to ton level lithium battery. , Fuel cells, catalysts and other powder uniform coating.

Embodiments of the invention disclose a remote control key response method and device, equipment and a storage medium. The method comprises the following steps of receiving a remote control key command; analyzing a key code pulse carried by the remote control key command; if the pulse reading time of a current logic bit is not larger than the set time, judging as logic 0; if the pulse reading timeof the current logic bit is larger than the set time, judging as logic 1, wherein the set time is smaller than the pulse reading time of the logic 1 defined by a standard protocol; and obtaining a corresponding key code value according to the key code pulse, and responding to the remote control key instruction based on the key code value. When the electronic equipment analyzes the key code pulsecarried by the remote control key command, the pulse time of the logic 1 defined by the standard protocol is shortened, and the logic 1 is rapidly read and judged, so that the response speed and the operation smoothness of the electronic equipment on the remote control key command are greatly improved, especially when a user continuously presses a key, more response time can be saved, and the userexperience can be improved.

The invention relates to a closed runner reaction tank system with a flow guide plate. The closed runner reaction tank system comprises a reaction tank main body, an upper sealing cover, a lower sealing cover and at least one flow guide plate, wherein a plurality of closed runners are arranged in the reaction tank main body; the upper sealing cover and the lower sealing cover are respectively arranged at the two ends of the reaction tank main body; an inlet end and an outlet end are respectively formed on the upper sealing cover and the lower sealing cover so as to connect the closed runners; the flow guide plate is arranged between the upper sealing cover and the reaction tank main body and is used for uniformly guiding the precursor injected from the inlet end of the upper sealing cover into the closed runners.

The invention relates to a pulse fiber laser taking a saturable absorber as an intensity modulation device, in particular to the field of lasers. According to the invention, a wavelength division multiplexer is optically connected with a pumping source, an erbium-doped fiber and one end of an output coupler; the other end of the erbium-doped optical fiber, the isolator, the polarization controllerand the optical modulator are optically connected in sequence; the other end of the optical modulator is optically connected with the other end of the output coupler, wherein the saturable absorber of the light intensity modulator is made of iron selenophosphite; and the iron selenophosphite is formed by stacking a plurality of thin layers. Compared with the prior art, the optical modulator prepared from the iron selenophosphate has the advantages that the optical modulator prepared from the iron selenophosphate has excellent light intensity modulation capacity, the pulse time of the pulse optical fiber laser is shorter due to the fact that the iron selenophosphate has a large modulation depth, and the cost of the optical modulator prepared from the iron selenophosphate is lower.

The invention relates to a method for testing mechanical property of a material under the action of stress wave, in particular to a method and a device for measuring dynamic fracture property of a laser shock loading material. The method comprises the following steps of: loading a three-point bent sample (4) with preformed crackles (1) by using shock wave induced by nanosecond-scale laser pulse (8), and detecting the propagation property of the stress wave (17) in the three-point bent sample (4) and the expansion property of the crackles by adopting a method of combining photo-elasticity and moire. The device acquires a high-speed transient photo-elastic image of interaction of the material and the stress wave under the condition of a high loading rate by using a multi-spark camera optical system (13), can clearly observe the propagation of the laser-induced short pulse stress wave (17), and can accurately and reliably acquire the fracture property of the material by processing.

The invention provides a preparation method of a metal interconnection structure. The method comprises that a lower dielectric layer with an interconnection line is provided; an etching terminal detection layer rich in nitrogen, a porous interlayer dielectric layer, a low K buffer layer and a metal hard mask layer are formed on the lower dielectric layer successively; a photoresist layer with an open-mounted pattern is formed on the metal hard mask layer, and the cross sectional width of an opening is greater than that of the interconnection line; the metal hard mask layer and the low K bufferlayer are etched to form an opening structure; femto second laser etching is carried out on the porous interlayer dielectric layer by taking the opening structure as a mask; during detection, when the etching terminal detection layer rich in nitrogen is reached by etching, third etching is carried out, and a nitrogen reduction gas is input in the etching process; after that the interconnection line in the lower portion is exposed, nitrogen is input continuously to over etching the lower dielectric layer further and form an opening structure; and a barrier layer, a crystal seed layer and a metal layer are formed successively in the opening structure, and the metal interconnection structure is formed.

The invention relates to a vacuum diode with high current, small focal spot and long service life. The original diode in a repetition frequency fast-pulse hard X-ray generator is modified, the structure and the material of movable cathode and anode assemblies are improved, a cathode head is made of tungsten nickel copper alloy materials and is seated on a movable support, a conical hole structure inwards forming a sharp end bulge is used for emitting electrons and is aligned with X rays, and an anode target is made of metal tantalum materials and is fixedly arranged on a copper core wire through screw threads. The conical annular cathode structure is improved, the radius of sent plasmas is favorably controlled, dense plasmas can be conveniently obtained, the self pinching condition in the electronic beam transporting process is met, submillimeter beam spots are formed, and the detailed imaging requirement of the pulse imaging field is met.

A laser diode device 1 includes a thermally conductive substrate 2 that has a planar surface for dissipating ambient heat, and a plurality of laser diodes 3 situated thereon, each of which includes atleast one epitaxial layer 4 that is situated on a side of the laser diode 3 facing the substrate 2. The laser diodes 2 are each electrically activated via an electrically conductive coating situatedbetween the at least one epitaxial layer 4 and the substrate 2. The substrate 2 includes a plurality of metallized cavities that accommodate the plurality of laser diodes 3 so that the plurality of laser diodes have an essentially uniform height above the substrate.

The invention provides a method of preparing a semiconductor structure having a porous dielectric layer. The method comprises: a lower dielectric layer having interconnect lines is provided; a nitrogen-rich etch stop detection layer, a porous inter-layer dielectric layer, a low-k buffer layer, a metal hard mask layer, and a photoresist layer with an opening pattern are formed on the lower dielectric layer successively; first etching is carried out on the metal hard mask layer and the low-k buffer layer below by using the opening pattern of the photoresist as a mask; the rest of photoresist isremoved; second etching is carried out on the porous inter-layer dielectric layer below by using the opening as a mask, wherein the second etching employs femtosecond laser etching and the edge of theexposed hole structure is melted partially to seal the exposed hole structure when the porous inter-layer dielectric layer is etched by using femtosecond laser; third etching is carried out and hydrogen gas is introduced during the etching; and after exposure of the lower interconnect lines, hydrogen gas is continuously led to obtain an open structure in the porous inter-layer dielectric layer.

The invention provides a CO2 cascade ultraviolet Raman laser. High-purity CO2 gas is pumped by adopting quadruplicated frequency 266nm of an Nd: YAG laser, and three main ultraviolet light outputs of276nm, 287nm and 299nm are realized by utilizing cascade stimulated Raman scattering. By using double Raman pools, the energy output of Raman light of each order in the two Raman pools can be respectively regulated and controlled. Raman light output of different energy can be obtained by changing energy, pulse width, light beam quality and polarization state of incident pump light, pressure of CO2gas in the two Raman pools, focusing parameters and lengths of the Raman pools or filling buffer gas in the Raman pools and controlling types and pressure of the buffer gas. The laser has the advantages that the laser is simple in design and convenient to debug, simultaneous output of two atmospheric window pairs (276 nm / 287 nm and 287 nm / 299 nm) can be achieved, and the energy output values of the three beams of light can be regulated and controlled.

The invention discloses a robot for quickly impacting and smashing burnt objects, which belongs to the field of smashing robots. It includes a frame, a motor and a bearing frame fixedly installed on the frame; a ratchet is fixedly installed on the output shaft of the motor, and the contour line of the ratchet of the ratchet is composed of a circular arc line and a radial line; the bearing frame The upper body is equipped with a first linear bearing and a second linear bearing, an active impact rod is slidingly installed in the first linear bearing, and a passive impact rod is slidingly installed in the second linear bearing; the active impact rod is located on the first straight line An impact spring and a spring baffle are installed sequentially below the bearing. The two ends of the impact spring are free and contact with the bearing frame and the spring baffle respectively; The invention is a robot with a simple and reasonable structure, which forms an impact force based on a sudden change in displacement, and whose impact size can be adjusted to quickly impact and smash burnt objects.

The invention relates to an all-optical ultrasonic detection device based on photoinduced ultrasound and laser interference. The first laser of the device is connected to the optical switch through an optical fiber; the optical switch is connected to the dielectric film through multiple optical fibers, and the light-absorbing film is located on the outgoing light path of the dielectric film; the second laser generates reference light and multiple probe lights; the reference light passes through the acoustic After the optical frequency shifter and the second optical fiber coupler, the first frequency-shifted reference light and multiple beams of second frequency-shifted reference light are generated; the first frequency-shifted reference light passes through the third optical fiber coupler and reaches the first photodiode to generate a carrier signal; After the light is reflected by the dielectric film, it interferes with the second frequency-shifted reference light, and the interfering light reaches the second photodiode after passing through the fourth optical fiber coupler to generate a frequency modulation signal, and the frequency modulation signal and carrier signal are input to the mixer to generate a frequency mixing signal; The collection unit is used to collect the mixed frequency signals output by multiple mixers, and obtain the vibration signal generated by the object to be measured. The invention can improve the flexibility and bandwidth of ultrasonic detection.

The invention relates to a closed runner reaction tank system with a flow guide plate. The closed runner reaction tank system comprises a reaction tank main body, an upper sealing cover, a lower sealing cover and at least one flow guide plate, wherein a plurality of closed runners are arranged in the reaction tank main body; the upper sealing cover and the lower sealing cover are respectively arranged at the two ends of the reaction tank main body; an inlet end and an outlet end are respectively formed on the upper sealing cover and the lower sealing cover so as to connect the closed runners; the flow guide plate is arranged between the upper sealing cover and the reaction tank main body and is used for uniformly guiding the precursor injected from the inlet end of the upper sealing cover into the closed runners.