64results about How to "Good sound permeability" patented technology

The sound-permeable member 18 includes a waterproof sound-permeable membrane 1 that allows sound to pass therethrough and blocks liquid from passing therethrough and a main body 8 having an opening 8p for passing sound. The opening 8p is closed by the waterproof sound-permeable membrane 1. The waterproof sound-permeable membrane 1 is fixed to the main body 8 in a slack state. A polytetrafluoroethylene porous membrane and a porous ultrahigh-molecular weight polyethylene membrane preferably can be used as the waterproof sound-permeable membrane 1.

It is an object of the present invention to provide a waterproof sound-permeable hood having excellent waterproofness and excellent sound permeability. The waterproof sound-permeable hood of the present invention is formed of a waterproof material, which hood includes a waterproof sound-permeable means provided on at least one of portions respectively facing to the ears of a wearer who wears the waterproof material, wherein the waterproof sound-permeable means includes a waterproof sound-permeable membrane having a sound-transmission loss of not greater than 5 db.

The invention relates to a focusing ultrasonic energy converter for weight loosing. A self-focusing ceramic sheet of the ultrasonic energy converter presents the shape of a spherical ring with a hole in the middle, an outer ring is fixed by epoxy resin in an embedding manner through mould pressing, and an inner ring is fixed by a hollow copper stud and an epoxy resin nut in a screwing manner. A shunting tee joint, a hollow stud and a shunting pipe form a specific circulating water system. The piezoelectric ceramic sheet, an electrode slice and a rear cover are compacted and fixed by the nut and the hollow stud so as to form a crimping power supply mode. Compared with a planar ceramic energy converter using an acoustic lens, the focusing ultrasonic energy converter that adopts the self-focusing method of the ring-shaped spherical surface has the characteristics of small focusing field and high energy. The application of the installing method of the hollow stud ensures the degassing water circulation when the energy converter is in working. Moreover, the structure of the energy converter is simple, and the installing and using are convenient.

The invention discloses a focusing probe device of ultrasonic nondestructive detection used for detecting the defect of a detected sample, comprising a cylinder used for fixing the ultrasonic focusing probe; the ultrasonic focusing probe is connected with the big end of an inner cylinder in a sealing mode; the bottom end of the inner cylinder is encapsulated with a sound transmission film; a liquid medium used for transmission of the ultrasonic wave is arranged in the cylinder container of the inner cylinder; the inner cylinder provided with the probe is connected into a whole with an outer cylinder by thread in an adjustable mode; under the conditions of the same gain, the capability of detecting the defect of the sample is much better than a general straight probe; the water distance of the device leads the display distance of an initial wave, an interface wave, a defect wave and a bottom wave in the screen of a flaw detector to be pulled open and leads the area of the detected sample to be outside a triple near-field area of the ultrasonic wave on a beam axis, thus improving the resolution of waveform display and the detection sensitivity, leading the operation of finding and judging the defect wave in the process of detecting the defect to be convenient, saving a water tank and a water supply device and realizing field detection.

A micromechanical sound transducer arrangement includes an electrical printed circuit board (1) having a front side (VS) and a rear side (RS). A micromechanical sound transducer structure (3) is applied to the front side (VS) using the flip-chip method. The printed circuit board (1) defines an opening (5) for emitting soundwaves (S) in the region of the micromechanical sound transducer structure (3).

The invention discloses a wideband underwater acoustic absorption and transmission material and a preparation method thereof. The wideband underwater acoustic absorption and transmission material is prepared by adhering and compounding an acoustic absorption layer with the thickness of 2-5 mm and an acoustic transmission layer with the thickness of 10-15 mm, the acoustic transmission layer is prepared from the following components in parts by weight: 100 parts of chlorinated butyl rubber, 20-40 parts of carbon black, 5-10 parts of calcium carbonate, 5 parts of dioctyl sebacate, 5-35 parts of zinc oxide, 5-35 parts of stearic acid, 0.5-1.5 part of age resister D, 0.5-1.5 parts of accelerant TMTD (Tetramethylthiuram Disulfide) and 0.5-2.0 parts of sulfur; and the acoustic absorption layer is prepared from the following components in percentage by weight: 100 parts of chlorinated butyl rubber, 20-40 parts of carbon black, 5-10 parts of calcium carbonate, 5 parts of dioctyl sebacate, 5-35parts of zinc oxide, 5-35 parts of stearic acid, 0.5-1.5 part of age resister D, 0.5-1.5 parts of accelerant TMTD, 0.5-2.0 parts of sulfur and 0.5-2.0 parts of zinc powder or iron powder. The underwater acoustic absorption and transmission rubber material has excellent physical mechanical performance as well as and acoustic transmission and absorption characteristics and can be used for researching a special underwater acoustic frequency band.

The invention provides a neutral buoyancy type MEMS vector hydrophone, wherein the detection ability of a NEMS vector hydrophone for weak acoustical signals in the water is significantly improved. The neutral buoyancy type MEMS vector hydrophone comprises a stainless steel circuit shell, a necked shell, a fixed disc, and an insulated annular tray with a boss. The boss is provided thereon with a circular PCB board and a detection chip. The detection chip comprises a four-beam micro-structure, a sensitive cylinder body and a buoyancy ball. The insulated annular tray is provided with a sealed screw hole and a signal screw hole. A sound transmission cap arranged on the insulated annular tray and internally filled with the silicon oil is fixedly connected with the insulated annular tray. The sound transmission cap is made of latex and super elastic materials. A support frame is arranged in the sound transmission cap. According to the technical scheme of the neutral buoyancy type MEMS vector hydrophone, the sensitivity of the NEMS vector hydrophone and the depths of directive pits are greatly increased on the premise that the frequency band of the hydrophone is not influenced at all. Therefore, a good prospect is provided for the application and development of hydrophones.

The invention relates to an ultrasonic detection device for residual stress on a near surface of a hole or a cavity, wherein the device uses an array type ultrasonic sensor transmitter-receiver device, and can implement multi-point test of axial stress in a circumferential direction. In addition, dry coupling technology is used to solve a residual stress coupling problem on the surface of the hole or cavity. For reducing abrasion of an organic glass sound wedge, a transmitter-receiver device lifting mechanism is arranged. In a moving process of the stress detection device, the transmitter-receiver device is lifted, thereby avoiding friction between a sound wedge material and the hole or the cavity, and prolonging service life of the sound wedge. Cooperation usage of the detection device and a creep mechanism can implement centering of the device. Driven by an execution structure, the device can measure axial stress at any position in a deep hole. The device has a simple structure, and can effectively and conveniently implement residual stress detection on the near surface of the hole or the cavity.

The invention belongs to the field of medical care and health, and relates to a phantom model, particularly to a phantom model containing a tree-shaped pipeline structure. The phantom model provided by the invention includes a peripheral tissue colloid model and a hollow pipeline model, the hollow pipeline model is a pipeline directly formed inside the peripheral tissue colloid model, and no partition membrane or partition wall exists between the hollow pipeline model and peripheral tissue glue. The model has the advantage of good sound transmission performance, effectively guarantees the quality of a sonogram echogram, and can effectively simulate important pipeline structures in a human body (such as liver), thereby obtaining better simulation, and enabling the range of application of the model to be wider, and the phantom model can be used as a sign structure in melting technology planning, and can also be used for training of a cavity radiographic technology.

The invention relates to a cardiechema electrocardio micro in-situ synchronous detecting sensor based on an MEMS technology. The sensor comprises a shell, wherein the shell is fixedly provided with atransaudient cap, the shell is internally provided with a supporting plate, the supporting plate is provided with an MEMS sonic transducer microstructure, and the MEMS sonic transducer microstructureis composed of a supporting frame, a central mass block, cantilever beams and four varistors; the periphery of the shell is sleeved with a ring of electrocardiographic electrode, and the periphery ofthe electrocardiographic electrode is provided with a ring of sucking disc; the electrocardiographic electrode comprises a flexible conductive substrate of which the top face is designed in a pinpointtype microarray, a metal seed layer and a metal layer are sprayed sequentially on the top face of the flexible conductive substrate, and the back face of the flexible conductive substrate is coated with a conductive silver paste layer. Compared with a traditional echometer or electrocardiogram sensor, the sensor utilizes the MEMS technology to integrate cardiechema and electrocardio, thereby achieving multi-parameter joint analysis and diagnosis of a coronary heart disease, the sensitivity is high, the volume is small, batch processing can be achieved, and the cost is low.

The invention relates to a soft attachment fixing device with good sound transmission and elasticity and for ultrasonic scanning. The device comprises an attachment fixing device body, the inner surface of the attachment fixing device body is matched with the surface of an attachment part in shape, and the outer surface of the attachment fixing device body is smooth or in a grid shape. Matter capable of reflecting infrared light or laser is attached to the surface of the attachment fixing device body. By means of the device, moving precision of a probe is improved, superficial organs are fixed, minimum image transition difference is formed, gas between the attachment fixing device body and the body surface is reduced to the largest extent, and image interpolation in image reconstruction is reduced to the largest extent. Meanwhile, stability and standardization of organic shape are guaranteed during ultrasonic scanning of easily-deformed organs; customized adaptation design in different shapes is conducted on different portions of a human body, the device is attached to the surface of the irregular human body or the organs to the largest extent, regular, smooth and continuous basic image sources are obtained on the irregular surfaces, image quality is improved, and the device can be used for automatic ultrasonic scanning.

The invention discloses a fluorosilane modified polybutadiene type polyurethane underwater acoustic transmission material and a preparation method thereof. The fluorosilane modified polybutadiene typepolyurethane underwater acoustic transmission material is prepared from perfluor decyl triethoxy silane, polytrifluoro-propyl methylsiloxane, hydroxyl-terminated polybutadien, isocyanate, a chain extender and an active diluent as raw materials by using a prepolymer method. The fluorosilane modified polybutadiene type polyurethane underwater acoustic transmission material has excellent water resistance, acoustic transmission performance and comprehensive mechanical properties, and can be widely applied to underwater acoustic transmission sealing of exploration devices such as acoustic transmission windows, underwater acoustic transducers, submarine oil exploration, marine fishing and ship underwater sonar.

The invention discloses a waterproof sound transmission membrane and a mobile phone. The waterproof sound transmission membrane comprises a base material layer, a buffering layer and a sound transmission membrane layer; the sound transmission membrane layer is laminated at the back side of the base material layer; the buffering layer comprises a first layer and a second layer connected with the first layer, a water inlet hole is formed in the first layer, a water outlet hole communicated with the water inlet hole is formed in the second layer, and a distance between an axis of the water outlet hole and the axis of the water inlet hole is greater than or equal to the sum of radius from the water flow entering direction, so that after the water enters from the water inlet hole, the water passes through passages of the water inlet hole and the water outlet hole and then flows out from the water outlet hole rather than flowing out from the water outlet hole; and therefore, the waterproof sound transmission membrane has certain buffering effect on the water pressure. In addition, the waterproof sound transmission membrane also comprises a sound transmission membrane layer, so that the sound transmission performance of the waterproof sound transmission membrane can be improved.

The invention discloses an industrial coupling agent for detection of steel rails. The industrial coupling agent is prepared from the following components in parts by weight: 40 to 60 parts of ethylene glycol, 40 to 50 parts of water, 3 to 8 parts of glycerin, and 1 to 2 parts of antirust agent, and further prepared from trimethylolpropane; based on the total weight of the industrial coupling agent for the detection of the steel rails, the weight content of the trimethylolpropane is 0.5wt% to 3wt%. The invention also discloses a preparation method of the industrial coupling agent for the detection of the steel rails. The industrial coupling agent for the detection of the steel rails has the advantages that the sound transmission effect, antirust and anticorrosive properties, and low temperature-resistant property are excellent; the application prospect is broad.

The invention relates to a self-healing ultrasonic transmission biomimetic material, which consists of a phase A and a phase B, and is a self-healing ultrasonic transmission biomimetic silicone rubber-based material obtained by taking double-component addition type room-temperature vulcanized silicone rubber as a matrix and carrying out chemical modification. The material can perfectly simulate soft tissues of a human body in the aspects of touch and flexibility; meanwhile, after suturing or cutting is carried out, self-healing can be achieved after a period of time. More importantly, the material has good medical ultrasonic permeability, and can be used for simulating soft adipose tissues in an ultrasonic diagnosis and ultrasonic intervention training model.

The invention discloses a double-layer shell titanium alloy deflector shroud acoustic three-dimensional control method. The double-layer shell titanium alloy deflector shroud acoustic three-dimensional control method comprises the following steps of, firstly, determining the spatial range of an acoustic window according to agreed horizontal scanning angle and vertical angle of pitch and under thecondition that mold lines are determined; secondly, performing structure optimization on an acoustic cavity, specifically, arranging and computing the structure of non-acoustic transmission areas according to the determined range of the acoustic window; thirdly, performing acoustic modeling calculation according to the material and structure of the acoustic window; fourthly, performing vibration and noise reduction design inside the acoustic cavity, emphatically controlling the noise within the working frequency range of a sonar, applying sound absorbing materials and vibration and noise reducing materials onto the rear wall of the acoustic cavity, a sonar mounting platform and a bottom non-acoustic transmission area. The double-layer shell titanium alloy deflector shroud acoustic three-dimensional control method integrates multiple disciplines and combines engineering practical experience, thereby being high in systemic performance and operability and providing an effective engineering method for acoustic control of a bulbous bow deflector shroud.

The invention relates to a bionic acoustic transmission membrane for realizing mammary gland ultrasonic standard scanning and a preparation method thereof. The bionic acoustic transmission membrane comprises a wearable attaching and fixing accessory which comprises an elastic fiber membrane, and the elastic fiber membrane is formed by blending and weaving one or multiple of polyester resin, real silk, polyvinyl acetal, polyester cotton, combed cotton, mercerized cotton, polyurethane fiber, 3D polyurethane fiber, polyamide fiber, polyamide fiber, polyacrylonitrile fiber, polyvinyl chloride fiber, polyester fiber and polyolefin elastic fiber. A standard flexible frame for mammary gland scanning examination is built by mainly using the elastic fiber microporous acoustic transmission membrane,the bionic acoustic transmission membrane has excellent acoustic transmissivity, does not form an acoustic shadow like a silica gel stripe during ultrasonic scanning and enables mammary gland to be free of obvious displacement to form smooth ultrasonic image transition for reducing image interpolation in image reconstruction to greatest extent and improve imaging quality during three-dimensionalreconstruction.

The invention provides a curtain type projection screen. The curtain type projection screen comprises a roller and a screen curtain, the screen curtain is installed on the roller, through holes are formed in the screen curtain, loudspeakers are installed on the two sides of the screen curtain, a hanging ring is arranged a the bottom of the screen curtain, the roller is fixed to a window through fixing frames, a shaft is installed in the roller and connected with a limiting stopper, the limiting stopper is connected with a bearing, the bearing is connected with a motor, the motor is connected with a wire, the wire is connected with a control box, a plug is installed at the tail end of the wire, and hanging pieces are arranged on the roller. When the projection screen curtain needs to be used, a curtain is pulled up to shield light, in this way, the position of the curtain is used, by means of control over the size and distance of holes formed in the projection screen, sounds can penetrate through the screen without being blocked, and the projection screen curtain is good in sound transmitting effect and capable of perfectly integrating images and the sounds, and an excellent audio video environment can be created.

The invention discloses a disposable elastic protective cover for an esophagus ultrasonic probe and a use device of the protective cover. The protective cover includes a protective cover body, the protective cover body is great in elasticity, smooth and capable of reducing injuries caused by the probe to esophagus mucous membranes and avoiding cross infection to the maximum extent; meanwhile, thesound transmission effect of latex is great, and the quality of imaging is ensured. The protective cover is easy to operate and is abandoned after use, the work procedures are simplified, and the efficiency is improved; since the protective cover body is softer than the esophagus ultrasonic probe, the injuries caused to the esophagus mucous membranes and oral cavity tissue of a patient are reduced, wearing directly caused to the probe by friction, disinfection and other factors is also reduced, and the service life of the probe is prolonged; the adaptation range to diseases is enlarged, patients suffering from Aids and other communicable diseases can also receive TEE examination, and the therapeutic equality right of the patients is ensured. The use device is reasonable in design, easy tomanufacture and affordable, is adopted in hundreds of clinical application cases and has high practicability and a popularization value.

The invention discloses a low-density and low-modulus polyurethane gel capable of being used as a filling material for a marine exploration streamer and a preparation method for the same. The polyurethane gel disclosed by the invention is formed by mixing and filling hydroxyl-terminated polybutadiene polyurethane prepolymer, polyether polyol and solvent oil under the action of a catalyst, wherein the density of the polyurethane gel is lower than 0.92 g / cm<3>, and the modulus of the polyurethane gel is lower than 5 MPa. The low-density and low-modulus polyurethane gel disclosed by the invention has good cohesive property, high extensibility and self-healing property, and excellent sound transmission performance; and can be used as a filling material for a marine exploration streamer for realizing the suspension, sound transmission and sonar signal acquisition of the exploration streamer.

The invention belongs to the medical field, relates to biopsy model, containing a normal tissue glue model and a tumor glue model. The tumor glue contains the following ingredients: carrageenan and Congo red. After being embedded in ordinary carrageenan, the tumor glue model is a high-echo lump under ultrasonic display, ordinary carrageenan is colorless and semitransparent in visual inspection, and tumor glue is red and opaque, so the ordinary carrageenan and the tumor glue are strong in contrast and are easy to distinguish. The model is very suitable for serving as a model simulating puncture biopsy guidance by interventional ultrasound.

The invention relates to the technical field of sound measuring devices, and particularly relates to a novel all-weather outdoor microphone system. The novel all-weather outdoor microphone system comprises a metal perforated plate, an upper screen and a lower screen, wherein the upper screen and the lower screen are combined with a metal mesh. The upper screen and the lower screen are fixedly connected though a screen fixation part. An insulation lightning protection bird-proof stop needle is arranged on the upper screen. The upper screen is connected with the insulation lightning bird-proof stop needle through an insulation lightning protection fixing assembly. The insulation lightning protection fixing assembly is located at the top of the outside upper screen. A support rod body is arranged on the lower screen. The support rod body is fixedly connected with the lower screen through a waterproof anti-slip fixation part. The support rod body is arranged on the lower end of the lower screen. A moving device with a preload mechanism is arranged in the support rod body. An external power supply mechanism is arranged on the lower end of the support rod body. The support rod body is fixedly connected with the external power supply mechanism.

The present invention provides a pipeline hydrophone stuffing box and a usage method thereof. A diversion sheath that can be spliced wraps a hydrophone, so that a gap between the head of the hydrophone and a pipeline wall can be filled. A filling backing plate and a filling pressure cover are both circumferential split structures, after a cable is laid, the spliced diversion sheath, the filling backing plate and the filling pressure cover wrap the hydrophone, and finally the hydrophone is installed in a stuffing box base, so that the hydrophone can be installed without conventionally penetrating a tail cable of the hydrophone out of the stuffing box in advance from the interior of a pipeline, and finally laying the more disordered cable penetrating out of the stuffing box. The pipeline hydrophone stuffing box and the usage method thereof are suitable for the conditions that the head of the hydrophone is larger, and the installation is inconvenient.

The invention relates to a phased array linear array probe wedge with a focusing characteristic. The phased array linear array probe wedge comprises a first sub-wedge and a second sub-wedge which aresequentially arranged from top to bottom, the sound velocity of the first sub-wedge is c1, the acoustic impedance of the first sub-wedge is Z1, the sound velocity of the second sub-wedge is c2, the acoustic impedance of the second sub-wedge is Z2, the sound velocity c1 of the first sub-wedge is greater than the sound velocity c2 of the second sub-wedge, and the acoustic impedance Z1 of the first sub-wedge is smaller than the acoustic impedance Z2 of the second sub-wedge; and the interface between the first sub-wedge and the second sub-wedge is a circular arc surface, and the horizontal position of the central axis of the circular arc surface is positioned at the horizontal center of the wedge. The acoustic impedance of the first sub-wedge is matched with the acoustic impedance of the second sub-wedge to improve the ultrasonic wave transmittance of a linear array probe wafer / first sub-wedge interface, the first sub-wedge / second sub-wedge interface and a second sub-wedge / detected workpiece interface, so the phased array linear array probe wedge with the focusing characteristic has a better sound transmitting effect than a traditional phased array wedge; and the contact surface of thewedge and the surface of the detected workpiece is a plane, so the coupling effect in the detection process is maximally ensured.

The invention discloses a fluorosilane modified polyether type polyurethane underwater sound transmission material and a preparation method thereof. The fluorosilane modified polyether polyurethane underwater sound transmission material is prepared from perfluorodecyl trimethoxy silane, polytrifluoropropyl methyl siloxane, polytetrahydrofuran glycol, isocyanate, a chain extender and a reactive diluent through a prepolymer method; and the fluorosilane modified polyether type polyurethane underwater sound transmission material has excellent water resistance, cold resistance and sound transmission performance, and can be widely applied to detection devices such as submarine oil exploration, ocean fishing and ship underwater sonar.

The invention discloses a deep-sea high-sensitivity optical fiber hydrophone, which belongs to the field of underwater target monitoring, communication and measurement systems, and comprises an elastic cylinder, an inner mandrel, an outer sleeve and an induction optical fiber; wherein the elastic cylinder is positioned between the inner mandrel and the outer sleeve, the inner mandrel is positionedin the middle of the outer sleeve, and the outer sleeve is positioned in the middle of the inner mandrel. The size of the elastic cylinder is changed under the action of sound pressure, and the outersleeve is used for providing hydrostatic pressure resistance; the sensing optical fiber is wound on the elastic cylinder, the length of the sensing optical fiber changes along with the change of thesize of the elastic cylinder, and then a sound pressure signal is converted into a phase signal to be measured. According to the invention, the elastic cylinder senses that an external sound pressuresignal is compressed and deformed, the sensing optical fiber wound on the elastic cylinder is elongated, and the elastic cylinder does not need to provide hydrostatic pressure resistance, so that highsensitivity can be provided. Therefore, the technical problem that the sound pressure sensitivity is generally low in the prior art is solved.

The invention discloses an operation board for an elevator and the elevator, and belongs to the technical field of elevators. The operation board for the elevator is designed for solving the problem that existing fire elevators are low in protection level. The operation board for the elevator comprises a panel, a box body hinged to the panel, a display window, an interphone, waterproof buttons and an overhaul structure, wherein the display window, the interphone, the waterproof buttons and the overhaul structure are arranged on the panel; a plurality of clamps are evenly arranged on the panel, and the box body can be clamped to the panel through the clamps; strip-shaped sponges are bonded to the edges of the box body; a sealing layer is arranged on the edge of the display window; and rubber pads are arranged between the waterproof buttons and the panel. The operation board for the elevator is high in waterproof level and good in using effect. The elevator provided by the invention comprises an elevator car which is internally provided with the operation board. The elevator is high in waterproof level and safety coefficient.

A low-density polyurethane gel composition used for reducing vibration and noise of underwater acoustic equipment is prepared from the organic chemical containing hydroxy group, the organic compound containing isocyanate group and diluent. Its advantages are high acoustic penetrability, low specific weight, not freezing at low temp and high viscoelasticity.