Piezoelement for focusing ultrasonic head |
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IPC classes for russian patent Piezoelement for focusing ultrasonic head (RU 2333023):
              
 Space abnormally polarized area detector / 2319253
Proposed detector has multilayer capacitor incorporating ferroelectric ceramic components, as well as differential amplifier. Electrodes of components are disposed in first-type layer horizontally and in second-type layer, vertically. All components disposed in first-type layers are electrically interconnected in series and connected to first input of amplifier. All components disposed in second-type layers are interconnected in series and connected to second input of amplifier.
 Explosive piezo-generator / 2313891
Piezo-generator contains initiation device, blast wave generator in form of monolithic body with a charge in form of a layer of explosives and piezo-electric transformer made at least of one piezo-plate with electrodes on two opposite surfaces. The layer of explosive substance is positioned in parallel to electrodes of piezo-plate, and initiation device is mounted relatively to the layer of explosive substance with its possible initiation in given points.
 Method for improving temperature and frequency characteristics of glass-packaged crystal resonators / 2308790
Piezoid is exposed to focused pulse radiation of laser beyond disposition region of electrodes at Q-factor modulation with energy density in laser beam constriction exceeding laser destruction threshold of crystal piezoid to produce microscopic destruction therein measuring 30 to 100 μm. Impact points are chosen at distance L = (3t + 0.5) mm from piezoid electrode edge, where t is piezoid thickness in millimeters. Laser radiation energy density is below laser destruction threshold of resonator glass package residing beyond laser beam constriction region.
Ceramic material, charge for production of such material and method of production of such material / 2305669
Proposed material contains complex oxide of metals at common formula Pb(1-x-3/2y)CaxNdy[Ti0.98(W1/2Cd1/2)0.02]O3, where x=0.16-0.24 and y=0.02-0.08. Charge for production of proposed material contains oxides of titanium, tungsten, cadmium, neodymium, lead and calcium carbonate. Components of charge are mixed at preset ratio and hard phase synthesis and sintering are carried out at temperature of 1220-1250C for 2-4 h at pressure of (0.2-2)·107 Pa. Volume resistivity of material exceeds 100 Gohms·cm.
 Pulse voltage generator / 2300167
Proposed generator has a number of stages connected into Marx circuit arrangement. Each stage has one or more capacitors and discharge gap. At least one capacitor of each stage is made in the form of polarized ferroelectric working medium incorporating device for producing mechanical load therein, primarily in the form of explosive material charge. Generator is designed for off-line operation independently of external power supplies.
 Piezo-electric element and transformer of oscillations with piezo-electric element / 2298300
Transformer of oscillations contains piezo-element, which is mounted in the body. One end surface of piezo-electric element is rigidly connected to bottom of body. Another end surface represents a surface, which is sensitive to oscillations and, preferably, is not covered by body. Volume of body is filled with filling composition. Piezoelectric element is mechanically isolated from filling composition. Piezoelectric element contains porous homogeneous ceramic body and at least two electrodes connected thereto. Porous ceramic body has open pores and is covered with elastic cover, preferably across whole surface.
 Three-coordinate positioner / 2297078
Proposed positioner has object holder and case. The latter mounts three drives incorporating at least one biform member connected through first flexible pusher to movable member. Biform members are, essentially, stacks, each incorporating piezoelectric disk joined along plane with metal diaphragm. Object holder is mounted on fixed member. Object holder can be installed on movable member with aid of lever. Pushers have different stiffness. Piezoelectric disks and metal diaphragms have holes in vicinity of their connection to flexible pushers.
 Inertia motor / 2297072
Proposed inertia motor has base, piezoelectric module, rod coupled with V-shaped guide, movable carriage, and hold-down device. Piezoelectric module is mounted with its first end on base and its second end is joined with triangular-shaped rod having first, second, and third faces. Carriage has V-shaped guide coupled with first and second faces of rod; hold-down device is made in the form of flat spring secured on movable carriage and coupled through its first plane with third face of rod by means of insert.
 Piezoelectric drive of high economic efficiency / 2295802
Proposed piezoelectric drive characterized in high economic efficiency has housing accommodating thin-walled piezoelectric cylinder, electrodes exciting resonance-tuned bending vibrations, and at least two multilayer cylinders shielded by wear-resistant flexible shells within housing. Multilayer cylinders are assembled by inserting one into other for alternate vibration in convexo-concave manner relative to one another thereby varying cylinder-to-cylinder space filled with material in the form of liquid or air. This material in the form of liquid or air brought to water hammer condition in conjunction with hydraulic ram or supersonic air speed creates superfluidity of material in the form of liquid or air. In addition, proposed device is distinguished by high mechanical endurance at system resonance ensuring superconductivity; the latter and multilayer cylinders jointly provide for minimal voltage requirement for exciting and passing maximal current.
 Magnetostriction device for angular movements and method for controlling aforementioned device / 2292611
Device contains bio-magnetostriction plates, held on base by one end, and object being moved, connected to axis of device formed in place of rigid connection of other ends of bio-magnetostriction plates. Number of plates exceeds two, they are positioned radially relatively to device axis and form two groups, differing by alternation of sign of magnetostriction layers along circle. Plates of each group are magnetically interconnected. On injection of control signal into first group of bio-magnetostriction plates object being moved is turned in one direction. Second group of bio-magnetostriction performs function of mechanical load, creating reverse torque. For turning object being moved in opposite direction control signal is sent to second group of bio-magnetostriction plates. In this case first group of plates performs the mechanical load function.
 Ultrasonic vibration system / 2332266
Invention refers to ultrasonics and can be used for ultrasonic devices designed for high-intensity ultrasonic vibration effect on liquid environments. Ultrasonic vibration system with extended radiating surface is intended for introduction of higher intensity ultrasonic vibration to technological environments at vibration intensity of more than 10 Wt/cm2 and structurally contains ultrasonic converter, matching acoustic-type transformer and waveguide-analysing system. Ultrasonic piezoelectric converter is multipackaged and structurally contains piezoelectric elements assembly generating ultrasonic vibrations of energy that is accumulated in front frequency-lowering facing and transferred, through matching acoustic-type transformer, to waveguide-analysing system.
 Ultrasonic vibration system / 2323788
Ultrasonic vibration system for reception and emission of ultrasonic vibration within broad band designed on basis of multimode multifrequency structure with amplitude-frequency characteristic adjusted within demanded frequency range. Ultrasonic vibration system is functional radiating element designed as spindle or hollow cylinder, face surfaces of which are in acoustic and mechanic mode connected with two piezoelectric transducers having underfrequency pads with step-adjustable length.
 Method for automatically regulating operation of ultrasound technological device and ultrasound technological device for realization of the method / 2316804
In the method for auto-adjusting operation of ultrasound technological device, containing more than one electro-acoustic transformer, on basis of differential check connection signal, electro-acoustic transformers are excited in such a way that mechanical oscillations of one group of transformers are performed in on direction, and of remaining transformers - in anti-phase, while check connection signal is formed a difference of signals proportional to full currents through these groups of transformers. Device for realization of the method contains ultrasound generator, electro-acoustic transformers, connected to output of generator, and circuit for check connection with bridge circuit, both shoulders of which have coupled electro-acoustic transformers and balancing resistances.
 Ultrasonic technological device / 2311969
The invention is pertaining to the field of the ultrasonic engineering, in particular, to the processing equipment for ultrasonic treatment, for example, the liquid purification of the objects, impregnation, emulsification, cutting, welding, etc. Specifically, the invention concerns the rod-type resonance acoustical-electrical transducers. The technical result of the invention is provision of the possibility to feed to the acoustic loading located on one side of the transducer of the power from the both strips of the transducer. The device contains the rod-type resonance acoustical-electrical transducer having the piezoelements located between the first and second strips and reinforced by the brace rod; and the acoustic loading connected to one of the strips. Inside the transducer there is at least one cavity open from the side of the first strip and having the bottom formed by the second strip. At that the acoustic loading is connected to the second strip of the transducer inside its cavity.
 Piezoelectric electro-acoustic transformer / 2302709
Piezoelectric electro-acoustic transformer contains two bimorph piezoelectric elements, each one of which consists of metallic and piezo-ceramic plates, metallic base, including tubular element and two circular element, sound duct in form of circular resilient rubber element and input for connecting electric signal to generator. Circular elements of the base are provided with circular shelves and hermetically connected to rubber element. External cylindrical surface of the rubber element is in acoustic contact with working substance.
 Downhole acoustic instrument / 2301329
Power is supplied to downhole acoustic instrument from constant current source. Downhole acoustic instrument includes a number of independent sections working on natural resonance section frequencies. Each section is arranged in sealed case and comprises service power source, filter module, protective module, basic frequency generator, automatic frequency adjustment module, summing unit and at least two piezoelectric converters with preselected resonance frequencies. Downhole acoustic instrument section also has phase equalizers to compensate resonance frequency dispersion of piezoelectric converters, power modules, current transformers and feedback probes. Number of phase equalizers is equal to number of piezoelectric converters. Each piezoelectric converter has its own control circuit including feedback probe, phase corrector, power module and current transformer serially connected with each other. Current transformer output is linked to frequency generator through summing unit and automatic frequency adjustment module.
 Method for converting ultrasound wave and apparatus for performing the same / 2288785
In controlled sound conduit 1 having length Ls and made of non-polarized ferroelectric ceramics with abnormally high dielectric permeability, ultrasonic wave with frequency ω0 is passed. Said wave is formed by converter 4 and it interacts with electric field rotating around propagation direction of wave and generated as result of action of AC voltage supplied by means of generator 6 and phase splitter 7 upon pairs of electrodes 2, 3 arranged in sound conduit 1. Rotation frequency of electric field coincides with frequency of ultrasonic wave Ω = ω0. According to invention it is realized resonance interaction of circular component of ultrasonic wave (whose frequency and rotation sign coincide with frequency and rotation sign of electric field having intensity more than threshold value) with such electric field. In the result ultrasound absorption is prevented and in outlet of sound conduit elliptically polarized ultrasonic wave is created with intensity more than that of said wave.
 Ultrasonic oscillating system / 2284228
The invention is pertaining to the field of ultrasonic engineering, namely, to the designs of the ultrasonic oscillating systems. The technical result of the invention is the increase of the amplitude of oscillations at the simultaneous decrease of the power consumption, reduction of the overall dimensions and the mass. The ultrasonic oscillating system is made out of the packs of the piezoelectric components arranged on the oscillations forming surface of the concentrator. On the packs of the piezoelectic components there are the reflective straps, which surfaces opposite to the piezoelectic components are made flat or as varying steps in the diameter. The concentrator has the unit of fixation and ends with the surface having the working tool. The forming and emitting surfaces of the concentrator have in section the rectangular form of the equal length, and the ratio of their lateral dimensions is selected from the condition of provision of the preset factor of amplification of the concentrator. The total length of the reflective strap, the pack of the piezoelectic components and the concentrator section up to the assembly unit of fixation is equal to the sixth part of the wavelength of the ultrasonic oscillations. The length of section of the concentrator, on which the smooth radial transition is realized, and the section with the lateral dimension corresponding to the emitting surface are equal to the sixth part of the wavelength of ultrasonic oscillations.
 Piezoelectric converter to generate oscillations in building structures / 2281815
Piezoelectric converter is installed and secured in building structure body. The converter comprises bearing ring, upper and lower membranes fixed to bearing ring and upper and lower piezoelectric cells fastened to inner surfaces of upper and lower membranes correspondingly. The bearing ring has side orifice made in bearing ring body and adapted to receive pipe with electric cord passing through the pipe. The electric cord is connected with piezoelectric cell surfaces facing cavity and with inner surfaces of both membranes.
 Ultrasonic device / 2248850
Proposed ultrasonic device that can be used for cleaning (ultrasonic baths), dispersing, homogenizing, and emulsifying materials has ultrasonic converter accommodating waveguide radiating system which is in acoustic contact with converter. Waveguide radiating system has coaxially installed bending-vibration waveguides separated by longitudinal-vibration waveguide sections. Bending-vibration waveguides are disposed in planes perpendicular to axis of longitudinal-vibration waveguide axis and spaced λ/4 apart, where λ is longitudinal-vibration wavelength. Thickness of each bending-vibration waveguide installed at antinode point of longitudinal vibrations is λ/15. Thickness of each of remaining bending-vibration waveguides is λ/18. Thicknesses of converters are set by way of calculations and experiments including attaining of maximal possible cavitation capacity during liquid sonication. Total length of radiator is a multiple of λ/2.
Method of aftertreatment of children and teenagers with autoimmune thyroiditis in combination with chronic pharyngotonsillitis / 2332978
Method involves carrying out balneotherapy, foing physiotherapy exercises and intaking iodomarine and/or L-tiroksin. In first half of the day, physiotherapy exercises are performed, general artificial radon baths being performed in the second half of the day. Manual massages of a collar zone are perform in days free from baths. From November till March phonophoresis of Traumel S ointment on a thyroid gland projection is also performed with an intensity of 0.05 W/cm2, continuous regimen, duration of influence of 3-5 minutes on the right and at the left, general time of influence of 6-10 minutes, in a day with a magnetotherapy on a projection of palatine tonsils, size of a magnetic induction being 6-9 mT, for 5-6 minutes from each party, general time of 10-12 minutes, in a course of 8-10 procedures. At treatment during the period from April till October, patients are additionally prescribed a group galotherapy in the second half of the day, in a course of 10-15 procedures, and phototherapy of red range at a wavelength of 660-675 nanometers, densities of power of radiation of 1 mW/cm2 and an infra-red range at a wavelength of 840-950 nanometers, densities of power of radiation of 2.7 mW/cm2 to biologically active points: VC-20, VC-22, E-36 symmetrically on the right and the left, Gi-4 symmetrically on the right and the left. Time of influence for one point is 1.5-2 minutes, general time of influence being 9-12 minutes, daily, in 10-12 procedures, with duration of treatment making up 21-24 days.
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FIELD: medical equipment. SUBSTANCE: piezoelement for a focusing ultrasonic head is made from piezoceramics in the form of a part of a spherical cover with an angle of disclosing of 180°. In top part of a spherical cover of a piezoelement is made the flat site, its thickness coincides with thickness of part of the spherical cover, and the parity of diameter of the flat site and the diameter of part of the spherical cover makes 15-25% for provision of maximum acoustic pressure in focal maculae on resonant frequency. EFFECT: effective focusing of acoustic emission in a zone of geometrical focus of piezoelement. 7 dwg
The invention relates to medical engineering, in particular to the inhalers, medical diagnosis and so on Known to use piezoelectric focusing of the ultrasound emitter, made in the form of a bowl connected to the generator AC voltage of ultrasonic frequency, a device for applying ultrasound to the internal parts of the human body (patent Ru No. 2086178, IPC AV 8/00, AV 17/225). While focusing the ultrasound emitter is made with a constant focal distance with a variable thickness of the piezoelectric element, and the ratio of its maximum thickness is equal to the minimum of 1.01-of 1.15, and a generator of alternating voltage of ultrasonic frequency is made to control the frequency with a ratio of the maximum frequency to the minimum in the range from 0.01 to 1.15. Effect: increase the capability of increasing the dose of ultrasonic energy within the cancer-stricken areas of biological tissue. The disadvantage of this invention is a strict requirement to thickness ratio of the piezoelectric element, which is impossible with high-temperature processing of ceramics. In an ultrasonic device for the visualization and investigation of the state structures (application Ru # 96112975, IPC AV 8/14 priority from 27.06.1996,) for focusing the acoustic radiation used is by a focusing lens, made of materials with equal acoustic impedances. The disadvantage of this solution is the use of additional devices in the form of acoustic lenses, which are much more expensive and complicated device for focusing the acoustic radiation. The closest technical solution of the present invention is U.S. Pat. RU # 2139745, IPC 61N 7/00. Device for the impact of ultrasound on the internal parts of the human body, containing the focusing piezoelectric ultrasound emitter, made in the form of a bowl, the thickness and the radius of curvature of which changes depending on the angle, and the maximum ratio of radius of curvature to the minimum is 2 and the maximum thickness of the piezoelectric element is equal to the minimum of 1.01 to 1.2. The disadvantage of this device is the complex shape of the piezoelectric element which is difficult to reproduce and save in the process of its production during high-temperature treatments. If the piezoelectric element manufactured using machining, it will be very expensive. The problem to which this invention is directed, is the achievement of the technical result consists in effectively focusing the acoustic radiation in the area of the geometric focus of the piezoelectric element having the form of spherical the shell, and to increase the acoustic energy at the focal spot. The problem is solved by using a piezoelectric element for focusing ultrasonic transducer made of piezoelectric ceramics in the form of part of a spherical shell with an angle up to 180°characterized by the fact that the top part of the spherical shell piezoelectric element is made flat plot, the thickness of which coincides with the thickness of the part of the spherical shell, and the ratio of the diameter of the flat area and the diameter of the part of the spherical shell is 15-25% for maximum acoustic pressure in the focal spot at the resonant frequency. The achievement of the technical result was carried out by optimizing the geometrical shape of the piezoelectric element by means of mathematical modeling using ANSYS software. For work program was established Men Water lien. txt, which is used to calculate the characteristics of the ultrasonic radiation in the liquid and determine the parameters of the focal spot. Reviewed and calculated mathematical models of piezoceramic radiators and the dependence of the acoustic pressure in the focal region from the shape of the piezoelectric element. Thus, the distinctive features of the invention is that the top part of the spherical shell piezoelectric element is made flat plot,the thickness of which coincides with the thickness of the part spherical shell, and the ratio of the diameter of the flat area and diameter part sfericheskoi shell is 15-25% for maximum acoustic pressure in the focal spot at the resonant frequency. This set of distinctive features allows you to achieve the technical result consists in effectively focusing the acoustic radiation in the area of the geometric focus of the piezoelectric element having the form of a spherical shell, and to increase the acoustic energy at the focal spot. Thus, there is a new technical means to achieve a technical result. The invention is illustrated figure 1-7, obtained by mathematical modeling of the piezoelectric element with different sizes of flat land at the top of the spherical piezoelectric element. The calculation shows that the maximum acoustic pressure in the focal spot at the resonant frequency is observed when the ratio of the diameter of the flat part and the diameter of the spherical portion of the piezoelectric element 15-25%. When increasing the diameter of the flat part up to 60% or more piezoelectric element emits parallel acoustic beam with low divergence. Figure 1 shows the result of mathematical modeling of acoustic radiation at the resonant frequency of a spherical piezoelectric element. The acoustic pressure in the focal area of 12.5 MPa. Figure 2 shows the cut is ltat mathematical modeling module pressure acoustic radiation at the resonant frequency of a spherical piezoelectric flat part at the top, the diameter is 1 mm or ≈5% of the diameter of the spherical part. The acoustic pressure in the focal zone 40,2 MPa. Figure 3 shows the result of mathematical modeling module pressure acoustic radiation at the resonant frequency of a spherical piezoelectric flat part, the size of which is 3 mm or ≈16% of the radius of curvature of the spherical part. The acoustic pressure in the focal zone to 47.2 MPa. Figure 4 shows the result of mathematical modeling module pressure acoustic radiation at the resonant frequency of a spherical piezoelectric flat part, the amount of which is equal to 11 mm or ≈61% of the diameter of the spherical part. The acoustic pressure in the focal area is 11.9 MPa. Figure 5 shows the dependence of the level of acoustic pressure in the focal zone of the spherical piezoelectric element at the resonant frequency fr=2,64 MHz depending on the diameter of the flat area. The parameters of the focal spot is the acoustic pressure, intensity of sound waves and their energy depends on the frequency applied to the piezoelectric element AC voltage and the ratio of the size of the flat area and the radius of curvature of the spherical portion of the piezoelectric element. Analysis figure 1-6 shows that the peak acoustic pressure in the focal zone of the spherical piezoelectric element is achieved when the nalitch and in the top of the piezoelectric flat plot which is 15-25% of the diameter of the spherical part. An example of the operation of the piezoelectric element. The appearance of the piezoelectric flat part is depicted in Fig.6. 7 shows a cut of the piezoelectric element, where 1 is the spherical part of the piezoelectric element diameter ⊘, 2 - flat area, d is the diameter of the flat area, R1,2the radii of curvature of the spherical portion of the piezoelectric element. The operation of the piezoelectric element with a ratio of d/⊘˜22% is confirmed when the excitation AC voltage from the generator as part of a medical inhaler. The rate of evaporation of liquid (water) in such a piezoelectric element exceeds the rate of evaporation of liquid spherical piezoelectric element without the flat part 1.3 times. This indicates a more efficient focusing of acoustic emission piezoelectric flat part and provides technical result. Piezoelectric element for focusing ultrasonic transducer made of piezoelectric ceramics in the form of part of a spherical shell with an angle up to 180°, characterized in that the top part of the spherical shell piezoelectric element is made flat plot, the thickness of which coincides with the thickness of the part of the spherical shell, and the ratio of the diameter of the flat area and the diameter of the part of the spherical shell is 15-25% for Maxi the material of the acoustic pressure in the focal spot at the resonant frequency.
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