341 results about "Mechanical wave" patented technology

A chest piece for a stethoscope has a housing with a cavity. The cavity has a cavity surface which is paraboloid in shape, having an apex, an axis, and a focal point. The cavity terminates at the apex and an opening, and the focal point resides in the cavity. A transducer is positioned at the focal point. The parabolic shape of the cavity surface acts to reflect sound waves transmitted normal to the opening to the transducer, while reflecting other sound waves. A mechanical wave guide with a series of parallel passages preferably extends across the opening. Preferably, a membrane with a convex surface covers the opening. The cavity is preferably filled with a liquid or gel having physical characteristics similar to human flesh. To reduce noise from motion of the chest piece across the skin, the stethoscope can be activated by a pressure switch responsive to fluid pressure inside the cavity.

A system for monitoring mechanical waves from a machine which in operation has moving particulate matter therein, the system including at least one sensor located on the machine at a location away from the central axis of the machine, the sensors being for sensing acoustic waves and including a transmitter for transmitting signals representing the sensed mechanical waves to a receiver at a location remote from the sensor(s), a data processor connected to the receiver for receiving signals from the receiver which signals represent the mechanical waves and processing the signals to produce output signals for display on a display means, wherein the output signals for display represent one or more parameters indicative of mechanical waves emitted from the machine over a predetermined period of time.

A method of near-field imaging of a region of interest includes emitting an input of near-field electromagnetic radiofrequency energy from a near-field source device into the region of interest, detecting a mechanical wave response generated in the region of interest in response to the near-field electromagnetic energy input using a detector device, and providing image data representing an image of the region of interest based on the mechanical wave response.

The invention discloses a light two-component soft thin layer local resonance acoustic material structure. The same kind of light flexible materials provide weight and elasticity, and another kind of light flexible materials provide a two-component soft thin type local resonance unit with local rigidness. The local resonance unit can control transmission of mechanical waves 2-3 magnitude orders larger than structure size, and a wide band gap is achieved. According to the structure, a full band gap can be opened under the low-frequency stage below 500 Hz, a vertical band gap can be formed at the super-low-frequency stage below 100 Hz, and the requirements for low-frequency damping and noise reducing of thin-wall pieces such as a carrying tool can be well met. The designed structure has the advantages of being low in thickness, light in weight, soft, wide in vertical band gap and convenient to machine, material cost is low, the structure can be directly arranged on carrying tools such as a bus and a train conveniently, and an effective solution is provided for low-frequency damping and noise reducing of a practical carrying tool.

In combined methods for treating a patient using time-varying magnetic field, treatment methods combine various approaches for aesthetic treatment. A magnetic field generating device is placed proximate to a body region of the patient. The magnetic field generating device generates a time-varying magnetic field with a magnetic flux density in a range of 0.5 to 7 Tesla. The time-varying magnetic field is applied to the body region of the patient in order to cause a contraction of a muscle within the body region. A second therapy may be used by applying one or more of optical waves, radio frequency waves, mechanical waves, negative or positive pressure or heat to the body region of the patient.

Tools and techniques for suppressing fires. Such tools might transmit a signal that generates one or more waves (which might be mechanical waves, electromagnetic waves, and/or the like) that is sufficient to disrupt the relationship between the electrons in a fire and the ionized nuclei to which those electrons are attracted. The resulting repulsion (between the nuclei and/or the electrons) that form the plasma of the fire can serve to disperse the plasma, thereby suppressing the fire.

The invention relates to an ultrasonic flotation method and a device and application thereof, which comprise the following steps: arranging an ultrasonic device in or outside a floatation tank body, starting the ultrasonic device when the floatation device carries out the mineral floatation, using ultrasonic waves to irradiate floatation pulp, providing a high-energy elastic mechanical wave to the pulp, initiating an ultrasonic cavitation effect, generating a large number of cavitation bubble particle flows which flow at high speed, and effectively washing the surfaces of the ore particles in the pulp to enable target ore particles to expose the fresh surfaces; at the same time, using ultrasonic energy to improve the activity of medicament in the pulp, quickening adsorption process of the medicament and the surfaces of the target ore particles to further improve the effects of breaking, restructuring and floating of mineralized bubbles in a pulp system, and thus realizing the optimization of flotation process.

The invention provides a swing-mechanical wave power generation device, which comprises a case, a generator, an energy-storage flywheel, a one-way movement transfer mechanism, a floater and a connecting rod. The generator, the energy-storage flywheel and the one-way movement transfer mechanism are arranged in the case, the energy-storage flywheel is arranged on an output shaft of the one-way movement transfer mechanism, the generator is connected with the output shaft of the one-way movement transfer mechanism, and the floater is connected with an input shaft of the one-way movement transfer mechanism through the connecting rod. The wave collecting floater is in the shape of a duck belly, so that heaving and rolling movements of waves can be effectively captured. The one-way movement transfer mechanism is adopted to transfer the swing of the duck-belly type wave collecting floater into one-way movement on the output shaft, so that the use efficiency of the wave energy can be greatly increased. The energy-storage flywheel is arranged on the output shaft, so that the output on the output shaft can be more stable, and the stability and efficiency of the system is improved.

The invention discloses a deicing method for a high-voltage line, with the technical proposal as follows: detecting the natural frequency of an ice body; generating a mechanical wave with the same striking frequency with the natural frequency of the ice body for striking the ice body; and shaking off the ice body attached to the high-voltage line. The deicing method comprises the following steps: step 1, striking a barrier in the front, and receiving a reflected wave; step 2, determining whether the frequency of the returned reflected wave is the natural frequency of the ice body; and step 3, adjusting the striking frequency of a striking motor to be identical with the natural frequency of the ice body if the frequency of the returned reflected wave is the natural frequency of the ice body, and striking the ice body. A deicing device for the high-voltage line includes an outer shell (2), and further includes a travel mechanism, a detection and control mechanism and a power supply mechanism, wherein a deicing mechanism is arranged at least at one end of the travel mechanism; the detection and control mechanism is respectively connected with the travel mechanism, the deicing mechanism and the power supply mechanism. The deicing method can remove 70-94% of the ice on the high-voltage line, thereby efficiently reducing the weight of the ice covering the high-voltage line.

A process for preparing the single-mode optical fibre with low polarization mode dispension features that a kneading system installed at downstream of drawing tower has a kneading wheel whose axis is periodically swinging in the plane parallel to drawing direction, and when the keading wheel is driven by high-speed moving optical fibre to show an angle, the generated torsion is transmitted to the softened glass body at upstream to generate the plastic deformation and solidify it in optical fibre, resulting in disordered non-sine torsion distribution to lower the polarization mode dispersion.

An imaging apparatus (100), configured for thermoacoustic tomographic imaging a region of interest (2) in an object (1), comprises a source device (10) being arranged for emitting an electromagnetic energy input into the region of interest (2), a detector device (20) being arranged for detecting mechanical wave response signals generated in the region of interest (2) along multiple angular projection directions in response to the electromagnetic energy input, and an image data acquisition and processing device (30) being arranged for providing tomographic image data representing the image of the region of interest (2) on the basis of the mechanical wave response signals, wherein the source device (10) is adapted for continuously emitting the electromagnetic energy input with a predetermined input modulation, and the image data acquisition and processing device (30) is adapted for converting the mechanical wave response signals into the frequency domain and for performing data processing and image reconstruction in the frequency domain or in the time domain. Furthermore, an imaging method for thermoacoustic tomographic imaging a region of interest (2) in an object (1) is described.

A vibrator coil (10) is applied to the skull (30) by adaptation of a commercially available transcranial Doppler monitoring harness (40) during MR applies mechanical waves in the acoustic waves through the skull to the brain. Utilizing magnetic resonance elastography (MRE), non-invasive estimation of tissue elastic properties in three dimensions occurs. The propagation of the acoustic waves through brain tissue, coupled to phase alteration of voxel isochromats in the presence of applies motion encoding magnetic field gradients allows measurements of brain elasticity.

The invention discloses a crystalline lens biomechanics and optical property noninvasive in-vivo imaging system and a measuring method. The ultrasonic load system provides mechanical waves capable of enabling a crystalline lens to deform, a spectral domain OCT system achieves the structure and elastic imaging of the crystalline lens; on the basis of the yoke eliminating technology, OCT full-range imaging is achieved, full anterior segment two-dimensional or three-dimensional structure images from the anterior corneal surface to the retrolental surface, morphological and optical characteristic parameters of the crystalline lens are obtained through calculation, and a crystalline lens topographic map is constructed. Meanwhile, the phase sensitive OCT technology is utilized, strain distribution in the depth direction of the crystalline lens is obtained, and a two-dimensional or three-dimensional biomechanical characteristic distribution diagram of the crystalline lens is obtained through rebuilding. High-resolution imaging and precision measurement of biomechanics and optical properties of the crystalline lens provide the more comprehensive and complete imaging surveying basis for fundamental research, early diagnosis, operation plan formulating and postoperation result evaluation of cataract and other crystalline lens diseases, and the important practical significance and clinical significance are achieved.

An ultrasonic fracking system and methods of using the same to extract hydrocarbons from underground geological formations (e.g., oil shale, coal beds, etc.) are disclosed. The system includes piezoelectric devices that are used to produce ultrasonic mechanical vibrations and induce fractures in the geological formations. In one embodiment, a system for extracting underground hydrocarbons comprises a plurality of piezoelectric devices capable of producing mechanical waves sufficient to fracture oil shale and other geological formations, a system of delivery for innocuous proppants to create a path of least resistance for enhanced hydrocarbon flow, and a vacuum pump connected to the fractures created by the piezoelectric devices to assist in removing the hydrocarbons.

Provided is a needle-plate electrode medium space charge and partial-discharge ultrahigh-frequency signal synchronous measurement device in the field of electric variable measuring. An inner insulation piece is arranged in the middle of an outer insulation piece in a sleeved mode. The outer side of the inner insulation piece is provided with a tooth structure. The top end of a needle electrode is provided with a metal voltage-sharing ball. The bottom end of the needle electrode penetrates through middle through holes of the inner insulation piece and the outer insulation piece respectively. A height adjusting gear is matched with the tooth structure on the outer insulation piece. By rotating the height adjusting gear, the relative positions of the inner insulation piece and the outer insulation piece are adjusted, the proper distance between the needle electrode and a lower electrode is selected, a voltage pulse is applied at the top end of the needle electrode, vibration of a liquid oil sample to be detected is generated, mechanical wave signals are sent out, the mechanical wave signals are received by a piezoelectric film and are converted into voltage signals, and accordingly space charge distribution in the liquid oil sample to be detected is reflected. Space charge and partial-discharge ultrahigh-frequency signal synchronous measurement under needle-plate electrodes of liquid or solid media is achieved.

The invention relates to a piezoelectric and/or pyroelectric composite solid material, referred to as a hybrid material, including: a solid dielectric matrix (11), a filler of at least one inorganic piezoelectric and/or pyroelectric material, characterised in that said filler includes filiform nanoparticles (12) distributed throughout the volume of the solid dielectric matrix (11) with an amount by volume of less than 50%, and in that the main directions of elongation of the filiform nanoparticles (12) of the inorganic filler distributed in the dielectric matrix (11) have a substantially isotropic distribution in the solid dielectric matrix (11). The invention also relates to a method for manufacturing and using such a hybrid material for the production of structural parts and supported films deposited on the surface of such a substrate for the purpose of: detecting mechanical stress by direct piezoelectric effect; detecting temperature variations by direct pyroelectric effect; creating a mechanical wave by reverse piezoelectric effect in a flexible audio device, in a de-icing device or in a mechanical anti-fouling device; and manufacturing a soundproof material.