| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 367189000 | Vibrator-type transmitter | 49 |
| 20090059727 | SYSTEMS AND METHODS FOR MINIMALLY-INVASIVE OPTICAL-ACOUSTIC IMAGING - An imaging guidewire can include one or more optical fibers communicating light along the guidewire. At or near its distal end, one or more blazed or other fiber Bragg gratings (FBGs) directs light to a photoacoustic transducer material that provides ultrasonic imaging energy. Returned ultrasound is sensed by an FBG sensor. A responsive signal is optically communicated to the proximal end of the guidewire, and processed to develop a 2D or 3D image. In one example, the guidewire outer diameter is small enough such that an intravascular catheter can be passed over the guidewire. Techniques for improving ultrasound reception include using a high compliance material, resonating the ultrasound sensing transducer, using an attenuation-reducing coating and/or thickness, and/or using optical wavelength discrimination. Techniques for improving the ultrasound generating transducer include using a blazed FBG, designing the photoacoustic material thickness to enhance optical absorption. Techniques for distinguishing plaque or vulnerable plaque may be used to enhance the displayed image. | 03-05-2009 |
| 20090147627 | MULTILAYER BACKING ABSORBER FOR ULTRASONIC TRANSDUCER - A multilayer backing absorber for use with an ultrasonic transducer comprises an elemental multilayer having at least one metal layer and at least one adhesive layer, wherein the backing absorber is adapted to be coupled to a vibrating layer of the ultrasonic transducer. | 06-11-2009 |
| 20100103778 | Sensory signal output apparatus - The present invention provides a sensory signal output apparatus, which is constructed such that several frequencies of output can be realized. The sensory signal output apparatus includes a coil ( | 04-29-2010 |
| 20100165793 | ULTRASONIC VIBRATION TRANSDUCER FOR ULTRASONIC DRILLING - The invention relates to an ultrasonic vibration transducer ( | 07-01-2010 |
| 20100165794 | PIEZOELECTRIC ACTUATOR AND ELECTRONIC DEVICE - Provided is a small-size thin piezoelectric actuator which can be mounted on a mobile electronic device and operate with a low power consumption also provided is an electronic device which uses the piezoelectric actuator to provide a function to give a contact feeling of a three dimensional movement to a users hand palm. The piezoelectric actuator ( | 07-01-2010 |
| 20100232260 | ELECTROMAGNETIC SEISMOLOGY VIBRATOR SYSTEMS AND METHODS - Described herein are embodiments of an electromagnetic system that can be used to replace the traditional hydraulic oil systems that actuate mass movement. The embodiments described herein provide wide frequency range operation, ground force application with high fidelity, and low environmental impact. Embodiments described herein can be used for seismic exploration and vibroseis applications, among other uses. | 09-16-2010 |
| 20100271908 | Tectonic discharger - The structure for severe earthquakes prevention includes :
| 10-28-2010 |
| 20110026367 | Acoustic Transducer - The acoustic transducer includes one or more membranes which cover cavities on a substrate by means of a uniformly thick polymer layer produced by vapor deposition. In the region of the cavities vapor deposition is performed on the surface of a liquid, which subsequently may be removed from the cavities via channels. | 02-03-2011 |
| 20110182149 | CAPACITIVE ELECTROMECHANICAL TRANSDUCER - Provided is a transducer in which electrodes in a movable region are less likely to affect the mechanical characteristics of the movable region and in which nonuniform electrical potential distribution of the surface of the electrodes in the movable region is suppressed. The transducer includes first electrodes and second electrodes opposing the first electrodes with gaps interposed between therebetween. The resistance per unit area of the first electrodes differs in a movable region relative to the second electrodes and an unmovable region relative to the second electrodes. The first electrodes in the movable region and the first electrodes in the unmovable region have different thicknesses. | 07-28-2011 |
| 20110182150 | ACTUATOR APPARATUS WITH COMB-DRIVE COMPONENT AND METHODS USEFUL FOR MANUFACTURING AND OPERATING SAME - Actuator apparatus comprising at least one moving elements, each comprising comb drive apparatus including at least first and second comb elements at least one of which is free to be in motion in a medium, and a controller controlling the motion responsive to an input signal representing a desired sound. | 07-28-2011 |
| 20110273966 | Reducing Noise in Seismic Surveying Environment - In one embodiment of the invention a method includes (a) operating a combustion engine at a first activity level corresponding to a first noise level; (b) charging an accumulator with a first pressure input; (c) lowering engine activity level of the engine to a second activity level corresponding to a second noise level that is lower than the first noise level; and (d) seismic sweeping with the vibrator based on the first pressure input and lowering engine noise from the first noise level to the second noise level. | 11-10-2011 |
| 20120147709 | ELECTROMAGNETIC SEISMIC VIBRATOR ARCHITECTURE - Aspects described herein relate to an electromagnetic seismic vibrator (EMSV) architecture that provide wide frequency range operation, ground force application with high fidelity, and low environmental impact. The EMSV architecture can include a base member that can support a force coil and mitigate electrical heating due, at least in part, to spurious currents. The EMSV architecture can include means for restricting movement of a reaction member included in the EMSV architecture relative to the base member. Such means can permit mitigation of damage of the EMSV architecture in scenarios in which control of the EMSV architecture may fail. | 06-14-2012 |
| 20120269040 | Seismic Vibrator Having Composite Baseplate - A seismic vibrator has a baseplate composed at least partially of a composite material. The baseplate has a body composed of the composite material and has top and bottom plates composed of a metallic material. The top plate supports isolators for isolating the vibrator's mass and frame from the baseplate. Internally, the composite body has a central structure to which couple stilts for supporting the mass and a piston for the vibrator's actuator. A lattice structure surrounds the central structure. This lattice structure has radial ribs extending from the central structure and has radial ribs interconnecting the radial ribs. | 10-25-2012 |
| 20120294124 | DEVICE AND SYSTEM FOR MEASURING MATERIAL THICKNESS - A piezoelectric sensing device is described for measuring material thickness of target such as pipes, tubes, and other conduits that carry fluids. The piezoelectric sensing device comprises a substrate such as a flexible circuit material, a piezoceramic element, and a solder layer disposed therebetween. These features are arranged in manner that provides a low-profile measurement device suitable for high-temperature applications such as those applications in which the temperature exceeds 120° C. Embodiments of the piezoelectric sensing device can be configured for use as stand-alone units separately located on the target or for use as a string of sensing elements coupled together by way of the flexible circuit material. | 11-22-2012 |
| 20120307597 | SYSTEM AND METHOD FOR DETERMINING A FREQUENCY SWEEP FOR SEISMIC ANALYSIS - A sweep generator is employed to generate a sweep to be used by a seismic vibrator device for generating a desired target output spectrum, wherein the frequency sweep is designed so as to comply with one or more constraints imposed by the seismic vibrator device and/or imposed by the environment in which the device is to be used. In one embodiment, a sweep generator determines a sweep for achieving a desired target output spectrum by a given seismic vibrator device in compliance with at least a pump flow constraint imposed by the seismic vibrator device. In another embodiment, a sweep generator determines a sweep for achieving a desired target output spectrum by a given seismic vibrator device in compliance with all of multiple operational constraints of the seismic vibrator device, such as both mass displacement and pump flow constraints. Environmental constraints may also be accounted for in certain embodiments. | 12-06-2012 |
| 20120314543 | SIGNAL GENERATION DEVICE - Provided is a signal generation device used for an information input method using an ultrasonic signal. Contact electrodes which are formed in a flexible printed circuit board to be in contact with an ultrasonic wave generation unit and reference signal generation units are disposed in a row, so that a length of the flexible printed circuit board can be reduced. Accordingly, in comparison with a signal generation module in the related art, a length of the signal generation module can be reduced, so that the signal generation device can be miniaturized. In addition, in order to maintain the contact between contact electrodes of the flexible printed circuit board and the ultrasonic wave generation unit, the contact electrodes which are in contact with the ultrasonic wave generation unit and the flexible printed circuit board are surrounded by a contact maintaining member which is constructed with a cylindrical elastic member. | 12-13-2012 |
| 20130028055 | HIGH DIRECTIVE ULTRASONIC TRANSDUCER - Disclosed is a high directive ultrasonic transducer that can concentrate a radiated ultrasonic wave in one direction by making an orientation angle of the radiated ultrasonic wave small in an ultrasonic transducer having a planar radiation plate structure, which has high radiation efficiency in an air medium. The high directive ultrasonic transducer according to the present disclosure includes a planar radiation plate configured to radiate an ultrasonic wave into a medium; a driving unit configured to vibrate the radiation plate in a higher order mode of a secondary order or more by applying predetermined force to a bottom surface of the radiation plate; and a matching layer formed in a height corresponding to 1/4 of an ultrasonic wavelength in the medium, in a part having a positive vibration velocity on a top surface of the radiation plate. | 01-31-2013 |
| 20130114379 | ATTENUATING MASS FOR AN ULTRASONIC SENSOR, USE OF EPOXY RESIN - Temperature stability at the temperatures prevailing in a motor and stability that is required over an entire temperature range are provided by an attenuating mass. This enables continuous use at temperatures of approximately 150° C. while providing ultrasonic attenuation at low temperatures. | 05-09-2013 |
| 20130155817 | CELL, ELEMENT OF ULTRASONIC TRANSDUCER, ULTRASONIC TRANSDUCER INCLUDING THE SAME, AND METHOD OF MANUFACTURING CELL OF ULTRASONIC TRANSDUCER - An element of an ultrasonic transducer includes a first substrate, at least one cell of the ultrasonic transducer arranged above the first substrate, and a second substrate arranged under the first substrate, in which a first power supply for applying an electric signal to the first substrate is formed. | 06-20-2013 |
| 20130163385 | HIGH-FREQUENCY CONTENT BOOST FOR VIBRATORY SEISMIC SOURCE AND METHOD - Computer software, controller and method for generating a desired pilot signal for driving a vibratory source. The method includes steps for selecting a pilot target amplitude spectrum for the vibratory source; determining an initial pilot signal that matches the pilot target amplitude spectrum; associating the initial pilot signal with first and second frequency bands, the second frequency band including a high-frequency end of a range of the vibratory source; band-passing a first part of the initial pilot signal associated with the first frequency band with a first band-pass configuration; band-passing a second part of the initial pilot signal associated with the second frequency band with a second band-pass configuration; level compressing the first and second parts of the initial pilot signal; recombining the first and second parts of the initial pilot signal to form a recombined pilot signal; and processing the recombined pilot signal to obtain the desired pilot signal. | 06-27-2013 |
| 20130163386 | BURIED PRESSURIZED VOLUMETRIC SOURCE AND METHOD - A seismic source configured to generate seismic waves underground. The source includes a tank configured to be buried underground, the tank having a cavity; an actuation mechanism provided inside the cavity, wherein the actuation mechanism is configured to have at least one movable part that moves back and forth to generate a seismic wave having a desired frequency; and a first fluid provided inside the cavity and around the actuation mechanism and configured to transform the back and forth movement of the at least one movable part into a varying pressure that directly acts on walls of the tank. | 06-27-2013 |
| 20130188459 | DOWNHOLE HETERODYNED ECCENTRIC VIBRATOR - The invention relates to delivering seismic energy with rotating eccentrics where the eccentrics are driven at relatively high, but different rotational rates create a heterodyned frequency of seismic energy into the earth from a downhole location. The rotating eccentrics may be rotated in opposite directions to deliver pressure waves or in the same direction to create a shear component to the seismic impulses. | 07-25-2013 |
| 20130201799 | SWEEP DESIGN FOR SEISMIC SOURCES - A system and method are described herein for generating a frequency sweep signal set for use in seismic data gathering. Low frequency sweep rate modifications are combined to compensate for vibrator limitations and vibrator far-field responses with high frequency sweep rate modifications to compensate for absorption, and then the frequency sweep signal set is generated based on the combination of high and low frequency sweep rate modifications. | 08-08-2013 |
| 20130250733 | SEISMIC FREQUENCY SWEEP ENHANCEMENT - A method of performing a seismic sweep includes forming a composite force profile; constructing a target seismic frequency sweep using the composite force profile; and operating a seismic source using the constructed target frequency seismic sweep. | 09-26-2013 |
| 20130286788 | ELECTRICAL ENERGY ACCUMULATOR - The invention is an electric power accumulator used with an electric sweep type seismic vibrator source of the type used in seismic prospecting for hydrocarbons. The source uses an engine and generator combination to create electric power to drive a frame of linear electric motors that direct a rod or piston to contact the ground in a recurring fashion. The source may also be designed to use electric power to drive the source from location to location through a survey area. A large electric power accumulator is provided to store electric power when the generator is able to produce excess power and the accumulator may deliver power along with the generator to drive the rods and deliver acoustic energy. With a large electric power accumulator, such as a battery or capacitor, the engine and generator combination may be engineered to be somewhat smaller, less costly and more efficient than a system where the engine and generator were sized to provide the electric power at times of maximum electric draw. | 10-31-2013 |
| 20130286789 | ACTIVE ISOLATION APPARATUS - The invention is an electric sweep type seismic vibrator source of the type used in seismic prospecting for hydrocarbons. The source uses an engine and generator combination to create electric power for all systems on the source such as driving a frame of linear electric motors that direct a rod or piston to contact the ground in a recurring fashion along with driving the source from location to location through a survey area. The seismic source further includes an active isolation system that provides for significant weight on the ground through the rods of the linear electric motors, but protects the vehicle body and the remainder of the systems on the seismic source to be insulated from the harshest vibration related to the acoustic energy being applied to the ground. The active isolation system may include reactive elements such as pneumatic and hydraulic shock absorbers, but also includes active elements such as linear motors operated to counteract the impulsive forces from conveying through the frame of the seismic source. | 10-31-2013 |
| 20130286790 | SIMULTANEOUS COMPOSITE LAND SEISMIC SWEEP - The invention is an electric sweep type seismic vibrator source of the type used in seismic prospecting for hydrocarbons. The source uses an engine and generator combination to create electric power for all systems on the source such as driving a frame of linear electric motors that direct a rod or piston to contact the ground in a recurring fashion along with driving the source from location to location through a survey area. Preferably a foot is arranged on the bottom end of the rod or piston for contact with the ground and by engaging the grid of motors to push down against the ground to create impulses that deliver acoustic seismic energy into the earth for geophones to sense and record. However, the pulses of seismic energy are delivered in a distinctive fashion where different linear motors are deliberately and concurrently providing different signals that create a distinctive composite signature or signal that can be identified in the data record for source separation purpose. | 10-31-2013 |
| 20130301395 | ULTRASOUND PROBE THERMAL DRAIN - An ultrasound probe includes a thermal drain across which heat is thermally conducted from an ultrasound transducer to an outer polymeric casing wall of the ultrasound probe. | 11-14-2013 |
| 20130301396 | HOUSING FOR VIBRATION GENERATING APPARATUS AND VIBRATION GENERATING APPARATUS INCLUDING THE SAME - There is provided a housing for a vibration generating apparatus, the housing including: a bracket including a protrusion part protruding from an edge thereof; and a case coupled to the bracket and having an insertion hole into which the protrusion part is inserted when the case is coupled to the bracket. | 11-14-2013 |
| 20140003197 | SYSTEM AND METHOD FOR DETERMINING A FREQUENCY SWEEP FOR SEISMIC ANALYSIS | 01-02-2014 |
| 20140043945 | SEISMIC VIBRATORY ACQUISITION METHOD AND APPARATUS - A method and related apparatus are described for generating acoustic signals for use in a vibratory seismic survey, including at least two different sweep signals for the control of at least two different types of vibrators; and matching the phases of the different sweep signals at a transition frequency from one sweep signal to another. | 02-13-2014 |
| 20140092712 | Sonotrode with Processing Channel - The present invention relates to an ultrasonic sonotrode with a main sonotrode body and a sealing area arranged on one side of the main sonotrode body. The main sonotrode body has two through-slits extending in or through the main sonotrode body respectively along a slit axis. These through-slits intersect in such a way that a through-channel through the main sonotrode body is formed from the one through-slit into the other through-slit. This creates a slit portion that is formed both by the one through-slit and the other through-slit. Provided in this main sonotrode body is a processing channel, which extends along a processing channel axis from a side area of the main sonotrode body up to the through-channel and is arranged substantially symmetrically about the processing channel axis. | 04-03-2014 |
| 20140112106 | DEVICE FOR GENERATING RADIAL ULTRASOUND OSCILLATIONS - The invention is directed to a device for generating ultrasound oscillations. In order to be able to excite with the device oscillations in a vessel simultaneously and uniformly from several sides, the device includes a resonator which oscillates radially in several directions during operation of the device. | 04-24-2014 |
| 20140247698 | PRE-COLLAPSED CAPACITIVE MICRO-MACHINED TRANSDUCER CELL WITH PLUG - The present invention relates to a pre-collapsed capacitive micro-machined transducer cell ( | 09-04-2014 |
| 20140376335 | OSCILLATION DEVICE - A vibration member ( | 12-25-2014 |
| 20150009782 | ULTRASOUND PROBE AND METHOD OF OPERATING AN ULTRASOUND PROBE - An ultrasound probe contains an ultrasound transducer arrangement that is formed with a plurality of transducer elements. The transducer elements are arranged next to one another in a row and they can be controlled with a time delay. The transmitting/receiving surfaces of the transducer elements are inclined relative to one another such that the angle of inclination between the transmitting/receiving surfaces of two transducer elements increases with the number of transducer elements located between the transducer elements. At least two of the incremental angles of inclination between each pair of adjacent transducer elements are different. | 01-08-2015 |
| 20150109889 | ACOUSTIC TRANSDUCER WITH MEMBRANE SUPPORTING STRUCTURE - An acoustic transducer includes a base plate, a vibrating membrane and a back plate. The vibrating membrane covers an opening of the base plate and has a plurality of conjoint vibratile portions. The acoustic transducer further has a connecting portion that is connected to a boundary between each two of the adjacent vibratile portions so as to allow the vibratile portions to generate vibration independently. The vibratile portions are geometrically different. Thereby, the vibratile portions can vibrate independently. This allows a designer to easily enhance the dynamic range of the acoustic transducer by geometrically modifying the vibrating membrane without increasing the total area of the vibrating membrane while maintaining a certain good degree of sensitivity and signal-to-noise ratio. | 04-23-2015 |
| 20150117157 | INTEGRATED PASSIVE AND WIRELESS SENSOR - A passive and wireless sensor is provided for sensing at least one of magnetic field, temperature or humidity. The sensor can provide only one of the sensing functions, individually or any combination of them simultaneously. It can be used for various applications where magnetic field changes, temperature and/or humidity need to be measured. In one or more embodiments, a surface acoustic wave (SAW) sensor is provided that can measure one or more of a magnetic field (or current that generates the magnetic field), temperature and humidity. In one or more embodiments, a magnetoimpedence (MI) sensor (for example a thin film giant magnetoimpedance (GMI) sensor), a thermally sensitive (for example a Lithium Niobite (LiNbO | 04-30-2015 |
| 20150346364 | SYSTEM AND METHOD FOR DETERMINING A FREQUENCY SWEEP FOR SEISMIC ANALYSIS - A sweep generator is employed to generate a sweep to be used by a seismic vibrator device for generating a desired target output spectrum, wherein the frequency sweep is designed so as to comply with one or more constraints imposed by the seismic vibrator device and/or imposed by the environment in which the device is to be used. In one embodiment, a sweep generator determines a sweep for achieving a desired target output spectrum by a given seismic vibrator device in compliance with at least a pump flow constraint imposed by the seismic vibrator device. In another embodiment, a sweep generator determines a sweep for achieving a desired target output spectrum by a given seismic vibrator device in compliance with all of multiple operational constraints of the seismic vibrator device, such as both mass displacement and pump flow constraints. Environmental constraints may also be accounted for in certain embodiments. | 12-03-2015 |
| 20160146954 | SYSTEMS AND METHODS FOR GENERATING COMPOSITE NON-LINEAR SWEEPS ADAPTED TO VIBRATOR CONSTRAINTS - In accordance with some embodiments of the present disclosure, a method for generating composite non-linear sweeps adapted to vibrator constraints includes determining a target amplitude function, determining a constraint set including a constraint, selecting a scaling constant, calculating a low-frequency non-linear sweep based on the constraint set and the scaling constant, calculating a high-frequency non-linear sweep based on the constraint set, the scaling constant, and the low-frequency non-linear sweep, and calculating a composite non-linear sweep by combining the low-frequency non-linear sweep and the high-frequency non-linear sweep. | 05-26-2016 |
| 367190000 | With feedback control | 9 |
| 20100172217 | System of Methods and Apparati for Handling and Modifying Information Energy and Matter by Formative Resonance - This invention relates to an improvement in systems, methods and apparati for handling and processing information, energy and matter by making use of potentials of new technologies, science and industrial art, principally in cymatics, quantum field theory and psychoenergetic science. It comprises a system of methods and apparati for handling information, energy and material using multimodal cymatic (standing wave patterning, whether stationary or moving) generation, and manipulation, principally of material and energy in vorticoid including concatenated and grouped vorticoid forms, to concentrate, cleanse, separate, transform, produce etc., materials and energy, including without limitation the production of clean water and manufactures materials, the production of net usable energy by effects such as Schauberger and vacuum potential-related, the collection, processing and communication of information by nonlocal quantum coherence (entrainment) of dynamic systems, initially cymatic, viz., vorticoid, the similar transport of lower-dimensionality material patterns, i.e., materials, also to facilitate transport of living organisms, and the tuning of higher-dimensional energy forms, i.e., formative fields, for applications such as healing; a means of fine-tune controlling such systems directly by means of psychoenergetic operator interaction and indirectly by means of conditioned space technologies and vibratory enhancing technologies such as “scalar” treated materials and systems; and by other means described as “gauge-symmetry”-level raising, here, e.g., Bearden; and their combination; and a means of facilitating learning to generate Tiller-effect spacial conditioning (higher gauge symmetry) enhancement using motivated feedback in utilising these systems with spacial conditioning technology assist. | 07-08-2010 |
| 20110164470 | Apparatus for Generating a Seismic Source Signal - A seismic source signal generator having feed-forward control uses pressure, current, and/or valve position sensors to detect system component parameters. Initial and operating parameters are processed during source operation to remove, partially or wholly, harmonic distortions from the seismic source signal. | 07-07-2011 |
| 20130163387 | Method of Controlled Pulse Driving of a Stacked PZT Bender Bar for Dipole Acoustic Radiation - A bender bar is presented. The bender bar includes at least two pairs of piezoelectric elements arranged on an inert element to adjust the response frequency of the bender bar. In some embodiments, the piezoelectric elements can be stacked on the inert element. In some embodiments, the piezoelectric elements are symmetrically arranged with respect to the bender bar such that a gap is formed between piezoelectric elements arranged on the inert element. | 06-27-2013 |
| 20130235701 | METHOD TO DELEGATE ACTIVATION AUTHORITY TO SEISMIC SOURCES DURING OPERATIONS - A seismic survey method including determining an expected time when an actuation step will be performed by a seismic source device, transmitting a signal from the seismic source device to a source control system thereby alerting the source control system of the expected time when the actuation step will be performed by the seismic source device; and in response to the signal from the seismic source device, providing a communication from the source control system to the seismic source device. | 09-12-2013 |
| 20130286791 | DISCRETE ELECTRIC SEISMIC SOURCE UNIT - The invention is an electric sweep type seismic vibrator source of the type used in seismic prospecting for hydrocarbons. The source uses an engine and generator combination to create electric power for all systems on the source such as driving a frame of linear electric motors that direct a rod or piston to contact the ground in a recurring fashion along with driving the source from location to location through a survey area. The seismic source includes systems for driving the acoustic energy systems using electric energy concurrently from both the generator and an electric energy accumulator such as a capacitor or battery, systems for adjusting the weight on the acoustic energy delivery system by raising and lowering wheels individually and an active energy isolation to isolate the chocks and impulses of the acoustic energy delivery system from the remainder of the seismic source. | 10-31-2013 |
| 20140064036 | ACOUSTIC WAVE GENERATOR EMPLOYING FLUID INJECTOR - To reproduce sound in an extremely compact size, fluid injectors are used that can generate fluid flow sufficient to create a desired acoustic pressure wave, but which fluid flow operates in a manner that is decoupled from the desired acoustic pressure wave. Fluid flow within the fluid injectors needed to generate the desired acoustic pressure wave need not be directly proportional to the frequencies of the desired acoustic pressure wave. The fluid injector has a control input capable of altering fluid flow relative to a received control signal, which is generated by a controller in response to an electrical signal. The fluid injector produces fluid flow outward and inward in response to the control signal, thereby creating an acoustic wave proportional to the electrical signal. The devices herein may employ valves or not. Synthetic jets may also be used. | 03-06-2014 |
| 20140140179 | INFRASOUND GENERATING DEVICE BASED ON A DISPLACEMENT-FEEDBACK TYPE VIBRATION EXCITER - The infrasound generating device based on a displacement-feedback type vibration exciter comprises a displacement-feedback type vibration exciter system, an infrasound generating chamber ( | 05-22-2014 |
| 20160124097 | SEISMIC SHAKER - A seismic shaker for exercising an excitation force on the ground has a base plate and a reaction mass connected to the base plate via a resilient structure and an actuator parallel thereto. A first comparison unit sends a difference signal which is the difference between a displacement measured by a displacement sensor and a set value of the displacement. A control unit calculates a correction value as a function of this difference signal, and sends it to a second comparison unit, which adds the correction value to a value of the excitation force to be exerted set in the second comparison unit. This second comparison unit is connected to a controller unit which controls the actuator. At Low frequency this position control will track the ground force through the position set-point. The position feedback loop will be able to suppress the interfering force of the spring and any hysteresis | 05-05-2016 |
| 20160146955 | SEISMIC SWEEP USING ODD ORDER HARMONICS - Sweep signals for vibrators used to generate seismic signals for seismic surveys are described. By selecting a certain amount of one or more odd order harmonic components to be included in the sweep signal, the amplitude of the seismic signal generated by the vibrator can be increased. | 05-26-2016 |
