|
Match
|
Document |
Document Title |
|
|
7460439 |
Ultrasonic transducer for ranging measurement with high directionality using parametric transmitting array in air and a method for manufacturing same
A multiple resonances type ultrasonic transducer for a ranging measurement with high directionality using a parametric transmitting array in air, includes an ultrasonic actuator unit formed with a...
|
|
|
7319639 |
Acoustic concealed item detector
The present invention is directed towards an acoustic concealed item detector and related methods for detection using acoustics. In an illustrative embodiment, a multi-frequency ultrasonic wave...
|
|
|
7289391 |
Narrowband phase difference measurement technique for sonar applications
The present invention is directed to a sonar system that includes a transmitter configured to direct multi-frequency transmit signals into a propagation channel. Each multi-frequency transmit...
|
|
|
7196970 |
Ultrasonic ranging system and method thereof in air by using parametric array
An ultrasonic ranging method for measuring a distance to an object in an air includes the steps of generating a first and a second primary ultrasonic waves having a frequency f 1 and f 2 ,...
|
|
|
7146011 |
Steering of directional sound beams
Apparatus is disclosed for steering a directional audio beam that is self-demodulated from an ultrasound carrier. The apparatus includes means for modulating a carrier signal with an audio signal...
|
|
|
6704247 |
High efficiency parametric sonar
A parametric sonar for use in a liquid medium includes a first signal generator which transmits a first acoustic signal and a second signal generator transmitting a second acoustic signal which...
|
|
|
6661739 |
Filigree electrode pattern apparatus for steering parametric mode acoustic beams
A piezoelectric embedded monolithic active surface for transmitting a directed acoustic beam comprising a monolithic active surface, a plurality of piezoelectric elements embedded on the surface...
|
|
|
6590832 |
Vibrator and method of exploring a material medium by means of very low-frequency elastic vibrations
Vibrator comprising a single vibration generator coupled with the medium by a coupling element and means for controlling the generator, suited to apply thereto, on each emission, a single pilot...
|
|
|
5903516 |
Acoustic force generator for detection, imaging and information transmission using the beat signal of multiple intersecting sonic beams
A force is produced within an object by two intersecting ultrasonic beams. The frequency of this force is equal to the beat frequency of the two intersecting beams when their frequencies are made...
|
|
|
5790474 |
Active sonar for under-ice conditions
Active sonar apparatus, especially adapted for detecting submarine targets under ice, includes means for providing first and second pulsed, underwater acoustic signals respectfully having a high...
|
|
|
5719823 |
Ground penetrating sonar
A ground-penetrating sonar echo locating device uses acoustic energy to locate underground structures, such as piping. A transducer, driven with two frequencies whose amplitudes would be rapidly...
|
|
|
5305286 |
Bistatic/monostatic sonar fence
A sonar system has at least two separated bottom-mounted acoustic modules, each module including a projector for generating horizontal sound beam, a vertical line receive array for monostatic and...
|
|
|
5237541 |
Platform carried bistatic sonar
A platform borne sonar system for the detection of targets includes a transmitting projector suspended beneath the water surface from a platform for generating a virtual parametric acoustic array...
|
|
|
5235558 |
Choke point bistatic sonar
A sonar system for use in a water body includes a projector on the bottom of a water body for generating and transmitting a direct beam of acoustic energy. A receiving array is immersed in the...
|
|
|
4924449 |
Acoustic sub-surface interrogator
A positionable transducer array on a stationary platform proximate a layered site on the seabed coherently insonifies locations at the site with a signal having a selected power, resultant center...
|
|
|
4872146 |
Method and apparatus for simulating phase coherent signal reflections in media containing randomly distributed targets
A method of simulating phase coherent signal reflections in media containing randomly distributed targets capable of scattering signals transmitted through the media, wherein the energy of signals...
|
|
|
4712201 |
Acoustic self-guidance systems for submarine vehicles
A self-guidance system for submarine vehicles containing a parametric sonar including preformed channel, transmission device and, in each channel, two beams at the primary frequencies formed...
|
|
|
4703462 |
Virtually steerable parametric acoustic array
The invention concerns an application of linear system parameter estimation techniques to finite amplitude sonar devices, to extract fine grained angular position information about echo sources....
|
|
|
4697254 |
System and method for measuring ice thickness
Sonar ice thickness measurement comprises transmitting an AM and subsequent CW sonic radiant energy signals from the water toward the sonic signal reflecting ice cap. Reflection of the CW signal...
|
|
|
4603408 |
Synthesis of arbitrary broadband signals for a parametric array
A method for synthesizing arbitrary broadband signals for a parametric ar which computes the input waveform needed to a parametric array source to obtain a received signal of a prescribed waveform....
|
|
|
4596007 |
Interferometric sonar in non-linear acoustics
An interferometric sonar in non-linear acoustics for high-resolution observations of objects located in the vicinity of the sea floor includes two end transducers for simultaneous transmission at...
|
|
|
4493064 |
Sonar System
A sonar system comprises a vehicle (1) capable of moving over the bottom of an extent of water, with an emitter of acoustic pulses and a receiver of acoustic energy mounted on said vehicle. Signal...
|
|
|
4471473 |
Direction finding circuit arrangement
A sonic energy scanning apparatus in which two directional primary sonic energy beams at two different frequencies are radiated into a medium capable of producing nonlinear acoustic effects to...
|
|
|
4460066 |
Crime prevention apparatus for elevators
A crime prevention apparatus for controlling the operation of an elevator which comprises a night detector for detecting night, a passenger detector for detecting the presence of only one adult...
|
|
|
4400804 |
Driver for high power sonar systems
A high power sonar pulse generator driven by a low power electrical motor erein a flywheel, placed in the mechanical system, connects the small motor and large generator. Since the large power...
|
|
|
4373143 |
Parametric dual mode transducer
A dual mode transducer has the capability of high power active transmission t two separate frequencies more than two octaves apart with broad bandwidth at both frequencies. The low frequency...
|
|
|
4349898 |
Sonic weapon system
A system for transmitting a parametrically pumped sonic signal through a transmission medium to a remote location is disclosed. The preferred system, which is particularly intended for use as a...
|
|
|
4320474 |
Saturation limited parametric sonar source
A selected increase in the farfield amplitude of the difference frequency am of saturation limited parametric sonar sources is obtained by an array of saturation limited parametric sources having a...
|
|
|
4308599 |
Echo sounder transmitting radiant energy at two frequencies
An echo sounder including a unit for transmitting, into a medium, acoustic signals at two slightly differing high frequencies and in the form of pulses, resulting in the creation of an acoustic...
|
|
|
4296482 |
Parametric array Doppler sonar apparatus
Parametric array Doppler sonar apparatus includes an acoustic lens containing a flat disk-like central portion and an annular outer portion serving as a convergent lens. Multiple transducers are...
|
|
|
4270191 |
Doppler current meter for use at great depths
The invention relates to a device for measuring aquatic currents, placed on a moving boat comprising a Doppler effect sonar. The device comprises two sets of transducers and transmitting and...
|
|
|
4265122 |
Nondestructive testing apparatus and method utilizing time-domain ramp signals
Disclosed is an apparatus and method for nondestructive testing of structures where the apparatus includes a transducer for generating an ultrasonic acoustic signal, a nonlinear medium for...
|
|
|
4255797 |
Sonic attenuation system
A beam of sound, of sufficient amplitude for inducing a finite amplitude effect in water, is directed into a field of sound for interaction therewith to produce intermodulation products. Energy is...
|
|
|
4253166 |
Target location systems
A target location system comprising a signal transmitter including a pair of signal transmitter transducers arranged in spaced apart relationship and means for driving the transducers with...
|
|
|
4216537 |
Sonar for the topographic representation of a submerged surface and underlying strata
This sonar system, placed on a vehicle such as a ship or a submarine, comprises transducer means for transmitting and receiving acoustic waves at two different frequencies, said reception means...
|
|
|
4213195 |
Sonic direction system
A system for the determination of the direction of a source of sound in water utilizing the finite amplitude effect. A narrow beam of sonic energy at a frequency higher than that of the source is...
|
|
|
4207620 |
Oceanographic mapping system
An underwater mapping system in which a swath of terrain, much wider than a sonar beam width, is observed by means of a sonar beam scanned in the cross track plane of a ship. Filtering and...
|
|
|
4190818 |
Digital beamsteering for a parametric scanning sonar system
Digital beamsteering for a parametric scanning sonar steers a nonlinear, ulated signal of a single high frequency by appropriately delaying and/or varying the phase of the signal as it enters each...
|
|
|
4135142 |
Non-linear acoustic transducer
An improvement for a transducer provides an improved operational charactetic for the transmission and reception of acoustic energy in a liquid medium. A rigid shell having an open end and a closed...
|
|
|
4075599 |
Undersea geophysical exploration
Process and apparatus for underwater geophysical exploration to prepare surveys of undersea floor areas having solid minerals, such as manganese nodules, dispersed at sea floor surfaces transmits...
|
|
|
4050056 |
Electroacoustic transducer design for eliminating phantom target errors in sound ranging systems
A baffle structure for use with an electroacoustic transducer in a sound ranging system eliminates secondary reflections between the transducer and target, thus eliminating false target errors that...
|
|
|
4012950 |
Method of and apparatus for acoustic imaging
A method of and apparatus for imaging objects utilizing acoustic waves wherein an acoustic beam or beams are generated at one or more frequencies and are focused into proximity with the object to...
|
|
|
4007437 |
Acoustic foghorn for directional signaling
A method of creating a highly directional acoustic beam that can be swept er the water near the entrance of a harbor or channel location. The information provided to a boat operator as a result of...
|
|
|
3974476 |
Highly-directional acoustic source for use in borehole surveys
A highly directional acoustic source for use in a well logging system wherein a fluid-filled tube is provided with a transducer at one end and an acoustic reflector at the other end to reflect the...
|
|
|
3964013 |
Cavitating parametric underwater acoustic source
A cavitating parametric underwater acoustic source for generating efficiey acoustic energy at low and medium frequencies. The source comprises a plurality of electro-acoustic transducer elements...
|
|
|
3924259 |
Array of multicellular transducers
A sonar transducer array in which each transducer is formed of multiple contiguous cells formed by dividing a regular polygonal shaped transducer into triangular sectors or cells. Such...
|
|
|
3886487 |
Anti-collision sonar system
A sonar system particularly adapted for navigating a ship in shallow waters employing a forwardly directed narrow sonar beam emanating from a projector assembly carried by the ship. The projector...
|
|
|
3882444 |
Steerable parametric conversion array
A system for detecting and isolating incoming acoustic waves is disclosed, the system including means for transmitting a random noise signal which will intersect the incoming waves. Cross...
|
|
|
3870988 |
HYBRID CARRIER BEAM SONAR
An underwater detection and identification method and apparatus utilizing the principle of parametric cross-modulation of ultrasonic frequencies within a non-linear propagation medium for obtaining...
|
|
|
3866159 |
CARRIER BEAM SENSOR
A system for detecting incoming, low-frequency acoustic waves is disclosed, the system including means for randomly generating and transmitting a series of discrete frequency signals into a fluid...
|