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| Number | Title | Issue Date |
| 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 regularly mixing array of first unit actuators having a resonance fre... | 12/02/2008 |
| 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 generator generates in a gaseous medium at least first and second ultras... | 01/15/2008 |
| 7315241 | Enhanced perception lighting The present invention relates to an enhanced perception lighting (EPL) system for providing enhanced perception of a user's physical environment. The EPL system comprises a sensor module for detecting and sampling a physical aspect from at least one point in a physi... | 01/01/2008 |
| 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 signal includes a first frequency and a second frequency. A receiver is tu... | 10/30/2007 |
| 7268703 | Methods, systems, and devices for cartographic alerts Systems, devices, and methods are provided for marine navigation and course calculation for avoiding preselected conditions. An electronic marine navigation device with marine course calculation capabilities includes a processor connected to a memory that includes c... | 09/11/2007 |
| 7224808 | Dynamic carrier system for parametric arrays A system configured to dynamically adjust the ultrasonic carrier level in a parametric array system in response to changing source signal input levels, and which employs a look-ahead delay strategy to enable optimal modulation of the carrier wave to eliminate consta... | 05/29/2007 |
| 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 f1 and f2, respectively, transmitting the first and the second primar... | 03/27/2007 |
| 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 and means for adjusting the amplitude and phase of at least one of the... | 12/05/2006 |
| 7132928 | Threat detection system interface A threat detection system interface that provides translates threat diction information into a tactile signal for a user to indicate the direction and distance of an identified threat relative to an object. The threat detection system interface having applications f... | 11/07/2006 |
| 7095359 | Method of observing sea ice An ice thickness/drifting velocity observation of sea ice by using an ice thickness measurement sonar and a current meter moored into the sea and a sea ice observation by a high-resolution airborne SAR are synchronously performed, a correlation between a draft profi... | 08/22/2006 |
| 7054229 | Multi-line towed acoustic array shape measurement unit An acoustic array comprising a plurality of nodes attached to two or more lines. Some or all of the nodes include an emitting transducer and a receiving hydrophone, and the balance include only a receiving hydrophone. Each emitting transducer has associated electron... | 05/30/2006 |
| 6940599 | Envelope functions for modulation spectroscopy A spectrometer and spectrometry method comprising modulating a light source with a carrier waveform multiplied by an envelope function, directing light from the light source through a sample region and to a photodetector, and demodulating current from the photodetec... | 09/06/2005 |
| 6856918 | Method to characterize material using mathematical propagation models and ultrasonic signal The invention is directed to a system and method for detecting defects in a manufactured object. These defects may include flaws, delaminations, voids, fractures, fissures, or cracks, among others. The system utilizes an ultrasound measurement system, a signal analy... | 02/15/2005 |
| 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 interatct to produce a difference frequency signal at an inte... | 03/09/2004 |
| 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 forming an array comprising, a plurality of coupled frequenc... | 12/09/2003 |
| 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 signal obtained by combination of at least two signals of dif... | 07/08/2003 |
| 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 different, or the force may vary as a function of a baseban... | 05/11/1999 |
| 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 frequency, fH, and a low frequency, fL. | 08/04/1998 |
| 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 attenuated in surface or through-the-ground transmission, is... | 02/17/1998 |
| 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 bistatic detection, and a high frequency, upward-directed t... | 04/19/1994 |
| 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 in a water column, forming a beam of acoustic energy. The b... | 08/17/1993 |
| 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 water body outside the direct beam for detecting reflections f... | 08/10/1993 |
| 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 frequency, beamwidth, bandwidth, shape and incident angle. ... | 05/08/1990 |
| 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 directly scattered by the targets is significantly greater... | 10/03/1989 |
| 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 simultaneously. Reception takes place with preformed beams at th... | 12/08/1987 |
| 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. The invention makes use of the fact that the waveform return... | 10/27/1987 |
| 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 from the water-ice interface and reflection from the water-a... | 09/29/1987 |
| 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. The method uses Fourier transform and the inverse transf... | 07/29/1986 |
| 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 two high frequencies F1 and F2 of the... | 06/17/1986 |
| 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 processing and display circuitry (e.g. on board a surface ... | 01/08/1985 |
| 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 produce a third sonic energy beam having a given directional c... | 09/11/1984 |
| 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 passenger in an elevator cage and a start instructing unit fo... | 07/17/1984 |
| 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 output from the pulse generator is required only intermittentl... | 08/23/1983 |
| 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 transducer is a standard double mass loaded longitudinal vibrator... | 02/08/1983 |
| 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 sonic weapon, comprises a sound source; means for separating ... | 09/14/1982 |
| 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 center-to-center spacing selected such that the primary b... | 03/16/1982 |
| 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 signal in the medium at a low frequency equal to the differen... | 12/29/1981 |
| 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 positioned between the lens and the focal plane so as to lau... | 10/20/1981 |
| 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 receiving in the directions D1, D2, D... | 05/26/1981 |
| 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 parametrically generating a special, ramp, waveform, and an acoust... | 05/05/1981 |
