Matches 51 - 100 out of 139 < 1 2 3 >
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5033030 Turbulence velocimetry technique  
A technique for obtaining a class of beam patterns is described which results in eliminating the Doppler spread effect of the mean transverse component of flow of scatterers. This is accomplished...
5010528 Doppler flow velocity distribution measuring apparatus  
An apparatus for measuring the velocity distribution in a fluid by a pulse-Doppler method using an ultrasonic waver or an electromagnetic wave. The observation wave is transmitted to and received...
4914638 Doppler effect speedometer  
A speedometer is provided for determining speed by providing a sound signal at a first frequency, receiving a second signal which is the reflection of the first signal, and determining difference...
4905203 Downhole doppler flowmeter  
A well logging system which monitors the flow rate of a fluid flowing in a borehole traversing an earth formation includes a sonde. A transmitter located in the sonde transmits acoustical waves...
4888744 Pulsed directional doppler frequency domain output circuit  
An electrical circuit to detect frequency domain information from ultrasonic signals that have been doppler shifted by motion of an object in the field of the ultrasonic beam. The circuit receives...
4864307 Method and device for the automatic recognition of targets from "Doppler" e c  
A method and device are provided for the automatic recognition of targets from "Doppler" echoes. The method consists in comparing sequentially the spectra of the "Doppler" signal retransmitted by...
4825422 Method and apparatus for determining the local velocities in a moving fluid by means of doppler ultrasonic echography  
A measure window (29-30, FIG. 2d) is provided in a Doppler velocity profile (FIG. 2c) by deleting an initial section (T 1 ) and a terminal section (T 2 ) of each emission cycle of a train of...
4680739 Process for removing all ambiguity from the measurement by Doppler effect of the speed of a moving target  
The present invention concerns a process for removing all ambiguity from the measurement by the Doppler effect of the speed of a target. It consists in obtaining a signal of Doppler shift relating...
4674069 System for collecting and processing data relating to moving bodies  
An ultrasonic wave signal having its frequency varied continuously is transmitted from an ultrasonic wave transmitter toward a moving body. The wave reflected from the moving body is received by an...
4640292 Extending sample volume in pulsed Doppler systems  
The sampling volume of a pulsed Doppler system is increased to a length greater than that corresponding to one pulse by sampling the reflections of each launched pulse a plurality of successive...
4608568 Speed detecting device employing a Doppler radar  
A speed detecting device comprises a comparing circuit for comparing the amplitude of a Doppler signal with a reference amplitude value, and an excluding circuit for excluding a speed signal...
4598589 Method of CW doppler imaging using variably focused ultrasonic transducer array  
Continuous wave (CW) Doppler imaging employs a linear array of transducer elements with a first plurality of elements functioning as an ultrasonic wave transmitter and a second plurality of...
4573352 Apparatus for measuring wind-speed and/or direction  
Apparatus for measuring windspeed and/or direction with the aid of a sound-wave transmitter (25) and a receiver (25) for receiving reflected sound waves, in which apparatus the sound waves (25a)...
4398274 Within-pulse doppler scanning  
The invention concerns a method and apparatus for detecting Doppler-shifted waveforms in electrical signals. A replica is derived from the waveform prior to Doppler shift and stored in a storage...
4320765 Doppler pseudorandom noise velocimeters  
This invention is directed to improved pseudorandom noise velocimeters and methods therefor, using the Doppler effect, to enable the external measurement of the speed of a moving target within a...
4316269 Own doppler nullifier for sonar system  
There is described a digital sonar receiver having a novel beamformer, own doppler nullifier (O.D.N.), and adaptive time varied gain controller. The beamformer interrogates a multi-element...
4286462 Acoustic detection of wind speed and direction at various altitudes  
An acoustic apparatus for ascertaining wind speed and direction at various altitudes which uses back scattered acoustic waves which are formed from acoustic pulses of predetermined frequencies, are...
4282589 Correlation ranging  
1. In sonic ranging the method which comprises transmitting a first sonic pulse having a predominant frequency in the upper sonic range, transmitting a second sonic pulse after a time delay...
4280365 Ultrasonic Doppler flowmeter with correction for vibratory signals at zero-flow conditions  
An ultrasonic Doppler flowmeter for measuring flowing fluid by reflection of sonic waves from particles in the fluid is provided with a discriminating circuit including a comparator amplifier...
4219887 Bistatic acoustic wind monitor system  
In a Doppler acoustic radar system, bistatic transmitting and receiving antennas are employed in a manner to significantly improve wind measurement performance, and to simplify equipment deployment.
4208731 Method and device for determining the geometrical outline of the underwater part of icebergs and the draught thereof  
This method comprises laying onto the water bottom at least one line of acoustic transducers which are put in energized condition when an iceberg is approaching the location of this line. Acoustic...
4207625 Doppler compensator for heterodyne correlation devices  
2. In a sonar communication system, a transceiver for receiving doppler sals, a local oscillator for producing a first output signal of given frequency, a translation resolver connected to said...
4206639 Doppler acoustic wind sensor  
A system for remote measurement of wind velocity and direction. An acoustic echo transmitter for directing a beam of acoustic energy toward a zone, and a plurality of receivers for receiving...
4183245 Synchronous frequency-to-voltage converter for doppler apparatus  
An ultrasonic Doppler flowmeter is provided with a frequency-to-voltage converter comprising a pair of interconnected filp-flops triggered by the Doppler frequency and a submultiple of the...
4169256 Digitally controlled oscillator  
A digitally controlled oscillator is provided with a memory, storing the half periods T i (i=1, 2, ..., n) of corresponding frequencies f i =1/(2T i ) to be generated, and with a digital feedback...
4143547 Method and apparatus for remote measurement of variation in wind velocity  
An acoustic echo system transmitter and receivers for measuring signal scattering at a zone resulting from wind movement, with the receiver doppler outputs averaged to provide spectra of wind...
4127842 Apparatus for the measurement of flowing media according to the ultrasonic doppler method  
To compensate the Doppler flow measurement for the angle of the ultrasonic beam relative to the flowing medium, the ultrasonic applicator includes a mechanical electrical angular position sensor...
4104912 System for taking current-metering measurements  
A system on board which provides measurement of flow rates of a liquid layers at different depths, the provided results being corrected from error due to the craft movement, said system being...
4099249 Doppler processing method and apparatus  
A method and apparatus for determining the value of a Doppler frequency shift component Δf present in a signal f ± Δf employing a correlation process which utilizes the Mellin transform and is...
4039815 Electro-optical correlator  
A system for electro-optically correlating two signals. A running representation of the amplitude variation of a first signal is observed through a mask representing the amplitude variation of a...
4035760 Object detecting system  
1. A system for detecting the movement of a remote object comprising trantting means for illuminating said remote object with a signal of wave energy, receiving means for recovering an echo...
4007633 Method of determining the physical characteristics of a sea floor  
A hollow, projectile-shaped body containing an acoustical transducer is rased into the sea such that the body descends in free fall until it strikes and penetrates the sea floor, coming to a rest...
3974692 Apparatus for the measurement of the velocity of media flowing in conduits  
An apparatus for the measurement of the velocity of media which flow particularly in conduits, for example, blood in its vessels, through the intermediary of ultrasound according to the Doppler...
3953823 Velocity measurement apparatus using pulsed ultrasonic waves  
A velocity measurement apparatus using pulsed ultrasonic waves which includes a transmitting section which projects pulsed ultrasonic waves to a target at a predetermined position and a receiving...
3940731 Ultrasonic random signal doppler flow measurement system  
A doppler effect flow measurement device using ultrasonic stationary random noise whereby errors and inaccuracies common in existing doppler flow measurement systems are overcome.
3896788 Doppler effect blood flow meter  
A Doppler effect blood flow meter. The flow meter has dual filters having a sharp filtering property capable of dividing ultrasonic waves reflected from blood corpuscles into frequency groups above...
3891960 Doppler sonar system  
A system of acoustic echo ranging for the measurement of bearing and range o an underwater object which is in motion toward or away from the detection system located at a selected position. A...
3889533 Acoustic wind sensor  
A system for remote and continuous measurement of wind velocity and direction. A system being an acoustic echo system or acoustic radar transmitter for directing acoustic energy to a zone, and one...
3888238 Ultrasonic blood vessel imaging system and method  
A transcutaneous system and method for real time imaging of blood vessels. The system includes a transducer having one or more arrays of transducer elements for scanning across or along blood...
3800274 METHODS OF AND DEVICES FOR TRANSMITTING AND RECEIVING AS USED IN NAVIGATION SYSTEMS EMPLOYING THE DOPPLER EFFECT  
The invention relates to an intermittent emission navigation Doppler system designed to determine the speed of a marine vessel by measurement of the Doppler frequency. The method and the device for...
3798590 SIGNAL PROCESSING APPARATUS INCLUDING DOPPLER DISPERSION CORRECTION MEANS  
Apparatus for processing data signals such as sonar return signals of the equency modulated type wherein adverse effects of Doppler dispersion are eliminated which apparatus includes a signal...
3766517 APPARATUS FOR MEASURING THE SPEED OF FLOWING MEDIA  
Apparatus for measuring the speed of media flowing in conduits is specifically concerned with the measuring of the speed of blood flowing in its channels. The apparatus is using ultrasound...
3744015 AUTOMATIC ELECTRONIC FILTER SYSTEM  
A combination bandpass and rejection filter system having a null point at a enter frequency, comprising: A local oscillator for generating any of a range of basic frequencies, a specific one...
3732533 UNDERWATER EXPLOSIVE-ACOUSTIC TRANSDUCER AND SYSTEMS  
An underwater sonic detection system wherein underwater pulses are generated in uniformly spaced selected time sequence to produce a water traversable multi-line spectrum made up of a plurality of...
3732532 ULTRASONIC DOPPLER INSTRUMENT  
Medical ultrasonic doppler instrument in which transmitting and receiving transducers are mounted within a hollow casing on wave-transmission means of solid material cemented within one end of the...
3711822 REFLECTED-BEAM RANGING SYSTEM  
A reflected-beam ranging system in which echo signals are displayed cartographically on the screen of a color picture tube having at least two color components. A circuit means, including frequency...
3707717 BOAT BERTHING MONITOR INCORPORATING SONAR AND DOPPLER RADAR TECHNIQUES  
A system has been provided for generating correction command signals relative to the berthing velocity profile of a vehicle in approach of a docking position. A doppler radar system including a...
3675191 ACOUSTIC SOUNDER  
A method of recording upper atmospheric characteristics which comprises tsmitting in a generally upward direction recurrent pulses of acoustic energy at a selected frequency band of operation at a...
3663932 RECONSTRUCTION OF REFLECTING SURFACE VELOCITY AND DISPLACEMENT FROM DOPPLER SIGNALS  
A method and apparatus for accurate measurement of velocity and displacement of a moving surface by reconstructing the velocity-versus-time and displacement-versus-time functions comprising the...
3617993 CW DOPPLER TRANSCEIVER SYSTEM  
A transceiver system for processing a Doppler signal, utilizing a common transmit-receive transducer driven by a high-frequency RF-square wave amplitude limited signal for eliminating AM...
Matches 51 - 100 out of 139 < 1 2 3 >