Matches 301 - 350 out of 376 < 1 2 3 4 5 6 7 8 >
Match Document Document Title
3740707 FAR FIELD SIGNAL SIMULATION UTILIZING CYLINDRICAL ARRAYS  
A performance monitoring test set having a cylindrical near field multi-se transducer array which simulates far field conditions. The multi-stave array is housed in a cylindrical test tank with...
3731273 POSITION LOCATING SYSTEMS  
Position location and plotting is mechanized and accurately accomplished in a system employing a movable transmitter of acoustic signals and at least two acoustic receivers whose position is fixed....
3700780 DUAL DELAYED SEQUENCE GENERATOR WITH READ ONLY MEMORY CONTROL FOR 256 OUTPUT TRIPLES FOR PLANE AND SPHERICAL WAVE-FRONT SIMULATIONS  
A dual delayed sequence digital generator having a plurality of shift reger modules connected to generate linear sequences, each module stage having an output to a solid state switch under the...
3665379 PULSE-SOUND TRANSMITTING TUBE FOR CALIBRATING UNDERWATER SOUND TRANSDUCERS  
A method and apparatus for calibrating sound transducers wherein the transducer to be calibrated is mounted so as to radiate sound into a water filled, thick walled, metal tube sealed at the...
3659255 HYDROPHONE CALIBRATOR  
A compact, complete, portable hydrophone calibrator or tester suitable for evaluating or calibrating a hydrophone and particularly for checking the sensitivity of a hydrophone. In the embodiment...
3656096 DIGITAL DELAY TIME COMPRESSION CIRCUIT  
A digital delay time compression circuit (DELTIC) having a shift register produce a 512 bit delay with an input from an AND-OR gating circuit to sample hydrophone data and recirculate this data in...
3648513 SONIC METHOD AND MEANS FOR DETERMINATION OF SOLUTION CONCENTRATIONS  
This invention relates to a method of determining the chemical concentration of a solution. More particularly, the invention relates to determining the chemical concentration of a solution by...
3637038 METHOD FOR RETRIEVING A LOST TOOL IN A BOREHOLE USING AN ACOUSTICAL WELL SOUNDER  
A method is disclosed using an overshot retrieving device which is lowered into a borehole by means of tubing until the overshot arrives at a lost tool. An attempt is made to engage the tool with...
3622961 AUTOMATIC SONAR-BEAM-PATTERN PLOT  
Means for making a polar plot of the beam pattern of a sonar transducer ay. A sonar transmitting transducer is suspended from a long boom aboard a ship. A synchro transmitter is attached to the...
3555165 ACOUSTIC TARGET SIMULATOR  
Apparatus for simulating acoustic echoes of sonar pulses from any selected target configuration including a hydrophone whose output signal is fed to a signal processor for modifying a received...
3518675 APPROXIMATING THE NETWORKS FOR A BEAMFORMING TRANSDUCER ARRAY  
3500301 SONIC DETECTION APPARATUS  
3496525 EXPENDABLE TRANSMISSION LOSS HYDROPHONE SYSTEM  
3471858 DYNAMIC DOPPLER SIMULATOR  
3458855 UNDERWATER ACOUSTIC GENERATOR WITH VARIABLE RESONANT FREQUENCY  
3447627 UNDERWATER SOUND REFLECTOR APPARATUS  
3436720 SONAR APPARATUS FOR MEASURING UNDERGROUND CAVERNS  
3435408 MULTIMODE HYDROPHONE TRANSDUCER SIMULATOR  
3413595 Ultrasonic apparatus for checking processes in liquid media  
3410363 Method and apparatus for testing the wave-reflecting characteristics of a chamber  
3407398 Liquid presence detector  
3403247 Analog beam pattern digital simulator  
3393400 Calibration method using transducer array with constant pressure plane wave near-field  
3375487 Radiated power level meter  
3373842 Underwater anechoic chamber with screen of rubberlike tubes  
3365667 Shielded chamber for measuring electromagnetic or acoustic waves  
3364461 Transducer array with constant pressure, plane wave near-field  
3363045 Sonar target simulator  
3352144 Hydrophone dynamic calibration system  
3351856 Apparatus for determining total amplitude and total number of oscillations of waves  
3351898 Method and apparatus for monitoring the condition of a marine seismic detector cable  
3349608 Ultrasonic thickness comparator device  
3343126 Acoustic device for detecting moving particles in a fluid  
3334303 Delayed pulse generating system  
3327071 Method of and apparatus for computation particularly suited for microphone absolute calibration  
3303688 Transducer test equipment and method  
3292139 Sonar performance computer  
3281543 Calibrator for microphones  
3277478 Transponder requiring delay plus short time differentials  
3266721 Sonar slide rule  
3250923 Instrument for providing pulses at desired intervals  
3240049 Measurement of spherical standing waves  
3224246 Low frequency hydrophone calibration  
3223965 Shallow water depth alarm  
3214727 Method of range detection by use of sound  
3202968 Signal monitoring instrument  
3184959 Velocity of sound meter  
3181138 Electrical sound simulator  
3175638 Well logger  
3167150 Radiation level indicator for sonar projectors  
Matches 301 - 350 out of 376 < 1 2 3 4 5 6 7 8 >