Matches 151 - 177 out of 177 < 1 2 3 4
Match Document Document Title
3829768 SUPERCONDUCTING GRADIOMETER FOR MEASURING FIRST AND SECOND DERIVATIVES OF A MAGNETIC FIELD  
The first and second derivatives of a magnetic field are measured by two rs of spaced superconducting sensing coils which are aligned along a common axis with the individual coils of each pair...
3808519 METHOD AND DEVICE FOR DETERMINING THE DEPTH OF A MAGNETIC ANOMALY  
This invention is concerned with a method and a device for determining the depth of a magnetic anomaly at least approximately comparable with a horizontal dipole. A particular use of the invention...
3737842 FEATURE RECOGNITION TECHNIQUES  
A feature recognition system for extracting transient signal information m a signal-like noise background by separating a time domain signal into a plurality of frequency-time domain signals by...
3644825 MAGNETIC DETECTION SYSTEM FOR DETECTING MOVEMENT OF AN OBJECT UTILIZING SIGNALS DERIVED FROM TWO ORTHOGONAL PICKUP COILS  
A pair of magnetic field sensors are disposed perpendicular to one another for sensing, at a single location, different directional components of a magnetic field. The output signals from the...
3621380 METHOD AND APPARATUS FOR SEISMIC-MAGNETIC PROSPECTING  
Seismic disturbances are impinged upon underground magnetic bodies to cause time varying changes in the magnetic field of the bodies. These time varying changes are sensed to provide indications of...
3568048 THREE COIL SYSTEM FOR GEOPHYSICAL PROSPECTING UTILIZING MAGNETIC TIME TRANSIENTS  
A method and apparatus for detecting geophysical anomalies by measuring the naturally occurring audio frequency transient magnetic fields (AFMAG fields) in two planes comprising utilizing three...
3546580 MAGNETIC FIELD VARIOMETER USING A LOW NOISE AMPLIFIER AND A COIL-CORE ARRANGEMENT OF MINIMUM WEIGHT AND MAXIMUM SENSITIVITY  
3514693 METHOD OF SUBMARINE MAGNETOTELLURIC SURVEYING AND APPARATUS FOR CARRYING OUT SAME  
3490032 METHOD AND APPARATUS UTILIZING A PAIR OF SPACED MAGNETOMETERS FOR MAKING MAGNETIC SURVEYS  
3412371 Detection system  
3398360 Magnetic body detector sensitive only to magnetic field variations within a predetermined range  
3392327 Detection of electroseimic signals employing salt domes  
3389331 Device for electromagnetic exploration with the help of a natural field  
3324385 Method and apparatus including movable armature means and transient electromagnetic wave detecting means for locating anomalous bodies  
3281660 Locator for magnetic and conducting materials including means for adjusting the relative positions of a pair of sensing coils  
3263161 Method for determining depth and falloff rate of subterranean magnetic disturbances utilizing a plurality of magnetometers  
3210652 Method of geophysical prospecting by comparing the steady state magnetic field measured due to current flow through a medium with the transient magnetic field measured after termination of the current flow  
3188560 Survey apparatus having synchronously rotatable means for determining and recording minute deviations in the earth's total magnetic field  
3149278 Method of geophysical prospecting by measuring the earth's magnetic time transients simultaneously in two different directions  
3085197 Inductor survey apparatus and method for determining presence of oil bearing substrata  
2996657 Gyromagnetic resonance magnetometer and gradiometer apparatus and method  
2990513 Magnetometer  
2931974 Method of geophysical prospecting  
2909725 Magnetoabsorption method and apparatus  
2902636 Recording system  
2850689 Apparatus for producing a servo system test signal  
3559046 Title is not available  
Matches 151 - 177 out of 177 < 1 2 3 4