gradiometer

(redirected from gradiometers)
Also found in: Encyclopedia.

gradiometer

(ˌɡrædɪˈɒmɪtə)
n
1. (General Physics) physics an instrument for measuring the gradient of a magnetic field
2. (Surveying) surveying an instrument used to ensure that a long gradient remains constant
References in periodicals archive ?
satellites & probes / payloads / instruments / other instruments / gradiometers plasma detectors
The MEG system has 306 sensors grouped in triplets consisting of 2 planar gradiometers and 1 magnetometer distributed at 102 locations.
Workshop sessions were also included to better understand some of the widely used survey equipments such as underwater gyros, magnetometers & gradiometers, side scan sonars & sub bottom profilers, tide gauges, wave sensors and meteorological & water quality sensors.
This volume explores a wide array of geoinformatic techniques utilized by archaeologists working in the Caribbean, including geographic information systems (GIS) and global positioning systems (GPS), as well as aerial photography, cartography, and geophysical surveys that employ magnetometers, gradiometers, resistivity meters, and soil thermography.
The Berlin group measured MCGs using 49 non-contact SQUID gradiometers, obtaining recordings of MCGs in cardiac patients and normal subjects.
With ground-penetrating radar and other so-called geophysical technologies, such as gradiometers that can detect small variations within a magnetic field, researchers can limit their excavations, says Armin Schmidt of the University of Bradford in England.
Other well-known technologies under consideration are magnetometers and gradiometers, which discover hidden devices by seeking telltale magnetic anomalies.
Current gravimeters have been used in the air with some success in defining features with a scale of 10 km or greater, but the next generation of airborne gravity instruments will be gradiometers targeting features 200 to 500 m beneath the ground surface with density contrasts about 300 kg/m3 and smaller than 1 km across.
The pickup coils are configured as second-order gradiometers.
Using superconductivity, the devices could be built as gradiometers able to measure magnetic gradients in particular orientations and provide vectors of the magnetic dipoles.
Schonstedt has shipped thousands of magnetic locators - known technically as gradiometers or magnetometers - to the military and its contractors, as well as non-governmental organizations, for use in countries like Iraq, Afghanistan, Kosovo, Lebanon, South Korea, Russia and Vietnam.
MEG systems by Elekta Oy (Helsinki, Finland) comprise both magnetometers and gradiometers and they employ spatial filtering techniques such as Signal Space Projection (SSP) and Signal Space Separation (SSS) and its temporal extension (tSSS) implemented in the Elekta Neuromag[R] MaxFilter[TM] software [13].