Results 211 to 220 of about 4,166 (255)
Some of the next articles are maybe not open access.
The Journal of the Acoustical Society of America, 1983
A seismic sensor is disclosed which essentially consists of a central annular member having an inner conductive periphery. The annular member is coaxially positioned around a center post located in a housing. The center post has four extending surface slots into which are inserted tines or upstanding flanges associated with first and second contact ...
openaire +1 more source
A seismic sensor is disclosed which essentially consists of a central annular member having an inner conductive periphery. The annular member is coaxially positioned around a center post located in a housing. The center post has four extending surface slots into which are inserted tines or upstanding flanges associated with first and second contact ...
openaire +1 more source
Laser interferometry based seismic sensor
SPIE Proceedings, 2003Laser interferometry is one of the most sensitive and versatile techniques for small relative displacements measurement. For these reasons it is used or it is being introduced in many different fields of research. One of its possible applications is seismic activity monitoring, obtained by fixing the mirrors of an interferometer to the ground. In order
BARONE, Fabrizio +3 more
openaire +2 more sources
A Seismic Sensor Based on IPMC Combined With Ferrofluids
IEEE Transactions on Instrumentation and Measurement, 2012In this paper, a seismic sensor based on the combination of ionic polymer metal composite (IPMC) and ferrofluids is presented. The device consists of a vial, filled with ferrofluid, housing an IPMC cantilever beam sensor. Considering that the behavior (e.g., frequency response) of a beam immersed in a fluid changes with the fluid density, in this paper,
ANDO', Bruno +5 more
openaire +2 more sources
The Journal of the Acoustical Society of America, 1986
A hydrophone streamer that includes several arrays of optical fiber pressure sensors. Each array consists of at least three sensors symmetrically disposed around the inside of the streamer skin to form a vertically-disposed array. Each sensor modulates a coherent light beam in accordance with the instantaneous ambient water pressure. The output signals
openaire +1 more source
A hydrophone streamer that includes several arrays of optical fiber pressure sensors. Each array consists of at least three sensors symmetrically disposed around the inside of the streamer skin to form a vertically-disposed array. Each sensor modulates a coherent light beam in accordance with the instantaneous ambient water pressure. The output signals
openaire +1 more source
SPIE Proceedings, 1988
A compact seismic sensor has been fabricated by supporting a seismic mass between two fiber-wrapped rubber mandrels which form the two arms of a Michelson interferometer. This sensor has a sensitivity of 104 raft below resonance and 3500 rad/gm above resonance, is easy to fabricate, easy to modifiy for other applications, uses less than fifteen meters ...
D. L. Gardner, S. L. Garrett
openaire +1 more source
A compact seismic sensor has been fabricated by supporting a seismic mass between two fiber-wrapped rubber mandrels which form the two arms of a Michelson interferometer. This sensor has a sensitivity of 104 raft below resonance and 3500 rad/gm above resonance, is easy to fabricate, easy to modifiy for other applications, uses less than fifteen meters ...
D. L. Gardner, S. L. Garrett
openaire +1 more source
The Journal of the Acoustical Society of America, 1986
A vibration sensor is constructed by providing two preferably matched coils of fiber-optic material. When the sensor experiences vibration, a differential pressure is exerted on the two fiber coils. The differential pressure results in a variation in the relative optical path lengths between the two fibers so that light beams transmitted through the ...
George W. Finch, Eric Udd
openaire +1 more source
A vibration sensor is constructed by providing two preferably matched coils of fiber-optic material. When the sensor experiences vibration, a differential pressure is exerted on the two fiber coils. The differential pressure results in a variation in the relative optical path lengths between the two fibers so that light beams transmitted through the ...
George W. Finch, Eric Udd
openaire +1 more source
Seismic receivers with quartz sensors
Seismic Instruments, 2009The results of theoretical and experimental studies of the basic characteristics of seismic receivers with quartz sensors are presented: the working frequency band is 0.1–30 Hz, the dynamic range is 120 dB, and the temperature coefficient of pendulum displacement is 0.2 μm/°C.
E. Koridalin, V. I. Osika
openaire +1 more source
The Leading Edge, 1999
A simple design has served geophysicists well for many decades. It is, of course, the geophone—essentially a coil suspended in a magnetic field. This simple arrangement can detect vibrations of the earth’s surface when explosive or vibratory sources send energy into the ground.
openaire +1 more source
A simple design has served geophysicists well for many decades. It is, of course, the geophone—essentially a coil suspended in a magnetic field. This simple arrangement can detect vibrations of the earth’s surface when explosive or vibratory sources send energy into the ground.
openaire +1 more source