Results 231 to 240 of about 49,317 (287)
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Seismic response of fiber optic seismic sensors
The Journal of the Acoustical Society of America, 2017Fiber-optic seismic sensors (FOSS) consist of an optical fiber connected to an optical interrogator, which is electro-optic instrumentation that injects pulses of coherent light into the fiber and receives and demodulates the returned signals. The optical fiber is usually contained within a protective cable.
R D. Costley +5 more
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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
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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
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Detecting the Seismic Event by the Electrodynamic Seismic Sensor
2020 XI International Conference on Electrical Power Drive Systems (ICEPDS), 2020Electrodynamic seismic sensors with two mechanic oscillation circuits could detect a ground vibration of two different objects with two different frequencies, for example, a human and a car. They don't need external power for their performance and have small overall dimensions, that's why they are attractive to use them in portable security or monitor ...
Nikolay Gavryushin +2 more
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Frequency-Selective Seismic Sensor
IEEE Transactions on Instrumentation and Measurement, 2012Recent trends in earthquake monitoring and prediction have focused on the monitoring of seismic frequencies that are very close to the natural frequencies of buildings and other structures, such as bridges. This paper introduces a new type of seismic sensor that is highly sensitive to vibrations at one specific frequency.
Ezzat G. Bakhoum, Marvin H. M. Cheng
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Human Activities Classification Using Biaxial Seismic Sensors
IEEE Sensors Letters, 2020In this letter, we propose a method for passive human activity classification exploiting ground vibrations observed by a biaxial geophone. The solution is grounded on the idea that some activities can be better analyzed by the horizontal channel (bicycle and car) and others by the vertical one (walk and run).
Lorenzo Pucci +3 more
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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
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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
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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 ...
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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 ...
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An inkjet printed seismic sensor
2015 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings, 2015In this paper an inkjet printed sensor in the mesoscale is presented with the aim to investigate its behavior as accelerometer in the low frequency domain typical of inertial stimuli coming from human caused and seismic phenomena.
ANDO', Bruno +4 more
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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
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Seismic Instruments, 2011
The problems related to design of a portable seismic sensor working in a frequency range of 0.01–40 Hz are considered. Its main parts (pendulum, capacitive displacement transducer, magnetoelectric converter), structural diagram, and amplitude-frequency characteristic are described.
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The problems related to design of a portable seismic sensor working in a frequency range of 0.01–40 Hz are considered. Its main parts (pendulum, capacitive displacement transducer, magnetoelectric converter), structural diagram, and amplitude-frequency characteristic are described.
openaire +1 more source