Results 191 to 200 of about 3,377 (214)
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SPIE Proceedings, 1987
This paper reviews the present state of seismometry and discusses a seismometer based on fiber-optic technology. In addition, some actual data taken by a portable laboratory-grade fiber-optic seismometer is presented.
P. W. Rodgers +3 more
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This paper reviews the present state of seismometry and discusses a seismometer based on fiber-optic technology. In addition, some actual data taken by a portable laboratory-grade fiber-optic seismometer is presented.
P. W. Rodgers +3 more
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Bulletin of the Seismological Society of America, 1948
Abstract Theory and description are given of sensitive capacity-type seismometers having small size, eddy-current damping, and an undamped period of 0.23 second. The voltage output is taken to the grid of a cathode-follower tube within the instrument and is thereafter amplified.
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Abstract Theory and description are given of sensitive capacity-type seismometers having small size, eddy-current damping, and an undamped period of 0.23 second. The voltage output is taken to the grid of a cathode-follower tube within the instrument and is thereafter amplified.
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Science, 2021
Planetary Science Because of the lack of direct seismic observations, the interior structure of Mars has been a mystery. Khan et al. , Knapmeyer-Endrun et al. , and Stahler et al. used recently detected marsquakes from the seismometer deployed during the InSight mission to map the interior of Mars (see the Perspective by Cottaar and Koelemeijer).
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Planetary Science Because of the lack of direct seismic observations, the interior structure of Mars has been a mystery. Khan et al. , Knapmeyer-Endrun et al. , and Stahler et al. used recently detected marsquakes from the seismometer deployed during the InSight mission to map the interior of Mars (see the Perspective by Cottaar and Koelemeijer).
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Universal Piezoelectric Seismometer
Seismic Instruments, 2020A universal piezoelectric seismometer is proposed that can simultaneously record linear and angular accelerations through two separate channels. The operational principle of the seismometer and the features of its design are described; the mechanical and electric circuits are considered.
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Instrument noise in seismometers
Bulletin of the Seismological Society of America, 1961Abstract Methods are developed to analyze the effects of thermal noise and seismic noise in masking small earth vibrations. The procedure is applied to a simple seismometer, seismometers with electronic and galvanometer amplifiers, and a seismometer with a shunt capacity.
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The determination of seismometer damping [PDF]
Bulletin of the Seismological Society of America, 1966 a4bstract Eaton's method of determining the seismometer damping is extended, in order to make it more easily applicable to any value of period and damping. The theory of the seismometer response to the release test is developed, showing that, for the application of this method, both release and tapping tests are equivalent.
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Astronomy & Astrophysics, 1993
We present the design of a new type of instrument to measure small doppler shifts in spectral lines. Our instrument is a form of Heterodyned, Holographic Spectrometer, here optimized for high photon efficiency. It should be suitable for the measurement of solar or stellar oscillations, which is our primary goal, or in the search for stellar-planetary ...
FRANDSEN, S, DOUGLAS, NG, BUTCHER, HR
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We present the design of a new type of instrument to measure small doppler shifts in spectral lines. Our instrument is a form of Heterodyned, Holographic Spectrometer, here optimized for high photon efficiency. It should be suitable for the measurement of solar or stellar oscillations, which is our primary goal, or in the search for stellar-planetary ...
FRANDSEN, S, DOUGLAS, NG, BUTCHER, HR
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Bulletin of the Seismological Society of America, 1936
Frank Wenner, H. E. McComb
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Frank Wenner, H. E. McComb
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