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In general, the use of any heavy oil will give a damping that is near critical, a value of 0.75 to 1.0 in figure 10. Corrections for less damped systems will probably not be necessary unless a fluid less viscous than a heavy oil is used, such as water.
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damped seismographs for which A = I, i.e. the seismographs for which the .... critically damped. In order to provide the desired periods for the turning ...
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critically damped, zero-coupled seismograph. .... ( f ) Seismometer critically damped, galvanometer underdamped. For this case. 80 = (Do, 80 < 0) 0 ...
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It is thus evident that the concept of 'critical damping' or any fixed damping and free period for the seismograph is not valid. The response recorded at ...
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It is emphasized that reliable estimates of instrumental transfer functions are obtained by least-squares inversion of the calibration pulse, particularly for underdamped or near critically damped seismographs, where the Gaussian noise distribution is the dominant source of error.
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Final results have also been given for the special types of seismographs in which the seismometer period and galvanometer period are equal and the galvanometer is critically damped.
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published basic constants of the electromagnetic seismograph - the free periods ..... In this case one system is critically damped and the second system is ...
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The periods in free decay of the seismometer and tiltmeter (neither critically damped) are respectively 15 s and 10 s, approximately. In the day 217 records above, the natural period of each instrument is obvious in its power spectrum (the sharpest line within the broadened low region of the graph).
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In keeping with nomenclature that is close to electronics tradition, early seismograph users tried to understand their instruments by working with a plot of ``acceleration power density''. ... 1. We now restrict our attention to instruments that are nearly critically damped, and consider what happens to NEP as the...
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For a solution where R = 0, which is the critical damping value for x(t), ... (paper on a rotating drum) seismograph or digitized for digital data systems. ...
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