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31.
A. R. Bulsara V. In A. Kho G. Anderson C. Obra P. Longhini J. Neff S. Baglio B. Ando A. Palacios 《The European Physical Journal B - Condensed Matter and Complex Systems》2009,69(1):109-118
We consider the performance of a nonlinear dynamic device, operated as a threshold detector, in the time domain. The device
is characterized by a figure-of-merit that involves the mean residence times in its two stable steady states, as well as the
dispersion in this quantity stemming from a noise floor. As a particular example, we consider a coupled (overdamped) oscillator
system, the underpinnings of a coupled core magnetometer (CCM). We provide a detailed discussion of how the device is used,
in practice, to detect a weak dc target magnetic field, and explain the importance of characteristic time-scales in the problem
specifically the device time-constant, the noise correlation time and the observation time (to obtain an averaged reading
in the presence of noise). A device “Resolution” is introduced as a performance measure and is, analytically, computed under
specific (but realistic for practical applications) conditions. This measure is shown to be independent of the target signal;
in fact it depends only on the noise and device parameters, in the weak signal limit (that is of interest in most applications).
The resolution is seen to be analogous to the inverse of a response signal-to-noise ratio. 相似文献
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