A Radically New Principle of Operation Seismic Detector of Nano-Scale Vibrations

Neural Network-Based Laser Interferometer Compensation for Seismic Signal Detection

“…The environmental error causes a significant problem of a measurement accuracy in case of the nanoscale instrument [7]. In order to improve measurement precision, we use a data fusion method to reduce the error that exists in the measurement data.…”

Newly-Proposed Methods for Early Detection of Incoming Earthquakes, Tsunamis & Tidal Motion

“…Besides, due to flat shape, even a little shift of the position of a normal-conducting plate, placed near the coil, may www.intechopen.com lead to strong distortion of the field distribution around the coil. These features, and the stability of TD-oscillators (F stability 1-10Hz, F/F10  7 -10  6  depending on the model & temperature  see [2,[11][12]) enabled us to reach 6 orders relative resolution in SFCO technique [3][4], permitting to effectively use it in a basic research [5][6][7][8], as well as in some modern technical applications [9][10]. In the last case, frequency of the oscillator is mainly used as a testing parameter, and the measuring effect is determined by a distortion of the MHz-range testing field configuration near the coil face by the vibrating copper plate, leading to the magnetic inductance changes of the coil, with a resolution  1-10pH (depending on operation temperature of a technique), resulting in the changes of test oscillator frequency.…”

“…Advantages of the SFCO technique become more evident at slow movements of the objects, positioned near the coil face. Just therefore, this method has been very soon applied for the creation of a nano-scale absolute-shift position sensor, which one may successfully use in many areas: for example, for the quasi-static (slowmovement) Seismometry [9][10], in various security systems. Why this problem is so urgent?…”

“…At low (and especially, at super-low) frequencies, however, it becomes hard to maintain the hanging reference fixed, and for detection of quasi-static deformations and low-order free oscillations of the earth's crust, tidal motion (moon movement), and for observation of mechanical vibrations of buildings, bridges, etc., the strain-meters may take noticeable lead over inertial seismometers. We describe in this Chapter how to overcome such lack of acting seismographs/accelerometers/vibrometers by the use of the recently offered by us flat-coil-based, super-broadband, nano-scale-resolution position sensor [9][10]. The more so, because further development of such a highly sensitive sensor technology may contribute also to on-time tracking (prediction) of potential incoming tsunamis, and monitoring of the state and zone borders as well.…”

Seismic Wave Detection based on Laser Interferometer for P-S Time Measurement

“…Wu [2] proposed Fiber Bragg Grating (FBG) based accelerometer which is robust to EMI, and has a signal multiplexing capability. Gevorgyan [3] suggested the single-layer open-flat-coil (OFC) oscillator-based sensitive platform technology to overcome the defect of seismometer and accelerometer.…”