1,721,014 research outputs found
Tellus Experiment.A multi-instrument Payload for the investigation of the Topside Ionosphere
No full textA new space project, which summarizes previous ones reported in several LNGS
Annual Reports, has been proposed by the TELLUS team for the investigation
of ionospheric and magnetospheric phenomena within the Earth-near-Earth space couplings. The project includes the study of natural disasters taking place in the
Earth surface (as earthquakes) and their possible deterministic prediction on the
basis of precursory phenomena to be reconciled with perturbations occurring in
the topside ionosphere. After an introductory section on the subject, technical,
scientific, and methodological details are given on the project
TELLUS. A new electromagnetic strainmeter for the monitoring of ground-field deformations
No full text
Tellus Experiment. Method for Signal Conditioning and Data Acquisition System, based on Variable Amplification and Feedback Technique
No full textIn many space and ground-based applications of interest for the TELLUS Experiment
the amplitude and frequency content of analog signals to be detected is
a priori unknown and can lie in a very large range of values [1-5]. This is a particularly
challenging problem to be managed, especially when the data acquisition
and signal analysis must be carried out in extreme environments where large data
processing resources are requested together with a low power consumption and high
efficiency of the device. The method is specifically useful when power spectrum of
measured signals exhibits a very large variability in the different frequency bands
making particularly difficult the runtime signal analysis of the phenomena under
study. The method proposed within the TELLUS Experiment is of particular interest
in two applications. The first being an analysis of multi-channel analog signals
constituted by several frequency components each one of which exhibits very different
amplitudes that need to be simultaneously registered by the acquisition system.
The second application further enhances the specific characteristics of the method
when, in addition to manage multichannel analysis, we should treat multiparameter
data (i.e. data relating to signals of different nature associated with parameters or
fields different from each other) [6]
Method for signal conditioning and data acquisition system, based on variable amplification and feedback technique
No full textAn original method of signal conditioning and adaptive amplification is proposed for data acquisition systems of analog signals, conceived to obtain a high resolution spectrum of any input signal. The procedure is based on a feedback scheme of the signal amplification with aim at maximizing the dynamic range and resolution of the data acquisition system. The paper describes the signal conditioning, digitization, and data processing procedures applied to an a priori unknown signal in order to enucleate its amplitude and frequency content for applications in different environments: on the ground, in space, or in the laboratory. In the paper are also discussed the main fields of application and advantages of the method with respect to those known toda
Risultati preliminari di possibili effetti elettromeccanici non lineari in campioni di roccia
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