منابع مشابه
Chirp excitation.
The paper describes the design of broadband chirp excitation pulses. We first develop a three stage model for understanding chirp excitation in NMR. We then show how a chirp π pulse can be used to refocus the phase of the chirp excitation pulse. The resulting magnetization still has some phase dispersion in it. We show how a combination of two chirp π pulses instead of one can be used to elimin...
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Most ultrasonic guided wave methods require tone burst excitations to achieve some degree of mode purity. In addition, it is often desirable to acquire data using multiple frequencies, particularly during method development when the best frequency for a specific application is not known. However, this process is inconvenient and time-consuming, particularly if extensive signal averaging at each...
متن کاملShort-time chirp excitation for wideband identification of dynamic objects
In this paper, some aspects of choosing excitation signals for fast measurement of complex electrical impedance of objects, including impedance of biological tissues, over a wide range of frequencies are discussed. For this purpose, several short-time excitation signals as special cases of chirp signals of near to minimal duration are proposed. The results of analysis and simulation are promisi...
متن کاملEffect of input pulse chirp on nonlinear energy deposition and plasma excitation in water
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ژورنال
عنوان ژورنال: Journal of Magnetic Resonance
سال: 2017
ISSN: 1090-7807
DOI: 10.1016/j.jmr.2017.07.003