Publication

Broadband decoupling in NMR with frequency-modulated 'chirp' pulses

Geoffrey Bodenhausen
1995
Journal Articles

Abstract

In NMR of spins with I = 1/2 in an isotropic phase, it is demonstrated by simulation and expt. that virtually unlimited bandwidths can be decoupled effectively by using chirp pulses with linear frequency modulation for adiabatic inversion combined with phase-cycles and supercycles similar to those used in composite pulse decoupling. The av. radio-frequency amplitude required is modest compared to other techniques. In applications with inhomogeneous radio-frequency fields, as in magnetic resonance imaging and localized spectroscopy with surface coils, the radio-frequency amplitude can be apodized at the rising and falling edges of chirp pulses to improve adiabatic behavior. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/98f8991a-254b-43c6-b69b-269ea1a83bcf

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Geoffrey Bodenhausen
1995
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/98f8991a-254b-43c6-b69b-269ea1a83bcf

About this result

Related concepts (32)

Frequency modulation

Frequency modulation (FM) is the encoding of information in a carrier wave by varying the instantaneous frequency of the wave. The technology is used in telecommunications, radio broadcasting, signal processing, and computing. In analog frequency modulation, such as radio broadcasting, of an audio signal representing voice or music, the instantaneous frequency deviation, i.e. the difference between the frequency of the carrier and its center frequency, has a functional relation to the modulating signal amplitude.

Amplitude modulation

Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting messages with a radio wave. In amplitude modulation, the amplitude (signal strength) of the wave is varied in proportion to that of the message signal, such as an audio signal. This technique contrasts with angle modulation, in which either the frequency of the carrier wave is varied, as in frequency modulation, or its phase, as in phase modulation.

Modulation

In electronics and telecommunications, modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a separate signal called the modulation signal that typically contains information to be transmitted. For example, the modulation signal might be an audio signal representing sound from a microphone, a video signal representing moving images from a video camera, or a digital signal representing a sequence of binary digits, a bitstream from a computer.

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Broadband decoupling in NMR with frequency-modulated 'chirp' pulses

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