Impulse response magnetic resonance spectrometer
First Claim
1. A magnetic resonance spectrometer for operating with inpulse response, said spectrometer comprising:
- first means for the magnetic polarization of a specimen;
second means for generating excitation signals having a period of recurrence Tr, and a duration To shorter than Tr, said second means including a high-frequency oscillator, and a modulating circuit for both amplitude modulating and frequency modulating, with said period Tr, the output signal from said oscillator, so that each of said excitation signals be formed by at least one train of linearly frequency modulated oscillations; and
detecting means for detecting the impulse response of said specimen to each of said excitation signals.
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Abstract
The circuit for providing the high-frequency short signals which excite the specimen comprises a low-frequency oscillator linearly frequency-modulated during the course of time intervals of duration To which are much shorter than their recurrence periodicity Tr ; the output signal from the low frequency oscillator is frequency translated in a single side-band modulator supplied with a high-frequency wave by a high- frequency generator. An amplitude modulator makes it possible, in the course of the time intervals of duration To, to create gaps in the output signal from the single side band modulator or, instead, to increase the amplitude of said signal during part of the frequency sweep. It furthermore suppresses the signal outside said time intervals of duration To.
29 Citations
7 Claims
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1. A magnetic resonance spectrometer for operating with inpulse response, said spectrometer comprising:
- first means for the magnetic polarization of a specimen;
second means for generating excitation signals having a period of recurrence Tr, and a duration To shorter than Tr, said second means including a high-frequency oscillator, and a modulating circuit for both amplitude modulating and frequency modulating, with said period Tr, the output signal from said oscillator, so that each of said excitation signals be formed by at least one train of linearly frequency modulated oscillations; and
detecting means for detecting the impulse response of said specimen to each of said excitation signals. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- first means for the magnetic polarization of a specimen;
Specification