Method and apparatus for digital quadrature lock-in detection in magnetic resonance
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United States of America Patent
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Jul 29, 2008
Grant Date -
Jan 11, 2007
app pub date -
Jun 23, 2006
filing date -
Jun 27, 2005
priority date (Note) -
Expired
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Abstract
A method and apparatus for digital quadrature lock-in detection capable of receiving magnetic resonance signals or electron spin resonance signals at high sensitivity. The method starts with digitizing a signal wave consisting of a magnetic resonance or electron spin resonance signal. The digitized signal wave is multiplied by digitized reference waves of sine and cosine functions to obtain signals of real and imaginary parts which are 90.degree. out of phase (multiplying step). The frequencies of the sine and cosine functions are varied according to the observation width. The multiplying step is repeated.
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