Modulation Pickup in Nuclear Magnetic Resonance rf Spectrometers
作者:
G. B. Robinson,
F. E. Geiger,
期刊:
Review of Scientific Instruments
(AIP Available online 1958)
卷期:
Volume 29,
issue 8
页码: 730-731
ISSN:0034-6748
年代: 1958
DOI:10.1063/1.1716310
出版商: AIP
数据来源: AIP
摘要:
Radio‐frequency oscillators used as detectors of nuclear paramagnetic resonance absorption employ an auxiliary source at audio frequency to modulate the static magnetic field. A small component of voltage at this frequency is usually induced into the tank coil of the oscillator. If this voltage is permitted to appear at the grid of the oscillator, mixing with the rf voltage will occur. This produces a false signal indistinguishable from the resonance signal. A simple LC filter put between tank circuit and oscillator tube is found to be extremely effective in removing false resonances. The response of the oscillator to signals generated by a Watkins calibrator is measured in the range from 5 to 25 Mc. Results of these and ``Q'' measurements show the oscillator sensitivity to be unimpaired by the addition of the LC network.
点击下载:
PDF
(133KB)
返 回