Low Frequency Superregenerative Oscillator Design for the Detection of Broad-Line Nuclear Magnetic Resonances

Abstract

Two superregenerative nuclear magnetic resonance detectors are described which have proved useful for the detection of broad resonances. These oscillators are capable of sensitive operation at radio frequencies as low as 2.5 Mc and quench frequencies ranging from about 50 kc near 3 Mc to 120 kc at 10 Mc. In the one case for which a comparison was made, the sensitivity of the superregenerative oscillator design was found to be comparable to that of a crossed‐coil spectrometer operating under optimum conditions.