The Investigation of an Electron Resonance Spectrometer Utilizing a Generalized Feedback Microwave Oscillator

The purpose of this investigation was to determine the technical feasibility and the attainable sensitivity of a "self-stabilized" oscillator-spectrometer system in terms of a generalized sample-carrying feedback element to replace the conventional spectrometer systems. This new "self-stabilized" oscillator-spectrometer has a microwave amplifier with a generalized network element in the positive feedback loop causing oscillation to occur at the network\´s central resonant frequency, with essentially instantaneous frequency stability. This eliminates the need for electronic frequency stabilizing equipment. With the paramagnetic test sample located in the H field of the generalized feedback element, the network\´s attenuation and phase characteristics are altered when paramagnetic resonance occurs. The resultant problem is to determine the effect this charge has on the oscillator\´s amplitude and frequency of oscillation. From this, the system\´s ultimate sensitivity is determined from a consideration of the noise within the oscillator loop.