Accession Number:

AD0417283

Title:

THE INVESTIGATION OF AN ELECTRON RESONANCE SPECTROMETER UTILIZING A GENERALIZED FEEDBACK MICROWAVE OSCILLATOR,

Descriptive Note:

Corporate Author:

ROHM AND HAAS CO PHILADELPHIA PA

Personal Author(s):

• Payne,John B.

Report Date:

1963-08-01

Pagination or Media Count:

22.0

Abstract:

The study of Electron Paramagnetic Resonance EPR has yielded much information on molecular interaction and binding forces present in solid state as well as gaseous materials. In this in vestigation, an entirely different appro is taken to develop a self-stabilized EPR spectrom eter system which eliminates the usual low power klystron oscillator, electronic frequency sta bilizing equipment, and the complex superhetero dyne detector, without sacrificing loss of de tection sensitivity. This system, which is known as an oscillator-spectrometer, consists of a microwave amplifier containing a sample-carry ing network element in the positive feedback loop. The microwave device oscillates at the networks central resonant frequency with essen tially instantaneous frequency stability. Ex pressions relating the change in power level and frequency of oscillation as a function of the change in the network attenuation and phase at magnetic resonance are derived. The systems ultimate sensitivity is determined by analyzing the noise within the oscillator loop. The prob lem reduces to the fact that if an amplifier with noise figure F1 is connected as an oscillator, what, then, will be the resultant noise fluctua tion of the oscillatorss frequency and output amplitude. Author

Descriptors:

• FEEDBACK
• AIR FORCE RESEARCH

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE