Accession Number : AD0813084
Title : INVESTIGATION OF MAGNETIC SPIN RESONANCE.
Descriptive Note : Interim rept.,
Corporate Author : SYRACUSE UNIV RESEARCH CORP NY
Personal Author(s) : Worden, Robert ; Mollenhauer, Clark ; Lewis, Owen
Report Date : MAR 1967
Pagination or Media Count : 61
Abstract : The application of spin echo techniques to the detection of radar signals is considered. Of principle concern is a new technique which has been called PRESET (PREset Spin Echo Technique). This new technique offers the following advantages: (1) High compression ratios; (2) Waveform flexibility; (3) Microwave operation. Both theory and experiment are covered. Theoretical work is concerned with model development of the dynamics of the spin system and with materials for spin echo application. Experimental results for pulse compression of a linear FM chirp waveform and of a pseudo-quadratic (sinusoidal FM) waveform are presented. Conclusions reached can be summed up in the statement that the technique offers a new approach and solutions to some problems in wideband pulse compression which are difficult to deal with by conventional techniques. One of the principle disadvantages is the present requirement for operation of the device at liquid helium temperatures. Materials investigations, however, have shown promise that with further research this requirement could be relaxed. (Author)
Descriptors : *ELECTRON PARAMAGNETIC RESONANCE), (*RADAR SIGNALS, PARAMAGNETIC MATERIALS, MAGNETIC RESONANCE, DETECTION, PULSE COMPRESSION, LOW TEMPERATURE, EXCITATION, DOPPLER EFFECT, FREQUENCY MODULATION, RADIOFREQUENCY PULSES, RELAXATION TIME.
Subject Categories : Active & Passive Radar Detection & Equipment
Electricity and Magnetism
Distribution Statement : APPROVED FOR PUBLIC RELEASE