MILITARY APPLICATIONS OF NUCLEAR RESONANCE FILTERS
Status rept. for 1 Nov 1952-31 Jan 1953
VARIAN ASSOCIATES INC PALO ALTO CA
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The project includes 1 experimental demonstrations to show that the nuclear induction filter works, 2 a theoretical study of the problem, and 3 an analysis of the behavior of the nuclear induction filter as a new type of filter element. Test gear was constructed, which consisted of 2 crystal- controlled RF sources, to provide simulated ground clutter and a simulated Doppler-shifted target echo. The device was used to show that a weak signal passes through the filter and is unaffected by the presence of a much larger signal at a slightly different frequency. With a nuclear time constant of about 130 sec, a 10-c difference between the Doppler shifted frequency and the simulated ground clutter was required to remove the interaction between the 2 pulses. The saturated pulses appeared to be differentiated, rather than completely saturated this indicated impaired filter action. In general, the output pulse amplitude started to increase before he occurrence of the input pulse and decayed after the input pulse for the saturated region. A 30-mc phase- sensitive detector was used to show that for wide pulses the edges of the pulses are transmitted by the v-component, the absorption part.
- Nuclear Physics and Elementary Particle Physics