No description available.

A Rogowskl coil has been used to measure current in a pulsed discharge circuit. The frequency response of the coil has been determined experimentally, It has been established that the noise signal associated with the measurement of a pulsed discharge current is due principally to the electromagnetic radiation from the spark gap switches required in such a circuit. The radiation can be reduced by pressurizing the spark gap with argon, but at the same time the breakdown potential of the switch becomes erratic. A simple measuring system has been devised which completely eliminates the noise signal from the current waveform. The system consists of a balanced differential preamplifier which is fed by a completely balanced measuring circuit into which a 0.5µ sec delay line has been incorporated. / Science, Faculty of / Physics and Astronomy, Department of / Graduate

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No description available.

Thesis (M.S.)--University of Wisconsin--Madison, 1964. / eContent provider-neutral record in process. Description based on print version record. Bibliography: l. 82-84.

Thesis (M.S.)--Worcester Polytechnic Institute. / Title from title screen. Keywords: optimal design; modeling; object identification; ultrasound pulse-echo system; annular array. Includes bibliographical references (p. 159-162).

No description available.

An attempt is made to receive pulsar signals at a frequency (22 MHz) lower than they have been received before. The problem of high galactic background radiation is the dominant one. The receiver used optimizes the ratio of signal to sky background noise. The technique uses the property that pulsar signals are dispersed by intervening electrons. Using the known dispersion relation it is possible to predict the phase of the pulsar signal at one frequency (22 MHz) if it is known at another frequency (150 MHz). The receiver then tracks the pulse in frequency vs. time with a bandwidth which is small enough to match the instaneous bandwidth of the signal. Although it was found that pulsar signals from CP 1919 are still too weak to be received on such a system, an upper limit to their strength was obtained by measuring its sensitivity. At the time of observation (August, 1969) the signal strength at 22 MHz, averaged over 2600 pulses, was less than 1.0 x 10⁻²⁶ joules per m² of capture cross-section per unit bandwidth. / Applied Science, Faculty of / Electrical and Computer Engineering, Department of / Graduate

No description available.

Thesis (M.S.) -- Worcester Polytechnic Institute. / Keywords: ultrasound modeling; annular arrays. Includes bibliographical references (p.197-198).