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Measurement of Steady State and Transient Solid Propellant Burning Rates with Microwaves.
GEORGIA INST OF TECH ATLANTA SCHOOL OF MECHANICAL ENGINEERING
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A microwave continuous measurement technique has been utilized to measure burning rates of a CTPB and AP composite solid propellant during steady state and rapid decompression. A microwave signal oscillating at a known source frequency is passed through the end of a burning propellant strand opposite the burning surface and allowed to reflect off the burning surface which is receding at some unknown velocity. By continuously comparing the phse angle of this reflected signal with the phase angle of another signal oscillating at the original source frequency, a relative phase angle between the two signals is obtained. The rate of change of this relative phase angle with time is proportional to the propellants burning rate. Accurate plus or minus 10 percent continuous burning rate data was obtained and shown to be within capabilities of the system for dPdt values less than about 2500 psisecond. Modified author abstract
APPROVED FOR PUBLIC RELEASE