THE STUDY OF THE ORIGIN AND PROPAGATION OF DISTURBANCES IN THE BURNING OF SOLID PROPELLANTS
Quarterly technical summary rept. no. 17, 1 Jan-31 Mar 1963
STANFORD RESEARCH INST MENLO PARK CA
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The report deals with the continued investigation of the reflected- pulse method for measuring the normal acoustic admittance of burning propellant surfaces. Work was primarily concerned with problems of instrumentation which must be resolved before meaningful tests with burning propellants can be attempted. A first version of the circuitry for the multi-line recording system was completed. It had been felt for some time that the accuracy of the pulse measurements could be further improved by increasing the number of lines per centimeter on the overlays which are used to provide a vertical scale for reading the oscillograms. A new master grid of 120 linescm was obtained, and preliminary tests indicate that it should yield excellent replicas. Problems involving the transducers, water-cooled microphones with associated amplifiers were resolved.