Accession Number : AD0472632


Title :   EVALUATION OF THE LIGHT DEFLECTION TECHNIQUE FOR THE DETECTION OF SHOCK WAVES IN SHOCK TUBES AT MODERATE PRESSURE AND/OR LOW SHOCK MACH NUMBER,


Corporate Author : YALE UNIV NEW HAVEN CT MASON LAB


Personal Author(s) : Eberstein, Igor J


Report Date : Sep 1965


Pagination or Media Count : 10


Abstract : The light deflection technique for shock detection in shock tubes was found to operate reliably for driven gas pressures above 20 mm Hg and for shock Mach numbers above 1.05. The potential response time of the light deflection technique was calculated to be in the order of 10 nanoseconds. A new amplifier was built containing a pulse-forming circuit which may be changed to suit the resolution of the time counter. Thus, a pulse with 0.5 microsec rise time was used with a counter having 1 microsec resolulion. By changing the values of the elements in the R-C pulse-forming circuit, the amplifier can be made to yield shorter rise times for use with counters having better time resolution, the limiting rise time being approximately 0.01 microsec. For fast trigger pulses the stages of the amplifier beyond the spreading circuit would have to be modified to accommodate the higher frequency response required. (Author)


Descriptors :   *DETECTION , *SHOCK WAVES , *SHOCK TUBES , TRANSDUCERS , REFRACTION , LIGHT , DEFLECTION , PRESSURE , FIBER OPTICS , PULSE AMPLIFIERS , MATHEMATICS


Distribution Statement : APPROVED FOR PUBLIC RELEASE