Refinement of Photonic Doppler Velocimetry in Gas Dynamic Studies using Barrel Loaders
E. A. Chudakov1, S. A. Finyushin2, A. E. Safronov2, A. M. Tarasov2, L. V. Chernov1, D. N. Zamotaev2, V. V. Barabin2, V. N. Knyazev2, E. N. Bogdanov2
1Nizhny Novgorod State Technical University, Nizhny Novgorod, Russia
2All-Russian Scientific Research Institute of Experimental Physics (VNIIEF), Sarov, Russia
Keywords: laser heterodyne interferometer, barrel loaders, shock-wave compression
Abstract
Data are presented on the adaptation of photonic doppler velocimetry (PDV) for gas-dynamic studies using barrel loaders. Measuring channels are time-matched via direct measurements of relative time corrections of PDV with an accuracy of up to 0.1 ns using the correlation analysis of the transit time of femtosecond pulses with different repetition periods through the measured fiber lines. The angle of impact of the projectile with the sample studied is determined using a linear regression method, which allows for the most complete use of the entire volume of experimental data and statistical determination of confidence intervals of the estimates obtained. Reliable recording of elastic wave parameters is carried out using a method of active-passive diagnostics of the PDV, which allows one to completely eliminate the interfering reference line and, accordingly, to increase the time and velocity resolution of the PDV.
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