Multi-Scale Temperature Measurements in Shocked Materials Using Raman Thermometry

Experimental shock temperatures can help calibrate and constrain thermomechanical and reactive burn models, providing a more accurate description of the physical processes and underlying chemistry of high explosives (HE). However, shock temperatures continue to be a poorly constrained variable, especially across the strain rates, length scales, and time scales relevant to HE safety and performance. We present a methodology for temperature measurements across multiple length scales by coupling spontaneous, Stokes/anti-Stokes Raman spectroscopy, or Raman thermometry (RT), to macro- and mesoscale shock experiments. At the macroscale, shock temperatures were measured on mm-thick PBX 9501 samples shocked by single-stage light gas gun. At the mesoscale, temperature measurements are being collected on tens of micron-sized β-quartz shocked with laser-driven flyer plates. These measurements are compared to theoretical shock equation of state temperatures. These experiments are building towards temperature measurement of single crystal and polycrystalline HE across these platforms to provide a more detailed description of the bulk and local temperatures generated during shock for developing high-fidelity models.