ADL ORVIS: an air-delay-leg, line-imaging optically recording velocity interferometer system

Area of Science:

• * Experimental Physics
• * Optical Metrology
• * Materials Science

Background:

• * Accurate measurement of material response under dynamic loading is crucial for understanding material behavior.
• * Traditional velocity interferometry systems have limitations in spatial resolution and sensitivity.

Purpose of the Study:

• * To design and implement a line-imaging optically recording velocity interferometer system (ORVIS) with enhanced velocity sensitivity.
• * To demonstrate the system's capability in analyzing complex dynamic events like flyer plate reverberations and impact-induced ramp waves.

Main Methods:

• * Development of an air-delay leg interferometry system utilizing relay optics (parabolic reflectors) for signal transmission.
• * Tuning the instrument to a velocity per fringe constant of 22.4 m/s/fringe for high sensitivity.
• * Application to laser-driven flyer plates and symmetric impact studies of fused silica.

Main Results:

• * The system achieved high velocity sensitivity, distinguishing differences of 1-2 m/s.
• * Spatially resolved velocity-time profiles were acquired for laser-driven flyer plates, revealing low-amplitude reverberations.
• * Ramp-wave profiles in fused silica impact experiments compared favorably with conventional line-imaging ORVIS.

Conclusions:

• * The developed air-delay line-imaging ORVIS offers superior velocity sensitivity and spatial resolution for dynamic material studies.
• * The system effectively captures subtle velocity variations in complex experimental scenarios.
• * This advanced interferometry technique provides valuable data for validating material models under extreme conditions.