Acoustic Longitudinal Field NIF Optic Feature Detection Map Using Time-Reversal & MUSIC

Lehman, S K

Lawrence Livermore National Laboratory

关键词: Signal-To-Noise Ratio;    Transducers;    99 General And Miscellaneous//Mathematics, Computing, And Information Science;    Classification;    Acoustics;   

DOI  :  10.2172/899101
RP-ID  :  UCRL-TR-219349
RP-ID  :  W-7405-ENG-48
RP-ID  :  899101

美国|英语

来源: UNT Digital Library

【 摘 要 】

We developed an ultrasonic longitudinal field time-reversal and MUltiple SIgnal Classification (MUSIC) based detection algorithm for identifying and mapping flaws in fused silica NIF optics. The algorithm requires a fully multistatic data set, that is one with multiple, independently operated, spatially diverse transducers, each transmitter of which, in succession, launches a pulse into the optic and the scattered signal measured and recorded at every receiver. We have successfully localized engineered ''defects'' larger than 1 mm in an optic. We confirmed detection and localization of 3 mm and 5 mm features in experimental data, and a 0.5 mm in simulated data with sufficiently high signal-to-noise ratio. We present the theory, experimental results, and simulated results.