Patent ID: 8887572
Filing Date: 2014-11-18
Classification: B61K,G01L,G01N

Abstract:
1. A system for analyzing stress in a polycrystalline specimen, comprising: a. a first ultrasonic transducer configured to transmit a first ultrasonic wave at a first angle of incidence towards a target location on a specimen; b. a second ultrasonic transducer configured to transmit a second ultrasonic wave at a second angle of incidence towards the target location on the specimen; c. a voltage source configured to excite the first and second ultrasonic transducers, wherein each transducer is configured to operate in pulse-echo mode to receive a scattered ultrasonic signal from the specimen in response to the first and second ultrasonic waves; d. a processor configured to calculate a statistical spatial variance value from the plurality of scattered ultrasonic signals as a function of spatial position, wherein the scattered ultrasonic signal received by the first and second transducers comprises both longitudinal and shear waves; and e. database of theoretical spatial variance values wherein said statistical spatial variance values for the longitudinal and shear waves are compared to the theoretical variance values to assess changes in microstructure properties of the specimen over time.