Acoustic Birefringence (AB) measurement

Analogic Engineering, Inc. conducts research using an ultrasonic stress measurement technique known as Acoustic Birefringence (AB) to measure longitudinal stress in rail and calculate Rail Neutral Temperature (RNT). The work builds on acoustic birefringence instrumentation developed under prior NSF SBIR work and was supported by the Federal Railroad Administration. The company designed and built a fixture simulating thermally-induced stress up to 165 KIP and validated the method against strain-gauge instrumented rail at the Transportation Technology Cent

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custom instrumentationin-situ rail testingnon-destructive measurementphased-array Electromagnetic Acoustic Transducer (EMAT) designsignal processingtime-of-flight measurementultrasonic stress measurement