Ultrasonic testing useful formulae - Trinity NDT

Ultrasonic testing (UT) useful formulae . 1. velocity of Ultrasonic Waves in a medium (V) = f x l OR. Where f = Number of cycles per second is called frequency. Measured in Hertz'. Abbreviated as Hz'. One Hertz is equivalent to One cycle per second l = Distance covered in one cycle is wavelength V= velocity of Ultrasonic wave inside the medium in mm/s'. 2. acoustic impedance (Z) = V x r Where: Z= acoustic impedance r= Density V= velocity 3. Reflection Coefficient Where: R = Reflection Coefficient Z1 = acoustic impedance of Medium 1. Z2 = acoustic impedance of Medium 2.. Trinity NDT.

2011-12 Page 2 of 4 4. Transmission coefficient T = 4 Z1Z2/ (Z1+Z2)2 Where: R = Reflection Coefficient Z1 = Acoustic Impedance of Medium 1 Z2 = Acoustic Impedance of Medium 2 5. Longitudinal Wave Velocity Where: VL = Longitudinal Wave Velocity E = Modulus of Elasticity

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  Testing, Ultrasonic, Acoustic, Useful, Reflections, Formulae, Impedance, Velocity, Ultrasonic testing useful formulae, Acoustic impedance

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