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. Material testing & NDT I Training& Certification I Consulting Visit us: Page 1 of 4. 2011-12 For refererence only. TINT' is not responsible for errors and omissions in the data if any. 4. Transmission coefficient T = 4 Z1Z2/ (Z1+Z2)2.

2011-12 Visit us: www.trinityndt.com Page 3 of 4 TRINITY NDT® Material Testing & NDT I Training& Certification I Consulting For refererence only. ‘TINT’ is not …

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