Addendum-04 Questions & Answers on Calculations
My ASNT Level III UT Study Notes 2014-June.
Expert at Works
Content: Exercise 1 Exercise 2
Expert at Works too!
Content: Exercise 1 Exercise 2
Expert at Works – The real achiever!
Questions & Answers
Practices Make Perfect
Practices Make Perfect
Click to Q&A
http://www.ndtcalc.com/index.php?page=quiz&method=ut&qs=50
More Reading Q&A Questions &on Answers
http://www.ndtcalc.com/index.php?page=quiz&method=ut&qs=50
2.0: Ultrasound Formula
http://www.ndt-ed.org/GeneralResources/Calculator/calculator.htm
Ultrasonic Formula
Ultrasonic Formula
Inverse Law and Inverse Square Law For a small reflector where the size of reflector is smaller than the beam width, the echoes intensity from the same reflector varies inversely to the square of the distance.
5cm
75% FSH
7.5cm
33% FSH
Inverse Square Law
http://www.cyberphysics.co.uk/general_pages/inverse_square/inverse_square.htm
Inverse Law: For large reflector, reflector greater than the beam width, e.g. backwall echoes from the same reflector at different depth; the reflected signal amplitude varies inversely with the distance.
10cm
7.5cm
Echo Amplitude- Reflector Size “D” & Depth “d” Relations: (small reflector- Inverse square law)
Amplitude α D2 Amplitude α 1/d2 Amplitude = kD2/d2 , k =constant Amplitude1/ Amplitude2 = D12 d22 / d12 D22
d
Amplitude D
Echo Amplitude- Reflector Size “D” & Depth “d” Relations: (large reflector- inverse law)
Amplitude α 1/d Amplitude = k/d , k =constant, Amplitude1/ Amplitude2 = d2 / d1
d
Amplitude D
Scanning Speed: Scanner speed = (PRR / Number of hits) × Effective diameter of probe Speed of test part = (PRR / Number of hits) × Effective diameter of probe Where: Effective dia. of probe = Dia. of probe – 2 [ (Dia. of probe) × (Percent of overlap between scan / 100) ] PRR = Pulse Repetition Rate Linear speed of disc or pipe in mm/ s = (2πr x RPM / 60) where r = radius of disc or pipe in mm RPM = Number of Rotation of pipe Per Minute = Revolution Per Minute