Addendum-04Questions & Answerson Calculations My ASNT Level III UT Study Notes2014-June.

Expert at Works

Content:

Exercise 1Exercise 2

Expert at Works too!

Content:

Exercise 1Exercise 2

Expert at Works – The real achiever!

Questions & Answers

Practices Make Perfect

Practices Make Perfect

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http://www.ndtcalc.com/index.php?page=quiz&method=ut&qs=50

Questions & Answers

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2.0: Ultrasound Formula

http://www.ndt-ed.org/GeneralResources/Calculator/calculator.htm

Ultrasonic Formula

Ultrasonic Formula

Inverse Law and Inverse Square LawFor 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 7.5cm

75% FSH 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 =constantAmplitude1/ Amplitude2 = D1

2 d22 / d1

2 D22

D

d

Amplitude

Echo Amplitude- Reflector Size “D” & Depth “d” Relations:(large reflector- inverse law)

Amplitude α 1/dAmplitude = k/d , k =constant, Amplitude1/ Amplitude2 = d2 / d1

D

d

Amplitude

Scanning Speed:

Scanner speed = (PRR / Number of hits) × Effective diameter of probeSpeed 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 RateLinear speed of disc or pipe in mm/ s = (2πr x RPM / 60)where r = radius of disc or pipe in mmRPM = Number of Rotation of pipe Per Minute = Revolution Per Minute