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Technical Discussions
Lirin Philip
,
VALDEL , India, Joined Sep 2019, 9

Lirin Philip

,
VALDEL ,
India,
Joined Sep 2019
9
07:13 Sep-05-2019
NDT Ultrasonic testing

What is the relation between diameter of probe and Gain dB level in UT Testing? I have got 5MHz probes of size .5" and .25". Testing on same material, .5" probe takes only 26dB at 80% back echo while .25" probe takes 46dB. what must be the reason?

    
 
 Reply 
 
Anmol Birring
Consultant,
Birring NDE Center, Inc., USA, Joined Aug 2011, 738

Anmol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
738
23:43 Sep-07-2019
Re: NDT Ultrasonic testing
In Reply to Lirin Philip at 07:13 Sep-05-2019 (Opening).

Smaller the dia higher is the beam spread

1    
 
 Reply 
 
Akshay Gaikwad
NDT Inspector,
EQUATE Petrochemical Company, Kuwait, Joined Mar 2017, 1

Akshay Gaikwad

NDT Inspector,
EQUATE Petrochemical Company,
Kuwait,
Joined Mar 2017
1
11:29 Sep-08-2019
Re: NDT Uultrasonic testing
In Reply to Lirin Philip at 07:13 Sep-05-2019 (Opening).

Hi Lirin,
As you know larger diameter(0.5") probe emits more energy than smaller dia(0.25") probe.
As per Beam spread calculation larger dia (0.5") probe have less beam spread than smaller dia (0.25"), hence there is less energy loss(Attenuation) in larger dia probe.
that's why you are getting 26dB for 0.5" dia probe & 46dB for 0.25" dia probe to make 80% FSH.

For More clarification with this topic go through Attenuation Chapter in ASNT Level II Study Guide.

Hope you will be cleared by this, otherwise revert me...

2    
 
 Reply 
 

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