where expertise comes together - since 1996 -

The Largest Open Access Portal of Nondestructive Testing (NDT)

Conference Proceedings, Articles, News, Exhibition, Forum, Network and more

where expertise comes together
- since 1996 -

325 views
Technical Discussions
Lirin Philip
,
VALDEL , India, Joined Sep 2019, 10

Lirin Philip

,
VALDEL ,
India,
Joined Sep 2019
10
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, 832

Anmol Birring

Consultant,
Birring NDE Center, Inc.,
USA,
Joined Aug 2011
832
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, 2

Akshay Gaikwad

NDT Inspector,
EQUATE Petrochemical Company,
Kuwait,
Joined Mar 2017
2
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 
 

Product Spotlight

High-performance Linear Phased Array Probes

Available to order from stock in a range of 5MHz – 7.5MHz and from 16 to 64 elements. Designed w
...
ith piezo-composite elements, Phoenix phased array probes provide high-resolution imaging to maximise sensitivity; accurate ultrasonic detection and sizing of defects in welds; and effective corrosion mapping. Housed in a rugged stainless steel case for on-site industrial NDT applications.
>

Ultrasonic Testing Immersion Tanks with Unmatched Scanning Features

TecScan’s non-destructive testing Ultrasonic Immersion Tanks & scanners are designed for high pe
...
rformance and demanding NDT testing applications. Our Scan3D™ line of High Precision Immersion Tanks are specifically designed for automated ultrasonic testing of complex composites parts used in aerospace and industrial applications.
>

Micro CT

nanoVoxel series has nano-scale resolution upto 500nm by using high voltage X-ray source (from 80-
...
300 kV) with micro/nano focal spot and highly sensitive flat panel detectors and unique Optical coupling detector.
>

Wireless TOFD scanner

Quick, accurate and highly reproducible welds testing. The System operates wirelessly and is compat
...
ible with any type of Windows based Laptop, Desktop or Tablet.
>

Share...
We use technical and analytics cookies to ensure that we will give you the best experience of our website - More Info
Accept
top
this is debug window