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 -

1071 views
Technical Discussions
Theodoros Theodoulidis
Teacher, Researcher
University of Western Macedonia, Greece, Joined Dec 1999, 5

Theodoros Theodoulidis

Teacher, Researcher
University of Western Macedonia,
Greece,
Joined Dec 1999
5
09:10 Jun-20-2000
ID pit sizing

I am looking for updated information about sizing of ID pits with eddy currents in heat exchanger tubing.

I have seen a report referring to a reverse frequency mix of two frequencies. This is an artificial way of enhancing the 40 degrees angle between the wobble signal and the holes signal and is supposed to increase the above angle to 90 degrees. Does anyone know what exactly is reverse mix?

Thank you in advance



 
 Reply 
 
Richard D. Roberts
Engineering, Executive Managment
Quest Integrity Group, USA, Joined Nov 1998, 78

Richard D. Roberts

Engineering, Executive Managment
Quest Integrity Group,
USA,
Joined Nov 1998
78
00:52 Jun-24-2000
Re: ID pit sizing
gle to 90 degrees. Does anyone know what exactly is reverse mix?

: Thank you in advance




 
 Reply 
 
James Doyle
James Doyle
02:19 Jul-21-2000
Re: ID pit sizing
: I am looking for updated information about sizing of ID pits with eddy currents in heat exchanger tubing.

: I have seen a report referring to a reverse frequency mix of two frequencies. This is an artificial way of enhancing the 40 degrees angle between the wobble signal and the holes signal and is supposed to increase the above angle to 90 degrees. Does anyone know what exactly is reverse mix?

: Thank you in advance


Also see www.visualogic.com

Good luck,

Jim Doyle


 
 Reply 
 
John Hansen
Director, - Eddy Current Technology
ETher NDE Ltd, United Kingdom, Joined Oct 1999, 74

John Hansen

Director, - Eddy Current Technology
ETher NDE Ltd,
United Kingdom,
Joined Oct 1999
74
04:01 Aug-09-2000
Re: ID pit sizing
I guess a reverse mix is to take the data from two channels at different frequencies and then instead of removing an unwanted signal add together the siganl you want. How this is done to maintain sensititvity is a ggod question. You could double the height of the through hole and leave the wobble the same by for instance using two channels at the same frequency set the hole to 90 degrees in both, then conpletely attenuate the x axis on one and then add together both signals and then rotate the hole to 40 degrees.

You could also mix the wobble out in this way.

At the EPRI BOP conference in Scottsdale EPRI reported that the most reliable method they had found for depth sizing ID pitting was to use the max Y amp i.e. ignore wobble and phase.

Which if you think about it is much the same as the reverse mix.

Regards


John Hansen
Hocking NDT Ltd
: : I am looking for updated information about sizing of ID pits with eddy currents in heat exchanger tubing.

: : I have seen a report referring to a reverse frequency mix of two frequencies. This is an artificial way of enhancing the 40 degrees angle between the wobble signal and the holes signal and is supposed to increase the above angle to 90 degrees. Does anyone know what exactly is reverse mix?

: : Thank you in advance

:
: Also see www.visualogic.com

: Good luck,

: Jim Doyle




 
 Reply 
 

Product Spotlight

Research Center IDEKO develops an ultrasonic train wheel inspection system for CAF

The Basque Research centre IK4-IDEKO has developed a state-of-the-art ultrasonic inspection system f
...
or the train wheel. This system secures a sound condition of train wheels and is thus a significant contribution to rail transport safety. The device was delivered to CAF recently and its use allows the manufacturer to become an approved supplier of rolling stock in Italy, as it meets the demanding homologation standards of this country. \\\\r\\\\n
>

NEW - TD Focus-ScanRX

The NEW Next Generation Advanced UT platform, TD Focus ScanRX - Also available as a card stack solut
...
ion. Key Improvements 1. Data acquisition is significantly faster than current design 2. Better aesthetic – closely aligns with HandyScan RX 3. Improved IP rating (Target IP66) 4. Ruggedized housing 5. Connectors are protected from impact and ingress 6. Integrated stand and separate retractable handle easy to keep clean) 7. Touchscreen with ruggedized display glass 8. 3-Axis encoder input
>

Compact NDT inspection-heads for measurements with active thermography

The compact inspection head is suitable for thermographic ndt tasks. The uncooled infrared camera
...
is specially developed for NDI-tasks and offers a thermal sensitivity until now known only from thermal imagers with cooled detector. All required components and functions are integrated into the inspection-head. You will only need an ethernet cable to connect the sensor with the evaluation system.
>

YXLON Cougar EVO

Scalable small footprint X-ray inspection systems for assembly and laboratory applications. The
...
YXLON Cougar EVO series was designed to provide the "best-in- class" inspection solutions for SMT, semiconductor, and laboratory assembly applications, while maintaining a small system footprint for maximum convenience. With optimized software and hardware, these systems produce higher quality and more consistent results than other electronics inspection systems currently on the market.
>

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