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Technical Discussions
Ravi.C
NDT Inspector
Regional Engineering collage, India, Joined Sep 2003, 2

Ravi.C

NDT Inspector
Regional Engineering collage,
India,
Joined Sep 2003
2
05:59 Sep-02-2003
Remote field eddy current testing

How to prepare probe for testing SA192 boiler tubes( 4.5 mm thick)? I have used 800 and 400 turns for exciter and receiver respectively with 3 times of the tube dia as a distance between the coils. But I am not able to get expected signal. Please tell me your suggestion on the same.


 
 Reply 
 
Thirunavukkarasu
R & D,
Indira Gandhi Centre for Atomic Research, India, Joined Sep 2003, 2

Thirunavukkarasu

R & D,
Indira Gandhi Centre for Atomic Research,
India,
Joined Sep 2003
2
02:19 Sep-09-2003
Re: Remote field eddy current testing
----------- Start Original Message -----------
: How to prepare probe for testing SA192 boiler tubes( 4.5 mm thick)? I have used 800 and 400 turns for exciter and receiver respectively with 3 times of the tube dia as a distance between the coils. But I am not able to get expected signal. Please tell me your suggestion on the same.
------------ End Original Message ------------

Dear Mr. Ravi,

The receiver coil must be kept at remote field zone, Which you can find experimentally by moving the receiver coil. The distance need not be three times the ID of the tube. It may be more or less. Moreover you detection sensitivity largely depends on the instrumentation. Since the flux linkage in the receiver coil is very small the induced voltage will be of the order of micro/nano volts. It would be better if you use lock-in amplifier for the measurement of such voltages.


regards,
arasu


 
 Reply 
 
Dana Ives
Engineering
CoreStar International Corp., USA, Joined Jan 2003, 10

Dana Ives

Engineering
CoreStar International Corp.,
USA,
Joined Jan 2003
10
04:48 Sep-12-2003
Re: Remote field eddy current testing
----------- Start Original Message -----------
: : How to prepare probe for testing SA192 boiler tubes( 4.5 mm thick)? I have used 800 and 400 turns for exciter and receiver respectively with 3 times of the tube dia as a distance between the coils. But I am not able to get expected signal. Please tell me your suggestion on the same.
: Dear Mr. Ravi,
: The receiver coil must be kept at remote field zone, Which you can find experimentally by moving the receiver coil. The distance need not be three times the ID of the tube. It may be more or less. Moreover you detection sensitivity largely depends on the instrumentation. Since the flux linkage in the receiver coil is very small the induced voltage will be of the order of micro/nano volts. It would be better if you use lock-in amplifier for the measurement of such voltages.
:
: regards,
: arasu
------------ End Original Message ------------

Mrrs. Ravi and Arasu,
There is a direct correlation between induced voltage and the wire properties as well as the number of turns. A lock-in amp may help amplify the signal from the receiver(s), but I would think it would also amplify the inherent wire noise. Thus your S/N ratio may be inferior.


 
 Reply 
 
Ravi C
NDT Inspector
Regional Engineering collage, India, Joined Sep 2003, 2

Ravi C

NDT Inspector
Regional Engineering collage,
India,
Joined Sep 2003
2
02:21 Oct-01-2003
Re: Remote field eddy current testing
Dear Dana Ives
I used 800 turns in exciter mode and 400 turns in receiver mode. I need a details on selection of number of turns and technology behind it. Suggest me some article related on preparation RFECT probe.


 
 Reply 
 
Nanotechnology Products
Nanotechnology Products
02:59 Feb-28-2004
Nanotechnology Products
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 Reply 
 
Theo van Embden
Theo van Embden
04:43 Mar-24-2004
Re: Nanotechnology Products
----------- Start Original Message -----------
: nanotechnology nanotechnology nanotechnology nanotechnology productsHave you been looking at nanotechnology lately? The investments and products are really picking up. Major investments too! Checkout NanoXchange or nanoxchange.com - For Nanotech Products like materials and electronics on the nanoscale - Nanotechnology and MEMS also Nanotech Companies Its a great resource for lots of products from different nanotech companies like zyvex and Altair and catagories like nanomaterials and nanoelectronics the list goes on and on you should check it out.
------------ End Original Message ------------




 
 Reply 
 

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