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Technical Discussions
John Pursley
R & D
Envision Product Design, USA, Joined Oct 1999, 23

John Pursley

R & D
Envision Product Design,
USA,
Joined Oct 1999
23
01:01 Oct-28-1999
ice thickness measurement

We are looking for an inexpensive means of measuring the approximate thickness of ice floating on water by contact ultrasonics.
We assume a low frequency will be required to avoid air pocket and other anomolies other than the ice/water interface.
Any advise would be appreciated.


    
 
 
Paul A. Meyer
R & D,
GE Inspection Technologies, USA, Joined Nov 1998, 47

Paul A. Meyer

R & D,
GE Inspection Technologies,
USA,
Joined Nov 1998
47
01:36 Oct-28-1999
Re: ice thickness measurement
Hi John,
I don't understand you assumption that you need a low frequency test. Is it because of possible porosity in the ice? Can you detail the situation further?
Thanks,
Paul

: We are looking for an inexpensive means of measuring the approximate thickness of ice floating on water by contact ultrasonics.
: We assume a low frequency will be required to avoid air pocket and other anomolies other than the ice/water interface.
: Any advise would be appreciated.




    
 
 
Tom Nelligan
Engineering,
retired, USA, Joined Nov 1998, 390

Tom Nelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
02:33 Oct-28-1999
Re: ice thickness measurement

: We are looking for an inexpensive means of measuring the approximate thickness of ice floating on water by contact ultrasonics.
: We assume a low frequency will be required to avoid air pocket and other anomolies other than the ice/water interface.
: Any advise would be appreciated.

We have applications experience in this area, both serious (measuring thickness of ice over water in situations where vehicles need to drive across it) and for fun (some of my associates play ice hockey on the river behind our building during the winter, and they use one of our standard instruments to measure the ice thickness before venturing out!).

Air bubbles and striations can indeed be a problem, which is why we normally use an instrument with a waveform display, either a flaw detector or a waveform display thickness gage. A trained operator can usually distinguish these scatter echoes from the bottom surface echoes, and adjust blanking so that the correct echo is read. Transducer frequency normally rangesfrom 2 MHz down to 500 KHz for thicknesses up to several hundred millimeters.

--Tom Nelligan




    
 
 
John Pursley
R & D
Envision Product Design, USA, Joined Oct 1999, 23

John Pursley

R & D
Envision Product Design,
USA,
Joined Oct 1999
23
09:31 Oct-29-1999
Re: ice thickness measurement
: Hi John,
: I don't understand you assumption that you need a low frequency test. Is it because of possible porosity in the ice? Can you detail the situation further?
: Thanks,
: Paul

: : We are looking for an inexpensive means of measuring the approximate thickness of ice floating on water by contact ultrasonics.
: : We assume a low frequency will be required to avoid air pocket and other anomolies other than the ice/water interface.
: : Any advise would be appreciated.
------------------------

Hi Paul,
Thanks for your response.  Yes, porosity in the ice and density gradiants
caused by overflow/refreezing is the concern. 
To further detail the situation: we (Envision Product Design) design and
manufacture intelligent pipeline crawlers and radioscopic imaging tools used
primarily for corrosion inspection of in-service pipelines. You may want to
check out our web site: www.envisionprototypes.com
We have for several years had a mentorship program operating with a small
select group of local highschool honors students.  One of our mentorship
students would like to put a simple tethered robotic crawler together for
crawling out onto and testing the thickness of ice on outdoor ponds here in
Alaska.
We are familiar with the available industry UT tools for quantitative
thickness measurements, however this project calls for a low-cost, I should
say very low cost solution.  Maybe too low cost for UT, but we thought we
would check it out.
Hope this helps clarify, Thanks again,
John Pursley



    
 
 
corky
corky
07:48 Nov-24-2000
Re: ice thickness measurement
:
: : We are looking for an inexpensive means of measuring the approximate thickness of ice floating on water by contact ultrasonics.
: : We assume a low frequency will be required to avoid air pocket and other anomolies other than the ice/water interface.
: : Any advise would be appreciated.

: We have applications experience in this area, both serious (measuring thickness of ice over water in situations where vehicles need to drive across it) and for fun (some of my associates play ice hockey on the river behind our building during the winter, and they use one of our standard instruments to measure the ice thickness before venturing out!).

: Air bubbles and striations can indeed be a problem, which is why we normally use an instrument with a waveform display, either a flaw detector or a waveform display thickness gage. A trained operator can usually distinguish these scatter echoes from the bottom surface echoes, and adjust blanking so that the correct echo is read. Transducer frequency normally ranges from 2 MHz down to 500 KHz for thicknesses up to several hundred millimeters.

: --Tom Nelligan





    
 
 

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