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Technical Discussions
djamel12
NDT Inspector,
Canada, Joined Feb 2015, 5

djamel12

NDT Inspector,
Canada,
Joined Feb 2015
5
18:26 Feb-27-2015
range in thickness measurement

Does any one know about out of range in thickness measerment

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

Tom Nelligan

Engineering,
retired,
USA,
Joined Nov 1998
390
22:47 Feb-27-2015
Re: range in thickness measurement
In Reply to djamel12 at 18:26 Feb-27-2015 (Opening).

Typically "out of range" in ultrasonic thickness gaging means one of the following:

(a) The echoes from a distant reflector are too small to measure with a given transducer/instrument/setup combination. This is the most common meaning.

(b) The time interval to the reflector is longer than the digitizing window of the instrument and thus the echo is not detected even if it is large. This is usually a function of instrument design.

(c) With delay line transducers, the time interval to the reflector is longer than the time interval represented by the delay line.

    
 
 
john
john
23:35 Feb-27-2015
Re: range in thickness measurement
In Reply to djamel12 at 18:26 Feb-27-2015 (Opening).

out of range pertaining to UTT: calibration thicknesses not in the range of part thicknesses. IE: part is .450" thick but you calibrated on the .200" & .400" steps. you are out of range & and the calibration should not be considered valid for the thickness readings taken.

    
 
 

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