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- since 1996 -
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Technical Discussions
Roberto Carlos Giacchetta
Roberto Carlos Giacchetta
05:24 Sep-04-2006
TOFD Hyperbolic cursor

Does anyone know how to draw the Hyperbolic cursor to minimize the error in the depth calculation from a TOFD inspection?

thanks Roberto from IAI CSIC Spain

David Mackintosh
Engineering,
Acuren Group Inc., Canada, Joined Feb 2011, 85

David Mackintosh

Engineering,
Acuren Group Inc.,
Joined Feb 2011
85
00:00 Sep-06-2006
Re: TOFD Hyperbolic cursor

----------- Start Original Message -----------
: Does anyone know how to draw the Hyperbolic cursor to minimize the error in the depth calculation from a TOFD inspection?
: thanks Roberto from IAI CSIC Spain
------------ End Original Message ------------

The equation, if I have uploaded it properly, should appear above. The equation is based on both the defect and the send-receive pair centered on the weld.
C = wave velocity
t = time
y = scan position
d = depth of defect (point-scatterer)
Transmitter position is S

Source: Engineering Applications of Ultrasonic Time-of-Flight Diffraction, 2nd ed., J. P. Charlesworth and J. A. G. Temple, Research Studies Press, 2002, sec 2.3.4 page 39

(Please read the book yourself before you base any important work on this information!)

David Mackintosh
Engineering,
Acuren Group Inc., Canada, Joined Feb 2011, 85

David Mackintosh

Engineering,
Acuren Group Inc.,
Joined Feb 2011
85
02:10 Sep-06-2006
Re: TOFD Hyperbolic cursor
----------- Start Original Message -----------
: Does anyone know how to draw the Hyperbolic cursor to minimize the error in the depth calculation from a TOFD inspection?
: thanks Roberto from IAI CSIC Spain
------------ End Original Message ------------

Back-up to picture in previous response:
Equation is
(C^2 * t^2)/(4 * k^2)  y^2 / k^2 = 1,
where k^2 = S^2 + d^2

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