GE USLT Series Brožura stáhnout pdf

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A PLUS for the USLT 2000

The software program FFT is an additional

module for the ultrasonic test system

USLT 2000 that can be easily installed

as an optional „Plug-In“. This additional

software extends the range of functions

of the USLT 2000; new ﬁelds of applica-

tion are opened up.

In combination with the modern com

puter technology and the FFT method

(Fast Fourier Transform), a fundamental

method of signal processing, ultrasonic

signals can also be displayed and evalu-

ated online within the frequency range.

This spectrum analysis is used for the

nondestructive characterization of mate-

rial and reﬂector properties.

Krautkramer SoftwareProgram

Module FFT

... for the characterization of material and reﬂector properties

The method

The method makes use of the fact that

every ultrasonic echo is a convolution

product of the properties of the acoustic

transducer, of the material, and of the re-

ﬂector, among other things. If the frequency

spectrum of an acoustic transducer is

known - which can likewise be determined

by means of the program -, the frequency

shift measurement enables conclusions to

be drawn with regard to the reﬂector and

the material.

The FFT software shows the A-scan’s

frequency spectrum in the right-hand

section of the window. The evaluation

parameters are displayed below it: for

the time signal the pulse duration, for

the frequency spectrum the peak and

center frequency, and the bandwidth.

The applications

In addition to the reﬂector characteriza-

tion - for example the distinction between

ﬂat or planar and curved reﬂectors - the

FFT module makes a material characteri-

zation possible, for example:

• in materials testing on metals: metall

urgical properties

• in materials testing on plastics:

embrittlement, consistence, matrix

characterization of composite

materials

• in medical applications: mineral con

tent of bones or osteoporosis

• in foodstuff control: detection of

sedimentation, gelation, impurities,

temperature effect

Krautkramer SoftwareProgram 1

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Strany 1 - Krautkramer SoftwareProgram

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