GE USLT Series Brochure
Contents
1. GE Inspection Technologies Ultrasonics Krautkramer Software Program Module FFT for the characterization of material and reflector properties gt a Krautkr mer USLT 2000 ersion 2 1 1 File Job View Setup Report Help S Of ulialu aJAls Gain iat ea Frequency spectrum dB Step 0 5dB Actual jes 50ns 100ns 150ns 200ns 250ns A B 110 w I 90 80 70 60 50 3 0 z Freeze Range 3 mm 100 10 lp 100 63 27 Delay 0 mm 0 10 1000 Reference Record Magnify Compare 10hH2 20hMHz 30hMHz Threshold d 6 0 dB 0 15 ps Peak frequency 18 4 MHz Impuls width 17 38 MHz 71 50 Center frequency Band width Center frequency 17 38 MHz Band width 71 5 h 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 GElnspectionTechnologies com AGFA lt2. amp NDT HOCKING Krautkramer SEIFERT 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 e in materials testing on metals metall urgical properties e in materials testing on plastics embrittlement consistence matrix characterization of composite materials e in medical applications mineral con tent of bones or osteoporosis e in foodstuff control detection of sedimentation gelation impurities temperature effect GE imagination at work 2004 General Electric Company All rights reserved GEIT 20036GB 09 04 We reserve the right to technical modifica
3. tions without prior notice
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