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Technical Discussions
Chien
Chien
02:11 Aug-30-2005
Problem in starting UT

Hi all,
I just began learning ultrasound testing on plate. My setup consists of two angle beam transducer at similar central frequency but different specifications e.g. different impedance between the two of them, a Tektronix Oscilloscope and Tektronix Arbitrary Function Generator that is capable of producing a 160 kHz pulse. I attached a T-connector at channel 1 of the function generator so that I can connect both the transmitting transducer and the oscilloscope to that channel to observe the transmitted wave. What happened was that as soon as I connected the transducer to the T-connector (after the oscilloscope was connected), I noticed a change in the waveform from pulse shape to sine wave-shape and the amplitude greatly reduced. My first guess is the impedance mismatch between the transducer and the oscilloscope. But, I couldn't find any solution to this. Any suggestion?


 
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