DMQ QS3 B, Руководство пользователя

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affect tests done with this instrument. Specific information on those
factors is outside the scope of this manual. When in doubt you should
always seek expert advice or refer to specific textbooks on ultrasonic
testing. Additional information can also be found on the internet and
through local government agencies as well as in technical institutes.
The QS3 operates with dual crystal transducers that use the “pitch-
catch” principal. Dual crystal transducers use two piezoelectric crystals
whereby one crystal is excited with short electrical pulses from the unit
sending short acoustic waves into the test piece. The second crystal
then receives the acoustic waves reflected at the end of the test piece.
The frequency of the acoustic waves changes between 2 and 10 MHz
depending on the probe being used.
Figure 1: Transducer acoustic wave representations