A novel type of double-crystal probe with one transmitter and multiple receivers is developed. Based on the probe with
one transmitter and one receiver, this designed probe includes one longer transmitting crystal plate and multiple
receiving crystal plates with the same length each other. These receiving crystal plates can receive respectively
ultrasound echo at the same time. We have manufactured the probe with one transmitter and three or four receivers.
Finally we carry out the integrated experiment to test the performance of probe. The testing result shows that three
receiving crystal plates have the equal effective sound beam width and uniform sound field distribution. Contrasted to
the conventional probe, the novel probe not only overcomes the disadvantage that flaw quantitative error enlarges with
the increment of transmitting crystal plate length, but also improves the dynamic coupling stability of probe at the mean
time of increasing effective sound beam width. Moreover, resolution to detect flaw near the surface is also advanced.
This type of probe can improve effectively the testing speed and flaw detection sensitivity. So the qualification of thick
steel plates' automatic inspection is also improved greatly.
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