Coaxial dual-arc-surface non-through type gas based line focusing air coupling sensor

The invention relates to a coaxial dual-arc-surface non-through type gas based line focusing air coupling sensor, and belongs to the technical field of acoustic transducers. The coaxial dual-arc-surface non-through type gas based line focusing air coupling sensor is used for converting electric signals generated by an excitation end into vibration of a piezoelectric material to generate ultrasonic waves, meanwhile receiving acoustic wave signals reflected back from a tested piece and converting the acoustic wave signals into electric signals. A coaxial dual-arc-surface non-through type gas based piezoelectric composite is adopted as an excitation receiving sensitive element and is combined with an upper electrode, a lower electrode, a transmission layer, a backlining layer, an impedance matching circuit, a metal shell, a BNC connector and the like to form the coaxial dual-arc-surface non-through type gas based line focusing air coupling sensor. The sensor has the beneficial effects of being low in acoustic im