Abstract: Disclosed is a piezoelectric transducer which is mounted to a target in use, comprising: a piezoelectric element having a front face which faces the target, and an opposing rear face which faces away from the target, wherein the piezoelectric element has a first acoustic impedance; an compression element located on the rear surface side of the piezoelectric element, the compression element having a second acoustic impedance which is less than the first acoustic impedance; and, a compression mechanism which urges the compression element towards the piezoelectric element such that the compression element is compressed between the compression mechanism and piezoelectric element.