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In this Special Issue of Sensors, seven peer-reviewed manuscripts appear on the topic of ultrasonic transducer design and operation in harsh environments: elevated temperature, high gamma and neutron radiation fields, or the presence of aggressive chemicals. Motivations for these research and development projects are strongly focused on nuclear power plant inspections (particularly liquid-sodium cooled reactors), and nondestructive testing of high-temperature piping installations. It is anticipated that extensive use of permanently mounted robust transducers for in-service monitoring of petrochemical plants and power generations stations; quality control in manufacturing plants; and primary and secondary process monitoring in the fabrication of engineering materials will soon be made.

PMN-PT --- neutron irradiation --- TUCSS --- L-waves --- field-deployable sensor --- structural health monitoring --- ultrasonic --- piezoelectric wafer active sensor --- nondestructive testing --- high-temperature monitoring --- FBR --- gallium phosphate --- NDT (Non Destructive Testing) --- inspection --- guided wave --- elevated temperature --- imaging --- sodium --- pressurized water reactor fuel rods --- high-temperature ultrasonic testing --- ultrasonic transducer --- dry coupling --- reactor --- lithium niobate --- non-destructive evaluation --- guided-wave send–receive --- spray-on transducers --- NDE --- piezoelectric --- harsh environment --- R --- EMAT sensor --- piezocomposites --- ISI&amp --- SFR --- NDT --- liquid sodium --- thickness shear --- Phased Array --- NDE (Non Destructive Evaluation) --- ultrasound --- high temperature --- radiation --- radiation resistance --- in-service inspection --- nuclear power plants