Fig. 3From: Use of Higher-Harmonic and Intermodulation Generation of Ultrasonic Waves to Detecting Cracks due to Steel Corrosion in Reinforced Cement MortarSetup of the accelerated corrosion test. 1: potentiostat–galvanostat. 2: mortar specimen under test (the specimen is located on a tray with a plastic cover to keep a practically constant relative humidity environment, see text in Sect. 2.2). 3: relative humidity measurement device.Back to article page