抄録
We simultaneously monitored active corrosion under the insulation by using acoustic emission technique and humidity measurement. AE was produced by rust fracture induced by progression of corrosion. Humidity measurement was carried out with hydrophilic polymer coated plastic fiber. As optical index of the polymer depends on the humidity, transmitting light energy was changed by outside humidity. The sensor could be used to measure humidity of 65 to 95 %RH at 70℃. We monitored active corrosion under the insulation under wetting and drying cycle. Most AE signals were produced by the drying process in each cycle. Source locations of AE signals agreed well with corrosion area.
