Non-Destructive Measurement of Acetic Acid and Its Distribution in a Photovoltaic Module during Damp Heat Testing Using pH-Sensitive Fluorescent Dye Sensors. - Hideaki Nagasaki; Takashi Asaka; Kentaro Iwami; Norihiro Umeda; Chizuko Yamamoto; Yukiko Hara; Atsushi Masuda (Sensors, 2022)