Monitoring Hydrogen and Methane Gases in Transformer Oil Using Palladium and Polydimethylsiloxane Coated Fiber Bragg Grating Sensors. - Folad Fawad; Supakit Chotigo; Apichai Bhatranand; Sarayut Yongprapat; Sanguan Anantathanasarn; Rattanaporn Suksomboon (IEEE Access, 2025)