High relative humidity measurements using gelatin coated long-period grating sensors

• Main Authors: Tan, Khay Ming, Tay, Chia Meng, Tjin, Swee Chuan, Chan, Chi Chiu, Rahardjo, Harianto
• Other Authors: School of Civil and Environmental Engineering
• Format: Article
• Language: English
• Published: 2011
• Subjects: DRNTU::Engineering::Civil engineering::Geotechnical; DRNTU::Engineering::Electrical and electronic engineering::Optics, optoelectronics, photonics
• Online Access: https://hdl.handle.net/10356/94519; http://hdl.handle.net/10220/7337
• Institution: Nanyang Technological University

A long-period grating (LPG) coated with gelatin was developed as a high relative humidity (RH) sensor. The resonance dip or coupling strength of the LPG spectrum varies with RH. Experimental investigations on the sensor yield a sensitivity of 0.833%RH/dB with an accuracy of ±0.25%RH, and a resolutio...