An efficient multiplexing method for fiber Bragg grating sensors based on a broadband mode-locked laser source and interferometric interrogation is described. The system has the capability to interrogate several hundred fiber Bragg grating sensors on a single fiber, whilst achieving sub-microstrain resolution over bandwidths greater than 100 kHz. A demonstration system with 8 sensors is presented, which achieves strain resolutions less than 213 n epsilon/Hz(1/2) up to 100 Hz.
|Name||Proceedings of the Society of Photo-Optical Instrumentation Engineers (SPIE)|
|Conference||17th International Conference on Optical Fibre Sensors|
|Period||23/05/05 → 27/05/05|
- time division multiplexing
- mode-locked laser
- fiber Bragg grating sensor
- phase-sensitive detection