An exploratory study on the temperature and strain sensor based on weak long period grating (LPG) and fiber ring is presented. This fiber ring-down (FRD) device consists of two matched fiber Bragg gratings, a section of single mode fiber, a weak long period grating, a pulsed laser source and a photodiode. The weak long period grating inserted in fiber ring cavity is used as sensing element which will cause additional loss is cavity. By measuring the fiber ring-down time in time domain, the temperature (0-100°C) and strain (0-l000με) sensing characteristics on weak long period grating are achieved. The demodulation wavelength range is 10 nm.
|Publication status||Published - 1 Sep 2007|
- Cavity ring down (CRD)
- Fiber ring down (FRD)
- Long period grating (LPG)