LETTER
High temperature detection inside large-scale plants using distributed sensor fabricated by 10 LPG resonant wavelengths multiplexing
2013 Volume 10 Issue 18 Pages 20130586
Details
2013 Volume 10 Issue 18 Pages 20130586
Ten resonant wavelengths could be multiplexed successfully by writing long-period gratings (LPGs) with different pitches using a CO2 laser. A preliminary distributed temperature monitoring experiment was conducted, and it was estimated that separation between 2 adjacent resonant peaks was 13.2nm, even when the temperature difference between 2 adjacent LPGs was 150°C. This separation is large enough to distinguish the resonant wavelengths individually. The results clarified that this multiplexing approach enables the LPFG to detect a local high temperature caused by an abnormal reaction inside large-scale plants.
