A New Single Ended Calibration Approach of Fiber Optic Based Linear Type Temperature Sensor for Tunnels

With the widespread use of fiber optic-based distributed sensing technology, many application areas such as temperature detection, leak detection, conveyor temperature monitoring, fire detection in tunnels and passages, temperature monitoring have emerged. Calibration procedures are required in order to convert the signals obtained in these Raman-based systems to absolute temperature and to obtain high sensitivity. In this study, the calibration algorithms of a linear type temperature sensor that detects the temperature with Raman scattering developed for temperature monitoring and fire detection in tunnels and passages are performed. In addition, some filters have been applied to reduce signal noise.