The conventional single-ended measuring configuration has been faced with the difficultly of accurately
measuring temperature, due to ununiform attenuation distribution along the optical fiber sensor length. Loop Configuration
using double-ended measurement, in which the laser pulses are injected into the fiber cable alternately from both ends, resolves
these difficulties by automatic cancellation of the cable attenuation. Loop Configuration is, therefore, indispensable in
applications where there is high fluctuation of cable temperature, such as in fumace applications, LPG leakage monitoring
and areas of radioactibity.