Potential of stimulated Brillouin scattering as sensing mechanism for distributed temperature sensors

Electromagnetic Sensing Techniques for Non-Destructive Diagnosis of Civil Engineering Structures

“…Nevertheless, Raman scattering based systems do not allow performing deformation measurements. In 1989, it was reported that the frequency shift of the Stokes-Brillouinbackscattered light (the so-called Brillouin frequency shift) greatly varies with strain and temperature along the fiber (Horiguchi 1989, Culverhouse 1989. Since then, considerable attention has been paid to exploiting Brillouin scattering for distributed sensing.…”

Fiber Optic Temperature Sensors

“…At high optical pump powers, the Stimulated Brillouin scattering (SBS) is one of the most important nonlinear effects in fibers and has a significant influence on the operation of optical transmission systems as well as fiber sensors. Brillouin-based optical fiber sensors have been widely reported in recent years owing to their possibilities to perform distributed strain and temperature sensing along an optical fiber [Bao et al, 1993;Nikles et al, 1996;Culverhouse et al, 2008;Kee et al, 2002;Rathod et al, 1994]. Several techniques have been proposed for effective sensing using either spontaneous Brillouin scattering (SpBS) or stimulated Brillouin scattering (SBS) effects.…”

Brillouin Scattering Based Distributed Fiber Optic Temperature Sensing For Fire Detection

“…7 2 (8) where P 12 is the longitudinal elasto-optic coefficient, ρ is the material density and c is the light speed.…”

“…In 1995, Bao et al investigated fiber lengths as long as 51 km [11], while temperature and spatial resolutions of ±1°C and 1 m respectively have been achieved for shorter fiber lengths of 1 -3 km [9][10][11][12][13]. Although a number of scattering mechanisms have been proposed for distributed temperature sensing [6][7][8], the Brillouin scattering mechanism is thought to be most appropriate for fire detection due to its enormous potential for monitoring remote locations with increased temperature sensitivity. Fire protection specialists would benefit greatly from these advantages, so this paper presents Brillouin scattering on an experimental and theoretical level to demonstrate its suitability for fire detection.…”