Fiber Bragg Grating measurement packet and system for measuring temperature in gas turbines

A fiber Bragg grating-multi-point temperature measuring system (44) includes a fiber sensing cable pack (52) and a plurality along an inner surface of a wall in circumferential direction distributed clamping devices (50) for securing the fiber sensing cable package. The fiber sensing cable package comprises a system based on a fiber Bragg grating sensor cable (53), the at least one optical fiber (12), a plurality of inscribed in the optical fiber Bragg grating (14) and a fabric layer (18) and the optical fiber which surrounds the cladding tube (16). The multi-point fiber sensing system comprises a light source for transmitting light to the Bragg grating and a reflected light receiving detector module. Each clamping device comprises at least one radiation-T-piece (54) and defines at least one mounting hole (58) for securing the fiber sensing cable.