Distributed optical fiber temperature-measurement system for high-temperature pipeline group

A distributed optical fiber temperature measurement system for a high-temperature pipeline group, comprising an upper computer, a data transmission line, a laser emitting apparatus, a wavelength division multiplexing device, a photoelectric detector, a high-speed data acquisition card, and sensing temperature-measurement optical fibers;

• a stainless steel capillary tube is provided outside each sensing temperature-measurement optical fiber;
• wherein the optical fibers are placed in the stainless steel capillary tube, and are shaped by optical fiber shaping frames to form a single-optical-fiber multi-path back-and-forth zigzag structural form matched with a plurality of high-temperature pipelines in a single row;
• the back-and-forth zigzag form comprises a plurality of columns of straight line sections and arc connecting sections between every two adjacent columns of straight line sections;
• the straight line sections are shaped to be straight and fixed in length by the optical fiber shaping frames, the straight line sections are equal in length, and the arc connecting sections are equal in length;
• and the sensing temperature-measurement optical fibers are communicated from one end of the multi-path back-and-forth zigzag form to the other end, and the straight line sections are fixed on different parallel high-temperature pipelines one by one by means of the stainless steel capillary tubes on the outer sides of the straight line sections;
• the optical fibers are shaped by an optical fiber shaping frame to be an integral multiple of (L0+L1/2) to (L1+L2);
• wherein, L0 is the length of a single-path optical fiber connected to the starting position of an optical fiber straight line section corresponding to a first high-temperature pipeline by a wavelength division multiplexing device, L1 is the length of the optical fiber straight line section, and L2 is the length between the tail end of the previous optical fiber straight line section and the starting point of the next optical fiber straight line section in the same row;
• the optical fiber shaping frame is provided with a back-and-forth zigzag positioning groove matched with the stainless steel capillary tube;
• the back-and-forth zigzag positioning groove includes a plurality of columns of linear positioning grooves, and arc connecting positioning grooves between two adjacent columns of linear positioning grooves at the front and rear, and the spacing between the linear positioning grooves corresponds to the spacing between every two adjacent high-temperature pipelines;
• and the cross section size of the positioning groove meets the requirement that part of the stainless steel capillary tube can be embedded.