| 摘要 |
A high-durability and long-scale-distance fiber grating sensor and a manufacturing method therefor, which relate to the technical field of fiber grating sensors. A fiber grating is disposed on the middle segment of a commercial optical fiber. A bushing, a woven fiber jacket layer, and a packaging structure are disposed on the periphery of the commercial optical fiber. The commercial optical fiber and the bushing therebetween are fixed by using fixing points in the bushing. Anchoring segments are disposed between the fixing points in the, bushing and the woven fiber jacket layer. Two ends of the commercial optical fiber are sequentially connected to optical fibers on the anchoring segments and connecting optical fibers. Tail ends of the connecting optical fibers are connected to a transmission cable by using connecting flanges. By using the apparatus and the manufacturing method, the applicability and the durability of application of the fiber grating sensor in the civil traffic engineering field are improved, thereby providing a stable and reliable apparatus for long-time detection and sound monitoring of large engineering structures in the civil traffic engineering field. |
| 主权项 |
1. A manufacturing method for a long gauge Fiber Bragg Grating (LG-FBG) with high-performance, long lifetime and long gauge length and suitable for an area distributed or all areas distributed sensing and monitoring in large-scale civil and transportation structures, comprising the following steps:
Selecting: first, centering on the fiber Bragg grating and measuring out half sensing gauge length in both sides, and then determining the gauge length as AB, stripping off the coating layer of an optical fiber segment via an optical fiber coating stripping and packaging device, cleaning the optical fiber segment with acetone or ethanol and then packaging the optical fiber segment again via variable elastic modulus material; then, threading the optical fiber segment through a bushing within the range of the sensing gauge length via a bushing threading device, and fixing the two ends of a fiber Bragg grating sensor to the end A and B of the bushing via a variable elastic modulus resin, wherein the fixing segment length is l0; manufacturing: fusion-splicing individual LG-FBG sensors with long lifetime, high-precision, and long gauge length to form a serial connection, enwinding the optical fiber of distributed inscribed optical gratings or optical fiber of distributed fusion-spliced LG-FBG sensors on a reel drum, for continuous packaging of the distributed optical fiber sensors; under the traction of a traction and product collecting device, the reel drum unreels the optical fiber serially connecting with fiber Bragg gratings at a specific speed automatically; removing the coating layer at fixing points in the bushing and on the anchoring segment automatically by an optical fiber coating stripping and packaging device, and packing the optical fiber with modified epoxy resin for anti-slip packaging; mounting bushings in bushing length (L+2l0) by the bushing threading device, controlling the tension strain of the optical fiber by an optical fiber tension strain control device, and fixing both ends of the optical fiber to the bushing by fixing devices in the bushing; unreeling a fiber for packaging from a fiber spool, and then weaving a basalt fiber-reinforced jacket layer outside of the bushing and a commercial optical fiber in one way or two ways by a braiding machine, impregnating the anchoring segment with a modified epoxy resin by a resin impregnator device for anchoring segment, and impregnating the other parts with another type of modified epoxy resin; curing by a drying device in a vacuum environment, and fusion-splicing optical cables on both ends of the LG-FBG sensors and collecting the product on the traction and product collecting device for standby use; wherein the entire process is controlled by an intelligent production control system. |
