Micro-sensing optical unit and embedded application thereof

Abstract

The invention relates to a micro-sensing optical unit which is embedded inside or outside a cable, comprises a micro-sensing optical unit body and is characterized in that the micro-sensing optical unit body comprises an optical fiber for sensing, wherein a sealed stainless steel pipe is coated outside the optical fiber for sensing, and water-blocking fiber paste is filled in the stainless steel pipe; the number of the optical fiber for sensing can be 1 or two or plural, and the fiber excess length range in the stainless steel pipe is that the excess length is not less than 0 and less than 0.03%. The invention further relates to a cable, an optical cable, an aerial bare line and a submarine cable applying the structure in an embedded manner. The micro-sensing optical unit has high sensitivity to measured information of outside and can respond to temperature and strain in real time, the embedding process is simple and does not change the original performances of the optical cable, the temperature change can be reflected in a real-time manner, the smaller fiber excess length in the pipe can reduce the region of a stress and strain window of the optical fiber, the sensitivity to external stress (strain) reaction of the optical fiber can be improved, and the micro-sensing optical unit can not change the original structure and the performances of the optical cable and be embedded in the appropriate part of the optical cable and the cable.

Description

technical field

[0001] The invention relates to distributed on-line measurement and sensing of optical fibers, in particular to a micro-shaped sensing light unit and embedded cables, optical cables, overhead bare wires and sea cables using the structure. Background technique

[0002] Optical fiber sensing technology is a new type of sensing technology that uses light as the carrier and optical fiber as the medium to perceive external information. Using various characteristics of optical fiber, optical fiber can be made into various sensors, but it is distributed in points in space. In addition to the discontinuous measurement points, additional transmission lines (optical cables or cables) are required.

[0003] The distributed optical fiber measurement sensing system can provide the measured information in the form of a continuous function of distance over the continuous length of the entire optical fiber. Used to detect the transmission of information. In recent years, o...

Images