Pressure-sensitive optical cable and manufacture method thereof

Abstract

The invention discloses a pressure-sensitive optical cable and a manufacture method thereof. The pressure-sensitive optical cable consists of two toothed plates made of a flexible material, and a polymer sheath tube sheathing the toothed plates, wherein the deformed teeth on the two toothed plates correspond to each other in a staggered manner; and a signal fiber is sandwiched by the deformed teeth of the two toothed plates. When a pressure is applied on the pressure-sensitive optical cable, the deformed teeth of the two toothed plates make relative movement so that the signal fiber generates bending deformation, thereby changing the bending loss of the signal fiber. Therefore, the pressure signal is converted into an optical signal, and is transmitted by the signal fiber to achieve the distal measurement. The toothed plate made of a flexible material has certain bending property, which can facilitate the manufacture, storage, transportation and use of the pressure-sensitive optical cable. Similar to the common optical cable, the pressure-sensitive optical cable has greatly reduced manufacture and use cost, and does not influence the pressure detection. The pressure-sensitive optical cable has the advantages of simple structure, reasonable design, convenience in manufacture, flexible use manner, high sensitivity and good use effect, and can achieve the distributed pressure measurement by use of measurement instruments, such as optical time-domain reflectometer.

Description

technical field [0001] The invention relates to an optical cable for pressure sensing, in particular to an optical cable for pressure sensing using the micro-bend loss of an optical fiber. Background technique [0002] There are many methods for measuring pressure in traditional pressure sensors, such as strain gauge measurement, optical measurement, Hall effect measurement, grating ruler measurement and so on. However, many current measurement methods are not conducive to remote measurement and monitoring, especially due to the interference of strong external electrical signals, serious distortion of remote transmission, complex measurement mechanism, poor reliability, and unfavorable maintenance. In addition, for flammable and explosive environments, all methods of using electrical measurement are not suitable, because any spark may cause serious fire or explosion accidents, causing immeasurable losses. The optical fiber stress sensor has many advantages and has attracted...

AI Technical Summary

Problems solved by technology

[0004] Chinese invention patent CN87107210 discloses a "microbending optical fiber strain gauge", which uses two plates with opposite, mutually staggered corrugated surfaces, and a signal optical fiber sandwiched between the two plates to achieve stress Sensing, its disadvantage is the use of two rigid boards, which limits the use of the fiber optic sensor, when it needs to be used in a large range and long distance, its production, packaging, transportation, and use are more difficult, so it is not necessary Facilitate cost reduction and mass production

Images