Method for monitoring of tightness in channels of international cable ductwork of fibre optic transmission line

FIELD: metering equipment.

SUBSTANCE: invention is related to metering equipment and is aimed at expansion of application field. This result is provided due to the fact that in process of monitoring over tightness in channels of international cable ductwork of fibre optic line for transmission to optic fibre with specified interval, fibre optic moisture meters are connected serially, characteristic of back scattering in this optic fibre is measured at one of its ends, and its variances in sections that correspond to areas of fibre optic detectors location are used to assess moisture in areas adjacent to detectors. At the same time in sight devices of internal cable ductwork of fibre optic transmission line, from connecting couplings of optical communication cable, optical fibre of optic communication cable is taken out, where fibre optic moisture detectors are connected, which are placed in channels of international cable ductwork of fibre optic transmission line from the side of sight devices, then characteristic of this optic fibre back scattering is measured in optical communication cable from one of its ends, and its variances are used to monitor tightness of channels in international cable ductwork of fibre-optic transmission line.

EFFECT: expanded field of application.

1 dwg

 

The invention relates to measuring technique and can be used to control the tightness of channels (lines) long distance cable duct (ICC) fiber-optic transmission line (fotl).

There is a method /1/ determine the distance to the place of leakage in long products, in particular electrical cables. This is ensured by the fact that the determination of the distance to the point of leakage in long products, under gas pressure, is carried out by measuring the flow rate and pressure drop of the gas in the sealed product in an ex parte filing of gas and then determine pneumonologist products by the formula depending on the ratio of the volume of gas flow on the length between the ends of the product to a pressure drop at the ends of the product. Then measure the flow rate and the gas pressure at the ends of the leaking of the product and determine the distance to a leak on a formula that takes into account the distance to leakage from the first end of the product volumetric flow rate of gas fed to the product respectively through the first and second ends, the gas pressure respectively on the first and second ends of the product and pneumonologist sealed products. This method is applicable, if lengthy product is contained under pressure. However, the ICC is od pressure not contain because it requires a very large cost.

There is a method /2/ control the state of the external insulating cover communication cables, which consists in the fact that along the cable at a given distance from each other in the joint construction of the lengths of cable will be equipped with measuring and control points (KIP)on the flap which output wire connected to the metal covers of the cable and the ground loop. Then during the lifetime of the cable line periodically go round the track, make measurement of the insulation resistance of the metal covers of the cable relative to the earth, on which to assess the condition of the outer insulating cover of the cable connection. For cables installed in the pipeline, the results of measuring insulation resistance of metal elements relative to the earth not allow us to detect and correctly assess the degree of leakage in pipelines.

There is a method /3/ humidity control in extended structures, which consists in the fact that along the buildings are laid special cable, optical fiber (S) with the specified interval consistently include fiber optic sensors (WATER) humidity. During operation of the facility from one end of the cable is measured characteristic backscattering this is IMPRESSIVE and it changes on the sites corresponding to the location of optical fiber humidity sensors measure humidity in the adjacent sensor regions, above which a given level is determined by the leakage. However, this method requires installation in the pipeline together with the communication cable of the above special cable that, given the large distances between the observation device IWC - up to 2.0 km, is associated with considerable difficulties and in many cases not feasible.

The essence of the invention is the expansion of the scope.

This entity is achieved by the fact that according to the method of monitoring the integrity of long-distance channels cable duct optical fiber transmission line in the optical fiber at a specified interval consistently include fiber optic humidity sensors to measure characteristics of backscattering this optical fiber with one of its ends and on its changes in areas corresponding to the location of fiber optic sensors measure humidity in the adjacent sensor regions, while in the viewing devices intercity conduit fiber optic transmission line of couplings optical cable output optical fiber optical cable, to the which consistently include fiber optic humidity sensors, which are placed in the channels of the trunk conduit fiber optic transmission line from the viewing device, then measure the characteristic backscattering this optical fiber optical cable with one of its ends and on its changes control the tightness of long-distance channels cable duct fiber optic transmission lines.

The drawing shows a structural diagram of a device for implementing the inventive method.

The device contains a built in trunk conduit fiber optic transmission fiber optic cable connection 1, the optical fiber 2, in which the observation device 3 is derived from the coupling 4 optical cable 1, placed in the channels 5 long-distance cable duct fiber optic transmission fiber optic humidity sensors 6, subsequently incorporated into the optical fiber 2 of the optical cable 1, a measuring device characteristics of the backscattering of the optical fiber 7.

The method is as follows. Periodically the measurement device characteristics backscatter S 7 measure the characteristic of the inverse scattering S 2 OK 1, which includes fiber optic humidity sensors 6, the changes which OC is Nivat tightness of the channels 5 of the ICC.

In the proposed method, unlike the prototype fiber optic humidity sensors consistently include in fiber optic communication cable that eliminates the need for gaskets, special cable and associated problems and, as a consequence, allows you to control the tightness of the long-distance channels cable duct fiber optic transmission line with laid them in optical communication cable. An important advantage of the proposed method is that its implementation system tightness control channel trunk cable duct optical fiber transmission line can be easily integrated with the control system of the cable line and including control system, optical fiber optic communication cables.

LITERATURE

1. EN 2155947. The method of determining the distance leaks in long products.

2. Builder's guide cable communication facilities. / Ed Daaron and others - M.: Communication, 1977. - 672 S.

3. Kunzler W., Calvert, S., M. Laylor Measuring humidity and moisture with fiber optic sensors. - SPIE Proceedings, vol.5278, 2003, p.86-93.

Method of monitoring the integrity of long-distance channels cable duct optical fiber transmission line, namely, that in the optical fiber at a specified interval consistently include fiber optic sensors is laineste, measure the characteristic backscattering this optical fiber with one of its ends and on its changes in areas corresponding to the location of optical fiber humidity sensors measure humidity in the adjacent fiber-optic sensors humidity areas, characterized in that the observation device, long-distance cable duct optical fiber transmission line of couplings optical cable output optical fiber optical cable, which consistently include fiber optic humidity sensors, which are placed in the channels of the trunk conduit fiber optic transmission line from the viewing device, then measure the characteristic of the inverse scattering this fiber optic optical cable from one of its ends and on its changes control the tightness of long-distance channels cable duct fiber optic transmission lines.



 

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