JPH0713052A - Temperature control type cable - Google Patents

Abstract

PURPOSE:To obtain stable transmission characteristics which are not affected by environment by circulating gas or liquid of a prescribed temp. into pipelines and regulating the temp. in the cable. CONSTITUTION:This temp. control type optical cable has optical fibers 1...1 housed in grooves spirally formed on the surface of the spacers 5, the pipelines 2...2 arranged around the circumferences of the spacers 5 and are composed of the metallic pipe having good heat conductivity and a sheath 3 consisting of polyethylene disposed on the outer peripheries of the pipelines. The gas or liquid consisting of gaseous ammonia of the prescribed temp. or water, etc., having large specific heat is passed into the respective pipelines to shut off the optical fibers 1...1 from the outdoor temp. and to hold the fibers at the specified temp. The heat in the pipelines is radiated to the outdoor air or absorbed and, therefore, the medium is circulated via a device for temp. regulation and is maintained at the prescribed temp. The refrigerant cools the circumference by depriving the circumference of the heat at the time of turning to the gas from the liquid if the refrigerant is ammonia or fluorocarbon. The refrigerant is, therefore, supplied in the state of the liquid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature control cable capable of adjusting the internal temperature.

[0002]

2. Description of the Related Art In the case of forming a communication line network using metal electric wire cables or optical fibers, these cables change transmission loss under the influence of ambient temperature changes. Was needed.

[0003]

When such a cable is used and the loss variation occurs, the distortion of the transmitted signal increases even if a design margin is provided for each component.
It is not suitable where high precision information transmission is required.
Further, in an area or place where there is a large difference in temperature and temperature, a transmission cable that is not affected by the environment is required. Therefore, it is an object of the present invention to provide a temperature control type cable that solves the above problems.

[0004]

A first structure according to the present invention is a temperature control system having an information transmission line member in a central portion, a pipe line arranged so as to surround the outer periphery thereof, and an outermost jacket. The mold cable is characterized in that a gas or a liquid having a predetermined temperature is circulated in the conduit to adjust the temperature in the cable.

A second structure according to the present invention is a temperature control type cable having an information transmission line member in a central portion, a pipe line arranged so as to surround the outer periphery thereof, and a jacket in an outermost layer. A shape memory alloy is attached to the filament to fix the filament, and a gas or liquid having a predetermined temperature is circulated in the conduit to adjust the temperature in the cable to change the shape of the filament. To do.

[0006]

In the above first structure, when the information transmission line member is made of metal, its resistance becomes constant, and in the case of an optical fiber, the microbend caused by its temperature expansion and contraction is eliminated, and it has stable transmission characteristics. . In the second configuration, the temperature in the cable is changed according to the temperature of the medium flowing in the pipe, and the shape of the filament body combined with the shape memory alloy can be changed to remotely control the filament body. .

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing the structure of the first embodiment, where 1 ... 1 is an optical fiber housed in a groove spirally provided on the surface of a spacer 5, and 2 ... A conduit 3 in which a metal pipe having good thermal conductivity is arranged around the spacer 5 is a polyethylene jacket provided on the outer periphery of the conduit. 1 is cut off from the outside air temperature and kept at a constant temperature by passing an ammonia gas at a predetermined temperature or a gas or liquid made of water or the like having a large specific heat into each pipe. Since the heat of the medium in the pipe is radiated or absorbed in the outside air, it is circulated through a temperature adjusting device (not shown) and maintained at a predetermined temperature. When the refrigerant is ammonia or chlorofluorocarbon, it is supplied in a liquid state because it heats from the surroundings to cool the surroundings when the liquid becomes a gas. The temperature adjusting medium that circulates in order to equalize the temperature distribution in the length direction and the cross section in the cable may be provided alternately with pipe lines that feed from the front to the tip and pipe lines that feed from the tip to the front.

FIG. 2 is a vertical cross-sectional view showing the structure of the second embodiment, in which the image fiber 1'in the central portion and the gap 6 are provided.
2 are provided in the periphery of the image fiber 1 ', and a shape memory alloy such as a titanium-nickel alloy or a silver-cadmium alloy is fixed to the tip of the image fiber 1'. The conduits 2 and 2 are communicated with each other at the tip of the cable, and the temperature adjusting medium is sent out from one conduit 2 and returned through the other conduit 2. At this time, the temperature adjusting medium is maintained at a predetermined temperature by a temperature adjusting device (not shown). When the temperature inside the cable changes due to the temperature adjusting medium circulating in the pipes 2 ... 2, the shape memory alloy 4 is deformed corresponding to the temperature, so that the image fibers combined with this are 1 ′ to 1 ′. Therefore, it is possible to monitor the object while remotely controlling the tip of the image fiber.

[0009]

As described above, the first temperature control type cable of the present invention has a constant resistance when the information transmission line member is made of metal, and when the optical fiber is made of an optical fiber, due to temperature expansion and contraction. Since it does not generate microbends, it has stable transmission characteristics that are not affected by the environment. Further, the second temperature control type cable of the present invention changes the temperature in the cable according to the temperature of the medium flowing in the pipe, and changes the shape of the linear body combined with the shape memory alloy to change the linear shape. You can control your body remotely.

[0010]

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the configuration of a first embodiment according to the present invention.

FIG. 2 is a vertical sectional view showing the configuration of a second embodiment according to the present invention.

[Explanation of symbols]

 1: Optical fiber 1 ′, 1 ″: Image fiber 2: Pipe line 3: Outer sheath 4: Shape memory alloy 5: Spacer 6: Gap

Claims (2)

[Claims] 1. A temperature control type cable having an information transmission line member at a central portion thereof, a conduit arranged so as to surround the outer periphery thereof, and a jacket at an outermost layer, wherein a gas having a predetermined temperature is provided in the conduit. Alternatively, a temperature control type cable characterized in that the temperature inside the cable is adjusted by circulating a liquid. 2. A temperature-controlled cable having an information transmission line member in a central portion thereof, a conduit arranged so as to surround the outer periphery thereof, and a jacket in an outermost layer, wherein the wire member is a shape memory alloy. A temperature control type cable which is fixed along with a body, and which circulates a gas or a liquid of a predetermined temperature in a pipeline to adjust the temperature inside the cable and changes the shape of the filamentous body.