JPH1194695A - Optical fiber disconnection simulation jig - Google Patents

Abstract

(57) [Summary] [PROBLEMS] A simulation of disconnection of an optical fiber can be performed quickly and with good reproducibility without individual differences.
Provided is an optical fiber disconnection simulation jig. A fixed position holding roller and a position variable roller are associated with each other so as to bend and curl the optical fiber from the side thereof, and a front and rear direction in which the optical fiber is stretched with the combination of these rollers interposed therebetween. , An optical fiber base for guiding the optical fiber slidably in the longitudinal direction was arranged. The number of fixed position holding rollers is N,
It is preferable that the number of position variable rollers is N ± 1 and that they are arranged in a line in the longitudinal direction of the optical fiber. The fixed position holding roller and the optical fiber base are mounted at predetermined positions on a fixed base, the position variable roller is mounted on a movable base, and the movable base is slidably linked to the fixed base by a cross roller way. And good.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber disconnection simulation jig which bends an optical fiber while applying a side pressure to locally increase the loss of the optical fiber.

[0002]

2. Description of the Related Art An optical fiber sensor system of a type which detects the presence or absence of light transmitted through an optical fiber by disconnecting the optical fiber when an abnormality occurs, and thereby detects the presence or absence of an abnormality can be constructed. In such a system, it is necessary to simulate the operation state of the system when the system is installed and perform a test.

[0003] For the above-mentioned simulation test, a method of locally giving a loss to an optical fiber has been proposed. In the conventional proposal, as shown in FIG. 3, the optical fiber 1 is wound several times around a rod 20 having a cylindrical or cylindrical shape, and a local pressure applied to the optical fiber 1 during the winding causes local loss of the optical fiber. Was to be increased. this is,
There are no examples of commercialization of the jigs and devices for applying the lateral pressure as described above, which do not fall outside the range of the manual test by the operator.

[0004]

According to the prior art described above; according to the optical fiber disconnection simulation test technique shown in FIG. 3, the optical fiber is manually wound around a rod made of metal, so that the workability is improved.
The reproducibility and appearance were not good, and sometimes the optical fiber was disconnected due to excessive force. In addition, the above-described manual work requires a certain level of skill in the work, and the work is not suitable for on-site work, for example, there are individual differences in the work. Further, it has been difficult to maintain the state of the optical fiber wound around the rod as described above for a long time.

[0005] In addition, if an on-site test is to be carried out by the conventional method of simulating an optical fiber disconnection, the number of personnel is limited to a skilled person. There was also a risk of accidental disconnection.

Therefore, the problems to be solved by the present invention (objects)
An object of the present invention is to provide an optical fiber disconnection simulation jig capable of performing the simulation of the disconnection of the optical fiber without any individual difference in a quick and reproducible manner.

[0007]

SUMMARY OF THE INVENTION An optical fiber disconnection simulation jig provided by the present invention comprises a combination of a fixed position holding roller and a position variable roller, which are related to bend the optical fiber from its side. And an optical fiber base that guides the optical fiber so as to be slidable in its longitudinal direction before and after the direction in which the optical fiber is extended with the combination of these rollers interposed therebetween.

[0008] According to the optical fiber disconnection simulation jig of such means, the extended optical fiber is passed between the fixed position holding roller and the position variable roller while the position variable roller is moved backward to the side. Then, by pushing the variable position roller toward the fixed position holding roller side, the optical fiber is pushed in from the side and is bent between the fixed position holding roller and the variable position roller, and the local loss of the optical fiber is reduced. Can be created. At this time, since the optical fiber is drawn by the rotating body of the roller, the distortion due to the bending of the optical fiber does not concentrate at one point.

Further, when the optical fiber in the stretched state is curved from the side, the optical fiber length becomes longer on the same plane. Therefore, when the terminal side of the optical fiber is fixed, the optical fiber is bent while being stretched, and the optical fiber is disconnected as it is. In this regard, in the present invention,
Since the optical fiber base guides the optical fiber slidably in the longitudinal direction before and after the extension direction of the optical fiber between the rollers, the simulation of disconnection due to the bending of the optical fiber into the roller is quickly and reliably performed. In addition, it is possible to carry out with good reproducibility.

In a preferred embodiment, the number of the fixed position holding rollers is N, and the number of the position variable rollers is N ± 1. By doing so, the optical fiber can be bent at a plurality of points, and the increase in local loss of the optical fiber can be increased (for example, four fixed position holding rollers, three position variable rollers, When the bending diameter of the optical fiber at the portion is 12 mmφ, a loss of 30 dB or more can be generated in the single mode optical fiber.)

The fixed position holding roller and the optical fiber base are mounted at predetermined positions on a fixed base, the position variable roller is mounted on a movable base, and the movable base is a cross roller with respect to the fixed base. The way is preferably slidably linked, so that the position variable roller cross-moves with respect to the fixed position holding roller. By doing so, the finite linear movement of the movable base relative to the fixed base can be accurately performed, and the relative movement of the position variable roller with respect to the fixed position holding roller can be made accurate, so that the bending to the optical fiber can be reduced accordingly. It can be performed accurately and with good reproducibility.

When the position variable roller is moved to a position in a line in the direction in which the optical fiber is extended with respect to the fixed position holding roller, a means for holding the position variable roller may be provided. By doing so, the state of simulating the disconnection of the optical fiber can be maintained for a certain period of time.

[0013]

1 and 2 show an embodiment of the present invention, FIG. 1 shows an initial setting state of an optical fiber disconnection simulation jig, and FIG. 2 shows a disconnection simulation state of an optical fiber disconnection simulation jig. Is shown.

The optical fiber disconnection simulation jig of this embodiment is:
A combination of a fixed position holding roller 7A and a position variable roller 7B for pinching and bending an optical fiber from the side, a combination of a fixed base 1 and a movable base 2 for supporting these rollers from below, and guiding the optical fiber. The front and rear optical fiber bases 10A and 10B are the main means.

The fixed base 1 is made of an aluminum channel material and extends the optical fiber 5 on a flat main base surface, and legs are suspended at both ends of the main base surface through which the optical fiber 5 passes. In this manner, one movable base 2
Is a rectangular plate made of aluminum, which is disposed between both end legs of the fixed base 1 and has a fixed shape.
Are connected to each other at both ends of the movable base 12 by cross roller ways 3A, 3A, 3B, 3B, so that the movable base 2 extends below the fixed base 1 in the direction in which the optical fiber 5 extends. It is placed so that it can move finitely in a straight line.

On the main base surface of the fixed base 1, three rows of elongated holes 4 elongated at a constant interval along the direction in which the optical fiber 5 extends and in a direction intersecting the line through which the optical fiber passes are provided. Has formed. Also, four shafts 8A are erected alternately with the long holes 4 on the side line deviated from the line through which the optical fiber passes, and
A supports a fixed position holding roller 7A at A. Therefore, the fixed position holding rollers 7A are alternately arranged in the elongated holes 4 and are arranged in groups of up to four. Reference numeral 9A denotes a stop ring for preventing the fixed position holding roller 7A from coming off in a state where it can rotate around the shaft 8A.

In the movable base 2 as well, three shafts 8A are erected, and these shafts 8A are vertically penetrated through the long holes 4 of the fixed base and protrude above the fixed base 1, and are positioned at the protruding portions. The variable roller 7B is pivotally supported. Accordingly, the position variable rollers 7B are alternately arranged in rows in groups of up to three with respect to the fixed position holding roller 7A, and each position variable roller 7B is inserted between adjacent portions of the other fixed position holding roller 7A. It is possible to move as much as possible.
Reference numeral 9B denotes a stop ring to prevent the variable position roller 7B from coming off in a state where it can rotate around the shaft 8B.

Fixed position holding roller 7A and position variable roller 7
In B, the structure of the roller itself is the same, and a ring-shaped groove 6 is formed on the outer peripheral surface slightly in the axial direction of the cylindrical main body so that the optical fiber 5 can be guided by the ring-shaped groove 6.

Further, the optical fiber bases 10A and 10B
Is a fixed base 1
The slits 11A and 11B having a width larger than the outer diameter of the optical fiber 5 by 0.5 mm are formed in each of the optical fiber bases 10A and 10B. Both ends of the optical fiber insertion portions of the slits 11A and 11B; the inlet and the outlet are rounded or chamfered so that the optical fiber 5 can be smoothly drawn in even if it is curved.

On the optical fiber bases 10A and 10B,
Slit covers 12A and 12B made of acrylic are hinged in a one-sided manner, and a decorative screw 13 is provided on the open end side.
A and 13B are fixed, so that the slits 11A and 11B are covered and a tunnel of the optical fiber 5 is formed. In addition, 15
B and 15C are stop cords, and the decorative screws 13A and 13B are connected and fixed to the fixed base 1 to prevent the screws from being lost.

Further, a holding means for stopping the movement of the movable base 2 is provided between the fixed base 1 and the movable base 2. The holding means is composed of a stop hole 16 formed at a portion where the fixed base 1 and the movable base 2 meet, and a stop pin 14. The stop pin 14 is inserted into the stop hole 16 of the movable base through the stop hole of the fixed base 1. When inserted, the movement of the movable base 2 can be suppressed.
In addition, 15A is a stop cord, and the stop pin 16 is connected and fixed to the fixed base 1, so that the stop pin 16 is prevented from being lost.

The procedure for simulating an optical fiber disconnection using the optical fiber disconnection simulation jig of the present embodiment will be described. First, the operation of passing the optical fiber 5 is performed. This is, as shown in FIG.
The movable base 2 is moved backward by a finite linear motion (moves to the front side in the drawing) to move the row group of the position variable rollers 7B back to the front side in the drawing, and the position variable rollers 7B separated from each other are fixed to the fixed position. Optical fiber 5 between holding roller 7A
Is passed in an extended state. At this time, the optical fiber 5 is connected to the slits 11A, 11A of the front and rear optical fiber bases 10A, 10B.
B is passed in a loose state, and after passing, the optical fiber 5 is prevented from jumping out of the slit by being covered with slit covers 12A and 12B and screwed with decorative screws 13A and 13B. At this time, it goes without saying that the retaining pin 14 is pulled out.

After confirming that the optical fiber 5 which has been threaded as described above is guided by being fitted in the ring-shaped groove 6 of the fixed position holding roller 10A, it is finally shifted to the simulation of disconnection of the optical fiber. I do. That is, as shown in FIG. 2, by moving the movable base 2 forward, the position variable roller 7B is moved forward.
The optical fiber 5 is fitted into the ring-shaped groove, and the variable position roller 7B is inserted between the fixed position holding rollers 7A and is pushed in until the roller is in series.

Then, the optical fiber 5 is bent into a snake shape under the side pressure as shown in the figure between the fixed position holding roller 7A and the position variable roller 7B, so that the optical fiber 5 A simulated disconnection condition is created that locally increases the loss. At this time, the optical fiber 5 is drawn in by the amount curved while being guided by the optical fiber bases 10A and 10B before and after the roller group.

In order to simulate the disconnection of the optical fiber 5 as described above for a certain period of time, the stop pin 14 is inserted into the stop hole 16 formed in the fixed base 1 and the movable base 2.
Hold the disconnection simulation state.

According to the optical fiber disconnection simulating jig of the embodiment described above, the optical fiber disconnection simulating jig can easily simulate the disconnection of the optical fiber without limitation of the operator. It is possible to measure the external dimensions and weight of the jig of this embodiment by 30 mm in height and 125 mm in width.
X It is extremely lightweight and compact with a height of 40 mm and a weight of 500 g, which can be provided without being in the way of carrying around and suitable for on-site work.

The optical fiber disconnection simulation jig of the present invention can be applied not only to the original use of performing the disconnection simulation test but also to the case of transmitting information by transmitting / cutting light transmitted through an optical fiber, for example. Its application range is wide.

[0028]

According to the present invention as described above, an optical fiber disconnection simulation jig which can execute an optical fiber disconnection simulation quickly and with good reproducibility without any individual difference. The intended task (objective) of providing the information can be achieved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an optical fiber disconnection simulation jig in an initial set state according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an optical fiber disconnection simulating jig in a disconnection simulating state according to the embodiment of the present invention.

FIG. 3 is a perspective view showing a conventional example of a simulation of disconnection of an optical fiber.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed base 2 Movable base 3A, 3B Cross roller way 4 Long hole 5 Optical fiber 7A Fixed position holding roller 7B Position variable roller 10A, 10B Optical fiber base 14 Stop pin (hold means) 16 Stop hole (hold means)

Claims (4)

[Claims] An optical fiber includes a combination of a fixed position holding roller and a position variable roller, which are associated with each other so as to bend and curl the optical fiber from the side thereof. An optical fiber disconnection simulation jig in which an optical fiber base for guiding an optical fiber slidably in a longitudinal direction thereof is disposed. 2. The optical fiber disconnection according to claim 1, wherein the number of the fixed position holding rollers is N, and the number of the position variable rollers is N ± 1, and the plurality of the position variable rollers are arranged in the longitudinal direction of the optical fiber. Simulated jig. 3. The fixed position holding roller and the optical fiber base are mounted at predetermined positions on a fixed base, the position variable roller is mounted on a movable base, and the movable base is a cross roller with respect to the fixed base. 3. The optical fiber disconnection simulation jig according to claim 1, wherein the way is slidably linked by the way, so that the position variable roller cross-moves with respect to the fixed position holding roller. 4. The apparatus according to claim 1, further comprising means for holding the position variable roller when it is moved to a position lined up in a direction in which the optical fiber extends with respect to the fixed position holding roller. An optical fiber disconnection simulation jig according to the item.