JP2001215168A - Method and system for comparing and inspecting optical fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a method and a system which can reduce staff members by automatically informing workers at an oscillation application point of an application timing and application results. SOLUTION: A line between a portable telephone 3 of a comparing apparatus 2 and a portable telephone 7 of an oscillation result-receiving apparatus 1 or a line between a telephone 4 of the comparing apparatus 2 and a telephone 8 of the receiving apparatus 1 is connected beforehand. The worker G at a work place sequentially oscillates overcrowding optical fibers of an optical cable with the use of an oscillator 11. When detecting an oscillation signal, a body 6 of the comparing apparatus 2 transmits to the portable telephone 7 or the telephone 8 of the oscillation result-receiving apparatus 1 at the work place with the use of the portable telephone 3, an acoustic coupler 5 or the telephone 4 that the compared optical fibers have a correspondence. When receiving a tone signal via the portable telephone 7, the telephone 8 or an acoustic coupler 9, a body 10 of the oscillation result-receiving apparatus sounds a buzzer or displays an LED to inform that the optical fibers have the correspondence.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber cable or optical fiber cable contrast system, in which a controller is connected to an optical fiber to be compared, and any part of the optical fiber is added. The present invention relates to a method and system for automatically informing a worker at a vibration point of a vibration timing and a vibration result when the vibration is performed.

[0002]

2. Description of the Related Art Generally, the following method is known as a method of searching for a target optical fiber cable or optical fiber core when switching or removing an optical fiber cable on a road or in a manhole. I have.

[0003] For example, in a state where a control device is connected to the end of a target optical fiber cable and light is incident, a state of a knitted wave of light generated by ultrasonic vibration applied at a working point to the optical fiber cable is monitored. There is a first method for finding a target optical fiber cable.

An interference type control device is connected to both ends of an optical fiber formed in a loop shape, and a desired optical fiber is vibrated at a working point of the optical fiber to utilize a change in the intensity of the interference light. There is also a second method of searching for an optical fiber cable or optical fiber core.

In the first and second methods, an inspector for optical fiber judgment notifies a worker at a remote work place of an output result from a control device by telephone or the like, and also sends the result from the worker to the inspector. The contents of the excitation (number of strikes, cycle, etc.) were notified.

[0006] The inspector on the cable determination side receives the output result of the optical fiber to be vibrated from the control device, and detects whether or not the optical fiber is the desired one.

[0007]

However, according to the above method, the worker at the excitation point and the inspector at the remote point are excited by notifying the timing and contents of the excitation by telephone communication. Since this method detects an optical fiber, there is a problem that an extra inspector is required. That is, there was a problem that extra cost was required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and provides a method and system capable of reducing the number of workers by automatically informing a worker at a vibration point of a vibration timing and a vibration result. The purpose is to:

[0009]

According to the optical fiber contrast inspection method of the present invention, a desired excitation point of an optical fiber is excited by a predetermined excitation signal, and the optical fiber is located at a point remote from the excitation point. The gist of the present invention is to output a signal corresponding to a vibration signal of a fiber, connect a communication line between the remote side and the vibration side, and automatically transfer the output signal to the vibration side.

According to a second aspect of the present invention, a desired excitation point of the optical fiber is excited by a predetermined excitation signal, and both ends of the optical fiber are connected to the optical fiber at a point remote from the excitation point. The gist is that a signal corresponding to the excitation signal of the optical fiber is automatically notified from the reference device to the excitation result receiving device at the excitation point.

According to an embodiment of the optical fiber contrast inspection system of the present invention, the vibration result receiving apparatus includes a transmitting / receiving means for transmitting / receiving a signal when a line is connected to the contrast apparatus and the apparatus is in a talking state. And a vibration result receiving device main body that, when the transmission / reception unit receives the vibration detection, identifies the detection content and generates an LED display or a buzzer sound according to the identification result.

[0012] The control device is a transmission / reception means for transmitting / receiving a signal when a line is connected to the vibration result receiving device side and in a talking state, and light is incident from both ends of the optical fiber by a branch element. Then, the light is propagated in the optical fiber in the clockwise and counterclockwise directions, and both the clockwise and counterclockwise optical signals that have propagated are combined, and the light receiving signal of the combined result is set in advance. A control device main body for detecting whether or not the vibration pattern exists, and transmitting the detection to the vibration result receiving device using the transmission / reception means of the device.

The transmission / reception means of the vibration result receiving apparatus may include a wired telephone, a voice converting means provided so as to be able to receive voice from a receiver of the wired telephone and converting the voice into an electric signal, or a portable telephone. Wherein the vibration result receiving device main body includes:
Means for identifying the type of the tone signal in response to the reception of the tone signal from the mobile phone or the voice conversion means, and informing the control result by the LED or the buzzer based on the identification result.

[0014] The transmitting and receiving means of the control device may be a wired telephone and a voice converting means provided to transmit a voice obtained by converting a tone signal to a receiver of the wired telephone or a portable telephone. The control device main body includes a unit that, when detecting the vibration pattern, sends the detection to the voice conversion unit or the mobile phone as a tone signal of a predetermined number.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS <First Embodiment> As one of the optical fiber contrast devices, Japanese Patent Application No. 11-7080, which utilizes the interference effect of clockwise light and counterclockwise light of a looped optical fiber.
There are three fiber optic comparators.

In the first embodiment, an optical fiber comparator is used. In a state where a target optical cable is connected to the present apparatus, a worker at a work place (excitation point) can use an optical fiber. When the target is excited, the remote control device detects the excitation signal and automatically notifies the excitation result receiving device of the work place by wire telephone or wireless telephone, so that the worker alone can perform the contrast operation. It is something that can be done.

FIG. 1 is a schematic configuration diagram of an optical fiber cable contrast inspection system according to the first embodiment.

In this contrast inspection system, a vibration result receiving device 1 is arranged in a work place, and a contrast device 2 is connected to an appropriate optical fiber cable in the optical fiber cable by a terminal station of a target optical fiber cable. Connect to The two optical fibers are connected to each other at an appropriate place remote from the work place to form an optical fiber loop.

Here, one of the two optical fibers is
It may be housed in another cable.

The control device 2 is a portable telephone 3 or a wired telephone 4 and a receiving microphone 4 a of the wired telephone 4.
And a control device main body 6. The mobile phone 3 (preferably a PHS with a transceiver function) and the acoustic coupler 5 are connected to the control device body 6.

The vibration result receiving device 1 may be a portable telephone 7 (preferably a PHS with a transceiver function) or
An acoustic coupler 9 for converting a tone signal from a wired telephone 8 and a receiving microphone 8a of the wired telephone 8 into an electric signal and transmitting the electric signal.
And the excitation result receiving apparatus main body 10.

An acoustic coupler 9 and a portable telephone 7 are connected to the main body 10 of the excitation result.

That is, in the first embodiment, the portable telephone 3 of the control apparatus 2 and the portable telephone 7 of the vibration result receiving apparatus 1 or the telephone 4 of the contrast apparatus 2 are connected by an appropriate communication line.
And the telephone 8 of the vibration result receiving apparatus 1 are connected in advance.

Then, the worker G at the work place sends the vibrator 11
Are sequentially used to vibrate the congested optical cables.

When detecting the excitation signal from the connected optical fiber, the control device main body 6 of the control device 1 displays a number of LEDs according to the level of the excitation signal or emits a buzzer sound. A tone signal indicating that the contrast can be obtained is transmitted to the mobile phone 7 or the phone 8 of the vibration result receiving apparatus 1 at the work site using the mobile phone 3 or the acoustic coupler 5 and the phone 4.

When receiving a tone signal via the portable telephone 7 or the telephone 8 and the acoustic coupler 9, the vibration result receiving apparatus main body 10 displays a buzzer sound or an LED to notify that a contrast has been obtained. I do.

(Detailed Structure) As shown in FIG. 2, the control device main body 6 is a loop-shaped optical fiber (loop portion) formed by connecting one end of two optical fibers to form a loop. A light-emitting element 14 that emits light a based on a drive signal from the drive circuit 13, an optical branching / coupling element 15 that splits and couples input light, and receives light. Light-receiving element 16 for converting the light-receiving signal from the light-receiving element 16 into an electric signal, an amplifying circuit 17 for amplifying the light-receiving signal from the light-receiving element 16, a high-pass filter circuit 18 for passing a high-frequency component of an output signal from the amplifying circuit 17, An optical connector 19 for connecting the element 15 to one end of the loop optical fiber, and a connector 21 for connecting the other end of the optical branching / coupling element 15 to the other end of the loop optical fiber are provided. That.

Further, a filter 18 is connected to the output of the amplifier circuit 17. That is, with this filter,
The excitation signal from the exciter 11 is extracted.

A discriminator 26 is connected to the filter 18, and the discriminator 26 compares the output signal from the filter circuit 18 with a vibration pattern Hi of a memory (not shown), and matches the vibration pattern Hi. When a signal to be applied is detected, the speaker 28 and the display circuit 29 are used to notify the detection of the excitation pattern Fi.

A tone signal generating circuit 30 is connected to the discriminating section 26. Tone signal generating circuit 30
Sends the tone signal “7” to the portable telephone 3 via the output terminal 31 or the telephone 4 or the acoustic coupler 5 when the discriminating unit 26 determines that it is a control (excitation pattern detected).

Further, the tone signal generating circuit 30 periodically sends out a pilot signal to notify that the comparison is being performed. This pilot signal is "4" of the tone signal.

Further, in FIG.
8, discrimination unit 26, tone signal generation circuit 30, display circuit 2
3, the output signal of the light receiving element 16 is amplified by an amplifier circuit 17, and a sound corresponding to the amplified signal of the amplifier circuit 17 is output from a speaker 28 as shown in FIG. It generates the amplified signal from the amplifier circuit 17 directly from the output terminal 31 or the portable telephone 3 or the wired telephone 4
May be sent to

Next, the configuration of the vibration result receiving apparatus main body 10 will be described with reference to FIG. Excitation result receiving device main body 1 in FIG.
0 indicates a telephone 8 or a mobile telephone 7 via an acoustic coupler 9
Input terminal 35 for connection with the tone signal and a tone signal identification circuit 36 for identifying the number of the tone signal from the input terminal 35
And a selection circuit 40a for driving an external speaker via the speaker 37, the display circuit 38, or the output terminal 39 based on the result of the identification by the tone signal identification circuit 36.

(Explanation of Operation) The operation of the optical fiber cable contrast type inspection system configured as described above will be described with reference to the sequence diagram of FIG. In this description, communication using a mobile phone will be described.

As shown in FIG. 1, the worker connects the control device main body 6 of the control device 2 to both ends of the looped optical fiber.

Then, the vibration result receiving device 1 is arranged at the work place, and the line is connected in advance to the mobile phone 3 of the control device 2 using the mobile phone 7 of the vibration result receiving device 1 (FIG. 6 d1).

When the portable telephones 3 and 7 have a transceiver function, the use of the transceiver function makes the line usage fee free.

Then, the worker at the work place has the shaker 11
Is used to sequentially vibrate the optical fibers of the congested optical cable. Due to this excitation, the light propagating in the optical fiber undergoes a phase change and propagates (d2 in FIG. 6).

When the control device main body 6 is connected to the vibrated optical fiber, the control device main body 6
Is received by the light receiving element 16 via the optical branching / coupling element 15, and is amplified by the amplifier circuit 17.

That is, light is propagated clockwise and counterclockwise in the optical fiber, and a phase change is caused in the light propagated by the vibrator 11 at the point of excitation. The light (including the excitation signal) propagating clockwise and counterclockwise in the optical fiber is coupled by the branch coupling element 15, and a signal corresponding to the excitation is transmitted from the reception signal of the coupling result by the light receiving element 16. Then, the amplification circuit 17 amplifies.

The output signal from the amplifier circuit 17 is input to the filter circuit 18 to extract the excitation signal. And
The determination unit 26 compares the excitation pattern Hi with a previously stored excitation pattern Hi, and when it detects a signal that matches the excitation pattern Hi, determines that true excitation detection has been performed.

The tone signal generating circuit 30 sends an electric signal corresponding to the tone signal "7" to the portable telephone 3 through the output terminal 31 when the discrimination section 26 judges that the vibration is detected (see FIG. 6). d3).

The tone signal identification circuit 36 of the excitation result receiving apparatus main body 10 identifies the number of the tone signal from the input terminal 35. For example, when the tone signal is identified as "7", the selection circuit 4
0a indicates that the control was successful.
8 are all turned on.

For example, when the tone signal discriminating circuit 36 discriminates "4", the speaker 37 which sounds that it is a pilot signal is sounded.

Therefore, the control work can be performed by one worker alone, which leads to a reduction in cost.

The minimum configuration of the present invention is as follows.
The output signal of the amplifier circuit 17 may be sent to the communication line via the output terminal 31 as shown in FIG. 3 by omitting 8, 25, 26, 29 and 30. At this time, the excitation result receiving apparatus main body 10 may omit the signal 36 and, instead of using the signal from the amplifier circuit 17 as a selection circuit, hear the sound directly from the speaker 37 via the amplifier circuit 40b as shown in FIG. Good.

<Second Embodiment> FIG. 7 is a schematic configuration diagram of an optical fiber cable contrast type inspection system according to a second embodiment. The second embodiment has the functions of the first embodiment,
The vibration device 43 transmits the vibration pattern Fi at the time of vibration to the mobile phone 7.
Is transmitted to the mobile phone 3 of the control device 41 using the vibration pattern Fi received by the control device main body 44, and the vibration pattern fi of the optical fiber is detected, and the detection is performed by the mobile phone 3 or the telephone. 4 is transmitted as a tone signal to the portable telephone 7 or the telephone 8 of the vibration result receiving apparatus 1.

The vibration device 43 is connected to the portable telephone 7 of the vibration result receiving device 1. As shown in FIG. 8, the vibrating device 43 includes a driving mechanism 46 for vertically moving a vibrating rod 45 having a spherical tip using a stepping motor, and a 7KHZ (not necessarily a 7KHZ) from an oscillation circuit 47. In the present description, a driver 48 that amplifies an oscillation signal of 7 KHZ) and sends it to the drive mechanism 46 and an input vibration pattern Fi (consisting of a cycle tp, an intensity level kp, a duty ratio Dp, etc.) are stored. The excitation pattern transmitting unit 49 for transmitting the excitation pattern Fi using the mobile phone 8.
And

The tip of the vibrating rod 45 is a spherical tip 50 which is not necessarily spherical but is assumed to be a sphere in the present description. The optical fiber cable 1 is damaged by vibrating the spherical tip 50. A cushion member 51 for preventing such a situation is adhered.

The control device main body 44 is, as shown in FIG.
In addition to the configuration of the first embodiment, when an input terminal 54 connected to the mobile phone 3 and a vibration pattern Fi are input via the input terminal 54, the vibration pattern Hi in the memory 56 is changed to the vibration pattern Hi. A pattern updating unit 55 for updating to Fi is provided.

The output signal from the filter circuit 25 is compared with the excitation pattern Hi of the memory 56, and a signal matching the excitation pattern Hi (the excitation pattern F of the excitation device) is used.
a determination unit 57 that determines that the vibration pattern Fi of the vibration device is detected when the number i) is continuously detected by the number of determinations Np stored in the memory 56.

That is, in the second embodiment, the vibration
While using the optical fiber 3 to protect the looped optical fiber, the optical fiber is hit with a specific periodic pattern while transmitting the vibration pattern Fi to the control device 42 side, and the control device 41 receives the vibration pattern Fi and stores it in the memory 56. Is updated to the excitation pattern Fi, and the excited optical fiber is detected using the updated excitation pattern Hi (Hi ← Fi) and detected by the excitation result receiving apparatus 1. Send what you did.

Therefore, even if the operator arbitrarily changes the vibration pattern, the comparison is automatically performed with the changed pattern and transmitted to the vibration result receiving apparatus 1 at the work site.

The above-described processing of the determination section 57 is supplemented.

The discriminating section 57 determines the cycle th based on the previous output signal Pi-1 from the filter 25 and the current output signal Pi.
And the amplitude (intensity kh) and the duty Dh are obtained.
The cycle tp and the duty ratio D, which are the excitation pattern Hi of No. 6
It is determined whether p and amplitude (intensity) kp match.

When it is determined that they match, the vibration pattern is determined to be the vibration pattern Hi when the vibration device 43 vibrates the optical fiber. It is desirable that the above-mentioned strength Kp is set to a level in consideration of the loss of the transmission path.

Next, when it is determined that the vibration pattern is Hi, the number Ni is counted using a counter (not shown).
This count value Ni is a count value N stored in advance.
When it reaches p, it is determined that the true vibration pattern Fi has been detected.

Therefore, even if the amount of vibration is at least and a plurality of optical fibers are congested, the vibration pattern of the optical fiber vibrated at the vibration point can be accurately detected and moved.

Further, in the above-described embodiment, one-side vibration is described as an example in which only one side of the loop-shaped optical fiber is accommodated in the predetermined optical cable, but in the present invention, both sides are vibrated. The present invention can also be applied to a case where a loop-shaped optical fiber is often folded and both sides are accommodated in a predetermined optical cable. If the optical fiber length from the excitation point to the optical branching / coupling element 15 has little difference between clockwise and counterclockwise, a phase change due to the excitation cannot be detected. In such a case, an optical delay element is connected to a position away from the excitation point of the loop-shaped optical fiber.

Although the above embodiment has been described with reference to an optical fiber cable, the present invention is not limited to this, and can be applied to an optical fiber core.

<Embodiment 3> FIG. 10 is a schematic configuration diagram of Embodiment 3. In the detection method of the system shown in FIG. 10, a continuous vibration (excitation pattern (fo)) of, for example, about 3 KHZ (fo) is applied to the optical fiber cable by the vibrator 60, and the signal level or the like is detected by the receiving device 65. Is determined. In other words, the notification from the receiving device 65 to the vibrator 60 sends out either a signal indicating whether or not the vibration pattern (fo) was received.

In the system according to the third embodiment, the receiving device 65 includes a light emitting element LD, an optical coupler 61, and an optical coupler 62.
, A light receiving element LD, a selection level meter 63, a tone signal generation circuit 30, a mobile phone 3, an acoustic coupler 5,
It is composed of a wired telephone 4 or the like. Further, on the vibrating side, there is provided a vibrator 60, and a vibration result receiving device main body 1 in which the mobile phone 8 and the acoustic coupler 9 are connected. A telephone 8 is provided on the vibration side.

That is, the light from the light emitting element LD is split into two systems by the optical coupler 61 and is made to enter and propagate to two different optical fibers in the optical fiber cable. The optical signals are multiplexed again using an optical fiber cable, and are received by the light receiving element PD.

Then, a vibration is applied at a specific frequency fo by a vibrator at a vibration point (manhole or road).

The optical fiber in the optical fiber cable receives stress due to the applied vibration, and the propagation optical path length changes. In other words, as the propagation optical path length changes,
The relative phase difference of the light propagating through the two conductors changes.

This change is multiplexed by the optical coupler 61 at the end of the optical fiber cable, and the applied vibration is received by the light receiving element PD as a change in the intensity of the interference light.

Next, the selection level meter 63 extracts the signal of the frequency fo from the output signal from the light receiving element PD, generates a DB level corresponding to the distance, and sends it to the tone signal generation circuit 30.

The tone signal generating circuit 30 transmits the tone signal corresponding to the level from the selection level meter 63 to the vibration result receiving apparatus main body 1 by the telephone 4 via the portable telephone 3 or the acoustic coupler 5.

<Fourth Embodiment> FIG. 11 is a schematic configuration diagram of a fourth embodiment. In the system according to the fourth embodiment, the receiving device includes a light emitting element LD, a polarizer 65, and a light receiving element PD.
, An analyzer 66, a selection level meter 63, a tone signal generation circuit 30, a mobile phone 3, an acoustic coupler 5, a wired telephone 4, etc., and the polarizer 65 is connected to one end of an optical fiber cable. Then, the folded other end of the optical fiber cable is connected to the analyzer 66. Optical fibers are connected to each other at the turn-back portion of the optical fiber cable by an optical connector.

On the vibrating side of the optical fiber cable,
An ultrasonic head 68 is provided, and a head driver 67 drives the ultrasonic head 68.

Further, there is provided the main body 1 of the vibration result receiving apparatus, in which the portable telephone 8 and the acoustic coupler 9 are connected. A telephone 8 is provided on the vibration side.

That is, the light from the light emitting element LD is incident on the optical fiber by the polarizer 65 instead of the polarized light of a fixed direction, and is transmitted through the optical probe 66 at the end of the optical fiber cable in a predetermined direction. The polarized light is received by the light receiving element PD.

Then, the excitation point (manhole or road)
Then, the head driver 67 drives the ultrasonic head 68 to apply vibration to the optical fiber at a predetermined frequency fo. The optical fiber in the optical fiber cable is
The direction of deflection of light propagating in the optical fiber changes at the frequency fo.

The analyzer 66 at the end of the optical fiber cable
Makes only the light of the knitted wave in a certain direction incident on the light receiving element PD with the light that has returned after propagating through the optical fiber. That is, the output from the light receiving element PD is a signal oscillating at the predetermined frequency fo.

Next, the selection level meter 63 extracts the frequency fo from the signal received by the light receiving element PD, generates a DB level according to the distance, and generates a DB level corresponding to the distance.
To send to.

The tone signal generating circuit 30 transmits the tone signal corresponding to the level from the selection level meter 63 to the main body 1 of the vibration result receiving device by the telephone 4 via the portable telephone 3 or the acoustic coupler 5.

Although the above embodiment has exemplified the optical cable comparator for searching for the target optical cable from the congested optical cable, the present invention is not limited to this. The present invention can also be applied to an optical fiber core comparator for searching for a target optical fiber core from the above.

[0078]

As described above, according to the present invention, the communication line between the vibrating side and the remote side is maintained in a talking state.

When the operator vibrates the desired excitation point of the looped optical fiber, the remote side (control device) transmits both the optical signals that have propagated clockwise and counterclockwise through the optical fiber. It is combined, and it is detected whether or not a predetermined excitation pattern exists in the light receiving signal as a result of the combination, and the detection is transmitted to the excitation side (the excitation result receiving apparatus main body).

When the vibrating side receives the detection of the vibration, it identifies the detection content and generates an LED display or a buzzer sound according to the result of the identification.

For this reason, even if the inspection worker is not arranged on the control device side, the worker at the work place can perform the control work alone, so that it is possible to reduce the number of workers and reduce the cost. Have been.

Further, according to the present invention, the transmitting / receiving means of the control apparatus located at a remote point and the transmitting / receiving means of the excitation result receiving apparatus located at the excitation point are constituted by a wired telephone and an acoustic coupler. Since the portable telephone is constituted by the portable telephone, it is not necessary to change the circuits of the portable telephone and the portable telephone.

Furthermore, according to the present invention, after the vibration point side and the remote side are in a talking state, the vibration pattern is sent from the vibration point side to the control device side, and the control device rotates clockwise in the optical fiber. And the optical signal propagating counterclockwise is detected, and whether or not the received excitation pattern exists in the received light signal as a result of the coupling is detected, and the excitation result is received using the transmission / reception means of the control device. Have the device transmit.

Therefore, even if the vibration pattern is changed on the vibration device side, the vibration pattern is automatically stored in the control device main body, and the vibration pattern is compared using the vibration pattern. The effect is obtained that the vibration result is transmitted to the vibration result receiving device arranged at the swing point and is notified to the worker.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an optical fiber cable contrast type inspection system according to a first embodiment.

FIG. 2 is a schematic configuration diagram of a control device according to the first embodiment.

FIG. 3 is a schematic configuration diagram of an application example of the control device of the first embodiment.

FIG. 4 is a schematic configuration diagram of a main body of the vibration result receiving apparatus according to the first embodiment;

FIG. 5 is a schematic configuration diagram of an application example of the main body of the vibration result receiving apparatus according to the first embodiment;

FIG. 6 is a sequence diagram illustrating the operation of the first embodiment.

FIG. 7 is a schematic configuration diagram of a control inspection system according to a second embodiment.

FIG. 8 is a schematic configuration diagram of a vibration device according to a second embodiment.

FIG. 9 is a schematic configuration diagram of a control device according to a second embodiment.

FIG. 10 is a schematic configuration diagram of a third embodiment.

FIG. 11 is a schematic configuration diagram of a fourth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Excitation result receiving apparatus main body 2 Contrast apparatus 3 Mobile phone 4 Telephone 5 Acoustic coupler 6 Control apparatus main body 7 Mobile phone 9 Acoustic coupler 10 Excitation result receiving apparatus main body 11 Exciter 15 Optical branching coupling element 20 Optical branching Coupling element 26 discriminator 30 tone signal generation circuit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shinichi Niimi 1440, Mukurosaki, Sakura City, Chiba Prefecture Fujikura Co., Ltd.Sakura Plant (72) Inventor Toru Takashima 1440, Sakura City, Chiba Prefecture Fujikura Sakura Plant (72) Inventor Person Takayoshi Yamanaka 1440 Murosaki, Sakura City, Chiba Prefecture Fujikura Co., Ltd. Sakura Office F-term (reference) 2G086 AA01 2H038 CA39

Claims (2)

[Claims] A desired excitation point of an optical fiber is excited by a predetermined excitation signal, and a signal corresponding to the excitation signal of the optical fiber is output at a point remote from the excitation point, An optical fiber contrast inspection method in which a communication line is connected to a remote side and the vibration side and the output signal is automatically transferred to the vibration side. 2. A desired excitation point of the optical fiber is excited by a predetermined excitation signal, and the optical fiber is excited at a point remote from the excitation point by a control device having both ends connected to the optical fiber. An optical fiber contrast inspection system for automatically notifying a signal corresponding to a signal to a vibration result receiving device at the vibration point.