JP2005265524A - Coated optical fiber collator and coated optical fiber collating method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coated optical fiber collating method and a coated optical fiber collator for enhancing work efficiency and keeping down a product cost. <P>SOLUTION: A projection part 2 or a recess part 3 is equipped with a light receiving element 10 for receiving leak light while the projection part 2 or the recess part 3 is equipped with a hollow part 4 in its interior. This hollow part 4 is equipped at least with an opening part 8d opening at a position confronting the receiving element 10, first and second light intakes 8a and 8b opening in an optical fiber on both the right and left sides of the opening part 8d, first and second light guide means 5 and 6 for guiding the leak light taken in from the light intakes 8a and 8b to the receiving element 10, and an interception means 7a for intercepting the leak light taken in from one light intake. Therefore, transmission direction determination or core collation detection can be performed by using the single receiving element 10 by one time of measurement. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an optical fiber core wire contrast device and a fiber optic core wire contrast method including a bending portion that performs non-destructive optical fiber core wire contrast and live line discrimination.

  When installing, maintaining, or removing an optical fiber, the presence or absence of communication light is detected nondestructively by bending the optical fiber and detecting communication light or specific signal light that slightly leaks from the site. In general, an active fiber discriminating method and an optical fiber core wire contrast method for determining whether or not a specific optical fiber is used are generally used.

  FIG. 8 is a diagram showing a configuration of such an optical fiber core wire contrast method. The optical fiber contrast device 100 is roughly divided into a transmitting side and a receiving side. The transmitting side is an optical fiber 104, a light emitting element 102 connected to one end of the optical fiber 104, and the light emitting element 102. At least an oscillator 103 that outputs a transmission signal, and the receiving side amplifies a light receiving element 109 that detects light leaked from the optical fiber 104 and performs optical / electrical conversion, and a weak current detected by the light receiving element 109 An amplifying circuit 105, a bandpass filter 106 that removes an unnecessary frequency from the amplified current waveform, a rectifying circuit 107 that rectifies the extracted specific frequency, and a comparator that compares the rectified signal with a communication signal on the transmission side 108 and a determination unit 110 that determines the result of the comparison.

 In the case of performing the cardiac contrast inspection in the cardiac contrast device 100 having such a configuration, light (for example, 1.55 μm) modulated at a low frequency (generally 270 Hz) is transmitted from the oscillator 103 on the transmission side. The light is converted into light by the light emitting element 102 and is incident on one end of a target optical fiber.

 On the receiving side, one optical fiber is pulled out from a plurality of optical fibers, bent to a part of the optical fiber, and leaked light leaking from the bent part is received by a light receiving element (for example, a PD (photo diode)). To do. From the signal optical / electrically converted by the light receiving element 109, a component near the same frequency as the incident light (generally 270 Hz is high) is extracted by the band pass filter 106 and is converted into a direct current by the rectifier circuit 107. The DC-converted signal is compared with the level of the same frequency component as that of the incident light by the comparator 108. If the frequency components match, it is determined that the signal is a contrast object, and if not, it is determined that the signal is not a contrast object. If it is determined that the object is not the control object, the next optical fiber is pulled out and the core control is repeated by the series of operations described above. In this way, the cord is controlled.

 Next, the configuration and operation of the hot-line determination device 111 will be described with reference to FIG. The live line discrimination device 111 has substantially the same configuration as the core wire contrast device 100. The difference is that the oscillator 103 of the core line contrast device 100 is replaced with the communication signal 112, and the band pass filter 106 and the rectifier circuit 107 of the core wire contrast device 100 are not required. In order to equalize the signal, the band pass filter 106 and the rectifier circuit 107 may be replaced with a low pass filter.

 In the case of performing live line discrimination in the hot line discrimination device 111 having such a configuration, first, an electrical signal is output from the transmission-side communication signal 112 to the light emitting element 102, and the light emitting element 102 converts the electrical signal into an optical signal. To do. Then, this optical signal is made incident on one end of an optical fiber whose live line is to be discriminated. On the receiving side, a part of the optical fiber whose live line is to be discriminated is bent, and the leaked light is received by the light receiving element 109. The light receiving element converts this optical signal into an electrical signal. This electric signal is determined by a comparator to determine whether the level is above a certain reference level. If it is determined to be above the reference level, it is determined to be a live line, and if it is determined to be below the reference level, Judged as inactive. In this way, live line determination is performed.

 In the above-described core wire contrast device 100 and the hot wire discrimination device 111, the bending portion 120 shown in FIG. 10 is usually used to generate leaked light from the optical fiber.

 The bent portion 120 has a configuration in which the convex portion 121 and the concave portion 122 are fitted. The optical fiber 124 is sandwiched between the convex portion 121 and the concave portion 122, and leakage light is generated by bending. is there. The generated leaked light is received by the light receiving element 123 provided in either one of the convex portion 121 or the concave portion 122, thereby realizing a cord contrast. In addition, when performing live line discrimination, a live line state can be detected by receiving communication light with the light receiving element 123.

 By the way, the intensity distribution of the leaked light differs depending on the transmission direction of the optical signal. Therefore, in FIG. 10, when the transmission direction goes from left to right, the leaked light intensity distribution is weakly detected by the curve before the light receiving element 123 and is strongly detected by the curve after the light receiving element 123 is exceeded. A method of determining the transmission direction as shown in FIGS. 11A and 11B using this phenomenon has been proposed.

 The bent portion 130 has a configuration in which the curves of the convex portion 131 and the concave portion 132 are left-right asymmetric. With such a configuration, the amount of leaked light that can be received by the light receiving element 133 varies depending on the direction of incidence, so that one optical fiber 134 is moved in the left and right directions one by one (total) It is possible to determine the transmission direction from the difference between the two levels. This technique is disclosed in Non-Patent Document 1.

 Further, a bent portion 140 having the configuration shown in FIG. 12 has been proposed by utilizing this phenomenon. A light receiving element 145 and a light receiving element 146 are provided in the concave portion 142 of the bent portion 140, and the transmission direction is determined by comparing the received light intensity. For example, if the signal light intensity detected by the light receiving element 145 is Pa and the signal light intensity detected by the light receiving element 146 is Pb, the transmission direction of the signal light propagates from left to right when Pa <Pb. , Pa> Pb, it can be determined that the transmission direction of the signal light propagates from right to left.

 As another conventional technique, there is a detection method shown in FIGS. In this method, a new bend is applied to the optical fiber 150 to determine the transmission direction based on the increase or decrease in loss. As shown in the figure, a bending means for giving an appropriate loss is provided on one side or both sides of a specific portion of the optical fiber 150 for detecting leakage of signal light, and a state in which a new bending is added by this means and a state in which no bending is applied The transmission direction is determined by comparing the signal light intensities in

 For example, assume that the signal light intensity detected by the light receiving element 151 in the state of FIG. 13A is Pc, and the signal light intensity detected by the light receiving element 151 in the state of FIG. 13B is Pd. As shown in FIG. 13B, when a bend imparting a is added to the left side of the light receiving element 151, when signal light is transmitted from left to right, signal light detection is performed after loss due to bending occurs. , Pc> Pd. When signal light is transmitted from right to left, Pc = Pd because loss due to bending occurs after signal light detection. Therefore, the transmission direction of the signal light can be determined by comparing Pc and Pd.

 If it is desired to suppress the bending loss to a certain level, a jig that adds a certain bending loss may be used. In particular, when the loss level is not an issue, the determination can be made even if the operator manually bends the optical fiber appropriately.

FIG. 14 is a diagram showing an example of the configuration of a method for further improving the transmission direction determination accuracy of FIG. A difference from FIG. 13 is that a bend (bend imparting a and bend imparting b) is provided on both sides of a part where signal light leakage is detected. In such a configuration, when the signal light intensity detected by the light receiving element 151 in the state of FIG. 14A is Pe and the signal light intensity detected in the state of FIG. 14B is Pf, when Pe <Pf It can be determined that the signal light transmission direction is propagating from left to right, and when Pe> Pf, the signal light transmission direction is propagating from right to left.
JP 2003-180008 A "NTT National 2002 No. 2004 Optical Fiber Control Receiver"

  By the way, in the transmission direction discrimination method shown in FIG. 11, it is necessary to repeat the measurement at least twice to perform the direction discrimination. Therefore, there is a problem that the measurement work time is twice and it is not efficient.

  In addition, there is a problem in that, when there is not a sufficient extra length depending on the laying state of the optical fiber, a sufficient working space cannot be secured and the measurement in the left and right direction may not be possible.

  On the other hand, in the method shown in FIG. 12, two light receiving elements are used to determine the transmission direction of the signal light. However, the light receiving elements are generally expensive parts, and an electric / optical conversion circuit is attached to each light receiving element. However, there is a problem that the cost of the entire apparatus increases.

  Further, in the method shown in FIG. 13 and FIG. 14, since loss must be added by a new bending, there is a problem that it may not be detected accurately when it is necessary to suppress the loss due to bending to a low level. There is.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an optical fiber core wire contrast device and an optical fiber core wire contrast method capable of improving work efficiency and suppressing product cost. .

  In order to solve the above-mentioned problem, the present invention according to claim 1 is an optical fiber core wire that measures the intensity of light leaking from a bent optical fiber by sandwiching a part of the optical fiber between the convex part and the concave part. In the control device, the concave portion or the convex portion includes a light receiving element that receives leaked light, and the convex portion or the concave portion includes a hollow portion inside, and the hollow portion is opened at a position facing the light receiving element. The first light intake port and the second light intake port that are opened on the optical fiber on both the left and right sides of the opening portion, and the first and second light intake ports. The gist is to include at least first light guide means and second light guide means for guiding leaked light to the light receiving element, and blocking means for blocking leaked light taken in from one light intake port.

  According to the second aspect of the present invention, the blocking means is an impermeable plate that does not transmit light, and an optical path that guides leaked light taken in from the first light intake port to the light receiving element via the first light guide means, or The gist of the present invention is that it is a switchable plate that blocks either one of the optical paths that guide the leaked light taken in from the second light intake port to the light receiving element via the second light guide.

  According to a third aspect of the present invention, there is provided an optical fiber core wire comparison method for measuring the intensity of light leaking from a bent optical fiber by sandwiching a part of the optical fiber between a convex portion and a concave portion. A step of applying a bend to a part of the fiber, and a first light intensity measuring step of measuring the intensity of leaked light leaking from a first intake port provided on one side centering on the tip of the bent concave portion And a second light intensity measurement step for measuring the intensity of leaked light leaking from the second intake port provided on the other side centering on the tip of the recess, and the light intensity measured by the first light intensity measurement step And a step of comparing the light intensity measured by the second light intensity measurement step.

  The present invention according to claim 4 is an optical fiber core-line contrast device for measuring the intensity of light leaking from a bent optical fiber by sandwiching a part of the optical fiber between the convex part and the concave part. Includes a first opening and a second opening for taking in leaked light that is opened on both sides centering on the tip of a concave portion to bend, and the first and second openings are continuously provided on the light receiving element surface. At least a sliding means for sliding is provided, and the convex portion includes a sliding means that slides in conjunction with the concave portion, and the convex portion, the concave portion, and the optical fiber are held in a state where a part of the optical fiber is gripped by the convex portion and the concave portion. The gist of the present invention is to receive the leaked light through the first and second openings provided in the recess by sliding on the surface of the light receiving element integrally.

  A fifth aspect of the present invention is an optical fiber core wire contrast device for measuring the intensity of light leaking from a bent optical fiber by sandwiching a part of the optical fiber between the convex portion and the concave portion. Includes a first opening and a second opening for taking in leaked light that is opened on both sides centering on the tip of a concave portion to bend, and the first and second openings are continuously provided on the light receiving element surface. With at least sliding means for sliding, in a state where a part of the optical fiber is gripped by the convex portion and the concave portion, only the concave portion is slid to receive the leaked light through the first and second openings provided in the concave portion. Is the gist.

  The present invention according to claim 6 is an optical fiber core wire contrast device for measuring the intensity of light leaking from a bent optical fiber by sandwiching a part of the optical fiber between the convex part and the concave part. Includes a first opening and a second opening for taking in leaked light that is opened on both sides around the tip of a concave portion that imparts bending, and the light receiving unit that receives the leaked light has the first and second openings. With sliding means passing continuously through the first and second openings on the first and second openings provided in the concave portion with the convex portion and concave portion holding a part of the optical fiber. The gist is to receive each leakage light.

  According to the present invention, it is possible to discriminate the transmission direction or perform the core line contrast detection by one measurement using one light receiving element, so that the light that can improve the working efficiency and suppress the product cost. A fiber core contrast device and an optical fiber core contrast method can be provided.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram showing a cross-sectional structure of a bending portion 1 provided in an optical fiber core line contrast device or an optical fiber live line discrimination device according to an embodiment of the present invention. In addition, although unified and demonstrated below with an optical fiber core wire contrast apparatus, this invention is applicable also to a hot-wire discrimination apparatus.

  The bent portion 1 includes a convex portion 2 and a concave portion 3 that sandwich a part of the optical fiber 9, and the concave portion 3 is provided with a light receiving element 10 that receives leaked light. The convex portion 2 is provided with a hollow portion 4 therein. The hollow portion 4 includes a second opening portion 8d opened at a position facing the first opening portion 8c, and left and right sides of the second opening portion. The first and second light intake ports 8a and 8b opened on both sides and opened on the optical fiber 9, and the leaked light taken from the first and second light intake ports 8a and 8b are received by the light receiving element 10. The first and second light guiding means 5 and 6 for guiding the light to the light and the switching means 7a for blocking the leaked light taken in from one of the two light intakes.

  Here, the first and second light guides 5 and 6 are for coupling the leaked light taken in from the light inlets 8a and 8b to the light receiving element 10, and include, for example, a mirror.

  When, for example, a mirror is used as the light guide means, it is necessary to set the angle of the mirror to an angle at which the leaked light taken in by the first light intake port 8a is coupled to the light receiving element 10. Similarly, the second light guide means 6 needs to be set to an angle at which the leaked light taken in by the second light inlet 8b is coupled to the light receiving element 10.

  When the first and second mirrors 5 and 6 are provided as described above, the leaked light from each light intake port is simultaneously guided to the light receiving element 10. Therefore, a blocking means 7a is provided in order to guide only one leakage light to the light receiving element 10.

  This blocking means 7a only needs to block one leakage light among the leakage lights reflected by the first and second mirrors 5 and 6 and guide only the other leakage light to the light receiving element 10, for example, An open / close door that directly covers the light inlet, a plate-like switching plate that blocks light reflected by a mirror, and the like can be given.

  Here, when the switching plate is applied as the blocking means 7a, the switching plate is disposed between the two C-shaped mirrors 5 and 6, and the two mirrors with the rotation shaft 7b as an axis. Switch between them like a wiper. With such a configuration, it is possible to efficiently block two leakage lights with one switching plate.

  Next, the operation of the bending portion 1 having the above configuration will be described with reference to FIG.

  FIGS. 2A and 2B are schematic diagrams illustrating states in which the leakage light captured from the first light capturing port and the leakage light captured from the second light capturing port are switched using the switching plate.

  As shown in FIG. 2A, the switching plate is arranged on the left side of the light receiving element 10 with the rotation shaft 7b as an axis, so that the leakage light from the first light intake port 8a can be blocked by the switching plate. it can. On the other hand, the leaked light from the second intake port that is not blocked is reflected by the second mirror 6 and guided to the light receiving element 10.

  Next, when this switching plate is arranged on the right side of the light receiving element 10, as shown in FIG. 2B, the leaked light taken in from the second light intake port 8b is blocked by the switching plate, Although it does not reach, the leaked light taken in from the first take-in port is reflected by the first mirror 5 and guided to the light receiving element 10.

  Here, as shown in FIG. 2 (a), the light intensity of the leaked light received when the switching plate is arranged on the left side is strong, and the switching plate is arranged on the right side as shown in FIG. 2 (b). When the light intensity of the leaked light received at the time is weak, it can be determined that the transmission direction of the signal light propagating through the optical fiber 9 is propagating from left to right.

  On the other hand, as shown in FIG. 3 (a), the light intensity of the leaked light received when the switching plate is arranged on the left side is weak, and the switching plate is arranged on the right side as shown in FIG. 3 (b). When the light intensity of the leaked light received at the time is weak, it can be determined that the transmission direction of the signal light propagating through the optical fiber 9 is propagating from right to left.

  According to the bending portion 1 having the above-described configuration, the transmission direction can be reliably determined by switching the switching plate to the left and right in one measurement and determining the level difference of the received light intensity at that time. At this time, since the switching plate is provided, one light receiving element 10 is completed, and the manufacturing cost of the apparatus can be suppressed.

  In FIG. 1, the hollow portion 4 is provided inside the convex portion 2. However, the present invention is not limited to this, and the same effect as described above can be obtained even if it is provided inside the concave portion 3.

  Next, with reference to FIG. 4, the control apparatus which controls this bending part 1, and the determination method of the transmission direction by this control apparatus are demonstrated.

  This control device is roughly divided into a transmission side and a reception side. The transmission side is a conventional optical fiber 9, a light emitting element 11 connected to one end of the optical fiber 9, and an electric signal output to the light emitting element 11. The transmitter circuit (for example, the transmitter 103 in FIG. 8) 12 and the bending portion 1 for bending the optical fiber 9 are configured at least.

  On the other hand, the receiving side receives the leaked light from the bending section 1 and converts it into an electric signal, an amplifier circuit 13 for amplifying the electric signal, and a conventional receiving section circuit 19 (for example, a bandpass filter in FIG. 8). 106, a rectifier circuit 107, a comparator 108, etc.), and first and second level storage circuits 14 and 15 for acquiring and storing the signal amplified by the amplifier circuit 13, and the first and second levels. The comparator 17 that compares the levels stored in the storage circuits 14 and 15, the transmission direction determination unit 18 that determines the transmission direction of communication light from the comparison result, and the switching control of the switching plate provided in the bending unit 1 are performed. A switching plate switching circuit 16 for transmitting the switching direction to the first and second memory circuits 14 and 15 is also provided.

  In such a configuration, the switching plate switching circuit 16 blocks the leakage light from one light intake port of the switching plate provided in the bending portion 1 and receives the other leakage light. At this time, the first level storage circuit 14 is fixed in a recordable state, and the light intensity received by the light receiving element 10 is recorded in the first level storage circuit 14.

  Similarly, the switching plate provided in the bending portion 1 is switched to block the leaked light from the other light intake port and receive the other leaked light. At this time, the second level storage circuit 15 is fixed in a recordable state, and the light intensity received by the light receiving element 10 is recorded in the second level storage circuit 15.

  With such a configuration, the light reception level when the switching plate is switched can be stored in the first and second storage circuits 14 and 15, respectively. Can be determined.

  As specific implementation methods of the first and second level storage circuits 14 and 15, for example, a method of applying a peak hold circuit by an analog circuit, or a digital value subjected to A / D conversion is stored by a CPU or the like. Methods and the like.

  Therefore, by providing the bending portion 1 having the above-described configuration and a control circuit for controlling the bending portion 1 in the core line contrast device or the hot wire discrimination device, the core wire contrast can be performed with one light receiving element and in one measurement. Alternatively, it is possible to simultaneously determine the transmission method while performing live line determination.

  Next, the configuration of the bending portion 20 according to the second embodiment will be described with reference to FIG.

  The bent portion 20 is composed of a convex portion 21 and a concave portion 22 that sandwich a part of the optical fiber, and the convex portion 21 and the concave portion 22 are halfway in the left-right direction together with the optical fiber that is sandwiched around the rotating shaft 23. It has a rotating structure.

  The recess 22 has two openings, and one light receiving element for receiving leakage light is provided on a locus drawn when the opening swings to the left and right.

  That is, the bending portion 20 has a convex portion 21 and a concave portion 22 that sandwich a part of the optical fiber, and the concave portion 22 has a first opening portion 22a and a second opening portion for allowing leakage light leaking from the sandwiched optical fiber to pass therethrough. 22b. The first opening 22 a and the second opening 22 b are opened in accordance with the positions where the weak leakage light and the strong leakage light shown in FIG. 10 are generated, and the opening area is about the same as the light receiving surface of the light receiving element 24. Has an area. The recess 22 is further provided with a rotating shaft 23 for swinging the recess itself in the left-right direction, and the recess 22 is configured to rotate half like a pendulum around this shaft.

  On the other hand, the convex portion 21 is also provided with a rotation shaft 23, and is configured to rotate halfway like a pendulum about the rotation shaft 23. Such a convex portion 21 is further provided with a vertical driving portion 25 that enables vertical movement. The convex portion 21 moves up and down by the control of the vertical driving portion 25, and the concave portion 22 and the convex portion 21. Can be fitted.

  The bent portion 20 is provided with a single light receiving element 24. The light receiving element 24 is on the locus of the first and second openings 22a and 22b drawn when swinging about the rotation shaft 23. Installed.

  Next, the operation of the bent portion 20 will be described with reference to FIGS. First, as shown in FIG. 5A, in a state where the convex portion 21 and the concave portion 22 are separated by the control of the vertical drive unit 25, a part of the optical fiber 26 is disposed in the concave portion 22, and the convex portion 21 is gently lowered. Let me sandwich.

  Next, as shown in FIG. 5B, inspection light is incident from one end of the optical fiber 26 sandwiched. Since the incident inspection light leaks from the bent portion provided when passing through the bent portion 20, the light intensity of the leaked light is adjusted by matching the position of the first opening 22a with the position of the light receiving element 24 at this time. taking measurement.

  Next, as shown in FIG. 5C, the optical fiber 26, the convex portion 21, and the concave portion 22 are integrally rotated in the direction of the arrow with the rotation shaft 23 as an axis.

  Then, as shown in FIG. 5D, when the opening surface of the second opening portion 22b coincides with the light receiving surface of the light receiving element 24, the light intensity of the leaked light is measured again.

  Here, when such a bending portion 20 is incorporated in the control unit shown in FIG. 4, the light intensity received at the first opening surface and the light intensity received at the second opening portion can be respectively acquired and compared. Therefore, the transmission direction can be determined from the result.

  According to the above configuration, as shown in FIGS. 13 and 14, it is possible to perform live line discrimination or core line contrast with one light receiving element without adding new loss to the optical fiber.

  Next, the configuration of the bending portion 30 according to the third embodiment will be described with reference to FIG.

  The bent portion 30 has a structure similar to that of the bent portion 20 shown in FIG. 5, but the bent portion 20 is fixed in that the convex portion 31 and the light receiving element 34 are fixed and only the concave portion is half-rotated. And different.

  That is, the bent portion 30 is composed of a convex portion 31 and a concave portion 32 that sandwich a part of the optical fiber, and is configured to swing only the concave portion 32 around the rotation shaft 33 provided in the concave portion 32. .

  With such a configuration, the optical fiber can be added while gradually changing the bending by swinging only the recess 32, so that the two types can be efficiently performed without causing the protrusion 31 and the recess 32 to rotate halfway together. The light intensity of the leaked light can be detected.

  Next, with reference to FIGS. 6A to 6D, the operation of the bent portion 30 will be described. First, as shown in FIG. 6A, in a state where the convex portion 31 and the concave portion 32 are separated by the control of the vertical drive unit 35, a part of the optical fiber 36 is disposed in the concave portion 32 and the convex portion 31 is gently lowered. Let me sandwich.

  Next, as shown in FIG. 6B, inspection light is incident from one end of the sandwiched optical fiber 36. When the inspection light passes through the bending part 30, light is leaked at the applied bending part. At this time, the light intensity of the leakage light is measured by matching the position of the opening and the position of the light receiving element 34. To do. Here, let this opening part be the 1st opening part 32a.

  Next, as shown in FIG. 6 (c), only the concave portion 32 is slid in the direction of the arrow in the drawing along the curved surface of the convex portion 31 with the rotation shaft 33 as an axis.

  Then, as shown in FIG. 6D, after the opening surface of the second opening portion 32b is slid until it coincides with the light receiving surface of the light receiving element 24, the light intensity of the leaked light from the second opening portion is measured. .

Here, when such a bending portion 30 is incorporated in the control unit shown in FIG. 4, the light intensity received at the first opening surface and the light intensity received at the second opening portion can be respectively acquired and compared. Therefore, the transmission direction can be determined from the result.
According to the above configuration, as shown in FIG. 13 and FIG. 14, it is possible to perform core line contrast or live line discrimination with one light receiving element without adding new loss to the optical fiber, and the concave portion 32. Therefore, it is possible to efficiently perform the contrast control or the live line discrimination with a simpler configuration.

  Next, with reference to FIG. 7A, the configuration of the bending portion 40 according to the fourth embodiment will be described.

  The bent portion 40 has a structure similar to that of the bent portions 20 and 30 shown in FIGS. 5 and 6, but the convex portion 41 and the concave portion 42 are fixed, and only the light receiving element 44 is half-rotated. It differs from the said bending parts 20 and 30 by the point.

  That is, the bent portion 40 is composed of a convex portion 41 and a concave portion 42 that sandwich a part of the optical fiber, and only the pendulum portion 47 including the light receiving element 44 with the rotation shaft 43 as an axis is provided in the concave portion 42. The first and second openings 42a and 42b are configured to swing along the surface on which the first and second openings 42a and 42b are provided.

  With such a configuration, by swinging only the pendulum portion 47, it is possible to detect the light intensities of the two types of leaked light without causing the convex portion 31 and the concave portion 32 to rotate halfway together.

  Next, with reference to FIGS. 7A to 7D, the operation of the bent portion 40 will be described. First, as shown in FIG. 7A, in a state where the convex portion 41 and the concave portion 42 are separated by the control of the vertical drive unit 45, a part of the optical fiber 46 is disposed in the concave portion 42 and the convex portion 41 is gently lowered. Let me sandwich.

  Next, as shown in FIG. 7B, inspection light is incident from one end of the sandwiched optical fiber 46. When the inspection light passes through the bending portion 40, the intensity of the light leaking before and after the bending-applied portion changes. Therefore, first, the pendulum portion 47 is set to one of the opening portions. Leaked light leaking from the opening is received by the light receiving element 44 provided in the pendulum portion 47. Here, let this opening part be the 1st opening part 42a.

  Next, as shown in FIG. 7C, the pendulum portion 47 is slid in the direction of the arrow in the drawing along the curved surface of the recess 42 around the rotation shaft 43.

  Then, as shown in FIG. 7 (d), after sliding the opening surface of the second opening 42 b until it matches the light receiving surface of the light receiving element 44, the light intensity of the leaked light from the second opening is measured. .

Here, when such a bending portion 40 is incorporated into the control unit shown in FIG. 4, the light intensity received by the first opening surface 42a and the light intensity received by the second opening portion 42b are respectively acquired and compared. Therefore, the transmission direction can be determined from the result.
According to the above configuration, as shown in FIG. 13 and FIG. 14, it is possible to perform live line discrimination or core line contrast with one light receiving element without adding new loss to the optical fiber, and further, Since only the pendulum portion 47 needs to be half-rotated in a state where the fiber is fixed, it is possible to perform live line determination or core line contrast having high reliability with a simpler configuration.

It is a figure which shows the structure of the bending part 1 with which the optical fiber core wire contrast apparatus which concerns on embodiment of this invention, or an optical fiber hot-wire discrimination | determination apparatus is equipped. It is a figure which shows the effect | action of the bending part 1 with which the optical fiber core wire contrast apparatus which concerns on embodiment of this invention, or an optical fiber hot wire discrimination | determination apparatus is equipped. It is a figure which shows the effect | action of the bending part 1 with which the optical fiber core wire contrast apparatus which concerns on embodiment of this invention, or an optical fiber hot wire discrimination | determination apparatus is equipped. It is a figure which shows the structure of the optical fiber core wire contrast apparatus which concerns on embodiment of this invention, or an optical fiber hot wire discrimination | determination apparatus. It is a figure explaining the structure and effect | action of the bending part 20 which concern on the 2nd Embodiment of this invention. It is a figure explaining the structure and effect | action of the bending part 30 which concern on the 3rd Embodiment of this invention. It is a figure explaining the structure and effect | action of the bending part 40 which concern on the 4th Embodiment of this invention. It is a figure which shows the structure of the conventional optical fiber hot wire identification apparatus. It is a figure which shows the structure of the conventional optical fiber core wire contrast apparatus. It is a figure which shows the structure of the bending part 120 with which the conventional optical fiber core wire contrast apparatus or an optical fiber hot wire discrimination | determination apparatus is equipped. It is a figure which shows the structure of the other conventional bending part. It is a figure which shows the structure of the other conventional bending part 140. FIG. It is a schematic diagram which shows the detection method for detecting the propagation direction of the conventional signal light. It is a schematic diagram which shows the other detection method for detecting the propagation direction of the conventional signal light.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 20, 30, 40 ... Bending part 2, 21, 31, 41 ... Convex part 3, 22, 32, 42 ... Concave part 4 ... Hollow part 5 ... 1st mirror (1st light guide means)
6 ... 2nd mirror (2nd light guide means)
7a ... Switching means (blocking means)
7b: Rotating shaft 8a: First light capturing port 8b: Second light capturing port 8c: First opening 8d: Second opening 9: Optical fiber 10: Light receiving element 11: Light emitting element 13: Amplifying circuit 14: First Level memory circuit 15 ... second level memory circuit 16 ... switching plate switching circuit 17 ... comparator 18 ... transmission direction determining unit 19 ... receiving unit circuit 22a, 32a, 42a ... first opening 22b, 32b, 42b ... second opening 23, 33, 43 ... rotating shaft 24, 34, 44 ... light receiving element 25, 35, 45 ... vertical drive unit 26, 36, 46 ... optical fiber

Claims (6)

A fiber optic contrast device that sandwiches a part of an optical fiber between a convex part and a concave part and measures the intensity of light leaking from the optical fiber to which bending is applied,
The concave portion or the convex portion includes a light receiving element that receives leakage light,
The convex portion or the concave portion has a hollow portion therein, and the hollow portion is opened on the optical fiber on both the left and right sides of the opening, and an opening that is opened at a position facing the light receiving element. First light inlet and second light inlet, and first and second light guiding means for guiding leakage light taken from the first and second light inlets to the light receiving element, An optical fiber optical fiber contrast device comprising at least blocking means for blocking leaked light taken from one of the light inlets.   The blocking means is an impermeable plate that does not transmit light, and an optical path that guides leaked light taken in from the first light intake port to the light receiving element via the first light guide means, or the second light 2. The optical fiber according to claim 1, wherein the optical fiber is a switchable plate that blocks one of the optical paths that guide the leaked light taken in from the take-in port to the light receiving element via the second light guide. Core wire contrast device. An optical fiber core wire contrast method for sandwiching a part of an optical fiber between a convex part and a concave part and measuring the intensity of light leaking from the optical fiber to which bending is applied,
A step of applying a bend to a part of the optical fiber, and a first light intensity measurement for measuring the intensity of leaked light leaking from a first intake port provided on one side around the tip of the recessed portion provided with the bend Measured by a first light intensity measuring step, a second light intensity measuring step for measuring the intensity of leaked light leaking from a second intake port provided on the other side around the tip of the concave portion A method for comparing optical fiber cores, comprising comparing the light intensity with the light intensity measured by the second light intensity measurement step. A fiber optic contrast device that sandwiches a part of an optical fiber between a convex part and a concave part and measures the intensity of light leaking from the optical fiber to which bending is applied,
The concave portion includes a first opening and a second opening for taking in leaked light that is opened on both sides around the tip of the concave portion to bend, and the first and second openings are continuous on the light receiving element surface. And at least sliding means for sliding,
The convex portion includes sliding means that slides in conjunction with the concave portion,
First and second portions provided in the concave portion by sliding the convex portion, the concave portion and the optical fiber together on the light receiving element surface in a state where a part of the optical fiber is gripped by the convex portion and the concave portion. An optical fiber optical fiber contrast device, wherein leaked light is received through an opening. A fiber optic contrast device that sandwiches a part of an optical fiber between a convex part and a concave part and measures the intensity of light leaking from the optical fiber to which bending is applied,
The concave portion includes a first opening and a second opening for taking in leaked light that is opened on both sides around the tip of the concave portion to bend, and the first and second openings are continuous on the light receiving element surface. And at least sliding means for sliding,
In a state where a part of the optical fiber is gripped by the convex portion and the concave portion, only the concave portion is slid and leaked light is received through first and second openings provided in the concave portion. Optical fiber core wire contrast device. A fiber optic contrast device that sandwiches a part of an optical fiber between a convex part and a concave part and measures the intensity of light leaking from the optical fiber to which bending is applied,
The concave portion includes a first opening and a second opening for taking in leaked light that is opened on both sides around the leading end of the concave portion that imparts bending,
The light receiving portion that receives the leaked light includes sliding means that passes through the first and second openings continuously,
In a state where a part of the optical fiber is gripped by the convex portion and the concave portion, only the light receiving portion is continuously slid on the first and second opening surfaces provided in the concave portion to receive each leakage light. An optical fiber core wire contrast device characterized in that:

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