JP2012226167A - Optical sensor system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical sensor system which has a simple configuration, is easy to construct and inexpensive, and is capable of detecting a suspicious person.SOLUTION: An optical sensor system 1 includes a displacement mechanism 2 which is displaced in accordance with the amount of flexure of a wire W, an optical fiber 3 which is disposed so as to have the degree of curvature varied in accordance with the operation of the displacement mechanism 2, and a light quantity detection unit 4 for detecting the change in quantity of light transmitted through the optical fiber 3. When the wire W is bent, movement in a vertical direction and movement in a horizontal direction of the wire W are caused. The displacement mechanism 2 uses a rotating lever or a moving lever to bend the optical fiber 3 in accordance with the change in tension and magnitudes of movement in the vertical direction and the horizontal direction of the wire, namely, the amount of flexure of the wire W. Since the amount of flexure of the wire W is detected by the optical fiber 3 and the light quantity detection unit 4 via the operation of the displacement mechanism, the wire W and the optical fiber 3 can be disposed individually, and the system is easy to construct, and an intrusion detection system can be constructed at a low cost by using general optical fibers and wires.

Description

  The present invention relates to an optical sensor system that detects an intrusion of a suspicious person using an optical fiber.

  Conventionally, as an optical sensor system for detecting the intrusion of a suspicious person, an optical fiber cable is arranged along the boundary of an area, and the fact that a suspicious person applies force to the cable is detected from a change in the amount of light transmitted through the optical fiber. A sensor system is known (see, for example, Patent Document 1). An optical fiber cable in such a system is a composite cable formed by enclosing and covering a metal wire and an optical fiber, and is arranged between a plurality of support columns while being wound around a fixture. When a suspicious person applies a force to such an optical fiber cable, a displacement in a direction perpendicular to the direction of the wire of the optical fiber cable occurs, and the tension increases, so that the microbending of the optical fiber at the portion wound around the fixture is increased. Increases the transmission loss of the optical fiber. An intruder is detected by detecting the increase in the transmission loss.

  In addition, an optical fiber is arranged at a location where strain is detected on slopes and structures such as mountains and cliffs, and the fact that the optical fiber's radius of curvature changes due to strain increases and decreases the amount of transmitted light. A strain sensor that detects strain is known (see, for example, Patent Document 2). The optical fiber of this sensor is arranged in a tension state, and forms a circular loop with a predetermined radius of curvature in a part of the optical fiber as a strain detection location, and a plate spring wound in a cylindrical shape inside the circular loop. It is configured to be attached and to elastically support the circular loop variably. As the strain occurs, the tension acting on the optical fiber changes, and the change in tension increases or decreases the radius of curvature of the circular loop, which increases or decreases the amount of light transmitted through the optical fiber. Detected.

JP-A-5-233969 JP 2000-298010 A

  However, in the optical sensor system as shown in Patent Document 1 described above, it is necessary to arrange a composite cable composed of a metal wire and an optical fiber in consideration of the tension acting on the optical fiber. It takes. Moreover, it is necessary to prepare a dedicated composite optical fiber cable, which makes it difficult to reduce the material cost. In addition, in the strain sensor as shown in Patent Document 2, it is necessary to dispose the strain sensor in consideration of the tension acting on the optical fiber, which requires a lot of work.

  The present invention solves the above-described problems, and an object of the present invention is to provide an optical sensor system that is easy to construct and can realize a suspicious person detection system at low cost.

  In order to achieve the above object, an optical sensor system of the present invention is an optical sensor system for detecting an intrusion of a suspicious person, and is displaced according to a deflection amount of a wire disposed in an area for detecting the intrusion. A displacement mechanism, an optical fiber disposed so that the degree of bending changes in conjunction with the operation of the displacement mechanism, and a light amount detection unit that detects a change in the amount of light transmitted through the optical fiber. .

  The optical sensor system may include a spring that applies tension to the wire.

  In this optical sensor system, the displacement mechanism may include a rotation lever that rotates by bending of the wire, and the optical fiber may be bent by the rotation of the rotation lever.

  In this optical sensor system, the rotation lever may have a variable rotation axis position.

  In this optical sensor system, the displacement mechanism may include a moving lever that moves in a lateral direction with respect to the wire by the deflection of the wire, and the optical fiber may be bent by the movement of the moving lever.

  The optical sensor system includes a detector housing that houses the displacement mechanism and one end of the wire, and the detector housing is adjacent to each other when a plurality of pairs of the displacement mechanism and the wire are arranged in series with each other. There may be a fixing portion for connecting and fixing the other end of the wire to be detected by the displacement mechanism in the detector housing.

  In this optical sensor system, a relationship table between the tension of the wire and the amount of deflection may be provided so that it can be referred to.

  In this optical sensor system, the displacement mechanism may include a buffer member that limits the bending of the optical fiber with respect to the deflection amount when the tension acting on the wire is equal to or less than a predetermined value.

  In this optical sensor system, the light amount detection unit may include a variable attenuator that adjusts the amount of light transmitted through the optical fiber.

  According to the optical sensor system of the present invention, since the deflection amount of the wire is detected by the optical fiber and the light amount detection unit through the operation of the displacement mechanism, the wire and the optical fiber can be disposed separately. The construction is easy, and a composite cable is unnecessary, so that the cost can be reduced.

The block block diagram about the optical sensor system which concerns on one Embodiment of this invention. The side view explaining operation | movement of the wire in the system. The whole block diagram in the field of the system. (A) is an internal front view of the detector in the system, (b) is a front view of the operating state of the detector. (A) is an internal front view of the modification of the detector in the system, (b) is a front view of the operation state of the modification. (A) is an internal front view of the other modification of the detector in the system, (b) is a front view of the operation state of the modification. (A) is an internal front view of the further another modification of the detector in the system, (b) is a front view of the operation state of the modification. The internal front view of the further another modification of the detector in the same system. The front view which shows a mode that the detector of FIG. 8 was applied to the field. (A) is an internal front view of the further another modification of the detector in the system, (b) is a front view of the operation state of the modification. (A) is a figure explaining the light quantity detection part and optical fiber in the system, (b) is a figure explaining the modification.

  Hereinafter, an optical sensor system according to an embodiment of the present invention will be described with reference to the drawings. 1 to 4 show an embodiment of the optical sensor system 1. As shown in FIG. 1, the optical sensor system 1 includes a displacement mechanism 2 that is displaced according to the deflection amount of the wire W, and an optical fiber that is disposed so that the degree of bending changes in conjunction with the operation of the displacement mechanism 2. 3 and a light amount detection unit 4 that detects a change in the amount of light transmitted through the optical fiber 3. The displacement mechanism 2 and the part where the bending degree of the optical fiber 3 changes constitutes the detector 5. The wire W is arranged with tension. When the wire W is bent, the tension changes, and the wire W moves in the vertical direction (wire direction) and the horizontal direction (wire direction orthogonal). Movement occurs. The displacement mechanism 2 uses an optical fiber using a rotating lever or a moving lever that rotates or moves according to the change in the tension of the wire W or the magnitude of the vertical or horizontal movement, that is, the amount of deflection. 3 is bent. The light amount detection unit 4 detects the change in the amount of light transmitted through the optical fiber 3 and detects the intrusion of a suspicious person by receiving the transmitted light of light input from one end of the optical fiber 3 at the other end.

  As shown in FIG. 2, both ends A and B of the wire W are fixed to a fixing portion (not shown), and a predetermined position between both ends A and B is supported movably by a passing ring 11 provided on the column 10. ing. The wire W is disposed around the boundary of the area where the intrusion of the suspicious person is detected. When the suspicious person applies an external force F to the wire W so as to cross the boundary of the area, the tension T of the wire W changes, Deflection occurs in the wire W, causing movement in the vertical direction a and movement in the horizontal direction b. The tension T exists at an arbitrary point P of the wire W so as to be balanced in opposite directions.

  As shown in FIG. 3, in a state where the optical sensor system 1 is installed, a fence including a plurality of support columns 10 and a wire mesh 12 stretched on the support columns 10 is installed at the boundary of an area where intrusion is detected. Detectors 5 are provided on the top of each column 10 for each predetermined number of columns 10, and wires W supported by the passing ring 11 are stretched between the detectors 5. The optical fiber 3 is introduced and led out to each detector 5. That is, the middle part of the optical fiber 3 is drawn. Each optical fiber 3 is optically connected to the trunk optical fiber cable 31 in the optical termination box 3a, and then connected to a light amount detector 4 installed in a monitoring room or the like. The light quantity detection unit 4 includes a light transmission unit 41 that sends light to the optical fiber 3 and a light receiving unit 42 that receives light from the optical fiber 3 to measure the amount of transmitted light and detects a change in the amount of light. It is. The light quantity detection unit 4 is connected to a general-purpose computer 40 having input / output devices such as a monitor 4a, a speaker 4b, a keyboard 4c, and a mouse 4d. By using these input / output devices and built-in devices, the computer 40 performs control of the light amount detection unit 4, operation setting, recording of past detection history, generation of an alarm when intrusion is detected, and the like.

(Rotating lever type detector)
4 (a) and 4 (b) show a rotating lever type detector 5. FIG. As shown in FIG. 4A, the detector 5 includes a detector housing 50 and a rotating lever type displacement mechanism 2 installed in the detector housing 50. One end A of the wire W and a portion where the bending degree of the optical fiber 3 changes are introduced into the detector housing 50. One end A of the wire W is introduced into the housing through an opening 5 a provided on the side wall of the detector housing 50, and is turned downward by a pulley 51 and fixed to one end of the spring 6. The wire W is given a constant tension T between one end A and the other end B by the spring 6.

  The displacement mechanism 2 includes a rotation lever 21 that is rotatable around a rotation shaft 2 a fixed to the detector housing 50, a joining member 22 provided at an upper end portion of the rotation lever 21, and a lower end portion of the rotation lever 21. And a pressing pulley 23 provided on the head. The joining member 22 is integrally fixed to the wire W between the opening 5 a and the pulley 51. A long hole is formed in the upper end portion of the rotating lever 21, and the upper end portion of the rotating lever 21 and the joining member 22 are engaged with each other by a rotating shaft 2 b that is inserted through the long hole and is erected on the joining member 22. It has been stopped. The pressing pulley 23 is fixed to the rotating lever 21 so as to be rotatable by the rotating shaft 2c. The middle portion of the optical fiber 3 is drawn into the housing through an opening 5b provided in the lower wall of the detector housing 50, and is fixed to the detector housing 50. In contact with the pressing pulley 23 and fixed to the inside of the housing in a state where a predetermined tension is applied. The rotating lever 21 stands up and down in a normal state where the wire W is not bent. Further, the optical fiber 3 in the detector housing 50 is arranged symmetrically with respect to the upright rotation lever 21.

  As shown in FIG. 4 (b), when an external force F is applied to the wire W to cause deflection, the tension T of the wire W increases to the tension T1 (T <T1), the spring 6 extends, and the wire W becomes its wire. Move in direction a. By the movement of the wire W, the joining member 22 is moved, the rotation lever 21 is rotated as indicated by an arrow R, and the pressing pulley 23 presses and bends the optical fiber 3, and the bending change portion C is generated. Accordingly, the degree of bending at the bending change portion C of the optical fiber 3 changes in conjunction with the operation of the displacement mechanism 2 due to the occurrence of deflection, and the amount of light transmitted through the optical fiber 3 changes (usually due to the change in the degree of bending). , The light intensity is attenuated). The light quantity change is detected by the light quantity detection unit 4 as described above. Based on the detection result, for example, when the light quantity change exceeds a predetermined value, it is determined that a suspicious person has entered.

  According to the optical sensor system 1 of the present embodiment, since the deflection amount of the wire W is detected by the optical fiber 3 and the light amount detection unit 4 through the operation of the displacement mechanism 2, the wire W and the optical fiber 3 Can be arranged individually, and construction is easy. In addition, since a conventional composite cable is not used, an intrusion detection system can be constructed at a lower cost using a more general-purpose general-purpose optical fiber and wire. In addition, since the tension is always applied to the wire W by the spring 6, when the wire W is cut or removed, the rotation lever 21 is in the direction opposite to the rotation direction shown in FIG. By rotating, the optical fiber 3 can be bent on the opposite side, as described above. Accordingly, it is possible to reliably detect an abnormality such as a cutting that has occurred in the wire W. In addition, since tension is applied to the wire W using the spring 6, the tension T of the wire W can be easily set to a desired value by an adjustment jig (not shown) that adjusts the elongation of the spring 6. Also, the operator can refer to the relationship table between the characteristics of the spring 6 and the deflection amount, or more generally, the relationship table between the tension T of the wire W and the deflection amount, for example, in the detector housing 50. By providing, the degree of freedom of construction spreads, and it can respond flexibly according to the construction situation.

  5A and 5B show a modification of the detector 5 described above. The detector 5 is configured such that the position of the rotary shaft 2a of the rotary lever 21 is variable in three stages. According to such an optical sensor system 1, since the rotation rate of the pressing pulley 23 with respect to the deflection of the wire W can be changed, it can be easily set so that a change in the amount of transmitted light can be detected appropriately. Therefore, depending on the installation state of the wire W, for example, the difference in the touch width of the deflection amount (the touch width of the movement amount of the wire W along the wire direction a) due to the difference in the interval between the adjacent passing rings 11 The rotation rate of the pressing pulley 23 can be set, and the optical sensor system 1 can be easily constructed. In addition, the change of the position of the rotating shaft 2a is variable not only in three steps but in arbitrary steps.

  6A and 6B show still another modification of the detector 5. In this detector 5, the rotating lever 21 is rotated based on the movement of the wire W in the direction orthogonal to the wire b, not the movement of the wire W in the wire direction a. As shown in FIG. 6 (a), the rotation lever 21 has an L-shape, a rotation shaft 2a at the corner of the L-shape, a pressing pulley 23 supported by the rotation shaft 2c at one end, An engagement pin 2d at the other end and a spring 61 are provided. The engaging pin 2d, the rotating shaft 2a, and the rotating shaft 2c are positioned at the upper, middle, and lower positions in this order. The upper engaging pin 2d is engaged with the wire W in a state where the wire W is pulled down from above. The spring 61 urges the rotating lever 21 to rotate. The rotational force is a force for the engaging pin 2d to pull down the wire W. The wire W is fixed between A and B ends (not shown) under a predetermined tension T, and is inserted into the detector housing 50 through the openings 5a provided on the left and right side walls of the detector housing 50. And is supported by a passing ring 54 (or a support pin) provided inside the opening 5a. Accordingly, the wire W is pulled down inside the detector housing 50 in a state where the tension T and the biasing force of the spring 61 are balanced. An intermediate portion of the optical fiber 3 is drawn into the housing from the opening 5b, is in contact with the two guide pins 53 and the pressing pulley 23, and is fixed inside the housing in a predetermined tension state.

  As shown in FIG. 6 (b), when the tension T of the wire W is increased by the occurrence of deflection and becomes the tension T1, the engagement pin 2d moves in the upward direction b and the rotation lever 21 is indicated by the arrow R as shown in FIG. Rotating, the pressing pulley 23 presses and bends the optical fiber 3, and a bending change portion C is generated. The spring 61 is stretched so as to balance the tension T1 (and the repulsive force from the optical fiber that is in contact with the pressing pulley 23). Such a detector 5 is not limited to the end portion of the wire W, and can be disposed at any position between both ends of the wire W. Further, the end portion of the wire W may be terminated using the spring 6 as described above or may be terminated without using the spring 6. Also in such a displacement mechanism 2, by changing the shape of the rotating lever 21 and the mounting configuration of the optical fiber 3, the action of the spring 61 when the wire W is cut or removed as described above. Thus, the optical fiber 3 can be bent.

(Moving lever type detector)
FIGS. 7A and 7B show still another modification of the detector 5. As shown in FIG. 7A, the displacement mechanism 7 of the detector 5 is provided with a vertically long moving lever 71 disposed in the center of the left and right of the detector housing 50 and a moving lever 71 downward. And an energizing spring 62. The upper and lower portions of the moving lever 71 are each provided with two engaging pins 7a arranged vertically and two engaging pins 7b arranged vertically. The wire W is inserted into the detector housing 50 and supported by the passing ring 54, similarly to the detector 5 shown in FIGS. 6 (a) and 6 (b). The intermediate portion of the optical fiber 3 is drawn into the housing from the opening 5b, and symmetrically in a predetermined tension state between the upper and lower sides of the four left and right longitudinal guide members 55 that are arranged at predetermined intervals in the vertical and horizontal directions. It is fixed. The upper and lower guide members 55 restrict the vertical movement of the optical fiber 3. The left and right guide members 55 form a gap through which the lower part of the moving lever 71 is inserted.

  The upper one of the engaging pins 7 a of the moving lever 71 engages with the wire W from above, and pushes the wire W downward based on the urging force of the spring 62. The two engaging pins 7b sandwich the optical fiber 3 from above and below, like the upper and lower guide members 55. The optical fiber 3 is located between the upper and lower guide members 55 and between the two engagement pins 7b in a normal state (a state in which there is no deflection) in which the tension T of the wire W and the biasing force of the spring 62 are balanced. Is in a state extending linearly.

  As shown in FIG. 7B, when an external force F is applied to the wire W to cause a deflection, the tension T of the wire W increases due to the deflection and becomes a tension T1. Then, an upward force is applied to the engagement pin 7a by the increased tension T1, the moving lever 71 moves in the upward direction b, and the engagement pin 7b also moves in the upward direction b. When the two engaging pins 7b move in the upward direction b, the lower engaging pin 7b presses and bends the optical fiber 3 upward, and a bending change portion C is generated. The spring 62 contracts so as to balance the tension T1 and the repulsive force of the optical fiber 3. When the wire W is cut or disconnected and the tension T of the wire W decreases, the moving lever 71 moves downward by the biasing force of the spring 62, and the upper engaging pin 7 b moves the optical fiber 3. Since it is pressed downward and bent, the abnormal state of the wire W is detected.

(Other variations of detectors)
8 and 9 show still another modification of the detector 5. As shown in FIG. 8, the detector 5 further includes a fixing portion 56 for connecting and fixing the other end B of the wire W inside the detector housing 50. The detector housing 50 is terminated by introducing one end A and the other end B of the wire W into the inside. The one end A and the other end B are usually different end portions of the two wires W, but can also be both ends of the one wire W. The fixing portion 56 may be configured to fix the wire W by sandwiching the wire W between the washer and one surface of the detector housing 50 using a bolt and a presser washer, and to be fixed at a plurality of places to prevent the locking. it can. The fixing portion 56 may be configured to terminate via a spring that applies tension to the wire W.

  As shown in FIG. 9, when a plurality of sets of detectors 5 and wires W are arranged in series with each other, each detector 5 terminates one end A of the wire W to be detected by its own displacement mechanism 2, The other end B of the wire W to be detected by the displacement mechanism 2 of the other detectors 5 adjacent to each other is terminated. According to this detector 5, the number of parts can be reduced by combining the detection part (displacement mechanism 2) and the fixing part 56, construction and parts management are easy, and manufacturing costs can be reduced. . In the figure, a disconnection detecting optical fiber cable 32 is shown. The optical fiber cable 32 is stretched over the entire surface of the wire mesh 12, and is optically connected to the trunk optical fiber cable 31 in the optical termination box 3a, and is connected to a light amount detector 4 (not shown). The optical fiber cable 32 determines whether or not the cable is cut depending on whether or not the transmitted light is received by the light receiving unit 42 (FIG. 3).

  FIGS. 10A and 10B show still another modification of the detector 5. The detector 5 includes two sets of displacement mechanisms 2 and an operation limiting mechanism 8 that limits the bending of the optical fiber 3 with respect to the amount of deflection when the tension T acting on the wire W is a predetermined value or less. . The wire W is introduced and led out through the openings 5a on the left and right side walls of the detector housing 50 in a straight line state to which a predetermined tension T is applied. A bonding member 22 of each displacement mechanism 2 is fixed to the wire W. The optical fiber 3 has a plurality of guide pins 53 and 56 that are fixed to the detector housing 50, with a middle portion of the optical fiber 3 drawn into the housing from an opening 5b provided in the lower wall of the detector housing 50. The two press pulleys 23 are in contact with each other and are fixed inside the housing in a state where a predetermined tension is applied.

  The operation limiting mechanism 8 includes a moving element 81 fixed to the wire W, an arm member 82 protruding from the moving element 81, and two springs 83 (buffer members) disposed on both sides of the arm member 82. . The mover 81 moves together with the wire W. One end of the spring 83 is fixed to the detector housing 50 and the other end is fixed to the arm member 82, and the movement of the arm member 82 and the moving element 81, and hence the movement of the wire W, is restricted by the elastic force. For example, when the tension T increases to the tension (T + ΔT), the operating characteristic of the spring 83 is set so that the wire W does not move or moves only slightly when the increase amount ΔT is equal to or less than a predetermined value. The detector 5 is provided with such an operation limiting mechanism 8, thereby limiting the operation of the displacement mechanism 2 with respect to the amount of deflection when the tension T acting on the wire W is equal to or less than a predetermined value. Bending can be limited.

  According to the optical sensor system 1 provided with this detector 5, in the case of a small-scale deflection caused by an animal such as a bird riding on the wire W instead of a deflection based on an external force by a suspicious person, an insensitive region for this Thus, false alarms can be reduced. This detector 5 has a bilaterally symmetric configuration, and when the wire W moves left or right, it is possible to detect the deflection that caused the movement. Further, even when the wire W is cut or removed, this can be detected. In addition, in order for the wire W to move in the wire material direction a, the existence of a movement allowance is necessary, and the movement allowance can be set by the spring 6 or the like. Further, the detector 5 does not necessarily have to be configured symmetrically. For example, the displacement mechanism 2 may be only on one side, or the spring 83 may be only on one side.

(Other examples of optical sensor systems)
FIGS. 11A and 11B show configuration examples of the optical fiber 3 and the light amount detection unit 4 in the optical sensor system 1. In the system shown in FIG. 11A, the optical fiber 3 includes an attenuator ATT that adjusts the amount of transmitted light outside the light amount detection unit 4. The attenuator ATT can be inserted in a plurality of stages in the optical line by a socket plug method, for example, and the light receiving power can be adjusted. However, such an attenuator ATT can usually attenuate optical power only in a stepwise manner.

  In the system shown in FIG. 11B, a variable attenuator 43 that adjusts the amount of light transmitted through the optical fiber 3 is provided inside the light amount detector 4. As the variable attenuator 43, for example, a waveguide type variable optical attenuator using a thermo-optic effect can be used. By providing such a variable attenuator 43 in the light transmitter 41 or the light receiver 42, the light receiving power can be adjusted linearly. Therefore, the light amount can be easily adjusted, and the construction of the optical sensor system 1 can be facilitated. In the optical sensor system 1, the relationship table between the tension T of the wire W and the deflection amount, the relationship table between the deflection amount and the amount of change in transmitted light amount, and the like can be referred to by the light receiving unit 42 of the light amount detection unit 4, for example. By preparing for, the variable attenuator 43 can be used effectively. For example, it is possible to automatically refer to these tables, adjust the received light power by the variable attenuator 43, and appropriately determine the occurrence of deflection due to suspicious person intrusion without being influenced by the adjustment.

  The present invention is not limited to the above-described configuration, and various modifications are possible, and the above-described embodiments and modifications may be combined with each other. For example, a suspicious person detection system can be constructed by mixing the optical sensor system 1 including the various detectors 5 described above. Moreover, although it demonstrated that the optical fiber 3 was introduce | transduced in parallel with respect to each detector 5, the common optical fiber 3, ie, the detector 5, is connected in series with the optical fiber 3 with respect to the some detector 5. FIG. It can also be connected. In this case, the total extension distance of the optical fiber 3 to be used can be shortened, and the construction becomes easy. In addition, the detection of the deflection is only known that the detector 5 associated with one optical fiber 3 has detected, and it is not clear which detector 5 is, but there are situations where this is practical. To do. In the case of this series connection, the light quantity detector 4 is further provided with an OTDR circuit (Optical Time-Domain Reflectometer) and the like, and the detector 5 that has detected the bending is identified by using transmitted light or reflected light of an optical pulse. Can do. In this case, since the specified place is the detector 5 that is locally arranged along the optical fiber 3 at a known interval, a low-accuracy OTDR circuit or a similar circuit can be used. Further, although terms such as up and down, left and right are used for convenience of explanation, the present optical sensor system can be used regardless of the posture. Further, the spring or the like may be any spring that can apply tension to the wire W or the like, and in addition to a leaf spring and a coil spring, a rubber, an air spring, or the like can be used. Further, the optical fiber 3 may have a configuration in which the microbending effect is enhanced by providing irregularities on the surface thereof, for example. Further, the guide pin or the like that supports the optical fiber 3 in the detector housing 50 may have a pulley structure or a roller structure.

DESCRIPTION OF SYMBOLS 1 Optical sensor system 2 Displacement mechanism 21 Rotating lever 3 Optical fiber 4 Light quantity detection part 43 Variable attenuator 5 Detector 50 Detector housing | casing 6 Spring 61, 62 Spring 7 Displacement mechanism 71 Moving lever 83 Spring (buffer member)
A One end of the wire B The other end of the wire T, T1 Tension W Wire

Claims (9)

An optical sensor system for detecting the intrusion of a suspicious person,
A displacement mechanism that is displaced according to the amount of deflection of the wire disposed in the area for detecting intrusion;
An optical fiber disposed such that the degree of bending changes in conjunction with the operation of the displacement mechanism;
An optical sensor system comprising: a light amount detection unit that detects a change in the amount of light transmitted through the optical fiber.   The optical sensor system according to claim 1, further comprising a spring that applies tension to the wire.   The optical sensor system according to claim 1, wherein the displacement mechanism includes a rotation lever that rotates by bending of the wire, and the optical fiber is bent by the rotation of the rotation lever.   The optical sensor system according to claim 3, wherein the rotation axis position of the rotation lever is variable.   The said displacement mechanism is provided with the movement lever which moves to the direction with respect to the said wire according to the bending of the said wire, The said optical fiber is bent by the movement of the said movement lever, The Claim 1 or Claim 2 characterized by the above-mentioned. Optical sensor system. A detector housing that houses the displacement mechanism and one end of the wire;
The detector housing connects and fixes the other end of the wire to be detected by the displacement mechanism in another detector housing adjacent to each other when a plurality of pairs of the displacement mechanism and the wire are arranged in series. An optical sensor system according to any one of claims 1 to 5, further comprising a fixing portion for the purpose.   The optical sensor system according to any one of claims 1 to 6, wherein a relation table between the tension of the wire and the amount of deflection can be referred to.   8. The displacement mechanism according to claim 1, further comprising a buffer member that limits bending of the optical fiber with respect to a deflection amount when a tension acting on the wire is equal to or less than a predetermined value. The optical sensor system according to claim 1.   The optical sensor system according to claim 1, wherein the light amount detection unit includes a variable attenuator that adjusts a transmitted light amount of the optical fiber.

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