JP2006258463A - External force detection system and security system using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an external force detection system which can perform detection at a plurality of points without complicating its wiring and lengthen the wiring and to provide a security system using it. <P>SOLUTION: The external force detection system 1 comprises a multi-point detection system 10 having a plurality of optical sensors S which are provided in a transmission optical fiber 12 which transmits measuring light from a light source 51 in series and discretely and provide the measuring light with different amounts of optical loss by the action of an external force, and an arithmetic processing unit 55 which determines an optical sensor S on which the external force has acted on the basis of the difference in intensity between output light and the measuring light emitted from the multi-point detection system 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an external force detection device that detects the presence or absence of an external force at multiple points, and a crime prevention system using the external force detection device.

Conventionally, as a device for detecting the opening and closing of doors and windows for the purpose of crime prevention etc., sensors such as reed switches and microswitches are built in the door frame, etc., and the sensors operate when the door is opened. There is known a door detection device that detects that the door has been opened (see Patent Document 1).
JP 56-36792 A

However, a conventional device that detects the open / closed state of a door or window using a sensor such as a reed switch or a micro switch requires wiring for each sensor. For this reason, when a large number of detections are performed for one door or the like, or when a large number of doors are detected at a time, the number of wirings is increased. Therefore, when applied to an apartment house such as a condominium, there is a problem that wiring becomes very complicated. In addition, there is a problem that the length of the wiring is limited due to the influence of the voltage drop.
For this reason, it is conceivable to use a wireless sensor that does not require wiring, but there is a problem that the transmission distance is finite, the cost is higher than that of wired communication, and stability and reliability are inferior.

  The present invention has been made in view of the above-described circumstances, and it is an object of the present invention to provide an external force detection device that enables detection at a plurality of locations without incurring complexity of the wiring and can increase the distance of the wiring. And Moreover, it aims at providing the crime prevention system using such an external force detection apparatus.

In the external force detection device and the crime prevention system using the same according to the present invention, the following means are adopted in order to solve the above problems.
In the first invention, the external force detection device is provided in series and discretely with a transmission optical fiber that transmits the measurement light from the light source, and a plurality of different optical loss amounts are given to the measurement light by the action of the external force. And an arithmetic processing unit for obtaining an optical sensor to which an external force is applied based on a difference in intensity between output light emitted from the multipoint detection unit and measurement light.
According to the present invention, the multipoint detection unit in which a plurality of external force detection optical sensors are provided in series and discretely on one transmission optical fiber is provided, so that it is not necessary to lay wiring for each optical sensor. Further, since the transmission optical fiber is used, it is possible to avoid the occurrence of problems due to the long wiring distance. Furthermore, since the amount of light loss with respect to the measurement light in each optical sensor is set differently, the difference between the intensity of the output light emitted from the multipoint detection unit and the intensity of the measurement light incident on the multipoint detection unit It becomes possible to determine to which optical sensor an external force has been applied.

  In addition, one end of the transmission optical fiber is connected to a first optical branching device that inputs measurement light into the transmission optical fiber and emits output light to the arithmetic processing unit, and the other end of the transmission optical fiber is connected to the measurement optical fiber. In the case where the total reflection part for reflecting light is provided, it is not necessary to lay the transmission optical fiber in a loop shape, so that further complication of wiring can be avoided.

In addition, the external force detection device is provided in series and discretely with the transmission optical fiber that transmits the measurement light from the light source, and includes a plurality of optical sensors that give different amounts of light loss to the measurement light by the action of the external force. A plurality of multipoint detectors, a plurality of multipoint detectors connected to each other, a second optical branching device for allowing measurement light to enter one of the plurality of multipoint detectors, and a plurality of multipoint detectors And an arithmetic processing unit for obtaining an optical sensor to which an external force is applied based on the difference in intensity between the output light emitted from any of the above and the measurement light.
According to the present invention, it is possible to greatly increase the number of external force detection points. In addition, it is possible to detect external force at a plurality of locations substantially simultaneously.

  In addition, when the second optical branching device switches the multi-point detection unit that makes the measurement light incident every predetermined time, the processing of the arithmetic processing unit for each multi-point detection unit is sequentially switched, thus reducing the burden on the arithmetic processing unit. can do. As a result, a significant increase in the detection points of external force can be realized.

  Further, the amount of light loss in the plurality of optical sensors is set as shown in the following formula (1).

  As a result, when an external force is applied to one or more optical sensors, it is possible to easily identify the optical sensor to which the external force has been applied from the amount of light loss of the obtained output light.

The second invention is a crime prevention system, wherein the crime prevention system includes an opening / closing detection unit that detects an opening / closing state of an opening / closing unit of a building, and an alarm unit that performs a predetermined alarm based on information from the opening / closing detection unit. As the open / close detection unit, the external force detection device of the first invention is used.
According to the present invention, it is possible to facilitate the laying of the wiring of the opening / closing detection unit when the crime prevention system for detecting the opening / closing states of the opening / closing units existing in a building and detecting a predetermined alarm is constructed. Therefore, the construction time of the crime prevention system can be greatly shortened.

According to the present invention, the following effects can be obtained.
According to the first invention, since it is not necessary to lay the wiring for each sensor, the wiring is prevented from becoming complicated. In addition, since the optical loss amount for the measurement light in each optical sensor is set to be different, it becomes possible to easily detect which external force has acted on the optical sensor from the optical loss amount of the received output light. .
Further, according to the second invention, when the security system is constructed, the wiring of the open / close detection unit is easily laid, so that the construction time of the security system can be greatly shortened. Therefore, it is possible to reduce the cost of the security system. In addition, a large-scale crime prevention system can be easily constructed.

Hereinafter, a first embodiment of an external force detection device and a security system using the same according to the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram showing a configuration of an external force detection device 1 according to the first embodiment of the present invention.
The external force detection device 1 includes a multipoint detection unit 10 and a device main body 50.

  The multipoint detection unit 10 is installed at a place where an external force to be detected is generated, and includes a transmission optical fiber 12, a total reflection end 14 provided at the tip of the transmission optical fiber 12, and a transmission It comprises a plurality of optical sensors S (S1 to Sn) arranged in series and discretely with respect to the optical fiber 12.

The transmission optical fiber 12 is made of high-purity quartz glass or plastic, and one end thereof is connected to the apparatus main body 50. Since the transmission optical fiber 12 has a very small transmission loss, the distance between the apparatus main body 50 and the total reflection end 14 can be sufficiently extended. For example, it is possible to extend the length to about 1 km.
The total reflection end 14 is a reflecting mirror that totally reflects light, totally reflects measurement light transmitted through the transmission optical fiber 12, and emits it toward the apparatus main body 50.
Therefore, when the measurement light is incident from one end connected to the apparatus main body 50, the multipoint detection unit 10 sequentially transmits the measurement light to the plurality of optical sensors S via the transmission optical fiber 12. On the other hand, the measurement light reflected at the total reflection end 14 provided at the tip of the multipoint detection unit 10 (tip of the transmission optical fiber 12) is also sequentially transmitted and emitted as output light toward the apparatus main body 50. To do.

The optical sensor S (S1 to Sn) gives a loss to the measurement light (including the measurement light reflected at the total reflection end 14) passing through the inside by the action (distortion, bending) of an external force, For example, a micro bending sensor, a hetero core sensor having a hetero structure in the core, or an FBG (Fiber Bragg Grating) is used. That is, the optical sensor S is set so that the measurement light incident from the transmission optical fiber 12 is lost by the action of an external force and is emitted toward the total reflection end 14 and the apparatus main body 50.
In addition, each of the optical sensors S1 to Sn is set so that the amount of loss of measurement light (loss amount) due to the action of an external force is different. Specifically, the light loss amount (Li) with respect to the measurement light due to the action of external force in each of the optical sensors S1 to Sn is set discretely as shown in Expression (1).

The reason why the amount of light loss with respect to the measurement light due to the action of the external force in each of the optical sensors S1 to Sn is set as shown in Equation (1) is to make it possible to easily identify the light sensor S to which the external force has acted. That is, since the multipoint detection unit 10 includes a plurality of optical sensors S, an output obtained as an output of the multipoint detection unit 10 when an external force simultaneously acts on some of the plurality of optical sensors S. The light has an intensity lost by the total amount of light loss set in the optical sensor S to which an external force is applied. At this time, for example, if the sum of the optical loss amounts of the measurement light from the two optical sensors S1 and S2 is substantially the same as the optical loss amount of the measurement light from the other optical sensors S3, any of the optical sensors S1 to S3. It becomes impossible to determine whether an external force has been applied.
Therefore, each of the optical loss amounts by the plurality of optical sensors S is not substantially the same as the optical loss amount by the other optical sensors S (or the sum of the optical loss amounts by the other optical sensors S). It is necessary to set the optical loss amounts of the optical sensors S1 to Sn discretely as shown in the equation (1). In other words, by setting the optical loss amount of each of the optical sensors S1 to Sn discretely as shown in the equation (1), an external force is applied from the optical loss amount of the output light obtained as an output. A plurality of optical sensors S can be uniquely identified.

  The apparatus body 50 receives measurement light to the multipoint detection unit 10 and receives output light from the multipoint detection unit 10 to identify the photosensor S that has received external force, The light source 51, the light source control unit 52, the isolator 53, the optical coupler 54, and the arithmetic processing unit 55 are configured.

The light source 51 is, for example, a laser diode (LD), emits measurement light having a predetermined wavelength under the control of the light source control unit 52, and emits the measurement light to the isolator 53.
The isolator 53 is an element that transmits the measurement light emitted from the light source 51 only in one direction, and protects the light source 51 by blocking light from the optical coupler 54 connected to the output end of the isolator 53. Used.
The optical coupler 54 is a device having a function of branching incident light. In addition to the isolator 53, the transmission optical fiber 12 and the arithmetic processing unit 55 of the multipoint detection unit 10 are connected. The optical coupler 54 emits the measurement light incident from the isolator 53 toward the transmission optical fiber 12, while calculating the output light incident from the transmission optical fiber 12 (multi-point detection unit 10). The light is emitted toward the processing unit 55.

The arithmetic processing unit 55 identifies one or more optical sensors S to which an external force is applied based on the output light incident from the optical coupler 54, and includes a light receiver 56 and a signal processing unit 57. The
The light receiver 56 receives the output light incident from the optical coupler 54 and outputs a voltage signal (light reception signal) corresponding to the light intensity of the output light by the photoelectric effect. As the light receiver 56, specifically, a photodiode is used. Then, the light reception signal of the output light converted into the voltage signal in the light receiver 56 is output to the signal processing unit 57.
The signal processing unit 57 obtains the light loss amount of the output light based on the light reception signal from the signal processing unit 57, and further, from the obtained light loss amount, among the plurality of optical sensors S in the multipoint detection unit 10. One or a plurality of optical sensors S to which an external force is applied are specified. And the calculation data by the signal processing part 57 are output outside. A method for detecting one or more optical sensors S to which an external force is applied from the amount of light loss of output light will be described later.

Next, the operation of the external force detection device 1 configured as described above will be described.
First, the measurement light from the light source 51 is emitted to the transmission optical fiber 12 via the isolator 53 and the optical coupler 54. Then, the measurement light incident on the transmission optical fiber 12 is sequentially incident on a plurality of optical sensors S <b> 1 to Sn arranged in series and discretely on the transmission optical fiber 12. Furthermore, after total reflection at the total reflection end 14, the light again enters the optical coupler 54 as output light via the plurality of optical sensors S <b> 1 to Sn disposed in the transmission optical fiber 12.

Here, when an external force is applied to one of the optical sensors S arranged in series and discretely on the transmission optical fiber 12, the amount of light loss set in the optical sensor S is transmitted through the multipoint detection unit 10. Given to light. That is, when an external force is simultaneously applied to a plurality of optical sensors S, the amount of light loss set in the optical sensor S to which the external force is applied is sequentially given to the measurement light. Finally, the sum of the light loss amounts of the plurality of optical sensors S to which the external force is applied is given to the measurement light and attenuated. The light attenuated in this way enters the optical coupler 54 as output light from one end of the transmission optical fiber 12.
The output light incident on the optical coupler 54 is transmitted from the optical coupler 54 to the light receiver 56, converted into a voltage signal, and sent to the signal processing unit 57. In the signal processing unit 57, the intensity of the output light is obtained from the voltage signal from the light receiver 56, and the intensity of the obtained output light is compared with the intensity of the measurement light emitted toward the multipoint detection unit 10. Thus, the amount of light loss received when passing through the multipoint detector 10 is obtained.

As described above, the light loss amount of the output light detected by the signal processing unit 57 is the sum of the light loss amounts in one or more photosensors S to which an external force is applied.
However, since the amount of light loss in each optical sensor S is discretely set as shown in Expression (1), one or more optical sensors S to which an external force is easily applied are easily processed by the signal processing unit 57. It can be uniquely identified. That is, the amount of light loss in each of the optical sensors S1 to Sn was set discretely as shown in the equation (1), so that even when an external force was applied to a plurality of optical sensors S at the same time, it was obtained. A combination of the optical sensors S to which an external force has been applied is uniquely determined from the amount of light loss of the output light, whereby one or more optical sensors S to which an external force has been applied can be specified.
In this manner, one or more optical sensors S to which an external force is applied can be identified from the amount of light loss of the output light obtained from the multipoint detection unit 10. And the signal processing part 57 outputs the information regarding the specified optical sensor S to the outside as calculation data.

As described above, even when a plurality of optical sensors S are provided in one transmission optical fiber 12, the amount of light loss in each optical sensor S is discretely expressed as shown in Expression (1). By setting, it is possible to reliably identify one or more optical sensors S to which an external force has acted. Since one or a plurality of optical sensors S to which an external force is applied can be easily identified, it is not necessary to prepare a special arithmetic device or the like, and an increase in device cost can be suppressed.
In the external force detection device 1, even when the transmission optical fiber 12 is disconnected or disconnected in the middle, the Fresnel reflection at the disconnected or disconnected part is used to be closer to the light source 51 than the disconnected part. In the optical sensor S, the external force can be continuously detected.

Next, a second embodiment of the external force detection device of the present invention will be described with reference to the drawings.
FIG. 2 is a schematic diagram showing the configuration of the external force detection device 2 according to the second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same apparatus, member, etc. as the external force detection apparatus 1 which concerns on 1st Embodiment, and the description is abbreviate | omitted.
The external force detection device 2 has a plurality of multipoint detection units 10 connected to the device main body 60.
The apparatus main body 60 includes a multi-branch optical coupler 58 in addition to the light source 51, the light source control unit 52, the isolator 53, the optical coupler 54, and the arithmetic processing unit 55 (the light receiver 56 and the signal processing unit 57).

The multi-branch optical coupler 58 functions as an optical branching unit, and is connected to the optical coupler 54, the arithmetic processing unit 55, and a plurality of multi-point detection units 10 (transmission optical fiber 12).
The multi-branch optical coupler 58 emits the measurement light incident from the optical coupler 54 toward one of the plurality of transmission optical fibers 12, while the output light incident from the transmission optical fiber 12. Are emitted toward the arithmetic processing unit 55.
Further, the branching of the measurement light in the multi-branch optical coupler 58 can be performed in several μsec. As a result, even when a plurality of multipoint detection units 10 are connected to the apparatus main body 60, the load on the arithmetic processing unit 55 can be reduced by sequentially switching the plurality of multipoint detection units 10 by time division processing. Without increasing, it is possible to detect external force at multiple points.
Moreover, the optical loss amount with respect to the measurement light of each of the optical sensors S11 to Smn in the plurality of multipoint detection units 10 is discretely set as shown in Expression (1), as in the first embodiment.

Since such an external force detection device 2 includes a plurality of multipoint detection units 10, it is possible to detect external forces at these multiple locations by installing the multipoint detection units 10 (photosensors S) at a plurality of locations. In particular, since the length of each multipoint detector 10 (the length of the transmission optical fiber 12) can be set arbitrarily, it is possible to detect an external force at a plurality of spaced locations.
Further, as shown in the equation (1), the amount of light loss with respect to the measurement light in the plurality of optical sensors S is set discretely, and the plurality of multipoint detection units 10 are switched and used by time division processing. Therefore, an increase in the burden on the arithmetic processing unit 55 can be avoided. Therefore, it is possible to increase the number of measurement points while suppressing an increase in apparatus cost.

Next, a crime prevention system in which such external force detection devices 1 and 2 are installed on a door portion or a window portion of a building will be described.
Since the above-described external force detection devices 1 and 2 include a plurality of optical sensors S that detect external forces, by installing the optical sensors S near, for example, a hinge of the door portion, the door portion is opened or closed. Can be grasped. That is, when the door is open, almost no external force acts on the optical sensor S installed near the hinge or the like. On the other hand, when the door is closed, the external force acts on the optical sensor S. By determining whether or not it is acting on S, it is possible to grasp the open / closed state of the door portion.
The installation location of the optical sensor S is not limited to the vicinity of the hinge, but may be a door frame. When the door comes into contact with the door frame portion, an external force acts on the optical sensor S provided on the door frame portion. Therefore, the open / closed state of the door portion can be grasped by detecting the external force.
In addition, although it is possible to grasp the open / closed state of the door portion by arranging one photosensor S, in order to improve the reliability of the door open / close determination, a plurality of photosensors S are connected to the door. It is preferable to provide in the part.
Further, in the case of a sliding window portion or the like, by providing the window frame with the optical sensor S, it is possible to grasp the open / closed state of the window portion. Like the door part, it is preferable to provide a plurality of optical sensors S.

And, when the external force detection devices 1 and 2 are applied to a crime prevention system installed in a door or window of a building, a plurality of optical sensors S are installed in one transmission optical fiber 12, Its laying is easy. That is, it is not necessary to wire cables for each sensor that detects external force.
Further, since it is not necessary to embed switches or the like in the door frame or window frame, the laying work can be facilitated. Similarly, replacement work at the time of maintenance or the like is facilitated.
Furthermore, it becomes easy to retrofit the security system to the door or window of the building.

  In the crime prevention system described above, when the door or window is opened when the resident is out, that is, when a suspicious person enters, the open / closed state of the door or window is detected by the external force detection devices 1 and 2. Since it is detected, this detection information can be output to an alarm device, for example, an emergency bell can be operated, or a security guard (security company) can be contacted. In this way, it is possible to prevent theft and the like.

The above-described embodiment is an example, and various modifications can be made based on design requirements and the like without departing from the gist of the present invention.
For example, in the above-described embodiment, the configuration in which the total reflection end 14 is provided at one end of the transmission optical fiber 12 to reflect the measurement light and enter the apparatus main bodies 50 and 60 has been described. Absent.
For example, as illustrated in FIG. 3, one transmission optical fiber 12 may have one end connected to the light source 51 side and the other end connected to the arithmetic processing unit 55 side.

  Moreover, although the case where the external force detection devices 1 and 2 are applied to a crime prevention system that detects opening and closing of door portions, window portions, etc. has been described, for example, a rain gauge, a flood level meter, or a push button type emergency call device on a highway It is also possible to apply to the above.

It is a mimetic diagram showing the composition of external force detection device 1 concerning a first embodiment of the present invention. It is a schematic diagram which shows the structure of the external force detection apparatus 2 which concerns on 2nd embodiment of this invention. It is a schematic diagram which shows the modification (external force detection apparatus 1 ') of the external force detection apparatus 1 which concerns on 1st embodiment of this invention.

Explanation of symbols

S (S1-Sn, S11-Smn) ... Optical sensor 1, 1 ', 2 ... External force detector 10 ... Multi-point detector 12 ... Optical fiber for transmission 14 ... Total reflection end (total reflection unit)
51 ... Light source 54 ... Optical coupler (second optical splitter)
55 ... arithmetic processing unit 58 ... multi-branch coupler (second optical branching unit)

Claims (6)

A multipoint detector having a plurality of optical sensors that are provided in series and discretely in a transmission optical fiber that transmits measurement light from a light source, and that gives different amounts of light loss to the measurement light by the action of external force; ,
An arithmetic processing unit for obtaining an optical sensor to which an external force is applied based on an intensity difference between output light emitted from the multipoint detection unit and the measurement light;
An external force detection device comprising: One end of the transmission optical fiber is connected to a first optical branching unit that enters the measurement light into the transmission optical fiber and emits the output light to the arithmetic processing unit,
The other end of the transmission optical fiber is provided with a total reflection portion that reflects the measurement light.
The external force detection device according to claim 1. A plurality of multi-point detections having a plurality of optical sensors that are provided in series and discretely in a transmission optical fiber that transmits measurement light from a light source and that give different amounts of light loss to the measurement light by the action of external force. And
A plurality of multi-point detectors connected to each other, and a second optical branching unit that causes the measurement light to enter one of the plurality of multi-point detectors;
An arithmetic processing unit for obtaining an optical sensor to which an external force is applied based on an intensity difference between output light emitted from any of the plurality of multipoint detection units and the measurement light;
An external force detection device comprising:   The external force detection device according to claim 3, wherein the second optical branching unit switches the multipoint detection unit that makes the measurement light incident at predetermined time intervals. 5. The external force detection device according to claim 1, wherein the amount of light loss in the plurality of optical sensors is set as represented by the following expression (1).

In a crime prevention system comprising an open / close detection unit that detects an open / close state of an open / close unit of a building, and an alarm unit that performs a predetermined alarm based on information from the open / close detection unit,
A crime prevention system using the external force detection device according to any one of claims 1 to 5 as the open / close detection unit.

Images