JP2006284370A - Sensor device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sensor device detecting passers-by on the track of a railroad or fallen passengers or fallen objects from a passing traffic vehicles and from the platform of a railroad station and outputting an alarm. <P>SOLUTION: This is an obstruction detecting sensor device detecting obstruction on the track for railroad vehicles, which is equipped with a sheet-like optical fiber sensors 1, deployed at an installation surface of specified positions pinching the track, varying transmitted volume respondent to pressing force posed from above, a photo-receiving/detecting section 4 detecting variation of the transmitted volume transmitted through the optical fiber sensors 1, and an alarm outputting section 5 discriminating objects (human and small animals and the like) forcing to press the optical fiber sensors 1 based on variation of transmitted volume detected by the photo-receiving/detecting section 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an obstacle detection sensor device that detects an obstacle on a track of a railway, and in particular, monitors the presence of an obstacle in a railroad crossing and an obstacle that has fallen on a railway from a platform in a railway station. The present invention relates to a sensor device.

  Conventionally, an accident on a track on which a railroad vehicle passes, for example, within a railroad crossing where the railroad rail crosses a general road, a traffic vehicle such as a passerby or a bicycle or a car is closed by a breaker, Being stuck in the cause of a serious accident. In addition, if a passenger or baggage is dropped on a track from a platform in a railway station, it will be an obstacle to an operating vehicle that happens to occur. Passengers within these railroad crossings, traffic vehicles such as bicycles and cars, or passengers who fall on the platform or fallen objects can be detected quickly, and obstacles can be eliminated, or accidental travel vehicles can be reported and operated. In order to prevent contact accidents with railway vehicles, such as by stopping the vehicle.

  In order to deal with the above-mentioned accidents, it is most common to detect an obstacle such as a passerby in a railroad railroad crossing or a passing vehicle using an infrared sensor (for example, a patent) Reference 1).

  Further, as an optical method similar to an infrared sensor, a television camera (see, for example, Patent Document 2), an azimuth and distance sensor using a laser (for example, see Patent Document 3), and the like have been proposed.

On the other hand, a method using a piezoelectric sensor (for example, refer to Patent Document 4) or a method for detecting gas pressure fluctuations of a hose (for example, Patent Document 5) for passengers who fall from a station platform or fallen objects. is there.
Japanese Patent Application No. 05-241829 Japanese Patent Application No. 09-148177 Japanese Patent Application No. 2001-199778 Japanese Patent Application Laid-Open No. 07-329772 Japanese Patent Laid-Open No. 200-95100

  However, the above-described infrared sensor has a drawback in that a blind spot is generated in a space formed by a projector and a light receiver. It is not practical to increase the number of facilities in order to reduce this blind spot because the facilities and construction costs increase.

  In addition, the above-described piezoelectric sensor requires a signal converter and transmission equipment in order to transmit signals for each unit sensor to the management department, and maintenance and inspection thereof are also required. There is a difficulty of becoming larger.

  In addition, it is difficult to transmit the sensed signal over a long distance and concentrate monitoring and control at a remote place in terms of equipment and construction cost, whether it is the infrared sensor or the piezoelectric sensor described above.

  Accordingly, an object of the sensor device of the present invention is to provide an obstacle detection sensor device for detecting an obstacle on a track of a railroad railway vehicle, in particular, a passerby or a passing vehicle in a railroad railroad crossing, and a platform of a railway station. The present invention provides a sensor device that quickly and accurately monitors the presence or absence of a passenger or an object that has fallen from the vehicle, and has a lower construction cost, facility cost, and operation cost than conventional methods.

In order to achieve the above object, the sensor device according to claim 1 is a sensor device for detecting an obstacle on a track of a railroad, and is laid on the entire surface of the railroad crossing of the railroad and added from above. A sheet-like light transmission unit that varies the amount of light transmission according to the pressing force, a light transmission amount change detection unit that detects a change in the amount of light transmission through the light transmission unit, and the light transmission amount change detection An object identifying means for identifying an object obtained by applying a pressing force to the light transmission means based on a change in the amount of transmitted light detected by the means.
According to the first aspect, since the sheet-like light transmission means is laid on the entire surface around the track in the railroad crossing, the light transmission amount change detection means and the object identification means are provided. It can be detected without leaking the presence or absence of obstacles such as passersby or traffic vehicles. In addition, it is possible to classify that the falling object is a specific object and output an alarm.

The sensor device according to claim 2, wherein the light transmission means is disposed on an optical medium that transmits the light and changes a transmission amount of the light according to a pressing force, and around or above and below the optical medium, And a protective sheet for protecting the optical medium.
According to the second aspect, by providing the protective sheet around or on the upper and lower surfaces of the optical medium constituting the optical transmission means, the optical transmission means has strength and detection performance that can withstand long-term use. It is possible to classify obstacles such as passers-by or traffic vehicles in railroad railroad crossings and detect them without leaking.

The sensor device according to claim 3 is characterized in that the optical transmission means displays advertisement information on an upper surface thereof.
According to claim 3, the appearance of the appearance is good and colorful by displaying advertisement information such as information on public facilities or special events, pictures / coloring to improve the beautification of the environment, advertisement / advertisement on the upper surface of the protective sheet. Is a good level crossing.

According to a fourth aspect of the present invention, there is provided a sensor device comprising an alarm generating means for generating an alarm according to the type of the obstacle identified by the object identifying means.
According to the fourth aspect, it is possible to classify that the fallen object detected within the railroad crossing of the track railway is a specific one and output an alarm.

The sensor device according to claim 5, wherein the object identification unit includes a threshold setting unit in which a threshold according to the type of the obstacle is set, a light transmission amount detected by the light transmission amount change detection unit, and the threshold value. And an object determining unit for identifying an object obtained by applying a pressing force to the optical transmission unit based on a threshold set by a setting unit.
The sensor device according to claim 6 is characterized in that the threshold value setting means has a first threshold value for determining the obstacle and a second threshold value for determining the type of the obstacle.
According to the fifth to sixth aspects, it is possible to accurately classify that the fallen object detected within the railroad crossing is a specific one.

The sensor device according to claim 7 is connected to an existing optical communication network and includes an optical transmission path for transmitting light between the optical transmission unit and the light transmission amount change detection unit.
According to the seventh aspect of the present invention, detection can be performed without leaking the presence or absence of an obstacle such as a passerby or a traffic vehicle in a railroad crossing integrated with an existing information system.

The sensor device according to claim 8 is a sensor device for detecting an obstacle on a track of a railway, and is laid along a track of a platform in a boarding / alighting facility of the railway, in accordance with a pressing force applied from above. Detected by the sheet-like light transmission means for varying the light transmission amount, the light transmission amount change detection means for detecting a change in the light transmission amount transmitted through the light transmission means, and the light transmission amount change detection means. Further, an object identification unit for identifying an object obtained by applying a pressing force to the light transmission unit based on a change in the amount of transmitted light is provided.
According to claim 8, since the sheet-like light transmission means is laid around the track along the track in the boarding / exiting station, the station is provided with the light transmission amount change detection means and the object identification means. Detection is possible without leaking passengers on the premises or obstacles such as falling objects. In addition, it is possible to classify that the falling object is a specific object and output an alarm.

The sensor device according to claim 9, wherein the light transmission unit is disposed on an optical medium that transmits the light and changes a transmission amount of the light according to a pressing force, and around or above and below the optical medium, And a protective sheet for protecting the optical medium.
According to the ninth aspect, by providing the protective sheet around or on the upper and lower surfaces of the optical medium constituting the optical transmission means, the optical transmission means has strength and detection performance that can withstand long-term use. It is possible to classify obstacles such as passers-by or traffic vehicles in railroad railroad crossings and detect them without leaking.

The sensor device according to claim 10 is characterized in that the optical transmission means displays advertisement information on an upper surface thereof.
According to claim 10, a dark image platform is displayed on the upper surface side of the protective sheet by displaying screen information such as information on public facilities or events, design / coloring for improving the beautification of the environment, or advertisement / advertisement. Colorful and good looking.

The sensor device according to an eleventh aspect includes an alarm generation unit that generates an alarm according to the type of the obstacle identified by the object identification unit.
According to the eleventh aspect, it is possible to classify that the fallen object detected in the railroad station boarding / exiting station premises is a specific one and output an alarm.

The sensor device according to claim 12, wherein the object identification unit includes a threshold setting unit in which a threshold is set according to the type of the obstacle, a light transmission amount detected by the light transmission amount change detection unit, and the threshold value. And an object determining unit for identifying an object obtained by applying a pressing force to the optical transmission unit based on a threshold set by a setting unit.
The sensor device according to claim 13 is characterized in that the threshold value setting means has a first threshold value for determining the obstacle and a second threshold value for determining the type of the obstacle.
According to the twelfth to thirteenth aspects, it is possible to accurately classify that the fallen object detected in the railroad crossing is a specific one.

The sensor device according to claim 14 is connected to an existing optical communication network and includes an optical transmission path for transmitting light between the optical transmission means and the light transmission amount change detection means.
According to the fourteenth aspect, the detection can be performed without leaking the presence or absence of an obstacle such as a passerby or a traffic vehicle in the railroad crossing in an integrated manner with the existing information system.

   According to the sensor device of the present invention, by passing through the sheet-like light transmission means, the light transmission amount change detection means, and the object identification means, a passerby or a traffic vehicle left in the railroad crossing It is possible to quickly detect and classify obstacles and output an alarm. In addition, it is possible to detect the presence or absence of a passenger or a fallen object that has fallen from the platform at the boarding / exiting station, classify the obstacle, and output an alarm. This makes it possible to perform centralized monitoring control with less construction costs, facility costs, and operation costs compared to conventional sensor devices.

  Embodiments of the present invention will be described below with reference to FIGS. In these drawings, the same or corresponding parts are denoted by the same reference numerals.

  FIG. 1 is a configuration diagram illustrating an overall configuration of a sensor device that monitors obstacles on a track of a track railway according to the first embodiment of the present invention. As shown in FIG. 1, the sensor device for monitoring obstacles on the track of the track railway includes an optical fiber sensor 1 as an optical transmission means, an optical fiber 2 as an optical medium, a light source unit 3, and a light transmission amount change detection. A measuring device 6 including a light receiving / detecting section 4 as a means and an alarm generating section 5 as an alarm generating means is provided.

  The measuring device 6 includes a calculation unit such as a CPU and a memory. The memory is provided with an object identification table as threshold setting means. In the object identification table, thresholds corresponding to objects (weight of people, small animals, luggage, etc.) are set.

  The calculation unit performs a determination process as the alarm generation unit 5 using a calculation for digitizing the input signal, a detection value of the calculation result, and an object identification table.

  The optical fiber sensor 1 is a sheet-like optical transmission means that is laid on the road across the railroad in the railroad crossing, that is, on the entire railroad crossing, and varies the amount of transmitted light according to the pressing force applied from above. It is.

  The light source unit 3 emits light. The optical fiber 2 transmits the light emitted from the light source unit 3 to the light receiving / detecting unit 4.

  The light receiving / detecting unit 4 receives light and detects a change in the transmission amount of light transmitted through the optical fiber 2 of the optical fiber sensor 1.

  The light receiving / detecting unit 4 detects a change in the amount of light transmitted through the optical fiber 2 (transmitted light).

  Light emitted from the light source unit 3 is transmitted through the optical fiber 2 and passes through the optical fiber sensor 1. At this time, when a load is applied to the upper surface of the optical fiber sensor 1, light leakage occurs, so that the light intensity P is reduced by ΔP to become transmitted light having an intensity P−ΔP.

  The light receiving / detecting unit 4 receives this transmitted light and converts it into an electric signal, and sends this electric signal to the alarm generating unit 5. The alarm generating unit 5 digitizes the electrical signal received from the light receiving / detecting unit 4 to obtain a detected value, and the detected value, a threshold value set in advance in a memory, and an object identification table of an object (person, small animal, luggage, etc.) Based on the above, the object to which the pressing force is applied to the optical fiber sensor 1 is identified, and an alarm corresponding to the identified object is given. As an example, the alarm generation unit 5 compares the detection value obtained by digitizing the electric signal with the threshold value of the correspondence table, and determines that the object has fallen when the detection value falls below the threshold value of the correspondence table. Generate an alarm.

FIG. 2A is a diagram illustrating a configuration of the optical fiber sensor 1.
As shown in the figure, the optical fiber sensor 1 includes an intermediate member 8 as a base material, an optical fiber 2 as an optical medium laid on the intermediate member 8, and an overlay for protecting the optical fiber 2. The protective sheet 7a and the protective sheet 7b for the underlay are provided, and are formed in the form of a sheet having a size of about 1 to 1.5 m square.

  The protective sheet 7a and the protective sheet 7b are disposed so as to protect the upper and lower surfaces of the intermediate member 8 and the optical fiber 2 laid thereon. The protective sheet 7a and the protective sheet 7b may be integrated to cover and protect the intermediate material 8 and the optical fiber 2.

  The optical fiber 2 may be wired to a predetermined length on the intermediate material 8 having a concavo-convex surface, and disposed in a form covering the entire surface of the sheet. In addition, in order to integrate the optical fiber 2 and the intermediate material 8, a sandwich between a protective sheet such as a nonwoven fabric is further sandwiched between an upper protective sheet 7 a from above and a lower protective sheet 7 b from below. You may fix by pinching.

  The protective sheets 7a and 7b are preferably made of a material having excellent weather resistance, waterproofness and rigidity. In particular, the protective sheet 7b for the underlay is preferably made of a material that has a thermal expansion coefficient close to that of the asphalt of the road surface and is familiar.

  As the intermediate material 8, a material in which the surface on which the optical fiber 2 is laid is formed in an uneven shape, that is, a cloth material that generates stress strain is suitable.

FIG. 3 is a diagram illustrating an arrangement example of the optical fiber sensor 1.
As shown in the figure, in this example, 16 optical fiber sensors 1 are prepared, and a total of 12 optical fibers are arranged in the crossing, 4 in the horizontal direction and 3 in the vertical direction. Since rails 9 (tracks) are provided in the railroad crossing, four optical fiber sensors 1 are arranged in parallel between the rails 9 between the rails 9 and outside the rails 9.

  If it does in this way, since sensing for every optical fiber sensor 1 is performed, positioning of an arrangement place can be performed. Two pairs of optical fibers for emitted light and transmitted light from the optical fiber 2 are extended to a measuring instrument 6 (not shown) in a bundle.

  On the surface of the covering protective sheet 7a of the optical fiber sensor 1, advertising information such as information on public facilities and public events, pictures, coloring, and advertisements is printed. In addition, as the advertisement information on the surface of the covering protective sheet 7a, a guideline such as an arrow indicating a direction, a store (for example, a restaurant), or a public facility (for example, a city hall) may be printed.

  FIG. 4 shows a signal detected by the light receiving / detecting unit 5 in the measuring device 6. The horizontal axis is the measurement time. The vertical axis represents the measurement light intensity, but the voltage is converted. In the figure, at the normal time, the measurement light intensity is set to a normalized value of 1000. For example, when a load is applied while sitting or sleeping on the optical fiber sensor 1, the optical fiber sensor 1 responds and the measurement light intensity becomes 300 or 800.

  In addition, when there are a plurality of fiber series, the placement location can be positioned as described above.

  The construction of laying the optical fiber sensor 1 on the road surface in the railroad crossing is only affixing the optical fiber sensor 1 to the road surface, and the optical fiber sensor 1 and the optical fiber 2 are simply connected by welding or a connector. It is very simple.

  According to the present embodiment, it is possible to reduce the construction cost, the equipment cost and the operation cost compared with the conventional sensor device when detecting the presence of a person or vehicle in the railroad crossing or outputting an alarm. Thus, it is possible to configure a sensor device that performs centralized monitoring control at a remote location.

  The railroad track monitoring sensor device according to the second embodiment of the present invention detects the presence of a person or an object that has fallen from a station platform and outputs an alarm. The overall configuration is basically shown in FIG. Is the same. Therefore, the components and functional operation of the railway track monitoring sensor device are the same as those in the first embodiment.

  FIG. 5 is an image diagram showing a situation when a person or an object falls from the platform 10 of the station. A predetermined optical fiber sensor 1 is laid along both sides of the rail 9 corresponding to the platform 10. When a passenger or an object falls from the platform 10, the optical fiber sensor 1 detects the falling object and generates a signal due to a change in light intensity. This signal is transmitted to the measuring instrument 6 through the optical communication line 11. The input signal is analyzed and an alarm is generated.

FIG. 6 conceptually displays signals detected by the light receiving / detecting unit 5 in the measuring device 6. The horizontal axis is the measurement time t, and the vertical axis is the output voltage V obtained by voltage-converting the measurement light intensity signal.
In the figure, assuming that the output voltage V when there is no detected object at normal time is the threshold value a and the threshold value of the voltage smaller than the threshold value a is b, The output voltage V becomes an intermediate output voltage of b, and the output voltage V when the person falls is lower than the threshold value b.

  Thus, by classifying the output voltage with the magnitude of the output voltage as a threshold, the type of fallen object can be roughly determined.

FIG. 7 is a flowchart showing a flow for determining the type of the falling object and a processing method after the determination.
In the figure, first, the light source unit 3 emits an optical signal to the optical fiber sensor 1 (step S1).

  The optical fiber sensor 1 causes light leakage of the emitted light according to the load on the optical fiber sensor 1 to attenuate the light intensity. The light receiving / detecting unit 4 detects the optical power of the optical signal transmitted through the fiber sensor 1 and converts the optical power into a voltage V (step S2).

  The alarm generation unit 5 compares the converted voltage V with a predetermined voltage threshold value a at time t, determines that there is no detection object if V is larger than the threshold value a, and waits until the next time t + ΔtV. If it is smaller than the threshold value a, the comparison is further advanced (step 3).

  At the time t, the voltage V is compared with a predetermined threshold value b smaller than the threshold value a. If V is larger than the threshold value b, it is determined that a small animal / luggage has fallen, and an emergency bell provided at the home is ringed. To the station staff (step S5).

  If V is smaller than the threshold value b, it is determined that a person has fallen, and an emergency bell or the like provided in the platform is ringed to notify the station staff (step S6).

  In addition, by providing the alarm generation unit 5 with a wireless notification function, a message or alarm signal is transmitted wirelessly to a mobile terminal possessed by a station staff, a train alarm device or an automatic stop device, and the user is heading home. You can stop the immediate train.

  The wireless notification function is realized, for example, by providing a wireless LAN communication adapter between the alarm generation unit 5 and the portable terminal. Further, a wide area wireless communication function such as a mobile phone network or satellite communication is used between the alarm generation unit 5 and the train.

  As described above, according to the present embodiment, when detecting the presence of a person or an object that has fallen from the platform of the railway track station and outputting an alarm, the construction cost, the equipment cost and the operation cost are compared with the conventional sensor device. It is possible to configure a railway track monitoring sensor device that performs centralized monitoring control at a remote place with low cost.

FIG. 8 is a configuration diagram illustrating the configuration of the railway track monitoring sensor device according to the third embodiment of the present invention. The railway line monitoring sensor device includes optical fiber sensors 1a to 1c, trimming boxes 12a, 12b, and 12c, optical fibers 2a to 2c, parts 11a and 11b of an existing optical communication line 11, and a light source. Unit 3, light receiving / detecting unit 4, and alarm generating unit 5 (not shown).
In the figure, the optical fiber 2 is characterized in that a part 11a, 11b of the optical communication line 11 is used. The existing optical communication line 11 is an optical communication line which is one of existing communication infrastructures provided by a telephone company or a cable television company.

  Of the optical communication line 11, 11a and 11b are used for long-distance transmission. As a connection point for a long distance, a trim box 12a is used for connecting the light source unit 3. A trim box 12b is used to connect the optical fiber sensors 1a, 1b and 1c. For the connection of the light receiving / detecting unit 3, a trim box 12c is used.

  The three signals from the light source unit 3 pass through the three optical fibers 2a and enter the trimming box 12a. From the trimming box 12a, the three optical fibers in the optical communication line 11a pass through. And enters the trim box 12b. Further, from the trimming box 12b, the optical fiber sensors 1a, 1b and 1c pass through the three optical fibers 2b, pass through them, and enter the trimming box 12b again. Further, the trim box 12b enters the trim box 12c through the three optical fibers in the optical communication line 11b. Furthermore, from the trimming box 12c, the light receiving / detecting unit 3 enters the three optical fibers 2c.

  According to the present embodiment, since the optical fiber 2 that transmits light is connected between the optical fiber sensor 1 and the light receiving / detecting unit 3 through a part of the existing optical communication network, the conventional sensor device. Compared to the above, it is possible to configure a railway track monitoring sensor device that performs centralized monitoring control in a remote place with less construction costs, facility costs, and operation costs.

  FIG. 9 is an explanatory diagram showing a method of laying the optical fiber sensor 1 on, for example, a crossing road surface.

  The optical fiber sensor 1 is laid on the road surface 14 with an adhesive 13 on the bottom surface. The adhesive 13 is preferably made of an asphalt material that is familiar with asphalt.

  According to the present embodiment, even if there is a large amount of traffic of people or vehicles, the spread of the optical fiber sensor 1 can be maintained steadily over a long period of time. It is possible to configure a railway track monitoring sensor device that performs centralized monitoring control at a remote place with less equipment and operating costs.

  FIG. 10 is an explanatory diagram showing a method of laying the optical fiber sensor 1 in the track corresponding to the station platform.

  The optical fiber sensor 1 has its bottom surface attached to a pedestal 17 with an adhesive 13, and an integrated one is laid in the line. The pedestal 17 may be set in advance as in the road surface of the fourth embodiment before the optical fiber sensor 1 is attached. The pedestal 17 is preferably one having good rigidity and weather resistance.

  According to the present embodiment, it becomes possible to lay on an uneven surface like gravel in a railway line, so that construction costs, facility costs and operation costs are low compared to conventional sensor devices, and remote areas It is possible to configure a railroad track monitoring sensor device that performs centralized monitoring control.

  FIG. 3 shows an example in which advertising information such as direction indications, cautions, and building advertisements is printed on the surface of the upper protective sheet 7a of the optical fiber sensor 1.

  Thus, by printing the advertisement information on the upper surface of the optical fiber sensor 1, it is possible to effectively give direction instructions and advertisement of the building to people and vehicles crossing the railroad crossing.

  The sensor device of the present invention performs centralized monitoring control at a remote place with low construction cost, equipment cost and operation cost when detecting a specific existence in a specific plane area and outputting an alarm. It can also be applied to applications that are indispensable.

  The above has been described with a focus on railway vehicles. In addition to railway vehicles, buses and other automobile vehicles are also monitored on the aisle with people and objects at intersections, bus stop areas and large parking lots. It can also be applied to prevent contact accidents.

The conceptual diagram which shows the basic composition of the sensor apparatus for railroad track monitoring. The conceptual diagram which shows the basic composition of an optical fiber sensor. The affixing conceptual diagram of the optical fiber sensor on a level crossing road surface. The measurement figure which shows the output condition of a light receiver and a detector. The conceptual diagram of the optical fiber sensor installation in the track | line under a platform. The measurement figure which shows the output condition of a light receiver and a detector. The flowchart which shows the flow of a sensor apparatus for railroad track monitoring, and a processing method. The conceptual diagram which shows the other basic composition of the sensor apparatus for railroad track monitoring. The conceptual diagram which shows the sticking method of the optical fiber sensor on a level crossing road surface. The conceptual diagram which shows the optical fiber sensor installation method in the track | line under a platform.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1a, 1b, 1c ... Optical fiber sensor, 2, 2a, 2b, 2c ... Optical fiber, 3 ... Light source part, 4 ... Light reception / detection part, 5 ... Alarm generation part, 6 ... Measuring apparatus, 7a, 7b ... Protective sheet, 8 ... intermediate material, 9 ... rail, 10 ... platform, 11, 11a, 11b, 11c ... optical communication line, 12a, 12b, 12c ... trim box, 13 ... adhesive, 14 ... road surface, 15 ... Ground, 16 ... gravel, 17 ... pedestal.

Claims (14)

A sensor device for detecting an obstacle on a track of a railway,
A sheet-like optical transmission means that is laid on the road surface in the railroad crossing of the track railway and varies the amount of light transmission according to the pressing force applied from above;
A light transmission amount change detecting means for detecting a change in the amount of light transmitted through the light transmission means;
A sensor device comprising: an object identification unit for identifying an object obtained by applying a pressing force to the light transmission unit based on a change in the transmission amount of light detected by the light transmission amount change detection unit. The optical transmission means includes
An optical medium that transmits the light and changes the amount of transmitted light according to the pressing force;
The sensor device according to claim 1, further comprising: a protective sheet that is disposed around or above and below the optical medium and protects the optical medium.   The sensor device according to claim 1, wherein the optical transmission unit displays advertisement information on an upper surface thereof.   The sensor device according to any one of claims 1 to 3, further comprising an alarm generation unit that generates an alarm according to a type of an obstacle identified by the object identification unit. The object identification means includes
A threshold setting means in which a threshold according to the type of the obstacle is set;
An object determination unit for identifying an object applied with a pressing force to the light transmission unit based on a light transmission amount detected by the light transmission amount change detection unit and a threshold set by the threshold setting unit; The sensor device according to claim 1, wherein the sensor device is a sensor device.   The sensor device according to claim 5, wherein the threshold value setting unit includes a first threshold value for determining the obstacle and a second threshold value for determining the type of the obstacle.   The optical transmission path that is connected to an existing optical communication network and transmits light between the optical transmission unit and the light transmission amount change detection unit is provided. Sensor device. A sensor device for detecting an obstacle on a track of a railway,
A sheet-like optical transmission means that is laid along the track of the flat platform in the railroad railroad entrance and exit, and varies the amount of transmitted light according to the pressing force applied from above;
A light transmission amount change detecting means for detecting a change in the amount of light transmitted through the light transmission means;
A sensor device comprising: an object identification unit for identifying an object obtained by applying a pressing force to the light transmission unit based on a change in the transmission amount of light detected by the light transmission amount change detection unit. The optical transmission means includes
An optical medium that transmits the light and changes the amount of transmitted light according to the pressing force;
The sensor device according to claim 8, further comprising a protective sheet that is disposed around or on an upper and lower surface of the optical medium and protects the optical medium.   The sensor device according to claim 8 or 9, wherein the optical transmission unit displays advertisement information on an upper surface thereof.   11. The sensor device according to claim 8, further comprising an alarm generation unit that generates an alarm according to a type of an obstacle identified by the object identification unit. The object identification means includes
Threshold setting means in which a threshold according to the type of the obstacle is set;
An object determination unit for identifying an object obtained by applying a pressing force to the light transmission unit based on a light transmission amount detected by the light transmission amount change detection unit and a threshold set by the threshold setting unit. The sensor device according to claim 8, wherein the sensor device is a sensor device.   The sensor device according to claim 12, wherein the threshold setting unit includes a first threshold for determining the obstacle and a second threshold for determining the type of the obstacle.   The optical transmission path connected to the existing optical communication network and transmitting light between the optical transmission means and the light transmission amount change detection means, The optical transmission path according to any one of claims 8 to 13, Sensor device.

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