JP3166038B2 - Fire monitoring system for mechanical parking lots - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire monitoring system for a mechanical parking lot.

[0002]

2. Description of the Related Art In recent years, mechanical parking lots utilizing three-dimensional spaces have been constructed from the viewpoint of effective use of land.
In this parking lot, vehicles are automatically moved in and out of the parking section of the multi-stage parking stage using transport means such as elevators and traveling trolleys. It's getting attention because you can park. Although this parking lot has a fire extinguishing system, in consideration of the fact that there is no room for humans in the parking lot, this system is all automatic. That is, in this system, a fire detector is arranged at an appropriate interval on the ceiling of each parking stage, and when the fire detector detects a fire, a sprinkler head or a foam head within a range covered by the fire detector is set. It operates and extinguishes fire automatically.

[0003]

In a conventional fire detector, a wide area is monitored on a ceiling or the like, and fire extinguishing means accompanying the discharge also discharges a large amount of water. In a parking lot, it is preferable to discharge water directly to a fire vehicle, and for that purpose, it is necessary to identify the fire vehicle. In a mechanical parking lot, since vehicles are housed in a three-dimensional manner, conventional methods of installing detectors cannot detect fires in vehicles in hidden locations. Vessels must be provided.
However, this method requires a large number of sensors,
In addition, a complicated device for managing it is required. Therefore, the installation work is troublesome and the installation cost is high.

SUMMARY OF THE INVENTION [0004] In view of the above circumstances, it is an object of the present invention to detect a fire in a mechanical parking lot at an early stage and easily know which vehicle has a fire.

According to the present invention, there are provided a plurality of parking portions formed in a parking lot, an optical fiber disposed through each of the parking portions,
A light source unit for injecting pulsed laser light from the entrance end of the optical fiber, a light detection unit for detecting backscattered light from inside the optical fiber, and a parking unit where a fire has occurred based on a signal from the light detection unit and a position detection unit for identifying the
Optical fibers are looped or coiled in each parking area.
It is an object of the present invention to achieve the above object by providing a fire monitoring system for a mechanical parking lot, which is provided.

[0006]

When a fire occurs in a parked vehicle, a part of the optical fiber in the parking portion of the vehicle is heated to increase the intensity of the backscattered pulsed laser light. The light detection unit that has received the large backscattered light determines the distance of the heated position from that timing. From the heated position of the optical fiber, the parking section where the fire has occurred is specified, and the fire extinguisher is started.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to the accompanying drawings, wherein the same reference numerals have the same names and functions.
As shown in FIGS. 1 and 3, a mechanical parking lot 1 is provided with a plurality of parking stages 3 having a plurality of parking units 2. On the side of the parking stage 3, a transport path 6 for a traveling vehicle 5 that slides on rails 4 is provided, and the transport path 6 is connected to a vertical path 9 of an elevator 8. The vehicle G is moved to the predetermined parking section 2 by the elevator 8 of the traveling carriage 5.
Park at a.

The core 2 is provided on the ceiling surface F of the parking sections 2a to 2L.
One optical fiber 20 having the above-mentioned three parking portions 2a to 2
It is disposed through 2L. The entrance end 20a of the optical fiber 20 faces the monitoring device 40 at an interval. This monitoring device 40 is, as shown in FIG.
4, a light detection unit 21 and a position detection unit 22. The light source unit 24 causes a pulsed laser beam 25 having an intensity equal to or higher than the Raman threshold to enter the entrance end 20a.
A condenser lens 2 is provided between the light source 24 and the entrance end 20a.
6, 27 and a two-color half mirror 28 are provided. The light detector 21 is a detector composed of a photodiode and detects backscattered light from inside the optical fiber 20. The scattered light (reflected light) 29 is folded by a half mirror 28 in a direction perpendicular to the laser light 25. It bends and reaches the light detection unit 21 via the condenser lens 30. The position detector 22 is an oscilloscope in this case, processes the output signal of the detector 21, and detects the portion of the optical fiber 20 located at the fire occurrence location.

Next, the operation of this embodiment will be described.
When the light source unit 24 is driven to generate the laser light 25, the laser light 25 passes through the condenser lenses 26 and 27 and the two-color half mirror 28 and enters the entrance end 20 a of the optical fiber 20. The laser light 25 has a pulse-like intensity (frequency ν) equal to or higher than a threshold called a Raman threshold. In this manner, when the laser light 25 is incident, the scattered light ν-Δν (referred to as Stoke light) and the scattered light ν + Δ whose frequency has been changed by the frequency Δν inherent in the material constituting the optical fiber 20.
ν (referred to as anti-Stoke light). All of these stalk lights obtained by the stimulated Raman effect are coherent light and have good monochromaticity, and their intensities are comparable to the incident light. Further, these intensities have temperature dependence. The scattered light (reflected light) 29 is reflected from the inside of the optical fiber 20, branched by the two-color half mirror 28, and reaches the light detection unit 21. The signal output from the light detection unit 21 is input to the position detection unit 22, where the occurrence state of the scattered light 29 is grasped.

A fire occurs in the parking section 2a, and the optical fiber 2
When the portion of the parking portion 2a at 0 is heated, the intensity of the scattered light (reflected light) generated in this portion changes. The change in the intensity of the reflected light 29 corresponds to the change in the intensity of the reflected light 29 on the oscilloscope at the time difference corresponding to the distance from the input end 20a to the parking section 2a, that is, the fire point. Therefore, the reflected light 29
By detecting the time change from the intensity change and the pulse emission time to the fire point, the temperature change on the optical fiber and the position of the fire part can be detected. If this position detection is performed using a microcomputer, it is possible to automatically perform from fire detection to position detection.

The embodiment of the present invention is not limited to the above. For example, as shown in FIG. 4, two optical fibers 41 and 42 are arranged in a matrix on the ceiling surfaces of parking portions a to f. can do. Second Embodiment In this way, for example, when a fire occurs in the parking section d, both the optical fibers 41 and 42 detect the fire in the parking section d at the same time. Fire determination can be performed more accurately than monitoring.

As shown in FIG. 5, the optical fiber 50 at the center of each of the parking sections a to c is wound in a coil shape (third embodiment), and further, as shown in FIG. May be formed in a loop shape. (Fourth embodiment)

As shown in FIG. 7, one optical fiber 70 is disposed on each of the ceiling surface F and the floor surface D of each of the parking sections a to c, or a plurality of optical fibers 70 are disposed respectively. You may. (Fifth embodiment)

Since the present invention is constructed as described above, a change in the intensity of reflected light due to the occurrence of a fire is detected by the position detection unit via the light detection unit, and the fire occurrence position is detected there. You. Therefore, a vehicle in which a fire has occurred can be found early and easily.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention.

FIG. 2 is a schematic diagram of a monitoring device.

FIG. 3 is a sectional view taken along line III-III of FIG. 1;

FIG. 4 is a plan view showing a second embodiment.

FIG. 5 is a plan view showing a third embodiment.

FIG. 6 is a plan view showing a fourth embodiment.

FIG. 7 is a plan view showing a fifth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mechanical parking lot 2a-2L Parking part 20 Optical fiber 20a Entrance end 21 Light detection part 22 Position detection part 24 Light source part

────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI G02B 6/32 G02B 6/32 (56) References JP-A-60-260811 (JP, A) JP-A-57-148229 (JP) , A) JP-A-60-225297 (JP, A) JP-A-61-61458 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) A62C 37/00 A62C 3/07 E04H 6/18 E04H 6/42 G01B 11/00 G02B 6/32

Claims (2)

(57) [Claims] 1. A plurality of parking sections formed in a parking lot, an optical fiber disposed through each of the parking sections, and a light source section for inputting a pulsed laser beam from an entrance end of the optical fiber. comprises a light detector for detecting light backscattered from within the optical fiber, and a position detecting section for identifying the generated parking unit of the fire based on the signal of the light detector, and the optical fiber, each parking Loop or coil on part
A fire monitoring system for a mechanical parking lot, wherein the fire monitoring system is disposed in a parking lot. 2. A parking lot formed in a parking lot,
An optical fiber disposed through the parking portion and the optical fiber;
Light source that emits pulsed laser light from the entrance end of the bar
Part and light for detecting backscattered light from within the optical fiber
A detection unit, and a parking unit where a fire occurs based on a signal from the light detection unit.
A position detecting unit for identifying a vehicle unit, wherein the optical fibers are arranged in a matrix in each parking unit.
Fire monitoring system of the mechanical parking and wherein the being.