JPH03219394A - Detecting device for number of persons and fire - Google Patents

Abstract

PURPOSE:To exactly detect the number of persons and the generation of fire with simple configuration by discriminating the number of persons in the area from detected infrared radiation dose and discriminating the generation of fire based on the time change rate of the infrared radiation dose. CONSTITUTION:When a person P1 goes into a detection area A1 of a temperature sensor S1 at time t1, the temperature sensor S1 detects the infrared radiation dose for one person and a level change amount DELTAV of a detection signal SG is increased only for a unit change amount DELTAV1. A processor 14 and an elevator controller 15 detect that one person P1 goes into the detection area A1. Next, when fire is generated in a detection area A3 at time t5, the level of the detection signal SG from a temperature sensor S3 is increased in a short period. At such a time, when a level change amount DELTAV2 to unit time T1 is larger than the prescribed threshold value DELTAV1, the processor 14 judges fire is generated in the detection area A3. Thus, the number of persons and the generation of fire can be exactly detected.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a number of people and fire detection device installed in, for example, an elevator hall of a building, which detects the number of people in the hall and detects the occurrence of a fire. .

<Conventional technology> As a security system in a building, the number of people staying in the elevator hall on each floor is detected and control is performed to give priority to crowded floors or to run more elevators than other floors. There is. This allows the building as a whole to avoid congestion in the elevator hall and allows residents to move around within the building with as short a waiting time as possible. If such control is not performed, elevators will only be routed evenly to each floor even if each floor is unevenly crowded, making it difficult for the occupants to move efficiently.

To realize such control, it is necessary to accurately know the number of people in the elevator hall for each floor. Conventionally, as a device for performing this type of detection, a CCD (
Charge-coupled system) Camera l is configured to image a visitor 2 in an elevator hall, and count the number of black pixel areas 4 (assumed to be human heads) of a predetermined area or more in the obtained image data 3. something is known. Also, devices are used that emit ultrasonic waves or electromagnetic waves and detect the number of people from the reflected waves.

<Problems to be Solved by the Invention> However, the conventional technology using a CCD camera has the following problems.

First, CCD cameras are expensive, which increases the cost of equipment. Therefore, in many cases, only one unit is installed on each floor, and as a result, as shown in the image data in Figure 6 (2), image data of people captured in small distances may be ignored as not subject to measurement. This makes accurate elevator control difficult. Furthermore, when counting the number of visitors based on the number of black pixel areas in the image data as described above,
It is not possible to use a black background for the floor or wall, and furthermore, if the visitor's clothes are black, there is a risk of false detection.

Furthermore, conventional techniques using ultrasonic waves or electromagnetic waves have the problem of erroneously detecting items placed on the floor, resulting in a lack of reliability.

By the way, a system that automatically detects the occurrence of a fire is installed as a security system in a building, but since none of the above-mentioned people detection systems can detect the occurrence of a fire, it is necessary to install another device such as a smoke detection device. ,
There is a problem that the system configuration becomes complicated.

An object of the present invention is to solve the above-mentioned technical problems and provide a number of people and fire detection device that can accurately detect the number of people and also detect the occurrence of a fire.

<Means for Solving the Problems> The present invention includes an infrared ray amount detection means for detecting the amount of infrared rays from a detection area, and a number of people in the detection area based on the magnitude of the amount of infrared rays detected by the infrared ray amount detection means. The number of people and fire detection device is composed of a number of people discriminating means for detecting the number of people, and a fire discriminating means for discriminating the occurrence of a fire based on the time rate of change of the amount of infrared rays detected by the amount of infrared rays detecting means.

<Operation> When the amount of infrared rays from the detection area is detected by the amount of infrared rays detecting means, the number of people determining means determines the number of people in the detection area based on the magnitude of the amount of infrared rays, and from the time rate of change of the amount of infrared rays, A fire determination means determines the occurrence of a fire.

<Embodiment> FIG. 1 is a system diagram showing the configuration of an embodiment of the present invention, and FIG. 2 is a block diagram showing the electrical configuration of this embodiment.

The number of people and fire detection device (hereinafter referred to as "detection device") 11 of this embodiment is equipped with a plurality of temperature sensors 31 and S2.33 that detect the amount of infrared rays generated by an object. Temperature sensors S1-S3 are installed in the elevator hall on each floor of the building. There are multiple elevator doors 12 in the illustrated elevator hall,
Each temperature sensor 31 is mounted on the ceiling above each door. S2
．． S3 is installed.

Each temperature sensor S1 to S3 is connected via a signal line 13 to a processing device 14 realized by, for example, a computer.
connected to. This processing device 14 is a means for determining the number of people and a means for determining fire, and is provided on each floor, and receives detection signals SG from temperature sensors S1 to S3. The processing device 14 for each floor is connected to an elevator control device 15 that controls the operation of elevators throughout the building, and alarm devices r and 16 that issue an alarm when detecting the occurrence of a fire, as will be described later. connected to.

A thermoelectric body 17 for measuring the temperature of the elevator hall for each floor is connected to this processing device 14, and the detected ambient temperature signal T is used to correct the data detected by each of the temperature sensors S1 to S3. Further, a light amount sensor 18 for distinguishing between daytime and nighttime is connected to the processing device 14, and the operating state of the detection device 11 is switched based on the detected light amount signal. This processing device 14 includes a differential value calculation section 2
1, and the differential value of the detection signal SG and the light amount signal is calculated.

Each temperature sensor S1-S3 has an individual detection area A1. A2
．． A parabolic reflector 19 that collects infrared rays generated in A3, and a thermopile 20 that detects the amount of infrared rays.
It consists of:

FIGS. 3 and 4 show the waveforms of the detection signals SG of the temperature sensors S1 to S3, and the operation of detecting the number of people and the occurrence of a fire by the temperature sensors S1 to S3 will be described below based on the figures.

If a person P1 enters the detection area A1 of the temperature sensor S1 at time tl in FIG. 3, the temperature sensor S1 detects the amount of infrared rays for one person, and the level change Δ of the detection signal SG
V increases by a unit change amount Δ■1. Thereby, the processing device 14 and the elevator control device 15 determine that one person P1 has entered the detection area AI.

Next, at time t2, the detection signal S from the temperature sensor S2
The level change amount ΔV of G increases by the unit change amount Δ■1,
At time t3, it further increases by the unit change amount Δ■1,
When this is determined by the processing device 14, the processing device 14 detects two people P2 in the detection area A2. It is determined that P3 has entered continuously. Note that the detection signal S from the temperature sensor S3
There is no change in G, and the processing device 14 determines that there is no person in the detection area A3.

Next, in FIG. 4, assuming that a fire occurs within the detection area A3 at time t, the detection signal S from the temperature sensor S3 is
The level of G increases in a short period of time. At this time, unit time T1
If the level change amount Δ■2 is larger than the predetermined threshold value Δ■1 (ΔV, <ΔV2), the processing device 14 determines that a fire has occurred in the detection area A3.

FIG. 5 shows the control procedure of the processing device 14. The figure shows one temperature sensor (here, referred to as S1 for convenience), but if there are three temperature sensors, an OR process is performed for the alarm output, which will be described later, and an addition process is performed for the number of people output.

In step 1 of the figure (indicated by rsTIJ in the figure), the differential value dV/
Calculate di. In the next step 2, this differential value d
It is determined whether V/dt exceeds a predetermined reference value D1, and if ``NO'', no factors that generate significant infrared rays have occurred in the detection area A, such as the entry of a person P or the occurrence of a fire. It is determined that there is not, and the process returns to step 1. If the determination in step 2 is "YES", the process moves to step 3, and the differential value dL/of the light amount signal from the light amount sensor 18 is determined.
Calculate dt.

In step 4, it is determined whether this differential value dL/dt is smaller than a predetermined reference value D2, and "'NO" is determined.
If so, it is determined that there is a change in the amount of light due to the lighting being turned on or off, and after waiting for a predetermined time (for example, one minute) in step 5, the process returns to step 1.

If the determination in step 4 is "YES", it is assumed that no change in light amount has occurred, and the light amount level ΔL is inspected in step 6 to determine whether the lights are on during the day or are off at night. do.

If it is determined that it is daytime in step 7, the level change amount Δ■ of the detection signal SG from the temperature sensor S1 is detected in step 8, and the correction level change amount ΔVc corrected based on the ambient temperature signal T is calculated. Ru. Next, in step 9, this correction level change amount ΔVc is set to a predetermined reference value D3 (=
Δ■2), and this judgment is “Y”.
ES", it is determined that the level change of the detection signal SG is caused by a person entering the detection area A1. Then, in step 10, the correction level change amount ΔVc is determined based on a predetermined standard corresponding to one person. The number n of people P who have entered the detection area Al is determined by dividing by the value DM (=ΔV,), and in the next step 11, the processing device 14 outputs the number of people data n to the elevator control device 15. The process is performed for other sensors as well as for each floor of the building, making it possible to efficiently move people within the building using the elevator.After this, the process returns to step 1 and repeats the sequence described above. Repeat the process.

If the determination in step 9 is "NO", it is determined that the level change of the detection signal SG is caused by the occurrence of a fire, and the processing device 14 outputs a fire alarm to the alarm device 16 in step 12.

If it is determined in step 7 that it is nighttime, in step 13 the level change amount Δ■ of the detection signal SG from the temperature sensor S1 is determined.
is detected, and a correction level change amount ΔVc corrected based on the ambient temperature signal T is calculated. Next step 14
Then, it is determined whether or not this correction level change amount ΔVc is less than a predetermined reference value D4 which is smaller than the reference value D3. If this judgment is "YES", then in step 15, the correction level change amount ΔVc is determined. It is determined whether the value exceeds a predetermined reference value D5, which is smaller than the reference value D4. If this determination is ``YES'', it is determined that the change in the level of the detection signal ST is caused by the person P entering the detection area A1, and the processing device 14 issues an intruder alarm to the alarm device 16 in step 16. Output.

If the judgment in step 14 is NO, it is determined that the level change in the detection signal SG is caused by the occurrence of a fire, and in step 12 the processing device 14 sends a fire alarm to the alarm device 16. Output.

In this manner, in this embodiment, the number of people within the detection area is determined by detecting the amount of infrared rays generated by the human body. With such a configuration, the equipment cost is lower than the conventional configuration using a CCD camera and an image processing device, and therefore a relatively large number of temperature sensors can be installed in the same detection area, which eliminates the cost of conventional technology. It is possible to prevent the false detection described in . There are also no restrictions on the color tone of the floors or walls.

Although this embodiment is an example in which the present invention is applied to detect the number of people in an electric hall of a building and to detect the occurrence of a fire, the present invention is not limited to this. It can also be applied to an example where the number of people staying in a building is always known.

<Effects of the Invention> As described above, the present invention detects the amount of infrared rays from a detection area, determines the number of people in the detection area from the magnitude of the detected amount of infrared rays, and detects temporal changes in the amount of detected infrared rays. Since the occurrence of a fire is determined based on the rate, it is possible to accurately detect the number of people with a simplified configuration, and the occurrence of a fire can be detected using the same configuration, making it much easier to use. Improved.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the configuration of an embodiment of the present invention, and FIG.
The figure is a block diagram showing the circuit configuration of this embodiment, FIGS. 3 and 4 are waveform diagrams showing the detection signal of the temperature sensor, and FIG.
The figure is a flowchart showing the operating procedure of the processing device, and FIG. 6 is an explanatory diagram showing the configuration of a conventional example using a CCD camera. 11...Detection device 14...Processing device S
1~S3...Temperature sensor

Claims (1)

[Scope of Claims] An amount of infrared rays detecting means for detecting the amount of infrared rays from a detection area; a number of people determining means for determining the number of people in the detection area from the magnitude of the amount of infrared rays detected by the amount of infrared rays detected by the amount of infrared rays; 1. A detecting device for detecting the number of people and detecting a fire, comprising a fire discriminating means for discriminating the occurrence of a fire based on a time rate of change in the amount of infrared rays detected by the detecting means.