JP3653304B2 - Fire detection device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a fire detection device, and more particularly, to a fire detection device in which the installation of the device is simple, a fire occurrence position can be accurately identified, and fire detection and fire condition monitoring can be performed in parallel.
[0002]
[Prior art]
Conventionally, as shown in FIG. 5, a fire detector 51 that detects heat, smoke, and the like to notify the occurrence of a fire, a monitoring camera 52 disposed near the place where the fire detector 51 is installed, There has been proposed a fire detection device including an alarm controller 53 that receives a fire signal f ₁₁ output from the sensor 52 and a television monitor 54 that monitors a video signal f ₁₂ captured by the monitoring camera 52.
[0003]
The output side of the fire detector 51 is connected to the power supply control side of the television monitor 54 via the alarm controller 53, and the output side of the monitoring camera 52 is connected to the video input side of the television monitor 54.
In such a fire detection device, when the fire detector 51 detects a fire due to heat, smoke or the like, a fire signal f ₁₁ is output to the alarm controller 53. Alarm control unit 53 receives a fire signal f _11, turning ON the power of the television monitor 54. The monitoring camera 52 images the vicinity of the place where the fire detector 51 is installed and outputs a video signal video signal f ₁₂ to the television monitor 54. The television monitor 54 can monitor the vicinity of the place where the fire has occurred due to these operations.
[0004]
[Problems to be solved by the invention]
Since the conventional fire detection device is configured as described above, the fire detector 51 that detects heat, smoke, and the like and the monitoring camera 52 that images the fire situation must be installed separately, and the location of the fire cannot be specified. There is a difficulty.
[0005]
OBJECT OF THE INVENTION
SUMMARY OF THE INVENTION An object of the present invention is to provide a fire detection device in which the installation of the device is simple, the fire occurrence position can be specified accurately, and fire detection and fire status monitoring can be performed in parallel.
[0006]
[Means for Solving the Problems]
In order to achieve such an object, the fire detection apparatus according to the present invention includes a first photodiode that detects near infrared rays and outputs a fire signal and a second photodiode that detects visible light and outputs a video signal. A camera that uses a CCD having a two-dimensional matrix configuration as an image sensor, an alarm controller that receives a fire signal, a television monitor that is turned on by the alarm controller to monitor a video signal when the fire signal is received, and It has.
[0007]
[Action]
When near-infrared light is detected by the first photodiode of the camera, a fire signal is sent from the camera to the alarm controller.
When the alarm controller receives the fire signal, the TV monitor is turned on. Visible light detected by the second photodiode of the camera is output as a video signal and monitored by a TV monitor that is turned on to accurately identify the fire occurrence location, and fire detection and fire status monitoring are performed in parallel. be able to.
[0008]
【Example】
Hereinafter, an embodiment of the fire detection device of the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, the fire sensor apparatus according to the present invention, the second outputs of the first photodiode D ₁ and the video signal f ₂ sensing visible light for outputting a fire signal f ₁ senses near infrared A camera 1 using a CCD 2 configured with a two-dimensional matrix mixed with a photodiode D ₂ as an image pickup device, an alarm controller 21 for receiving a fire signal, and the power is turned on by the alarm controller when the fire signal is received. And a television monitor 22 for monitoring the video signal.
[0009]
The camera 1 includes a CCD image sensor 2, a reference signal oscillator 6a, a synchronization signal generator 6, a horizontal transfer pulse generator 7, a vertical transfer pulse generator 8, a horizontal m-ary counter 9, a vertical n-ary counter 10, an AND circuit 11, A fire detection photodiode position switch 12, an amplifier 13, and a comparator 14 are provided.
CCD image sensor 2 is a horizontal shift register 4, the vertical shift register 5 has a discharge circuit 15 and the signal Baffua 4a, becomes the second photodiode D ₂ and the vertical CCD switch VS and a pair of sensing visible light A two-dimensional matrix is formed, and the first photodiode D ₁ that senses near infrared rays is mixed in places of the _second photodiode D ₂ .
[0010]
One of the vertical CCD switches VS... Is connected to the cathode of the _first photodiode D ₁ or the second photodiode D ₂ whose anode is connected to the reference potential point, and the other is the vertical signal line 16. It is connected to the. The gate side of the vertical CCD switch VS... Is connected to the horizontal signal line 17, and one end of the horizontal signal line 17 is connected to the vertical shift register 5. One end of the vertical signal line 16 is connected to the discharge circuit 15, the other end is connected to one of the horizontal CCD switches HS..., And the other is connected to the video signal line 3. The gate side of the horizontal CCD switch HS... Is connected to the horizontal shift register 4.
[0011]
The video signal line 3 is connected to the input side of the signal buffer 4 a, and the output side is connected to the video input side of the television monitor 22.
The horizontal shift register 4 generates the horizontal transfer pulse φ ₁ output from the horizontal transfer pulse generator 7, the vertical shift register 5 generates the synchronization signal φ ₀ output from the synchronization signal generator 6, and the discharge circuit 15 generates the vertical transfer pulse. The vertical transfer pulses φ ₂ output from the device 8 are respectively input.
[0012]
The video signal photodiode D ₂ is provided corresponding to, for example, about 500 pixels (light / electric conversion elements) of the vertical CCD switch VS... Serving as a transfer electrode, and 500 pixels of the vertical CCD switch VS. Of about 700. For this reason, the total number is about 350,000 pixels.
Of the 350,000 pixels, the first photodiode D ₁ for fire signal is mixed as appropriate so as not to affect the video signal f ₂ .
[0013]
The output side of the reference signal oscillator 6a via a synchronization signal generator 6 which outputs a synchronizing signal phi _0, generates a horizontal transfer pulse generator 7 and the vertical transfer pulse phi ₂ of 60Hz for generating a horizontal transfer pulse phi ₁ of 15734Hz The vertical transfer pulse generator 8 is connected to the input side of the vertical shift register 5 and the vertical n-ary counter 10 respectively.
The output side of the vertical transfer pulse generator 8 is connected to the discharge circuit 15.
[0014]
The output side of the horizontal transfer pulse generator 7 is connected to the input side of the horizontal shift register 4 and the horizontal m-ary counter 9.
Each output side of the horizontal m counter 9 vertical n-ary counter 10 is connected to the input side of the AND circuit 11, an output side for outputting a fire signal read pulse phi ₃ control side of the fire photodiode position switch 12 One of the fire detection photodiode position switches 12 is connected to the output side of the signal buffer 4 a of the CCD image sensor 2, and the other is connected to the alarm controller 21 via the amplifier 13 and the comparator 14.
[0015]
Normally, the CCD image sensor 2 is composed only of the _second photodiode D ₂ that senses the visible light region, but the CCD image sensor 2 used in the fire detection device according to the present invention is composed of indium arsenide (InAs). ) And the like, and the first photodiode D ₁ having the highest sensitivity in the wavelength range of 1 to 4 μm is mixed so as not to cause image degradation.
[0016]
As is clear from the relationship between the energy and wavelength of the black body shown in FIG. 2, the first photodiode D ₁ indicated by a broken line in the CCD image sensor 2 of FIG. ₁ has a wavelength of (2) corresponding to the visible light region. It can be seen that the energy is detected and the fire signal f ₁ is output for the temperature in the region (1) (wavelength range of 1 to 4 μm) emitted by the object that has reached the ignition temperature.
[0017]
In the characteristic diagram of FIG. 2, the horizontal axis represents the wavelength of light (μm), the vertical axis represents the radiation divergence per square centimeter (W / square cm), and each curve represents the absolute temperature.
The operation of the fire detection device according to the present invention will be described below.
When a fire or the like occurs and an object that emits energy of 1 to 4 μm in wavelength is found within the imaging range, the pixel corresponding to the _first photodiode D ₁ senses near infrared rays and outputs a fire signal f ₁ To do.
[0018]
If the fire signal f ₁ output from the first photodiode D ₁ is monitored, the occurrence of a fire can be detected.
Thus, when the CCD camera 1 senses the occurrence of a fire, the fire signal f ₁ is output to the alarm controller 2. An alarm controller 2 receives the fire signal f _1, and ON the power of the TV monitor 3, monitors the video signal f ₂ of the imaging range.
[0019]
The operation of the CCD image sensor 2 shown in FIG. 1 in such a fire detection device will be described with reference to FIGS. FIG. 3 shows an example in which photodiodes are arranged in three columns and five rows. The photodiodes in the first row are pixels N ₁₁ , N ₂₁ and N ₃₁ , and the second row is pixels N ₁₂ , N ₂₂ and N _32. The third row constitutes pixels N ₁₃ , N ₂₃ , N ₃₃ , the fourth row constitutes pixels N ₁₄ , N _{24 ,} N ₃₄ , and the fifth row constitutes pixels N ₁₅ , N ₂₅ , N ₃₅ . Among these pixels N _{11 to} N _35, a first photodiode is respectively connected to a first row of pixels N ₂₁ , a third row of pixels N ₂₃ , and a fifth row of pixels N ₂₅ (subscripts indicate columns and rows). shall D ₁ is provided in advance.
[0020]
When the synchronization signal generator 6 outputs the synchronization signal φ ₀ (FIG. 4 (1)) by the reference signal oscillator 6a, it is sent to the vertical shift register 5. Since the vertical shift register 5 controls the vertical CCD switches VS... Connected to the horizontal signal lines 17 in the first row, the charges accumulated in the photodiodes in the first row are transferred to the vertical signal lines 16 in the first to third columns. To do. (Fig. 3 (A))
While the synchronizing signal φ ₀ is being sent to the vertical shift register 5, the horizontal transfer pulse φ ₁ (FIG. 4 (3)) of 15734 Hz is sequentially sent from the horizontal transfer pulse generator 7 to the horizontal shift register 4 and the horizontal CCD. Since the switch HS is controlled, the charges transferred to the vertical signal lines 16 in the first to third columns are output to the video signal line 3 as pixels N ₁₁ , N ₂₁ , and N ₃₁ . (Fig. 3 (B))
When all the pixels in the first row are output to the video signal line 3, a vertical transfer pulse φ ₂ (FIG. 4 (7)) of 60 Hz is sent from the vertical transfer pulse generator 8 to the discharge circuit 15 and 1 to 3 columns of vertical transfer pulses are output. The charge accumulated in the signal line 16 is discharged.
[0021]
When the next synchronization signal φ ₀ (FIG. 4 (2)) is sent to the vertical shift register 5, the vertical CCD switch VS... Connected to the horizontal signal line 17 in the second row is controlled, and the photodiode in the second row. Are transferred to the vertical signal lines 16 in 1 to 3 columns. (Figure 3 (C))
In the meantime, the horizontal CCD switch HS is controlled by the horizontal transfer pulse φ ₁ (FIG. 4 (4)) sequentially sent from the horizontal transfer pulse generator 7 to the horizontal shift register 4, and the vertical signal lines 16 in the first to third columns are controlled. The transferred charges are output to the video signal line 3 as pixels N ₁₂ , N ₂₂ and N ₃₂ . (Fig. 3 (D))
And outputs as a video signal f ₂ the accumulated charge from the output to the signal Baffua 4a to the video signal line 3 as a pixel to the photodiode by repeating the above operation.
[0022]
A timing operation for reading the _first photodiode D ₁ mixed in the _second photodiode D ₂ will be described. Since the position at which the _first photodiode D ₁ is arranged is determined in advance, when reading out the pixel, “H” is output from the vertical n-ary counter 10 and the horizontal m-ary counter 9 to the AND circuit 11. When input, a fire signal read pulse φ ₃ (5 in FIG. 4) is sent from the AND circuit 11 to the fire detection photodiode position switch 12. Even if the fire signal readout pulse φ ₃ is sent to the fire detection photodiode position switch 12, if the first photodiode D ₁ does not detect near infrared rays, the output of the signal buffer 4 a is small and is amplified by the amplifier 13. fire signal f ₁ is also lower than the reference voltage of the comparator 14 is not output. When the first photodiode D ₁ senses near-infrared light, the output of the signal buffer 4 a exceeds a certain level, and a fire signal f ₁ (FIG. 4 (6)) is output to the alarm controller 21 via the amplifier 13 and the comparator 14. To do.
[0023]
The alarm controller 21 turns on the TV monitor 22 when the fire signal f ₁ is input. When the TV monitor 22 is turned on, the video signal f ₂ sent from the video signal line 3 is output.
Thereby, the fire occurrence position can be accurately identified by the television monitor 22, and fire detection and fire condition monitoring can be performed in parallel.
[0024]
【The invention's effect】
As is clear from the above description, according to the fire detection device of the present invention, the installation of the device is simple, the fire occurrence position can be specified accurately, and fire detection and fire condition monitoring can be performed in parallel. .
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment of a fire detection device according to the present invention.
FIG. 2 is a characteristic diagram of a photodiode used in the fire detection device according to the present invention.
FIGS. 3A, 3B, 3C, and 3D are explanatory views showing the operation of the photodiode used in the fire detection device according to the present invention. FIGS.
FIG. 4 is an explanatory diagram of an operation sequence of the fire detection device according to the present invention.
FIG. 5 is a block diagram of a conventional fire detection device.
[Explanation of symbols]
1 ... Camera 2 ... CCD
21 ...... alarm controller 22 ...... television monitor D ₁ ...... first photodiode D ₂ ...... second photodiode f ₁ · · · ... Fire signal f ₂ ... Video signal

Claims (1)

A first photodiode (D ₁ ) that detects near infrared rays and outputs a fire signal (f ₁ ) and a second photodiode (D ₂ ) that detects visible light and outputs a video signal (f ₂ ) are mixed. A camera (1) using a CCD (2) configured in a two-dimensional matrix as an image sensor, an alarm controller (21) for receiving the fire signal, and the alarm controller when the fire signal is received. A fire detection device comprising a television monitor (22) that is turned on and monitors the video signal.

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