JPH0510825A - Disaster detecting device with thermal image detecting means - Google Patents

Abstract

PURPOSE:To enable a disaster detecting device to discover the occurrence of a fire in an early stage by detecting an abnormal heat source with a thermal image detecting means and, at the same time, to catch the abnormal heat source at the center of an image pickup frame by using a video camera in an interlocking way. CONSTITUTION:A thermal image detecting means 3 is provided on a main body supporting section 2 so that the means 3 can be oriented in the detecting direction. In addition, a video camera 1 is fixed to a lens direction setting means 4 mounted on the supporting section 2 and provided with a rotating mechanism.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disaster prevention detection device in a building.

[0002]

2. Description of the Related Art Conventionally, an infrared sensor system has been mainly used as a disaster prevention detecting device in a building.

As a fire detection method, the infrared rays emitted from the light emitting element 8 are reflected by the smoke particles 11 in a dark box having a hole through which the smoke 11 enters as shown in FIG. The fire was detected by detecting the presence or absence of.

As an intruder detection method, a method of detecting intrusion of a human body by detecting infrared rays emitted from the human body shown in FIG. 7 by a light receiving portion 9, and an infrared ray emitted from a light emitting element 8 shown in FIG. Alternatively, the light receiving unit 9 is blocked by an object.
There was a method to detect the intrusion of the human body by the presence or absence of infrared rays.

[0005]

In the conventional example shown in FIG. 6, it is difficult to detect a fire early because it is judged by detecting smoke.

In the conventional example shown in FIG. 7, the presence or absence of a human body can be detected, but the position of the human body cannot be detected. In the conventional example shown in FIG. 8, the position of the human body can be detected only at a certain position, and the range is wide. Not suitable for detection.

[0007]

In order to solve the above problems, the present invention uses a thermal image detecting means composed of a pyroelectric type heat detecting element group which produces an output only when an incident temperature changes, and an abnormal state is obtained. Is detected and the position where there is a temperature change from the previous state is obtained.

Further, according to the present invention, the video camera and the video camera supporting portion connected to the outside are connected by a lens direction setting means composed of a one-dimensional rotating mechanism, and the thermal image detecting means is connected to the main body supporting portion. The heat source position detecting means determines the position of the detected abnormal state while fixing and fixing it in a face-to-face relationship with the detection direction, and operates the lens direction setting means.

Further, the present invention judges whether or not there is a fire based on the temperature of the abnormal state portion obtained by the thermal image detecting means,
It detects a fire.

Further, according to the present invention, the human body is detected and the position of the detected human body is detected by the change of the thermal image obtained by the thermal image detecting means.

Further, the present invention is to generate a signal to the outside depending on the presence or absence of an abnormal state obtained by the thermal image detecting means.

Further, according to the present invention, a pyroelectric thin film is used in the pyroelectric heat detecting element group. According to the present invention, the pyroelectric heat detecting element group is one-dimensionally arranged on a linear axis and has a rotation axis parallel to the linear axis or inclined by a certain angle, and the focus is about the rotation axis. A two-dimensional image is obtained by rotating the electric heat detection element group.

[0013]

According to the present invention, an abnormal state can be detected at an early stage by using a thermal image, and automatic detection of a video camera is realized by detecting a position.

[0014]

Embodiments of the present invention will be described with reference to FIGS. 1 to 5.

FIG. 1 shows an embodiment of the present invention. In the figure, 1 is a video camera, 2 is a main body supporting portion, 3 is a thermal image detecting means, and 4 is a lens direction setting means having a two-dimensional horizontal and vertical rotating mechanism.

The thermal image detecting means 3 is attached to the main body supporting portion 2, and is arranged in a face-to-face relationship in the detection direction to detect the presence or absence and the position of the abnormal heat source, and the lens direction setting means 4 turns the video camera 1 into the abnormal heat source. It controls to point.

The thermal image detecting means 3 has a plurality of pyroelectric heat detecting element groups built therein. Non-contact temperature measurement methods include a quantum infrared sensor, an infrared CCD sensor, and a thermal infrared sensor. The quantum infrared sensor and the infrared CCD have high sensitivity and fast response speed, but require cooling (about -100 to -200 ° C) and are not suitable for consumer use. On the other hand, the thermal infrared sensor has a relatively low sensitivity and a slow response speed, but it does not require cooling. The thermal image detecting means 3 utilizes the pyroelectric effect in the thermal infrared sensor.

FIG. 2 is an internal block diagram of the disaster prevention detector of the present invention. The main body support portion 2 includes a thermal image detecting means 3, an abnormal heat source determining means, an abnormal heat source position determining means, and an abnormal signal external output means.

The thermal image detection means 3 detects a thermal image including a human body, a fire, etc., and the abnormal heat source determination means and the abnormal heat source position detection means determine the abnormal heat source (intruder, fire, etc.) and determine the position, The lens direction setting means is operated to adjust the direction of the lens of the video camera.

FIG. 3 is an explanatory view of the function of the embodiment of the present invention. This figure is a superposition of the thermal image and the visible image.

When an abnormal heat source which does not exist in the previous state is confirmed as in the thermal images of FIGS. 3A and 3B, the abnormal signal external output means outputs a signal to the outside.

When the temperature of the heat source is sufficiently high by the abnormal heat source determination means as shown in FIG. 3B, it is determined to be a fire. See also FIG.
When the temperature of the heat source is not sufficiently high as shown in (a), the abnormal heat source position detecting means detects the position and the lens direction setting means 4 adjusts the lens direction of the video camera.

FIG. 4 is a block diagram of an embodiment of the thermal image detecting means 3 in the present invention. 6a to 6e are pyroelectric heat detecting elements, 6 is a pyroelectric heat detecting element group, and 7 is a rotation axis. Figure 4
4A shows the case where the rotation axis 7 is parallel to the pyroelectric heat detection element group 6, and FIG. 4B shows the case where the rotation axis 7 is inclined with respect to the pyroelectric heat detection element group 6 by a constant angle θ. Indicates. The angle θ is selected according to the structure of the main body supporting part 2 incorporated and the setting of the detection viewing angle.

Next, a mechanism for obtaining a thermal image by using the pyroelectric type heat detection element group 6 will be described with reference to FIG. FIG. 5A shows the stereoscopic viewing angle of the thermal image to be detected, and FIG. 5B shows the detected thermal image. The pyroelectric type heat detection element group 6 has five elements, and divides the viewing angle into five in the vertical direction and takes charge.

The pyroelectric heat detecting element group 6 is used in combination with an optical lens. The viewing angle is set narrow in the horizontal direction, and the viewing angle in the horizontal direction is sequentially moved as the rotary shaft 7 rotates. The pyroelectric heat detection element group 6 measures the temperature each time it is sequentially moved, so that a two-dimensional thermal image shown in FIG. 5B can be obtained.

The pyroelectric infrared sensor which is usually used is a so-called bulk type which uses a sintered body of a pyroelectric thick film, but this bulk type has a problem that the thermal time constant cannot be made small and the response is slow. have. Therefore, by using a pyroelectric heat detecting element using a pyroelectric thin film made of PbTiO ₃ or the like, the response time can be made about 1/10 of that of the bulk type.

By using the pyroelectric heat detecting element using the pyroelectric thin film and shortening the response time, the behavior of the intruder can be detected with high accuracy. Furthermore, if a pyroelectric thin film is used, the device can be further downsized.

[0028]

As is apparent from the above description, the present invention has the following advantages.
The thermal image obtained by the pyroelectric type heat detection element group can detect an abnormal state at an early stage, and the position of the abnormal state can be detected, so that an image of an intruder can be taken.

Further, according to the present invention, the thermal image can be detected with a relatively simple structure by rotating the pyroelectric heat detecting element group arranged in one dimension.

Further, by using the pyroelectric type heat detecting element group of the pyroelectric thin film, the response speed of the thermal image can be improved and the size of the apparatus can be reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a disaster prevention detection device according to an embodiment of the present invention.

FIG. 2 is an internal block diagram of the fire protection detection device.

FIG. 3 (a) is an explanatory diagram of the same function. (B) The same explanatory diagram

FIG. 4A is a configuration diagram of an embodiment of the thermal image detecting means. (B) is the same configuration diagram

5A is an explanatory diagram of a mechanism for obtaining a thermal image using a pyroelectric heat detection element group, and FIG. 5B is the same explanatory diagram.

FIG. 6 is a schematic configuration diagram of a conventional fire detection device.

FIG. 7 is a schematic configuration diagram of the intruder detection device (light receiving type).

FIG. 8 is a schematic configuration diagram of the intruder detection device (blocking type).

[Explanation of symbols]

1 video camera 2 Body support 3 Thermal image detection means 4 Lens direction setting means 5 Abnormal signal external output means 6 Pyroelectric heat detection element group 7 rotation axis 8 light emitting elements 9 Light receiving element 10 Visible light blocking filter 11 smoke particles

Claims (7)

[Claims] 1. A disaster prevention detection device having a thermal image detection means, which comprises a plurality of pyroelectric heat detection element groups. 2. A video camera and a video camera supporting portion are connected by a one-dimensional or two-dimensional rotating mechanism, and the thermal image detecting means is fixed to the main body supporting portion and is arranged directly opposite to the detection direction. A disaster prevention detecting device having the thermal image detecting means according to claim 1. 3. A disaster prevention detector having a thermal image detecting means for detecting a fire by the thermal image detecting means. 4. A disaster prevention detector having thermal image detecting means, abnormal heat source position detecting means, and thermal image detecting means for detecting a human body by a heat source position storage device. 5. An abnormal signal external output means is provided.
A disaster prevention detection device having the thermal image detection means according to any one of 1 to 4. 6. A disaster prevention detection device having a thermal image detection means according to claim 1, wherein a pyroelectric thin film is used for the pyroelectric thermal detection element group. 7. A pyroelectric heat detecting element group is arranged one-dimensionally on a linear axis and has a rotation axis parallel to the linear axis or inclined by a constant angle, and the pyroelectric heat detection element group is centered on the rotation axis. The disaster prevention detecting device having a thermal image detecting means according to claim 1, wherein a two-dimensional image is obtained by rotating the electric thermal detecting element group.