JPH052177B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a remote temperature detection device, and is particularly suitable as a visual detector for a remote temperature monitoring system that remotely monitors temperature while making temperature distribution correspond to visual information. The present invention relates to a remote temperature detection device.

[Background of the invention]

Conventional remote temperature detection devices have been portable devices that allow you to view the object to be monitored directly through the viewfinder while simultaneously viewing the temperature distribution, but this requires a person to carry it to the object to observe it. Therefore, it is not suitable for a system that remotely monitors temperature while responding to visual information of the monitored object. On the other hand, when monitoring abnormalities in heat generation in equipment such as nuclear facilities, a system that can remotely monitor is required for the purpose of reducing radiation exposure.

From this perspective, the inventor of the present invention is proceeding with research on a system that can remotely monitor the temperature while corresponding to visual information of the object to be monitored. FIG. 10 is a configuration diagram of a remote temperature monitoring system currently under consideration. Remote temperature detection device 20
0 is mounted on a pan/tilt scanning mechanism 201 for changing its direction, and is installed near the object to be monitored. Monitor 202 separate from visual device 200
and an operating device 203 are installed, and the detection device 200
and is connected by a signal transmission cable 204. The monitor 202 is a system that can display or monitor visual information and temperature information of the object to be monitored while making them correspond to each other.

In order to monitor heat generation abnormalities in equipment inside buildings such as nuclear facilities, it is necessary to place a visual detector with a wide viewing angle relatively close to the object to be monitored, and to monitor the detailed temperature distribution of the object to be monitored. . In this case, in order to accurately display and monitor the location and temperature of the device being monitored, the temperature measurement information needs to correspond to the visual information from the television camera with high positional accuracy.

In addition, as a publicly known example of this kind, May 24, 1985
There is an article about an infrared TV camera in the Nippon Kogyo Shimbun, but there is no mention of its specific configuration.

[Purpose of the invention]

The purpose of the present invention is to eliminate the misalignment between the optical axis of visible light scanned by a television camera and the optical axis of infrared rays scanned by an infrared scanning mechanism, and to correspond to the visible image of the television camera in two dimensions with high positional accuracy. The object of the present invention is to obtain a remote temperature detection device that can easily obtain temperature information.

[Summary of the invention]

In order to achieve the above object, the present invention provides a half mirror that transmits visible light and infrared rays obtained from an object to be monitored and reflects the infrared rays in a desired direction; A television camera equipped with a wide-angle lens that converts light beams into electrical signals and an infrared scanning mechanism scan the infrared rays reflected by the half mirror, and then the infrared rays transmitted through an infrared condenser lens and a chopper are used as temperature information. In the remote temperature detection device, the infrared scanning mechanism includes an infrared scanning mirror that reflects the infrared rays, and a first drive mechanism that rotationally drives the infrared scanning mirror. and a second drive mechanism that rotates the infrared scanning mirror and the first drive mechanism integrally, the center of the rotation axis of the first drive mechanism and the rotation of the second drive mechanism. In addition to being configured so that the axis center is perpendicular to the
The perpendicular point is the scanning center point of the infrared scanning mechanism, and the visible light beam travels from the object to be monitored to the center point of the lens of the television camera via the half mirror. ,
The television camera and the infrared detector are respectively arranged at positions where the distance from the object to be monitored to the scanning center point of the infrared scanning mechanism of the infrared detector is equal to the distance from the infrared ray to the half mirror. This is what I did.

In other words, the infrared scanning mechanism includes one infrared scanning mirror and a first infrared scanning mirror that rotationally drives the infrared scanning mirror.
and a second drive mechanism that rotationally drives the infrared scanning mirror and the first drive mechanism, so that infrared rays can be scanned in two dimensions.

Also, the distance that visible light travels from the object to be monitored via the half mirror to the center of the lens of the TV camera, and the distance that infrared rays travel from the object to the monitor via the half mirror to the scanning center of the infrared scanning mechanism of the infrared detector. The distance to the point is always the same no matter which point on the object to be monitored is being scanned, so the optical axis of the visible light scanned by the television camera and the infrared scanning mechanism are Since the optical axis of the infrared rays is located on the same axis, it is possible to easily obtain temperature information that corresponds to the visible image of the television camera with high positional accuracy.

[Embodiments of the invention]

The following embodiments of the invention are shown in Figures 1, 2 and 3.
This will be explained using figures. This embodiment shows a remote temperature sensing device using a single infrared detector and providing a two-dimensional infrared scanning mechanism. Each figure is a cross-sectional view of the case 60 of the temperature detection device, clearly showing the internal structure of the device.

A glass window 4 is provided on the front surface of the temperature detection device to let in visible light and infrared rays to prevent dust from entering the visual device, rubber feet 54 are provided on the bottom surface, and a handle 55 for carrying is provided on the top surface. has been established.

Visible light and infrared light entering through window 4 are split into visible light and infrared light by half mirror 5.
In this embodiment, visible light passes through the half mirror 5 and enters the television camera 12 installed after the half mirror 5. The television camera 12 is equipped with a wide-angle lens 11. Also, TV camera 1
2 is fixed to a camera stand 62 that is integrated with a case 60. The half mirror 5 is also fixed to a mirror stand 61 integrated with the case 60. On the other hand, the infrared rays reflected by the half mirror 5 are reflected by the infrared scanning mirror 6, are condensed by the infrared condensing lens 7, and enter the infrared detector 9 through the chopper 8. The infrared detector 9 is fixed to a detector stand 63 that is integrated with the case 60. The chopper 8 is rotated by a chopper motor 10. The infrared condensing lens 7 and the chopper motor 10 are also fixed to the case 60.

Here, the rotational center axis of the stepping motor 20 and the rotational center axis of the stepping motor 30 are orthogonal to each other, and the intersection point is the center of the infrared reflection point of the infrared scanning mirror 6.

In other words, the scanning center point d of the infrared rays shown in FIG.
is the reflection center of the infrared rays of the infrared scanning mirror 6.

As described above, in the embodiment of the present invention shown in FIGS. 1 to 3, infrared rays from the object to be monitored pass through the window 4, are reflected by the half mirror 5, and reach the infrared scanning center point d. The television camera 12 is set so that the distance through which the visible light passes from the object to be monitored through the window 4, the half mirror 5, and the visible light scanning center point c is equal. and infrared scanning mirror 6 of the infrared detector
By adjusting the mounting position, the optical axis for visible light scanning and the optical axis for infrared scanning can always be positioned on the same axis when the scanning angle is the same.

In this embodiment, the rear surface of the case 60 is provided with connectors 51 to 53 for inputting and outputting signals between the remote temperature detection device and external equipment. The connector 51 is connected to the connector 5 for outputting the video signal of the television camera.
2 for outputting temperature information from the infrared detector, and connector 53 for inputting motor control signals.

Figure 4 shows the distance traveled by visible rays from the object to be monitored to the scanning center point of the visible rays that pass through the half mirror and enter the television camera (the first principal point of the optical system lens of the television camera). The distance traveled by the infrared rays from the object being monitored to the scanning center point of the infrared rays reflected by the half mirror and entering the infrared detector is always the same no matter which point on the object to be monitored is being scanned. The principle of the above embodiment in which a television camera and an infrared detector (infrared scanning mirror) are arranged will be explained with reference to FIG. In the present invention, the optical system lens 10 of the television camera passes from one point a of the monitoring object 100 to the point b of the half mirror 5.
1 and the distance (+) from point a of the monitored object 100 to point b of the half mirror 5.
The distance (+) to the scanning center point d of the infrared scanning mechanism is made equal to the distance (+) reflected by the infrared ray scanning mechanism. The visible light is converted into a video signal at the imaging surface 102 of the television camera. The infrared scanning mechanism shown in FIG.
This is an example of an infrared scanning mechanism with a simple configuration, and uses a two-dimensional array infrared detector 104. In this case, the scanning center point of the infrared scanning mechanism is
This is the first principal point d of the infrared lens 103 made of a material such as Ge. By using the two-dimensional array infrared detector 104, two-dimensional scanning of infrared rays can be performed by an electronic circuit similar to a television camera using a solid-state image sensor.

FIG. 5 shows a principle diagram of an embodiment in which the infrared scanning mechanism using an infrared array detector in FIG. 4 is replaced with an infrared scanning mechanism using an infrared scanning mirror. The infrared rays reflected by the infrared scanning mirror 6 pass through an infrared condenser lens 7 and enter an infrared detector 9. The infrared scanning mirror is driven by an infrared scanning mirror drive mechanism 105,
Infrared light is scanned mechanically. In this case, the center of the point where the infrared rays are reflected by the infrared scanning mirror 6 becomes the infrared scanning center point d. In the embodiment of FIG. 5 as well, the distance (+) from a point a of the monitored object 100 to the first principal point of the optical system lens 101 of the television camera through the point b of the half mirror 5;
The distance (+) from one point a of the monitored object 100 to the scanning center point d of the infrared scanning mirror 6 after being reflected at the point b of the half mirror 5 is configured to be equal.

In the configurations shown in FIGS. 4 and 5, the scanning angle at which the television camera scans the visible light from one point a on the monitored object 100 is θ, and similarly the infrared rays from one point a on the monitored object 100 The scanning angle at which the infrared scanning mechanism scans is also θ. That is, when the scanning angle of the television camera and the scanning angle of the infrared scanning mechanism are the same angle, visible light and infrared rays from the same point on the monitored object 100 can be respectively detected, so that the visible image of the television camera It is possible to easily obtain temperature information that corresponds to high positional accuracy.

FIG. 6 is a diagram explaining the principle when the position of the television camera in FIG. 4 is slightly shifted. In FIG. 6, since ( ₁ + ₁ ) > ( ₂ + ₂ ), the scanning angle θ ₁ of the television camera and the scanning angle of the infrared scanning mechanism when scanning the same point a of the monitored object 100 are In order to find the scanning angle θ ₂ for scanning point a of the monitored object 100, which is not equal to θ ₂ and is the same as the scanning angle θ ₁ , the distance from the monitored object to the temperature detection visual device is used as a variable. This requires complex calculations including:

A two-dimensional scanning type temperature detection device that combines a one-dimensional array infrared detector 90 and an infrared scanning mirror 6 for one-dimensional scanning as shown in FIG. 7, or a two-dimensional array infrared sensor as shown in FIG. In a temperature detection device using a detector or a one-dimensional scanning type temperature detection device, that is, in a two-dimensional infrared scanning mechanism using a single infrared detector,
As shown in one embodiment of FIGS. 1 to 3, horizontal and vertical two-dimensional scanning is performed using a single infrared scanning mirror 6.
By doing this, it is possible to easily set the distance from both the horizontal and vertical infrared scanning center point d to the object to be monitored to be equal to the distance from the scanning center c of the television camera to the object to be monitored.

FIG. 8 shows an explanatory diagram of the principle when horizontal and vertical two-dimensional scanning is performed using two mirrors. 8th
In the figure, infrared rays entering an infrared detector 9 are reflected by an infrared scanning mirror 6 and then enter the infrared rays. The infrared scanning mirror 6 is controlled in horizontal scanning by a stepping motor 20 for horizontal scanning. In addition, the infrared rays entering the infrared scanning mirror 6 are
It is reflected by half mirror 5 and comes in. The half mirror 5 is vertically scanned by a stepping motor 30 for vertical scanning. When horizontal and vertical two-dimensional scanning is performed using two mirrors in this way, the scanning center point d ₂ of the horizontal scanning is located on the infrared scanning mirror 6, and the scanning center point d ₁ of the vertical scanning is located on the half mirror 5. be. In other words, since the horizontal and vertical scanning center points are not the same point, the distance from the object to be monitored to the scanning center point _d2 of horizontal infrared scanning was set equal to the distance from the object to be monitored to the scanning center point of the television camera. In this case, the horizontal scanning angle of the infrared rays can be controlled using the same scanning angle as the scanning angle of the television camera, but the vertical scanning angle of the infrared rays requires complicated calculations similar to what was explained in the principle diagram of Fig. 6 above. I become confused.

In contrast, in the embodiment of the present invention described in FIGS. 1 to 3, one infrared mirror 6 is rotated by the stepping motor 20, and the stepping motor 30 is connected to the stepping motor 20 and the infrared rays. By rotating the scanning mirror 6 in unison and configuring the rotation axes of the motors to be perpendicular to each other, two-dimensional horizontal scanning and vertical scanning can be controlled by separate motors. Infrared scanning control can be easily performed.

Further, in the embodiment of the present invention described in FIGS. 1 to 3, the stepping motor 30 has a rotating shaft of the motor that is reflected by the infrared scanning mirror 6 and is directed toward the infrared detector 9. Since the stepping motor 30 is arranged coaxially with the axis, it is only necessary to rotate the stepping motor 30 by the same angle as the scanning angle, and scanning control can be easily performed.

FIG. 9 is a diagram illustrating the principle of only the relationship between the stepping motor 30 and the infrared scanning mirror 6 of the temperature detection device according to the embodiment of the present invention described in FIGS. 1 to 3. The rotation angle θ of the stepping motor 30 may be the same as the scanning angle θ of the infrared rays, and the scanning control of the stepping motor 30 can be easily performed. However, in order to make the stepping motor 20 correspond to the visible image of the television camera with high positional accuracy, it is necessary to perform some correction calculation according to the scanning angle θ of the stepping motor 30.

〔Effect of the invention〕

As explained above, according to the present invention, the optical axis of visible light scanned by a television and the optical axis of infrared rays scanned by an infrared scanning mechanism are eliminated, and the visible light of a television camera is Since temperature distributions can be made to correspond in dimension, it is possible to obtain a remote temperature detection device that can easily obtain temperature information that is made to correspond with high positional accuracy.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the device of the present invention;
Fig. 2 is a front view of Fig. 1, Fig. 3 is a plan view of Fig. 1, Figs. 4 to 6 are diagrams explaining the principle of the present invention, and Fig. 7 shows a one-dimensional array infrared detector. Basic configuration diagram of another embodiment of the present invention when used, No. 8
The figure is an explanatory diagram of the main parts showing an example in which two-dimensional infrared scanning is performed using two mirrors, and Figure 9 is an explanatory diagram of the main parts of an embodiment in which two-dimensional infrared scanning is performed using two mirrors.
FIG. 3 is a principle explanatory diagram illustrating the configuration and principle of the stepping motor portion shown in FIG. 3, and FIG. 10 is a configuration diagram of the entire remote temperature monitoring system. 4... Window, 5... Half mirror, 6... Infrared scanning mirror, 12... Television camera, 9... Infrared detector, 20... Stepping motor, 30...
...Stepping motor.

Claims (1)

[Scope of Claims] 1. A half mirror that transmits visible light and infrared rays obtained from an object to be monitored and reflects the infrared rays in a desired direction, and converts the visible light that has passed through the half mirror into an electrical signal. a television camera equipped with a wide-angle lens that converts the infrared rays into temperature information; and an infrared ray that scans the infrared rays reflected by the half mirror with an infrared scanning mechanism, and then converts the infrared rays transmitted through an infrared condensing lens and a tipper into temperature information. In a remote temperature detection device comprising: a detector, the infrared scanning mechanism includes a
It is composed of two infrared scanning mirrors, a first drive mechanism that rotationally drives the infrared scanning mirror, and a second drive mechanism that rotationally drives the infrared scanning mirror and the first drive mechanism integrally. , the center of the rotation axis of the first drive mechanism and the center of the rotation axis of the second drive mechanism are configured to be perpendicular to each other, and the point of the orthogonal alignment is a scanning center point of the infrared scanning mechanism; , the distance from which the visible light rays travel from the object to be monitored to the center point of the lens of the television camera via the half mirror; A remote temperature detection device characterized in that the television camera and the infrared detector are respectively arranged at positions where the distances from the camera to the scanning center point of the infrared scanning mechanism are equal to each other.