JPS6211384A - Supervisory equipment for tv camera - Google Patents

Abstract

PURPOSE:To specify an appliance to be supervised and to specify easily its temperature distribution by superposing an infrared picture of the equipment showing its temperature distribution on its visible light picture showing the outline of the appliance. CONSTITUTION:On the optical axis behind the objective lens 1 of the titled equipment, a wave-length-selective type mirror (optical divider) 3 is disposed in an posture inclined by a necessary angle. This mirror 3 selectively reflects the infrared rays R, but the visible light transmits through it, therefore the rays are divided into infrared rays R and visible light rays K. By refracting with a prism 4, the infrared rays R are made incident to an infrared image pickup tube 5 and the visible light rays K to a visible light image pickup tube 6. An infrared picture signal R5 and a visible light picture signal K6 respectively formed in the tubes 5 and 6 are outputted from the TV camera 7, and they are supplied to a picture decoders 9a and 9b respectively via TV cables 8a and 8b and decoded. The infrared picture of the appliance to be monitored showing its temperature distribution is superposed on its visible light picture and displayed on a CRT displayer tube 12 connected to a picture signal processing circuit 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a TV camera monitoring device suitable for industrial plants.
This invention relates to a TV camera monitoring device improved to display CR7.

[Technical blueprint of invention and its problems]

Generally important in industrial plants! ! ! The operating status of a single device is monitored by filming it with a TV camera and displaying it on a CRT display.

In particular, the reactor containment vessel of a nuclear power plant contains a large number of important equipment and piping, and once the plant is in operation, the radiation level becomes high (and the workers inside the reactor containment vessel). It would be difficult to enter.Therefore, conventionally, TV cameras were placed inside the reactor containment vessel to monitor the inside.

However, in the conventional TV camera monitoring device, the TV camera installed in the reactor containment vessel conveyed only images formed using visible light, so that sufficient monitoring information could not necessarily be obtained.

In other words, while operating equipment and piping are distributed at high or low temperatures, monitoring images using visible light alone cannot
It is not possible to understand this temperature distribution. On the other hand, an infrared camera can obtain temperature distribution information of equipment and piping, but there is a problem in that this infrared image alone is significantly different from the visible light image that we are accustomed to, making it difficult to identify the subject. That is, for example, if there is only one hot spot within a certain field of view, the image obtained by photographing this spot with an infrared TV camera will be one bright spot on a dark surface.

For this reason, even if the observer has sufficient prior knowledge about the subject, it is difficult to determine which parts are hot.
Extremely difficult to identify.

Furthermore, if visible light images and infrared images are displayed separately on a CRT display device or the like and monitored side by side, image shifts due to differences in magnification or parallax between the two images may occur, which can be easily corrected. Instead, there was a risk that the configuration etc. would become complicated.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a TV camera monitoring device that displays a visible light image and an infrared image in a superimposed manner on one screen of a display device.

[Summary of the invention]

In order to achieve the above-mentioned object, the present invention provides a TV camera monitoring device that displays an image of a monitored Ml device captured by a TV camera on a display device for monitoring. A TV camera is provided with a light separator that separates visible light and infrared light, and an image pickup tube that captures each image formed by these separated visible and infrared rays, and each image from the image pickup tube of this TV camera. A feature of the present invention is that an image signal processing circuit is provided which receives a signal, superimposes the visible light image and the infrared image, and displays the superimposed image on the display device.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 3.

FIG. 1 shows the configuration of a TV camera incorporated in one embodiment of the present invention, in which a wavelength selective mirror 3 of a light separator is provided on the incident optical axis 2 behind the objective lens 1 and tilted at a required angle. , while selectively reflecting infrared rays R, visible light 1
1K is transmitted and both R and K are separated.

The separated infrared rays R are refracted by the prism 4 and are incident on the infrared imaging tube 5, while the visible rays are incident on the visible ray imaging tube 6. This infrared III &?
! f5 captures an optical image formed by infrared rays R,
The visible light imaging tube 6 captures an optical image formed by the visible light K and outputs the visible light image signal R5 as an electrical signal. . However, since there is a slight difference in the focal length of the objective lens 1 between infrared rays R and visible rays, both image pickup tubes 5 and 6
The magnification is adjusted to be equal at , and this objective lens 1
The focus is automatically adjusted by remote control.

The TV camera 7 (see Fig. 2) configured in this way is
For example, the image signal is connected to image demodulators 9a and 9b via TV cables 8a and 8b, which are arranged in a reactor containment vessel (not shown) of a nuclear couplant, and which transmit the infrared image signal R5, visible light image signal, and 6, respectively. The processing circuit 10 is connected to the processing circuit 10 . The image signal processing circuit 10 is electrically connected to a control console 11 as an input device and a color CRT (color cathode ray tube) 12 as an output device. This control console 11
In response to the image selection operation, the image signal processing circuit 10 switches the infrared image signal R5 and the visible light image signal 6,
Alternatively, the infrared image and the visible light image are displayed on the screen of the color CRT 12 either individually or in a superimposed manner. Furthermore, when both images are superimposed, the visible light image is displayed in monochrome and the infrared image is displayed in color.

Further, the control console 11 remotely controls the focus, aperture, direction, magnification (telephoto), etc. of the objective lens 1 of the TV camera 7, and various control signals for this purpose are not shown.
The signal is transmitted to the TV camera 7 via the At1l signal line.

Therefore, when this embodiment is operated now, the incident light that enters the incident optical axis 2 (see FIG. 1) from the objective lens 1 of the TV camera 7 (see FIG. 2) is converted into an infrared ray by the wavelength selective mirror 3. It is separated into R and visible light. The separated infrared rays R are incident on an infrared imaging tube 5 via a prism 4, while visible light is incident on a visible ray imaging tube 6.

As a result, the infrared image formed by the infrared rays R is captured by the infrared imaging tube 5 and converted into an infrared image signal R5 which is an electrical signal, and the visible light image formed by the visible light K is captured by the infrared imaging tube 5. The electric signal is converted into a visible light image signal 6 by each image demodulator 9a.
, 9b, and are input to the image signal processing circuit 10, respectively. The image signal processing circuit 10 receives an image selection operation from the control console 11, switches or superimposes the infrared image signal R5 and the visible light image signal 6, and separately outputs the infrared image and the visible light image. , or superimpose them and display them on one screen of the color CRT'I 2. When these two images are superimposed and displayed on the color CRT 12, the visible light image is displayed in monochrome and the infrared image is displayed in color.

Therefore, a color infrared image such as red showing the temperature distribution is superimposed on the monochrome visible light $1611 showing the outline of the monitored device and displayed on one screen of the color CRT 12. As a result, the monitored device can be easily identified by the monochrome outline etc. on the screen of the color RT12, and the temperature distribution in the monitored device can be identified from the color.

FIG. 3 shows the configuration of the main parts of another embodiment of the present invention, and the main difference between this embodiment and the above-mentioned embodiments is that an infrared filter 2OR and a visible light filter 20K are used as light separators. The TV camera 7 is equipped with a dual-use image pickup tube 21 that can capture optical images of both infrared rays R and visible light as an image pickup tube.
The point is that it has been incorporated into.

That is, on the incident optical axis 2 behind the objective lens 1 of the TV camera 7, a dual-purpose image pickup tube 21 that separately images both an infrared image and a visible light SLL image is arranged, and this dual-purpose image pickup tube 21 and On the incident optical axis 2 between the objective lens 1 and the objective lens 1, there is an infrared filter 2OR that transmits only infrared rays R and blocks the rest, and visible light l! A visible light filter 20 is removably disposed on the incident optical axis 2, allowing only light to pass therethrough and blocking the rest. Both these filters 2OR, 2
0 are coaxially arranged in front of each other on the incident optical axis 2, and their respective ends are fixed to the axial ends of the output shafts of the respective drive units 22R, 22, and the incident optical axis 2 is It is supported so as to be swingable along the direction perpendicular to the axis. In addition, each drive unit 22R, 22
is driven by receiving drive signals 511R and 811K output from the control console 11 (see Figure 2), and an infrared filter 2OR or visible light filter 20K is inserted on the incident optical axis 2. Drive signal 511R, S11
When the input stops, each filter 20R920K is swung outward from the input optical axis 2 in the direction perpendicular to the axis and pulled out.

Therefore, when an infrared image is superimposed on a visible light image and displayed on the screen of the color CRTI 2 according to this embodiment, a drive signal 811K is sent from the control console 11 to the drive 122.
is output, and only the visible light filter 20 is inserted onto the incident optical axis 2. As a result, a visible light image is captured by the dual-purpose image pickup tube 21, and the outline of the monitored device is displayed in monochrome on the screen of the color CRT 12. Thereafter, the output of the drive signal 811 to the drive section 22 is stopped, and the drive signal 511R is instantaneously inputted to the drive section 22R to perform instantaneous switching. As a result, the infrared filter 2OR is momentarily inserted onto the incident optical axis 2, and at the same time the visible light filter 20K is removed. Therefore, since the infrared image is momentarily displayed on the screen of the color CRT 12 via the dual-use R@ tube 21, etc., the temperature distribution is displayed on the visible light a image showing the outline of the I organ due to the afterimage on the screen of the color CRT 12. The infrared light 118@ shown is displayed in a superimposed manner. This also makes it possible to sufficiently specify the ErflR device and the temperature distribution.

〔Effect of the invention〕

As explained above, the present invention provides a TV that monitors a device by displaying an image of the device to be monitored captured by a TV camera on a display device.
In a camera monitoring device, there is a light separator that separates incident light from an optical lens system into visible light and infrared light, and an imaging tube that captures each image formed by the separated visible light and infrared light, respectively. and an image signal processing circuit that receives each image signal from the image pickup tube of the TV camera, superimposes the visible light image and the infrared image, and displays the superimposed image on the display device.

Therefore, according to the present invention, an infrared image showing the temperature distribution of the monitored equipment is added to the visible light image showing the outline of the monitored equipment.
! ), the device to be monitored can be specified, and the temperature distribution of the device can be easily specified.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a TV camera in an embodiment of the TV camera monitoring device according to the present invention, FIG. 2 is an overall block diagram of the embodiment including the TV camera shown in FIG. 1, and FIG. FIG. 3 is a configuration diagram showing the configuration of a TV camera incorporated in another embodiment of the present invention. 1... Objective lens, 2... Incident optical axis, 3... Wavelength selective mirror (light separator), 4... Prism, 5...
・MS tube for infrared rays, 6...Image tube for visible light, 7...
・TV camera, 10... Image signal processing circuit, 12...
- Color CRT display device (display device), 2OR... infrared filter (light separator), 20K... visible light filter (light separator).

Claims (1)

[Scope of Claims] 1. In a TV camera monitoring device that monitors by displaying an image of a monitored device captured by a TV camera on a display device,
A TV camera is equipped with a light separator that separates incident light from an optical lens system into visible light and infrared light, and an image pickup tube that images each image formed by these separated visible light and infrared light, respectively. A TV camera monitoring device comprising: an image signal processing circuit which receives each image signal from an image tube of the TV camera, superimposes the visible light image and the infrared image, and displays the superimposed image on the display device. . 2. The TV camera monitoring device according to claim 1, wherein the optical separator is a wavelength selective mirror that transmits visible light and reflects infrared rays. 3. Claim 1, wherein the optical separator is an optical filter that is removably inserted into the optical path of incident light to a broadband sensitive image pickup tube that captures both optical images of visible light and infrared light. The TV camera monitoring device described in 2.