JPS59182415A - Remote observing device - Google Patents

Abstract

PURPOSE:To observe distinctly the front in a field of view irrespective of a distance an object without focusing by constituting a titled device of an image guide of an optical fiber, a pin hole optical system and an image observing means. CONSTITUTION:A cap 5 having a pinhole 4 is fitted to a tip incident surface 2 of an image guide 1, and an object of high temperature is projected to the surface 2 by the pinhole 4 of the cap 5 without using a lens. On the other hand, a picture transmitted to a rear end 3 of the guide 1 is formed imagewise on a photoelectric converting surface of an image pickup tube 7 by a lens 6, converted to a video signal, and thereafter, magnified and displayed by a television receiver 8. A field of view to be observed can be changed to both a wide angle and a narrow angle by adjusting an interval (d) between the pinhole 4 of the cap 5 and the surface 2. Also, the light radiated from pig iron of a melted state and molten steel is intense remarkable, therefore, an object of high temperature can be observed sufficiently even by slight light passing through the hole 4.

Description

DETAILED DESCRIPTION OF THE INVENTION Image guides made of optical fibers are relatively flexible and do not adversely affect transmitted images even when bent. It is widely used in various technical fields because it can transmit data with little loss.

However, when sending images via image guide,
An image must be formed on the front end entrance surface of the image guide by the objective lens. Furthermore, when forming an image using an objective lens, it is necessary to focus on the plane of incidence, so a focus adjustment mechanism must be provided or a fixed focal length lens with a deep depth of focus must be used.

Moreover, in order to observe high-temperature objects such as those inside blast furnaces and converters from a remote location, if an optical system consisting of an image guide and an objective lens is adopted, a strong beam of light is focused by the objective lens and directed toward the front entrance surface. The tip of the image guide may be burned out due to the incident light, making it unsuitable for observing high-temperature objects.

Therefore, when observing a high-temperature object, it is necessary to provide an aperture or interpose an ND filter, which poses a problem of complicating the optical system.

Therefore, the present invention was devised to solve such problems, and as shown in FIG. The image of the high temperature object is projected onto the tip entrance surface (2) by the bin pole (4)K of the cap (5) without using a lens.

On the other hand, the image transmitted to the rear end (3) of the image kite (1) is focused on the photoelectric conversion surface of the image pickup tube (7) by the lens (6), converted into a video signal, and then sent to the television receiver. (8) Enlarge and display.

As shown in the sectional view of FIG. 2, the image guide (1) is supported concentrically within the protection pipe (9) by vanes α0). Then, air is sent from the rear of the protection pipe (9) to cool the image kite (1) and the cap (5), and to blow off smoke and dust in front of the cap (5) to secure the field of view.

Note that the field of view to be observed is determined by the pinhole (
By adjusting the distance (dl) between 4) and the tip entrance surface (2), the angle can be changed to a wide angle or a narrow angle.Also, since the light rays radiated from molten pig iron or molten steel are extremely strong, it is difficult to focus Even with a small amount of light passing through the hole (4), a high-temperature target object can be sufficiently observed.

As explained above, according to the observation device of the present invention,
There is no need for focusing, and the screen in the field of view is independent of the distance of the target object (when observed clearly). Since it can be projected over a range, it is impossible to know the distance to the target object.

When measuring the distance to a target object, as shown in Figure 3, an image guide (1) and a pinhole (4) are used.
An optical system consisting of a cap (5) having a
), and the images transmitted to the rear end of each image guide (1) are sent to the image pickup tube (7) by the lens (6).
The image is formed on the photoelectric conversion surface and converted into a video signal.

The two video signals obtained in this way are combined and the screen of the television receiver (8) is divided into upper and lower halves and displayed. That is, the upper half of the image obtained by the left image guide and the lower half of the image obtained by the right image guide are combined and displayed.

Then, electrically or optically shift the upper half image - 11-p' is the lower half image - to the left or right to match the images of the target object, and at that time, the distance to the target object is smaller than the amount of shift. can be determined.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing one embodiment of the remote observation device of the present invention, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIG. 3 is a diagram showing another embodiment of the remote observation device. FIG. 1... Image guide 2... Front entrance surface 3... Rear end 4... Pinhole 5... Cap 6... Lens 7... Image pickup tube 8... Television receiver No. 3 times

Claims (1)

[Scope of Claims] An optical system consisting of an image kite made of optical fiber and a pinhole for projecting an image of a target object onto the front end entrance surface of the image guide; A remote observation device comprising: a means for observing an image; and a means for observing an image.