JPH0618426A - Cylinder inner wall photographing unit - Google Patents

Abstract

PURPOSE:To photograph inner wall of a cylinder such as a tunnel or the like simply as well as to make a development elevation of the inner wall reproduceable in an easy manner. CONSTITUTION:In this photographing unit 12, an output light out of an illuminating part 13 scans a tunnel inner wall 8 via a half mirror 5 and a rotary mirror 6. A reflected light out of the inner wall 8 is received by a light receiving part 14 set up at a light transmitting side of the half mirror 5 via the rotary mirror 6. An encoder 9 is installed in a motor 7 of the rotary mirror, outputting a synchronous signal with rotation of the rotary mirror 6. This synchronous signal is recorded into a recording means together with an output signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photographing device for inspecting an inner wall of a tubular body such as a tunnel or a sewer pipe.

[0002]

2. Description of the Related Art In order to understand the state of deterioration such as cracks and water leaks appearing on the wall surface of tunnels, a deformation inspection of tunnel shoes is regularly performed. Currently, this inspection is carried out visually by workers on foot in the tunnel, but it is difficult to see because it is dark inside the tunnel, and it is not possible to obtain a sufficient visual range.
It was inefficient because there was a problem that there was not enough time and it was dangerous because it was done using trains between trains.

For this reason, an apparatus has been developed which uses a slit camera to take a series of photographs while running a tunnel underwear and evaluates the deterioration state on a film, but it is complicated and expensive. There's a problem. Also, a device has been developed that divides the inner wall of the tunnel in the circumferential direction, but when joining the filmed films, there are few marks at the joints, and the joints are made with a straight concrete joint as a guide. Therefore, there is a problem that the work is troublesome.

[0004]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention is capable of taking an image of the inner wall of a cylinder in a short time so that a developed view can be easily obtained without performing a joining operation. With the goal.

[0005]

A first means of the present invention for solving the above-mentioned problems is an apparatus for photographing an inner wall while moving inside a cylindrical body, and is an illumination means and an output of the illumination means. Scanning means for scanning light in the circumferential direction of the inner wall of the cylinder;
A synchronizing signal generating means for outputting a synchronizing signal in accordance with the rotation of the scanning means, a light receiving means for receiving the reflected light from the inner wall of the cylinder, and a storage means for storing the light receiving means and the output of the synchronizing signal. It is characterized by that. A second means of the present invention is to provide a half mirror for reflecting the output light of the illumination means in the direction of the scanning means, and to arrange the light receiving means on the light transmitting side of the half mirror. Characterize. According to a third means of the present invention, the scanning means is a rotary mirror, and the synchronizing signal generating means is a rotary motor of the rotary mirror.
It is characterized in that the synchronizing signal is output at a constant interval in conjunction with the counter.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below by taking a tunnel inner wall photographing device as an example. FIG. 2 is a schematic perspective view showing a tunnel photographing situation. Reference numeral 10 is a tunnel and reference numeral 11
Shows a dolly equipped with a tunnel inner wall imaging device.

The trolley | bogie 11 is the tunnel 1 by the wheel 11a.
It runs in 0 in a lengthwise direction by a self-propelled type or a towed type, and when a track is laid in the tunnel 10, it runs on the track. The configuration of the carriage 11 is arbitrary, but here, the inclined portion 11 is provided in the installation portion of the scanning portion 15 described later.
b is formed so that the reflected light of the rotating mirror is projected to the lower side surface of the inner wall of the tunnel.

A photographing device 12 for photographing the inner wall of the tunnel is mounted on the upper surface of the carriage 11. The photographing device 12 is roughly composed of an illumination unit 13, a light receiving unit 14, a scanning unit 15, and a half mirror unit 5.

FIG. 1 is a schematic configuration diagram of the above-described photographing device 12, the illumination unit 13 includes a light source 1 and a condenser lens 2, and the light receiving unit 14 includes a light receiving element 4 and a condenser lens 3. . In this embodiment, the light receiving portion 14 is arranged on the light transmitting side of the half mirror portion 5, and the illuminating portion 13 is arranged above the half mirror portion 5. The scanning unit 15 also includes a rotating mirror 6 tilted at a predetermined angle, a motor 7 and an encoder 9.

The illumination light from the light source 1 is condensed by the condenser lens 2 and reflected in the direction of the rotating mirror 6 through the half mirror 5. The rotary mirror 6 is rotated at a predetermined speed by the motor 7, and the output light from the illumination unit 13 is projected while being scanned in the circumferential direction of the tunnel inner wall 8 by the rotary mirror 6.
In this case, since the carriage 11 is moving in the length direction of the tunnel 11, the reflected light of the rotating mirror 6 spirally scans the inner wall 8 of the tunnel. A synchronizing signal is output from the encoder 9 at regular intervals in association with the rotation of the motor 7.

The reflected light from the inner wall 10 of the tunnel passes through the half mirror section 5 through the rotary mirror 6 and the amount of light is detected by the light receiving element 4. The output signal of the light receiving element 4 and the synchronizing signal from the encoder 9 are both recorded on a recording means such as a magnetic disk.

FIG. 3 is a block diagram of an electric circuit, in which the output of the light receiving element 4 and the synchronizing signal from the encoder 9 are superimposed, amplified by the amplifier circuit 16, and then recorded in the recording means 17. The encoder 9 interlocks with the rotary mirror 6 and outputs a synchronizing signal when the rotary mirror 6 faces downward. The rotation control circuit 18 controls the rotation of the rotation mirror motor 7 so that the synchronization signal is output at a constant interval. FIG. 4 is a waveform diagram showing an example of the recording signal. The synchronization signal to the next synchronization signal corresponds to one rotation of the rotation mirror 6, and the rotation control circuit described above is arranged so that these synchronization signals have a constant interval. At 18, the rotary mirror motor 7 is controlled to rotate.

The recording signal of the recording means 17 is reproduced as a developed view by the recording / reproducing device when necessary. That is, as shown in FIG. 5, the recording signal is reproduced as brightness corresponding to the output while sweeping with time, is restored by the synchronizing signal, and is moved by a predetermined amount at a right angle to the sweeping direction, thereby exposing the exposure apparatus and the C
It can be reproduced on display means such as RT.

The above-described configurations of the image pickup device, the carriage, etc. are shown as examples for explaining the present invention, and can be arbitrarily changed in accordance with the spirit of the present invention. For example, the light receiving element may be an image pickup element such as a CCD. Further, in the above-described embodiment, the case where the inside wall of the tunnel is photographed is taken as an example, but the apparatus can be miniaturized to be used for photographing the inside of a sewer pipe, a water pipe, various tanks and the like.

[0015]

According to the present invention described above, when the inner wall of the cylinder is photographed, the inner wall of the cylinder can be photographed in a short time, and a developed view can be easily obtained without performing a joining operation. .

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a barrel inner wall imaging apparatus showing a present embodiment of the present invention.

FIG. 2 is a schematic perspective view of a situation of photographing in a tunnel by the photographing device for a wall inside a cylinder showing an embodiment of the present invention.

FIG. 3 is a block diagram of an electric circuit of the in-cylinder wall imaging device showing the present embodiment of the present invention.

FIG. 4 is a waveform diagram of a recording signal showing an embodiment of the present invention.

FIG. 5 is a schematic diagram for explaining a reproduction situation of a recording signal showing an embodiment of the present invention.

[Explanation of sign]

 DESCRIPTION OF SYMBOLS 1 light source 2 condensing lens 3 condensing lens 4 light receiving element 5 haar miller 6 rotating mirror 7 rotating mirror motor 8 inner wall 9 encoder 10 tunnel 11 bogie 11a wheel 11b tilting part 12 imaging device 13 Illumination unit 14 Light receiving unit 15 Scanning unit 16 Amplifying circuit 17 Recording means 18 Rotation control circuit

Claims (3)

[Claims] 1. An apparatus for photographing an inner wall while moving inside a cylinder, comprising: illuminating means, scanning means for scanning output light of the illuminating means in a circumferential direction of the inner wall of the cylinder, and the scanning means. A synchronization signal generating means for outputting a synchronization signal in accordance with the rotation of the, a light receiving means for receiving the reflected light from the inner wall of the cylinder, and a storage means for storing the light receiving means and the output of the synchronization signal. A characteristic imaging device for the inner wall of the cylinder. 2. A light emitting device is provided with a half mirror for reflecting the output light of the illumination means toward the scanning means, and the light receiving means is arranged on the light transmitting side of the half mirror. Item 1. The cylindrical body wall imaging device according to Item 1. 3. The scanning means is a rotating mirror, and the synchronizing signal generating means outputs the synchronizing signal at a constant interval in conjunction with the rotating motor of the rotating mirror. The cylindrical body wall imaging device according to claim 1 or 2.