JPH03100613A - Parallax image photographing device for entire bore hole wall - Google Patents

Abstract

PURPOSE:To observe an image as the one with depth in geological survey by generating a parallax image by synchronizing a stored image with an image on the other side and displaying on the same display screen or two screens simultaneously or alternately. CONSTITUTION:An inside optical fiber 11a takes the charge of an upper image out of the image bisected into upper and lower images of a developed image, and an outside optical fiber 11b takes the charge of the lower image. When a probe 5 is ascended or lowered at constant speed, the inside optical fiber 11a and the outside optical fiber 11b transmit the images at different parts in upper and lower directions at a certain moment, and after the lapse of prescribed time, the optical fiber on one side transmits the same image as the one transmitted by the optical fiber on the other side by capturing the image from another different angle. At such a case, the parallax image can be generated by storing either two developed images and synchronizing the stored image with the image on the other side. In such a manner, since information with respect to depth can be obtained from the parallax image, the device can be used in the geological survey, and a large amount of information can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a polling hole wall photographing device used for geological survey of a construction site, for example, when constructing a deep subway or a skyscraper.

(Prior art) In order to excavate an underground cavity during construction work such as a deep subway, dam, or tunnel, it is necessary to investigate the geology of the construction site. It is necessary to know the slope and properties, as well as the orientation, slope, and properties of the strata.

In traditional geological survey methods, cores of bedrock and strata were collected by polling, but cores cannot be used to identify cracks in the bedrock or the direction of strata, and geological areas with a lot of groundwater cannot be detected. However, in some cases, the core may fall down and cannot be collected at all.

Therefore, in recent years, this traditional geological survey method has been replaced by
A technique has been adopted in which a sonde equipped with a photographing device is suspended in a borehole formed by poling, and the inner peripheral wall of the hole is directly photographed or observed.

These technologies include sondes equipped with a television camera as a photographing device and those equipped with a fiberscope as a photographing device (Japanese Patent Publication No. 60-54647), which allow the inner circumferential wall of the hole to be That is, a developed image of the hole wall is created.

In addition, in order to simultaneously photograph the entire circumference of the hole wall, a conical mirror is used to project an image of the entire circumferential surface of the hole wall onto one conical mirror, and this image is photographed with a television camera installed in the axial direction of the conical mirror (in practical use). (No. 1983-74610) is also available.

(Problem to be solved by the invention) However, with the technique of photographing the entire circumference of the hole wall using the conical mirror, the depth of the image is insufficient, such as the size of the unevenness of the hole wall and the depth of cracks in the rock. No information was obtained 0
For example, it was not immediately possible to know how deep the cracks in the bedrock that appeared in the image were, and the only information that could be obtained was a two-dimensional image.

SUMMARY OF THE INVENTION An object of the present invention is to obtain a borehole wall full-circumference parallax imaging device that can simultaneously image the entire circumference of a borehole wall and create an image with viewing parallax, thereby providing information regarding depth.

(Means for Solving the Problems) The configuration of the present invention will be explained with reference to FIGS. 1 and 2. Note that the following symbols are for explanation and do not limit the scope of the claims in any way.

The present invention includes a lifting device 3 installed on the ground, and a borehole l suspended by the lifting device 3 via a cable 4.
A sonde 5 that moves up and down inside the sonde 5, a light projection device 7 that projects light from inside the sonde 5 onto the entire circumference of the borehole 1 wall, and a conical mirror that reflects the reflected light from the entire circumference of the borehole 1 wall upward inside the sonde 5. 9b, and two sets of optical fibers lla whose starting ends are arranged twice inside and outside on the circumference of the same center as the conical mirror above the conical mirror 9b to receive the reflected light and guide it to the ground together with the cable 4. , llb, a photoelectric conversion means 12 for receiving the reflected light propagated by the optical fiber 11 and outputting image data, and a developed image creating means for processing the image data to form a developed image of each set of optical fibers. 14, a storage means for storing at least one of these developed images, and the stored image and the other image are synchronized and combined on the same screen, or alternately displayed, or displayed simultaneously on two screens. This is a borehole wall all-around parallax image photographing device comprising: a parallax image creating means 19 for creating a parallax image using a parallax image generating means 19;

(Operation) One of the two expanded images is stored, and the stored image and the other image are synchronized to create a parallax image. In addition, remember both the two developed images.

These may be reproduced to create parallax images.

To observe this parallax image as an image with depth,
You can view separate images with each eye; for example, you can alternately display one image on the same screen with one image blue and the other red, or display each image simultaneously on two screens. , the observer wears glasses with blue and red filters on his right and left eyes, respectively.

Furthermore, one of the two images is printed as a blue screen and the other as a red screen on the same paper, and this printed image is observed through the aforementioned glasses with the blue filter and the red filter.

In this way, information regarding depth can be obtained from parallax images, so the device can provide more information as a borehole wall photographing device used in geological surveys.

(Example) An embodiment of the present invention will be described with reference to FIGS. 1 to 5.

The IF diagram is a vertical cross-sectional view showing the main parts of the sonde suspended in the borehole. FIG. 2 is a schematic diagram of the entire apparatus with the sonde of FIG. FIG. 3 is a diagram showing the terminal end of the optical fiber of FIG. 1. FIG. 4 is a diagram showing the hole wall (borehole wall) reflected in the conical mirror of FIG. 1. FIG. 5(A) is a diagram showing a developed image of FIG. 4.

FIG. 5(B) is a developed view showing an image when the sonde is further lowered with respect to the image of FIG. 5(A).

On the ground 2 where a borehole l was formed by poling,
A lifting device 3 is installed. The sonde 5 is suspended by the lifting device 3 via the cable 4. Lifting device 3
works, the sonde 5 moves through the borehole l at a constant speed.
You can go up and down inside.

As shown in FIG. 1, a full-perimeter window 6 is provided at the tip of the sonde 5. Further, an illumination lamp 7a is provided inside the sonde 5,
The light from the illumination lamp 7a is collected by a condenser lens 8,
It is reflected by a special conical mirror 9 and illuminates the entire circumference of the borehole l wall in a ring shape. Illumination lamp 7a and cone
The mirror 9 is a light projecting device 7 that projects light onto the entire circumference of the borehole wall.
It consists of

The conical mirror 9 has a shape in which two cones, upper and lower, are combined. The lower conical mirror 9a has a concave cross-section, which allows the light from the lamp 7a to be focused without being diffused.
The borehole wall is illuminated in a ring shape. Further, the illumination light is reflected from the entire circumferential surface of the borehole wall onto the upper conical mirror 9b, and is collected by the upper focusing lens lO. This focusing lens 10 provides a clear image of the borehole wall surface to an optical fiber 11 provided above.

This optical fiber 11 is made up of a large number of optical fibers bundled together and has a neatly polished end face.As will be described later, the inner optical fiber 11 is connected to the upper part of the developed image divided into upper and lower parts. The outer optical fiber llb, which carries the image, carries the other lower image.

When the sonde 5 descends or ascends at a constant speed, at a certain moment, the inner optical fiber lla and the outer optical fiber llb transmit images at different positions in the vertical direction, and after a predetermined period of time, one of the One optical fiber will transmit the same image that the other optical fiber was transmitting, but from a different angle. This angle becomes the visual disparity.

The reflected light from the borehole wall propagated by the optical fiber 11 is converted into electrical image data by a photoelectric conversion device 12 shown in FIG. This image data is sent to the expanded image processing device 14 via the central control device 13.

In this developed image processing device 14, an image of the entire circumference of the borehole wall as shown in FIG. 4 is processed into a developed image as shown in FIG. 5(A).

An image diagram of this image development processing function is shown in FIG.
The bundle of 1b is expanded without disturbing the arrangement order on the circumference on the terminal side, and is rearranged on a straight line to form 1 conical mirror 9b.
Each pixel (one optical fiber corresponds to one pixel) that makes up the circular image reflected on the side of the hole is rearranged on a straight line to create an expanded image of the hole wall.

Photoelectric conversion element groups 12A and 12B are arranged at the terminal ends of the optical fibers 11a and 11b.

This expanded image is divided into upper and lower halves, and at least one is stored in the expanded image storage device 15. For example, as shown in FIG. 5(A), it is divided into an upper expanded image 16A and a lower expanded image 17A, When photographing while the sonde 5 is descending at a constant speed, the downward developed image 17A is
Only one screen shown in is memorized.

This stored image is synthesized in synchronization with the upward development image 18B when the image changes by one screen as the sonde 5 descends for a predetermined period of time (FIG. 5(B)). This synchronization and composition is performed by the composition device 19, and the stored image (17A) is made into a blue image, and the other image (16B) is made into a red image, and these are synthesized on the same screen.

This combined screen is displayed on one combined image display device 20. The observer observes by wearing glasses with a blue filter and a red filter attached to the right and left eyes, respectively.

The two combined images are taken into the starting end of the optical fiberscope from different angles, forming a so-called parallax image, which provides depth information. Therefore, for example, when a crack exists on the wall surface of a borehole, the depth of the crack can also be observed. Note that this composite image is recorded by the recording device 21 as a blue and red composite image. By observing this recorded composite image later by wearing the glasses, it is also possible to slowly examine similar information regarding depth later.

Incidentally, as shown in FIG. 4, the image of the borehole wall reflected on the conical mirror 9b is directly observed on the video monitor 22. Further, the depth of the sonde 5 is measured by a depth sensor 23.

In the above embodiment, the conical mirror 9a used in the light projecting device shares a common bottom surface with another conical mirror 9b that reflects the reflected light from the borehole wall upward, and is provided integrally with the conical mirror 9a. In other embodiments, the light source of the floodlighting device is the illumination lamp 7a, but in other embodiments, the light is guided from the ground through another optical fiber. Good too.

In the above embodiments, the stored image and the other image are alternately displayed on the same screen, but in other embodiments, the stored image and the other image are alternately displayed on the same screen. It is also possible to display the If you use glasses that open the left and right sides of this screen alternately, like a liquid crystal shutter, and view one image with your left eye and the other image with your right eye, you will be able to observe images with depth. I can do it. In this case, there is no need for the images to be blue and red screens as in the previous embodiment.

In the above embodiments, an optical fiber was used as a means for capturing two images with parallax.

However, in other embodiments, as shown in FIG.
The image is photographed by a television camera 30 through a lens 10. The image taken by the television camera 30 shows the wall surface as a concentric pattern. At this time, an image with parallax is created by using only the concentric images of the portions in focus of the television camera 30 and the lens 10. Since the positional relationship between the television camera 30 and the conical mirror 9 is always the same, by dividing the image corresponding to a predetermined pixel of the television camera into two, it is possible to obtain a parallax image as in the previous embodiment. .

Further, as shown in FIG. 7, in an embodiment having an image sensor A provided at the center of the rotating body 32 and an image sensor B provided at the end, the light from the lamp 7 is transmitted by the lower surface of the scanner mirror 34. The reflected light illuminates the wall surface, and the reflected light is reflected by the upper surface of the scanner mirror 34 and taken into the two image sensors A and B through the lens IO. At this time, the scanner mirror 34 is rotating so that it can scan the entire circumference of the wall surface 1, and in synchronization with this rotation, the image sensors A and B
The rotating body 32 having a rotating body 32 is also rotating.By synchronizing the rotations of both, an image of the entire circumference of the wall surface is captured as an image with parallax.

Furthermore, as shown in FIG. 8, a special prism 36 can also be used. That is, this prism 36 has a 45-degree inclined surface at the lower end, and the reflected light from the wall is captured on this inclined surface and transmitted upward, and the parallax is detected by the two image sensors A and H via the lens 10. It is incorporated as an image with This prism 36 is a prism that does not expand vertically even when it rotates once. As described above, various methods can be considered for capturing images of the entire circumference of the borehole wall as two images with parallax. .

(Effects of the Invention) As explained above, according to the borehole wall circumferential parallax imaging device of the present invention, it is possible to not only obtain images of the entire borehole wall circumference, but also to obtain images with parallax, and to obtain images with parallax. It becomes possible to observe the image as a certain image. Therefore, information regarding the depth, such as the depth of cracks in the rock that appear on the borehole wall, can be obtained. This makes it possible to obtain images containing even more information than before, making it possible to obtain images that are more useful in geological surveys.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing the main parts of a sonde suspended in a borehole according to an embodiment of the present invention. FIG. 2 is an overall schematic diagram of the image capturing device equipped with the sonde 11i)j. FIG. 3 is an enlarged view of the connection portion between the end of the optical fiber and the photoelectric conversion element group. FIG. 4 is a plan view showing the image of the entire circumference of the borehole wall reflected on the conical mirror 9b in FIG. 1, FIG. 5(A) is a developed view of FIG. 4, and FIG. ) after a predetermined period of time. Figures S6.7 and 8 are sectional views of main parts of different embodiments, respectively. DESCRIPTION OF SYMBOLS 1... Borehole, 2... Ground, 3... Lifting device, 4... Cable, 5... Sonde, 7a... Illumination lamp, 8... Condensing lens, 9a... Conical mirror 9b for projecting light... Conical mirror io for receiving light... Focusing lens. 11... Optical fiber, 12... Photoelectric conversion device. 13... Central control device. 14... Expanded image processing device, 15... Expanded image storage device. 19... Synthesizing device, 20... Composite image display device, 21... Recording device. 22...Video monitor.

Claims (1)

[Claims] (1) A lifting device installed on the ground, a sonde suspended via a cable by the lifting device and raised and lowered within the borehole, a lighting device that projects light from inside the sonde onto the entire circumference of the borehole wall, and the borehole. a conical mirror that reflects upward the reflected light from the entire circumference of the wall; and a conical mirror that receives the reflected light by arranging the starting ends of the conical mirror upwardly on the same circumference as the conical mirror, doubly arranged inside and outside. two sets of optical fibers guided to the ground together with the cable; photoelectric conversion means for receiving the reflected light propagated by the optical fibers and outputting image data; and processing the image data for each set of the optical fibers. a developed image creating means for forming a developed image of the developed image, a storage means for storing at least one of these developed images, and a storage device that synchronizes the stored image and the other image and displays them simultaneously or alternately on the same screen or on two screens. What is claimed is: 1. A parallax image capturing device for capturing a full circumference of a borehole wall, comprising: parallax image creation means for creating a parallax image by performing parallax images;