JPH0447758B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a continuous printing device for borehole wall images, which obtains continuous photographs of developed images from borehole wall surface information measured by a borehole scanner.

[Conventional technology]

When excavating a dam or underground cavity, a geological survey of the construction site is required. In such geological surveys, a borehole is formed by boring at the construction site, and the inside of the borehole is observed visually. Conventional observation devices of this type include borehole televisions, borehole periscopes, borehole cameras, and borehole cameras.・There are devices such as scanners.

Borehole television is a system in which a small television camera is suspended from a cable and viewed on a monitor television above the ground. Since the viewing angle of this borehole TV is around 30 degrees, the mirror attached to the tip is rotated to observe the entire circumference of the inner wall of a borehole, pipe, etc. (hereinafter referred to as a "borehole"). When performing analysis, a camera photographs each screen of a color television, and the images are stitched together to create a developed image. In addition, these observation images are recorded on a VTR, and the orientation of the observation images is such that the angle of rotation from the north is displayed in the observation images.

A borehole periscope is a periscope that is inserted into a borehole, and is used to observe objects by connecting a pipe to a head consisting of an objective lens and a reflector, and looking through an eyepiece on the ground. This borehole
The angle of view of the periscope is around 30 degrees, similar to borehole television, and in order to observe the entire circumference, the observer must rotate the entire periscope on the ground.
To record these observation images, a camera is attached to the eyepiece to take pictures of the necessary areas, and a magnet is attached to the eyepiece to read the position of the needle with the naked eye.

A borehole camera is a device in which a head with a built-in panoramic camera is suspended by a cable and lowered into the borehole to take a developed photograph of a certain section.The head is then retrieved and the film is developed to obtain a developed image. The width of the developed image in one rotation of a borehole camera is 1 to 1.5 cm, and one film can cover approximately
Capable of photographing a 50cm area. Therefore, in order to obtain a continuous developed image, developed images with a width of 1 to 1.5 cm must be vertically pasted together. Note that the north direction is imprinted on the film.

A borehole scanner rotates an optical head to irradiate a light beam onto the inner wall of the borehole, receives the reflected light with a photoelectric converter, converts it into an electrical signal, and creates an image based on the direction and depth of the irradiation of the light beam. This is what you get.

[Problem that the invention seeks to solve]

In order to know the direction and slope of cracks and strata, it is more accurate and efficient to create a developed image and observe the whole. However, with conventional borehole televisions and borehole pelscopes, it is not possible to observe the entire area at once, and it is extremely time-consuming to stitch together photographs to obtain a developed image. On the other hand, borehole cameras can relatively easily obtain images of the entire circumference, but they can only measure an area of about 50 cm at a time, and the head must be raised and lowered each time the film is changed. Furthermore, since the developed image cannot be confirmed until after the film has been developed, it is impossible to make decisions on the spot, and if a mistake is made, it is necessary to go to the scene again and take the image again. Compared to the above-mentioned devices, the borehole scanner uses the rotation of the optical head, that is, synchronizes with the scan signal, and converts the reception signal of the light beam into an electrical signal, for example, into a luminance signal, which is displayed on a display device. Therefore, a developed image can be obtained at the time of measurement. It has an excellent point. However, with such a display device, it is not possible to obtain a hard copy of the entire developed image.

The present invention is based on the above invention, and includes:
The object of the present invention is to provide a continuous printing device for borehole wall images, which is capable of creating hard copies of continuous developed images in the depth direction of a borehole from image signals obtained using a borehole scanner.

[Means for solving problems]

To this end, the present invention aims to develop the borehole based on measurement signals from a borehole scanner that irradiates the inner wall of the borehole with a light beam, moves it in the depth direction of the borehole while rotating, and measures the intensity of the reflected beam from the inner wall of the borehole. A borehole scanner hardcopy device for obtaining images,
The film is equipped with a film for recording a developed image, a light source that is dimmed by the measurement signal, and a polygonal columnar optical scanning means that reflects the light from the light source and scans the film, while moving the film in the longitudinal direction. The polygonal prism of the optical scanning means is rotated, and one side of the polygonal prism is used to scan the film in the direction perpendicular to the longitudinal direction.
The light source is dimmed by a measurement signal while the light beam makes one revolution around the inner wall during line scanning, and the developed image of the borehole is recorded in the longitudinal direction of the film corresponding to the depth direction of the borehole. It is characterized by this.

[Effect]

In the borehole scanner hard copy device of the present invention, the light from the light source is directed in the longitudinal direction onto the film at the angle of rotation at which one face of the polygonal prism of the light reflecting means reflects, which corresponds to one rotation of the light beam irradiation in the borehole. While scanning in the direction perpendicular to the
Since the film is moved in the longitudinal direction in accordance with the movement of the borehole in the depth direction, continuous development images of the borehole can be printed on the film.

〔Example〕

Examples will be described below with reference to the drawings.

FIG. 1 is a diagram showing an overview of the steel properties of a borehole scanner system to which the present invention is applied, and FIG. 2 is a diagram for explaining one embodiment of the borehole scanner hard copy device of the present invention. . In the figure, 1 is a borehole scanner section, 2 is a data processing control device, 3 is a storage device, 4 is an image processing device, 5 is a printer, 11 is a turning motor,
12 and 22 are light sources, 13 is a photoelectric converter, 21 is a prism, and 23 is a film, respectively.

In Figure 1, the borehole scanner section 1
Although the details will be described later in FIG. A light beam is irradiated onto the wall of the borehole while rotating, and the reflected light is converted into an electrical signal by a photoelectric converter 13, thereby obtaining image information of the borehole wall. The data processing control device 2 includes, for example, a microprocessor, and controls the rotation motor 11 and light source 12 of the borehole scanner section 1 and processes electrical signals from the photoelectric converter 13.
Therefore, electrical signals can be stored as image information in the storage device 3, a hard copy of a continuous developed image in the depth direction of the borehole can be outputted from the image processing device 4, and a printer 5 or a monitor/television (not shown) can be used. Performs processing to output developed images and other necessary information from output devices such as. The image processing device 4 outputs a hard copy of a continuous expanded image in the depth direction of the borehole.
It is configured as shown in the figure.

In FIG. 2, the light source 22 has its brightness controlled based on an electrical signal obtained from the photoelectric converter 13 shown in FIG. It may be used as is, or it may be stored in the storage device 3 and then read out in the scan order.
The prism 21 is used as a polygonal columnar reflecting mirror, and the light from the light source 22 is reflected by the prism 21 and irradiated onto the film 23. As shown in FIG. 2, when this prism 21 is rotated in the direction of the arrow,
If the prism 21 is hexagonal, the reflected light from the light source 22 will repeatedly scan the film 23 six times per rotation in a direction perpendicular to the longitudinal direction. Therefore, the rotation speed of this prism is synchronized with the rotation speed of the scanner rotation motor 11 shown in FIG.
When the brightness of the light source 22 is controlled based on the electric signal obtained from the photoelectric converter 13, a hard copy of a continuous developed image in the depth direction of the borehole is obtained on the film 23. .
If the electrical signal obtained from the photoelectric converter 13 is not just a brightness (brightness) signal but a signal using the brightness of the three colors of red, blue, and green, the light source 22 can of course also perform adjustment based on these signals. It goes without saying that color hard copies can be obtained by using light.

Fig. 3 is a diagram showing a specific configuration example of the borehole scanner unit and the image processing device, Fig. 4 is a diagram showing the locus of the hole wall developed surface scanned by the light beam, and Fig. 5 is a diagram showing the trajectory of the hole wall developed surface scanned by the light beam.
The figure shows an example of the configuration of a multi-spectral scanner. In the figure, 31 is a borehole;
32 is a sonde, 33 is a turning motor, 34 is a direction indicator, 35 and 42 are lenses, 36 is a mirror, 37
is an optical head, 39, 46 and 49 are photoelectric converters,
40 is a half mirror, 41 and 38 are slits,
43 is a light source, 44 is a prism, 45 is a wavelength selection slit, 47 is an optical fiber, and 48 is a filter.

FIG. 3a shows a specific example of the configuration of the borehole scanner section 1 explained in FIG. 1. In FIG. 3a, a sonde 32 that moves up and down in a borehole 31 has an optical head 37 equipped with a direction indicator 34, a lens 35, and a mirror 36 connected to a turning motor 33. Also, a light source 43 for sending a light beam to the optical head 37 through the half mirror 40, a lens 42 for creating the light beam, a slit 41, and a slit 38 for detecting the reflected beam from the optical head 37. , a photoelectric converter 39 are provided.
With such a configuration, the light from the light source 43 is
The light is formed into a beam by a lens 42 and a slit 41, and is irradiated onto the inner wall of the borehole through a half mirror 40, a mirror 36, and a lens 35. The intensity of the reflected beam is then measured by a photoelectric converter 39 through a lens 35, a mirror 36, a half mirror 40, and a slit 38. Therefore, when the sonde 32 is lowered while the optical head 37 is rotated by the rotation motor 33, the inner wall of the borehole is scanned as shown in FIG. 4, and an electric signal corresponding to the intensity of the reflected beam is transmitted to the photoelectric sensor. It will be obtained from converter 39. The image signal of the borehole wall obtained from the photoelectric converter 39 causes the second
Prism 21, light source 22, film 23 shown in the figure
FIG. 3b shows an example of the block configuration of the control system of the image processing apparatus 4 that controls the image processing apparatus 4.

In FIG. 3b, the light source drive unit 22' modulates the brightness of the light source 22 according to the image signal, and the prism drive unit 21' includes, for example, a drive motor and modulates the prism according to the supply speed of the image signal. 2
1, and the film drive unit 2
3' is for feeding the film 23 at a predetermined speed. The control unit 24 transmits the light source 2 from the storage device 3 or the photoelectric converter 39 of the scanner to the light source drive unit 22'.
2, a rotation signal for the polysm 21 is supplied to the prism drive section 21', and a feed signal for the film 23 is supplied to the film drive section 23'.

Next, an outline of the rotation control of the prism 21 and the film feeding control will be explained.

For example, when inputting an image signal directly from the photoelectric converter 39 of a scanner to print a developed image on a film, if the prism 21 has six sides, six Since the line is printed, the control section 24 causes the prism 21 to rotate at a rotation speed that is 1/6 of the rotation speed of the optical head 37. In other words, the prism 21 is rotated once while the optical head 37 rotates six times.
The prism drive unit 21' is controlled to rotate.

In addition, when reading the image signal once stored in the storage device 3 from the photoelectric converter 39 of the scanner and printing the developed image on the film, the number of image signal points obtained in one rotation of the optical head 37 is adjusted to the reading speed. Based on this, the prism drive section 21' is controlled so that the prism 21 rotates once while reading image signals for six rotations. Alternatively, it goes without saying that the rotation speed of the prism 21 may be determined, and image signals corresponding to six rotations of the optical head 37 may be read out from the storage device 3 during one rotation in synchronization with the rotation of the prism 21.

In this case, the printing of each line may be started by synchronizing the rotation of the prism 21 by using a reference signal which is outputted by the optical head 37 each time the optical head 37 passes a reference direction or position.

Control of film advance is determined by the resolution required for the developed image in relation to the moving speed of the scanner. For example, when attempting to print a 50 cm long wall within the 25 mm length of the film. In this case, the film drive unit 23' may be controlled to advance the film 25 mm in response to the speed at which the scanner moves 50 cm. That is, the film feeding speed may be determined in relation to the moving speed of the scanner depending on the resolution at which the developed image is to be observed in the depth direction of the borehole. Therefore, if the film feed speed is made slower than the scanner's moving speed, it is possible to obtain an image with a longer scanner travel distance per unit length of film; High-resolution images can be obtained with a short scanner movement distance per unit length of film.

In addition to controlling the scanner movement speed and film feed speed as described above, the optical head 3
It goes without saying that by controlling the rotational speed of the prism 7 and controlling the rotational speed of the prism 21 in conjunction with this, the resolution of the image can be similarly controlled. For example, if the moving speed of the scanner is relatively increased and the rotational speed of the optical head 37 is decreased, the resolution of the obtained image signal will be the same, but if both the moving speed of the scanner and the rotational speed of the optical head 37 are increased, the resolution of the obtained image signal will be the same. On the other hand, the film feeding speed can be arbitrarily selected and set depending on the desired resolution in relation to the moving speed of the scanner, but the rotational speed of the prism 21 is It is determined in conjunction with the rotation speed of the optical head 37.

FIG. 5 shows an example of the configuration of a multispectral scanner that selects a wavelength range and measures reflected beams for each wavelength range using a plurality of photoelectric converters. Of these, Figure 5a shows the slit 3 for light reception.
A prism 44 is disposed after 8 to separate the incident light, and a wavelength selection slit 45 selects each wavelength range. The spectral radiation intensity of each selected wavelength range is measured by a photoelectric converter 46 placed after the wavelength selection slit 45. Therefore, for example, by arranging the slits 38 in three color regions of red, blue, and green, a color image can be obtained by combining the spectral radiation intensities of the three colors on a color monitor screen. By measuring the spectral radiation intensity in the infrared region, a brightness image in the infrared region can be obtained. On the other hand, FIG. 5b shows a structure in which the starting ends of the optical fibers 47 are placed opposite each other after the light-receiving slit 38 so that the beam reflected from the hole wall that has passed through the slit 38 is incident, and the terminal ends of the optical fibers 47 are separated and separated into individual parts. bandpass・
Each wavelength region is selected by arranging a filter 48 such as a filter or a cut filter. The spectral radiation intensity of each selected wavelength range is measured by a photoelectric converter 49 placed after the filter 48.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, it is possible to directly print onto a continuous film using the electrical signals of the borehole scanner, so it is easy to print a developed image of the borehole (inside the borehole). The analysis efficiency of geological information is significantly improved compared to conventional methods.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an overview of the configuration of a borehole scanner system to which the present invention is applied, FIG. 2 is a diagram for explaining one embodiment of the borehole scanner hard copy apparatus of the present invention, and FIG. The figure shows a specific configuration example of the borehole scanner section and the image processing device, Figure 4 shows the locus of the developed surface of the hole wall scanned by the light beam, and Figure 5 shows the configuration of the multispectral scanner. It is a figure which shows an example. 1...Borehole scanner section, 2...Data processing control device, 3...Storage device, 4...Image processing device, 5...Printer, 11 and 33...Swivel motor, 12, 22 and 43... light source, 13,3
9, 46 and 49... photoelectric converter, 21 and 44...
Prism, 23...Film, 31...Borehole, 32...Sonde, 34...Direction indicator, 35 and 4
2... Lens, 36... Mirror, 37... Optical head, 40... Half mirror, 41 and 38...
Slit, 45...Wavelength selection slit, 47...
Optical fiber, 48...filter.

Claims (1)

[Claims] 1 A borehole scanner that irradiates the inner wall of the borehole with a light beam and moves it in the depth direction of the borehole while rotating, and obtains an expanded image of the borehole from the measurement signal of a borehole scanner that measures the intensity of the reflected beam from the inner wall of the borehole. Scanner
A hard copy device, comprising: a film for recording a developed image; a light source whose light is modulated by the measurement signal;
and a polygonal prism light scanning means for reflecting the light from the light source and scanning the film, and rotating the polygonal prism of the light scanning means while moving the film in the longitudinal direction, and scanning one surface of the polygonal prism. The light source is dimmed by the measurement signal while the light beam makes one revolution around the inner wall by scanning one line in the direction perpendicular to the longitudinal direction of the film. A borehole scanner hard copy device characterized in that it is configured to record a developed image of a borehole in the longitudinal direction.