JPH0989554A - Level measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect the level variation of an object part continuously by simultaneously picking up the light source image of a height change measured object part and the light source image of a reference point, and correcting the displacement of a level gauge on the basis of the fluctuation of each light source image. SOLUTION: A CCD camera 2 picks up the images of an object part light source 7 and a reference point light source 8 simultaneously in one image plane by a half mirror 6 through a level gauge 1. An image processing device 3 detects the displacement quantity of two light sources, and a computer 4 corrects the position of the level gauge 1 itself on the basis of the displacement quantity. The correct level displacement quantity of the object part is then computed, and change with the lapse of time is recorded, that is, the level measurement of the object part and correction based on a reference point can be performed automatically, so that the level fluctuation of the object part can be measured continuously over a long period of time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a level measuring device for measuring a height change amount of a specific portion of a large facility or a large structure.

[0002]

2. Description of the Related Art FIG. 4 is a plan view showing the structure of a conventional level measuring device. This device is an example used to measure how the height of the bearing part of turbine equipment changes before and during its operation. In the figure, 11
Is a level meter, which is a kind of telescope, in which an objective lens is engraved with a cross line consisting of a horizontal line and a vertical line. 12 is a vertical rotation axis for rotating the same level meter, 13
Is an eyepiece of the same level meter, 14 is a measuring object part vertically attached to the measuring object part, and 15 is a reference point which is in a direction perpendicular to the line from the rotary shaft 12 to the measuring object part 14 It is a reference point ruler fixed vertically at.

In this apparatus, the displacement of the target portion is determined by observing the target portion ruler 14 from the eyepiece 13 of the level meter 11 before and during driving, and aligning the scale with the vertical line of the objective lens. The scale is read at the position of the horizontal line of the objective lens, and the change in level (height of the target site) is known from the difference. Since the level change amount read in this way includes an error due to the displacement of the level meter itself, the level meter is rotated around the rotating shaft 12 before and during the operation, so that the reference point ruler is provided. In the same manner as described above, the scale of the ruler is read toward 15, and the correction amount is calculated from the difference between the readings to correct the displacement amount of the target portion.

[0004]

In order to temporally know the change in the height of the target portion in the above measuring device, the worker reads the ruler many times during the operation of the target equipment. Further, since the ruler is placed at the target portion and the reference point, it is necessary to repeatedly change the direction of the level meter. For this reason, the height change can be measured only intermittently, and the continuous height change cannot be known. In addition, there is a problem that a large amount of labor is required for the worker to measure the level for a long period of time.

The present invention aims to solve the above-mentioned drawbacks of the prior art and to provide a level measuring apparatus capable of continuously detecting and recording the level change amount of a target portion.

[0006]

DISCLOSURE OF THE INVENTION The present invention has solved the above-mentioned problems, and is a level meter, and a half mounted on the front end of the level meter so as to be inclined with respect to its optical axis and capable of reflecting in the lateral direction. Half of a light source placed at a height change measurement target site, which includes a mirror, a camera for imaging an object through the same level meter, an image processing device connected to the camera, and a calculation unit connected to the image processing device. The image transmitted through the mirror and the image reflected by the half mirror of the light source placed at the reference point are simultaneously captured by the camera, the coordinate position of the image of each of the light sources is detected by the image processing device, and the calculation means is used. The displacement of the level meter is corrected from the variation of the coordinate position of each image, the displacement of the height change measurement target portion with respect to the reference point is calculated, and the temporal change of the displacement is continuously recorded. It relates that level measuring device.

[0007]

1 is a plan view showing the structure of a level measuring apparatus according to an embodiment of the present invention. In the figure, reference numeral 1 is a level meter, which is a kind of telescope. 2 is a CC attached to a position corresponding to the eyepiece of the same level meter
It is a D camera. This may be a normal video camera.
3 is an image processing device connected to the CCD camera, 4 is a small computer connected to the image processing device, 5 is a monitor device connected to the computer for displaying an image, and 6 is the level meter 1
Is fixed to the optical axis of the optical axis at an angle of 45 degrees and is fixed to the half mirror. Reference numeral 7 is a target portion light source fixed to the measurement target portion. Reference numeral 8 connects the level meter 1 and the target portion light source 7. It is a reference point light source that is perpendicular to the line and is fixed to a reference point that is located horizontally in a horizontal direction from the intersection of the half mirror 6 and the optical axis of the level meter.

In the present apparatus, the CCD camera 2 can simultaneously pick up the images of the light source 7 for the target part and the light source 8 for the reference point on one screen through the level meter 1 by the action of the half mirror 6. it can. The image processing device 3 detects the displacement amounts of the two light sources. The computer 7 corrects the position of the level meter itself from the displacement amounts of the two light sources, calculates the correct level displacement amount of the target portion, and records the change over time.

FIG. 2 is a diagram of a first example for explaining the relationship between the position change of the light source image on the screen imaged by the CCD camera and the displacement of the target portion. A in the figure is an image corresponding to the target portion and the initial position of the level meter, and B in the figure is an image after displacement. 7a is an initial position of the target part light source image, 8a is an initial position of the reference point light source image, 7b is a position after displacement of the target part light source image, 8b is a position after displacement of the reference point light source image,
ΔL ₁ is the displacement amount of the target portion light source image, ΔL ₂ is the displacement amount of the reference point light source image, and L is the corrected displacement amount of the target portion. In this example, ΔL ₂ = 0. This shows that there is no displacement in the level meter itself, and is an example in the case where only the image of the target site light source is displaced. In the case of this example, the displacement amount of the target portion is L = ΔL ₁ .

FIG. 3 is a diagram of a second example for explaining the relationship between the position change of the light source image on the screen and the change of the target portion. The meanings of the symbols are the same as in the case of FIG. This example is an example in which both the target portion light source image and the reference point light source image are displaced. ΔL ₂ corresponds to the amount of displacement of the level meter itself. In this example, L = ΔL ₁ −ΔL ₂ is the displacement amount of the target portion.

The above-mentioned correction of displacement and the corrected amount of displacement of the target portion are recorded by a computer with the passage of time, and are used for examination of the operating state of the target.

[0012]

As described above, according to the present invention, the level measurement of the target site and the correction by the reference point can be automatically performed, so that the level fluctuation of the target site can be continuously measured for a long period of time. Therefore, the measurement accuracy and stability are improved, and the measurement is greatly improved in terms of labor saving.

[Brief description of drawings]

FIG. 1 is a plan view showing the configuration of a level measuring device according to an embodiment of the present invention.

FIG. 2 is a diagram of a first example showing a relationship between a position change of a light source image on a screen of the level measuring device and a displacement of a target site.

FIG. 3 is a diagram of a second example showing the relationship between the position change of the light source image on the screen of the level measuring device and the displacement of the target site.

FIG. 4 is a plan view showing the configuration of a conventional level measuring device.

[Explanation of symbols]

1 Level meter 2 CCD camera 3 Image processing device 4 Computer 5 Monitor device 6 Half mirror 7 Target part light source 7a Initial position of target part light source image 7b Position after displacement of target part light source image 8 Reference point light source 8a Reference point light source image Initial position 8b Position after displacement of reference point light source image L Displacement amount of target site ΔL ₁ Displacement amount of target site light source image ΔL ₂ Displacement amount of reference point light source image

Claims (1)

[Claims] 1. A level meter, a half mirror attached to the front end of the level meter so as to be inclined with respect to its optical axis and capable of reflecting in the lateral direction, a camera for imaging an object through the level meter, and a camera connected to the same. Image processing device, and a calculation means connected to the image processing device, the image transmitted through the half mirror of the light source placed at the height change measurement site and the half mirror of the light source placed at the reference point. The reflected image and the image are simultaneously captured by the camera, the coordinate position of the image of each light source is detected by the image processing device, and the displacement of the level meter is corrected from the variation of the coordinate position of each image by the calculation means, A level measuring device characterized by calculating a displacement of a height change measurement target portion with respect to a reference point and continuously recording a temporal change of the displacement.