A field calibration device for a borehole panoramic imager

Abstract

The present invention provides a field calibration device for a borehole panoramic imager, including a calibration cylinder; a calibration scale grid is printed on the inner wall of the calibration cylinder, and a compass and a spirit level are provided on the outer wall of the calibration cylinder; the calibration scale grid is longitudinally and evenly divided into four intervals of N-E-S-W, and transversely divided into a number of color calibration areas; the 0° of the compass scale is consistent with the due north direction of the calibration cylinder. The present invention calibrates the reliability of information such as the orientation of the borehole panoramic imager, confirms that the device is in a normal working state, and is convenient to carry to the field work site.

Description

Technical Field

[0001] The present invention relates to a field calibration device for a borehole panoramic imager, belonging to the technical field of geophysical exploration. Background Art

[0002] For existing borehole panoramic imagers, it is impossible to verify the reliability of their azimuth, color, and splicing effect before field work. After the equipment is transported over a long distance and carried manually into the field work site, it is impossible to determine whether its probe is still working properly. For example, a borehole imaging device applicable to underwater disclosed in Chinese Patent with application number 201720028805.6, a borehole imaging device disclosed in Chinese Patent with application number 201420022619.8, an imaging system for the occurrence of fracture spaces in boreholes disclosed in Chinese Patent with application number 201610547489.3, a borehole imaging device disclosed in Chinese Patent with application number 201410016625.7, a detection device for the sediment thickness of engineering foundation piles disclosed in Chinese Patent with application number 201621009654.1, an automatic monitoring system for grouting parameters and a detection method for grouting effect in a weathered argillaceous broken roadway disclosed in Chinese Patent with application number 201611263322.0, a detection method and device for the sediment thickness of engineering foundation piles disclosed in Chinese Patent with application number 201610780441.7, a device and method for detecting the geometric contour of a cavity by borehole camera disclosed in Chinese Patent with application number 201410653673.7, and an imaging system for the occurrence of fracture spaces in boreholes disclosed in Chinese Patent with application number 201620731453.6. Also, for example, a method for testing the accuracy of a borehole imager disclosed in Chinese Patent with application number 201710469470.6, which is the factory inspection link of the borehole panoramic imager, and its detection method and inspection device are both fixedly installed in the laboratory and are not convenient to carry to the field. Summary of the Invention

[0003] To solve the above technical problems, the present invention provides a field calibration device for a borehole panoramic imager, which is used for verifying the reliability of the borehole panoramic imager during field work, is convenient to carry to the field, verifies that the borehole imager is in a normal working state before work, and ensures the smooth progress of subsequent work.

[0004] The present invention is achieved through the following technical solutions.

[0005] A field calibration device for a borehole panoramic imager provided by the present invention includes a calibration cylinder; a calibration scale grid is printed on the inner wall of the calibration cylinder, and a compass and a level bubble are provided on the outer wall of the calibration cylinder; the calibration scale grid is longitudinally evenly divided into four intervals of N-E-S-W, and transversely divided into several color calibration areas; the 0° of the compass scale is consistent with the due north direction of the calibration cylinder.

[0006] The compass and the level bubble are connected to the calibration cylinder through a compass fixing ring.

[0007] The material of the calibration cylinder is PVC.

[0008] The inner diameter of the calibration cylinder is 110 mm, and the length is 60 cm to 90 cm.

[0009] The horizontal scale of the calibration scale grid is an angle calibration scale, and the vertical scale is a depth calibration scale.

[0010] The depth calibration scale is marked in 1 mm, the angle calibration scale is marked in 0.9599 mm, and each scale of the angle calibration scale represents 1° in the 110 mm inner diameter of the calibration cylinder.

[0011] Several color calibration areas are evenly divided into three intervals, and the scales of the three intervals are distinguished by different colors.

[0012] The beneficial effects of the present invention are as follows: to calibrate the reliability of information such as the orientation of the borehole panoramic imager, confirm that the device is in a normal working state, and is convenient to carry to the field work site. Description of the Drawings

[0013] Figure 1 is a schematic structural diagram of the present invention;

[0014] Figure 2 is Figure 1 the unfolded view of

[0015] Figure 3 is Figure 2 the enlarged view of part A;

[0016] In the figure: 1 - calibration cylinder, 2 - compass, 3 - level bubble, 4 - compass fixing ring, 5 - calibration scale grid, 6 - color calibration area, 7 - depth calibration scale, 8 - angle calibration scale. Detailed Embodiments

[0017] The technical solution of the present invention will be further described below, but the scope of protection is not limited thereto.

[0018] Such as Figures 1 to 3As shown in the figure, a field calibration device for a borehole panoramic imager includes a calibration cylinder 1; a calibration scale grid 5 is printed on the inner wall of the calibration cylinder 1, and a compass 2 and a level bubble 3 are provided on the outer wall of the calibration cylinder 1; the calibration scale grid 5 is longitudinally evenly divided into four intervals of N-E-S-W (north - east - south - west), and transversely divided into several color calibration areas 6; the 0° of the scale of the compass 2 is consistent with the due north direction of the calibration cylinder 1.

[0019] The compass 2 and the level bubble 3 are connected to the calibration cylinder 1 through a compass fixing ring 4.

[0020] The material of the calibration cylinder 1 is PVC.

[0021] The inner diameter of the calibration cylinder 1 is 110 mm, the length is 60 cm to 90 cm, and the color is white; different specifications and colors can be set according to requirements.

[0022] The horizontal scale of the calibration scale grid 5 is an angle calibration scale 8, and the vertical scale is a depth calibration scale 7.

[0023] The depth calibration scale 7 is marked at 1 mm, the angle calibration scale 8 is marked at 0.9599 mm, and each scale of the angle calibration scale 8 represents 1° in the 110 mm inner diameter of the calibration cylinder 1.

[0024] Several color calibration areas 6 are evenly divided into three intervals (three parts), and the scales of the three intervals are distinguished by different colors.

[0025] Preferably, the scales (depth calibration scale 7 and angle calibration scale 8) in the color calibration area 6 are respectively marked in red, cyan, and blue.

[0026] In summary, for the existing borehole panoramic imager, during on-site work, it is impossible to judge whether the electronic compass in the probe is working properly and whether the spliced image restores the true geological conditions of the borehole. This device can be easily carried to the field project site (work site), placed vertically, adjusted so that 0° of the compass is due north, the level bubble is leveled, a vertical borehole is simulated, and the borehole panoramic imager is used to simulate image the device. If the distribution map of the test results is consistent with the orientation marked on the calibration cylinder, the angles are the same, the depths are equal and in a straight line, and the colors are the same, it can be confirmed that the borehole panoramic imager is working properly. Otherwise, the borehole panoramic imager is not working properly and needs to be repaired.

Claims

1. A field calibration device for a borehole panoramic imager, comprising a calibration cylinder (1), characterized in that: The inner wall of the calibration cylinder (1) is printed with a calibration scale grid (5), and a compass (2) and a spirit level (3) are provided on the outer wall of the calibration cylinder (1); the calibration scale grid (5) is longitudinally evenly divided into four intervals of N - E - S - W, and transversely divided into several color calibration areas (6); the 0° of the scale of the compass (2) is consistent with the due north direction of the calibration cylinder (1).

2. The field calibration device for a borehole panoramic imager according to claim 1, characterized in that: The compass (2) and the spirit level (3) are connected to the calibration cylinder (1) through a compass fixing ring (4).

3. The field calibration device for a borehole panoramic imager according to claim 1, characterized in that: The calibration cylinder (1) is made of PVC.

4. The field calibration device for a borehole panoramic imager according to claim 1, characterized in that: The inner diameter of the calibration cylinder (1) is 110 mm, and the length is 60 cm to 90 cm.

5. The field calibration device for a borehole panoramic imager according to claim 1, characterized in that: The horizontal scale of the calibration scale grid (5) is an angle calibration scale (8), and the vertical scale is a depth calibration scale (7).

6. The field calibration device for a borehole panoramic imager according to claim 5, characterized in that: The depth calibration scale (7) is marked at 1 mm, the angle calibration scale (8) is marked at 0.9599 mm, and each scale of the angle calibration scale (8) represents 1° in the 110 mm inner diameter of the calibration cylinder (1).

7. The field calibration device for a borehole panoramic imager according to claim 1, characterized in that: Several color calibration areas (6) are evenly divided into three intervals, and the scales of the three intervals are distinguished by different colors.

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