CN114660084A - Device and method for calibrating borehole television imager - Google Patents

Device and method for calibrating borehole television imager Download PDF

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Publication number
CN114660084A
CN114660084A CN202210434442.1A CN202210434442A CN114660084A CN 114660084 A CN114660084 A CN 114660084A CN 202210434442 A CN202210434442 A CN 202210434442A CN 114660084 A CN114660084 A CN 114660084A
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China
Prior art keywords
calibration
line width
degrees
television imager
inclination
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Inventor
周振杰
李绍辉
曹玉芬
韩鸿胜
李妍
朱怀东
赵禹晴
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Tianjin Research Institute for Water Transport Engineering MOT
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Tianjin Research Institute for Water Transport Engineering MOT
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Priority to CN202210434442.1A priority Critical patent/CN114660084A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60—Control of cameras or camera modules
    • H04N23/695—Control of camera direction for changing a field of view, e.g. pan, tilt or based on tracking of objects
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G01N2021/0106—General arrangement of respective parts
    • G01N2021/0112—Apparatus in one mechanical, optical or electronic block
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2201/00—Features of devices classified in G01N21/00
    • G01N2201/12—Circuits of general importance; Signal processing
    • G01N2201/127—Calibration; base line adjustment; drift compensation

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  • Health & Medical Sciences (AREA)
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  • General Physics & Mathematics (AREA)
  • General Health & Medical Sciences (AREA)
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  • Geophysics And Detection Of Objects (AREA)

Abstract

A borehole television imager calibration device and method. The device comprises a rotating table, an inclined table, a calibration barrel bracket, a calibration barrel, a gyroscope, a control box and a notebook computer; the lower end of the inclined platform is fixed at the upper end of the rotating platform; the lower end of the calibration barrel support is fixed at the upper end of the inclined table, and the upper end of the calibration barrel support is fixed with a calibration barrel; the gyroscope is arranged at the bottom of the calibration barrel bracket; the control box is respectively and electrically connected with the rotating platform, the tilting table, the gyroscope and the notebook computer. The device and the method for calibrating the borehole television imager have the following beneficial effects that: the calibrating device is high in systematic integration level, realizes the calibrating function of the inclination angle, the azimuth angle, the line width resolution and the line width indicating value error of the drilling television imager, does not need to be repeatedly disassembled and connected with testing equipment in the testing process, is easy to realize, and has good application effect and popularization value.

Description

Device and method for calibrating borehole television imager
Technical Field
The invention belongs to the technical field of measurement and calibration of traffic and water transportation engineering, and particularly relates to a device and a method for calibrating a borehole television imager.
Background
The pile foundation is a common deep foundation, has wide application in the field of water transport engineering, is a main bearing part of a hydraulic building structure, and the quality of the pile foundation is directly related to the application safety and the durability of the structure. However, the pile foundation is a concealed project, and a professional detection means is required to be adopted for evaluating and judging the quality of the pile foundation. At present, pile body detection methods comprise a static load test method, a sound wave transmission method, a core drilling method, a high strain method, a low strain method and the like, detection data of various current detection methods are controversial, and the core drilling method is the most effective verification method. The drilling television imager is commonly used for drilling coring verification, and can be used for observing the positions and the degrees of defects such as holes, cracks, segregation and the like in concrete, observing various abnormalities and defects in the prestressed pipe pile, checking the joint condition and quantitatively analyzing the pile body quality. However, the change of the working environment and the aging of the instrument can cause the measurement performance of the instrument to change, so that the measurement result has larger deviation. It is therefore important to periodically calibrate the metrology performance of a borehole television imager. At present, no relevant technical report of a special calibration device for a borehole television imager exists in China, and if the borehole television imager which is not accurately metered is applied to pile body detection, great potential safety hazards are inevitably brought to engineering.
Disclosure of Invention
In order to solve the above problems, the present invention provides a device and a method for calibrating a borehole television imager.
In order to achieve the aim, the calibrating device for the drilling television imager comprises a rotating table, an inclined table, a calibration barrel bracket, a calibration barrel, a gyroscope, a control box and a notebook computer; wherein, the lower end of the inclined platform is fixed at the upper end of the rotating platform; the lower end of the calibration barrel support is fixed at the upper end of the inclined platform, and the upper end of the calibration barrel support is fixed with a calibration barrel; the gyroscope is arranged at the bottom of the calibration barrel bracket; the control box is respectively and electrically connected with the rotating table, the tilting table, the gyroscope and the notebook computer; the measured borehole television imager comprises a borehole television imager host and a borehole television imager probe which are connected with each other, wherein the borehole television imager probe is fixed on the calibration barrel.
The rotating platform comprises a rotating control motor, a rotating disk, a rotating platform base, a first worm wheel, a first worm and a first coupler; wherein the rotary table base is a box body with an open upper end; the rotary control motor is arranged on the outer side surface of the rotary table base, and the output shaft penetrates through the side surface of the rotary table base and is connected with one end of the first worm through the first coupler; the rotating disc is rotatably arranged on the inner bottom surface of the rotating table base, and a first worm wheel is arranged on the circumferential surface; the first worm is meshed with the first worm wheel.
The tilting table comprises a tilting control motor, a tilting slide block, a tilting table base, a second worm wheel, a second worm, a second coupler and an arc-shaped ball guide rail; wherein the tilting table base is fixed on the rotating disc of the rotating table; the inclination control motor is arranged in the middle of the outer side surface of the inclination table base, and the output shaft penetrates through the side surface of the inclination table base and is connected with one end of the second worm through the second coupling; two arc ball guide rails are arranged at two side parts of the second worm in a parallel mode; the top surface of the inclined sliding block is provided with a calibration barrel support, the bottom surface is arc-shaped, the two sides of the bottom surface are respectively arranged on the two arc-shaped ball guide rails, the middle part of the bottom surface is provided with a second worm wheel, and the second worm wheel is meshed with the first worm wheel.
The calibration barrel comprises a probe clamp, a screw, a support frame, a barrel and a line width calibration plate; wherein, the lower end of the supporting frame is fixed at the upper end of the calibration barrel bracket; the bottom surface of the drum is closed, an opening is formed on the circumferential surface and the top surface respectively, and the middle part of the bottom surface is fixed at the upper end of the support frame; the lower end of the probe clamp is fixed at the outer side part of the opening on the top surface of the barrel and is used for clamping the probe of the drilling television imager and fastening the probe by using screws; the lower end of the probe of the drilling television imager is inserted into the barrel through the opening on the top surface of the barrel; the line width calibration plate is attached to the inner circumferential surface of the barrel, and a plurality of vertical scale marks with different widths and line width standard values are arranged on the surface at intervals.
The method of calibrating a borehole television imager using the borehole television imager calibration apparatus as recited in claim comprising the steps of, in order:
1) sequentially connecting all parts of the calibrating device of the borehole television imager, vertically fixing a probe of the borehole television imager on a probe clamp, electrifying and preheating the calibrating device of the borehole television imager, initializing a serial port, and controlling the rotating table and the tilting table to return to zero positions by a notebook computer; powering on a host of the borehole television imager, and setting parameters to enable the inclination indicating value and the inclination indicating value to be zero;
2) the line width calibration plate is pasted on the inner circumferential surface of the drum from an opening on the circumferential surface of the drum, the position of the line width calibration plate is adjusted to ensure that a host of the drilling television imager can clearly display the image of the line width calibration plate, and the line width indication value of the finest vertical scale mark on the identifiable line width calibration plate in the observed image is the line width resolution;
3) taking each vertical scale mark on the line width calibration plate as a line width calibration point, sequentially reading line width indication values at each line width calibration point on the line width calibration plate from coarse to fine by using a host of a drilling television imager, calculating line width indication value errors according to a formula (1) by combining line width standard values, and taking the maximum value of absolute values in the line width indication value errors at all the line width calibration points as a line width indication value error calibration result;
ΔLi＝Li-Li0 (1)
in the formula:
ΔLithe line width indicating error mm of the measured borehole television imager host computer at each line width calibration point;
l is the line width indication value of the host computer of the tested borehole television imager at each line width calibration point, mm;
Li0-line width markStandard value, mm;
4) selecting-180 degrees, -135 degrees, -90 degrees, -45 degrees, 0 degrees, 45 degrees, 90 degrees, 135 degrees and 180 degrees as azimuth calibration points, controlling the rotating platform to rotate to each azimuth calibration point in sequence by using a notebook computer, respectively reading and recording the inclination indication values at each calibration point displayed by the host computer of the borehole television imager, calculating the azimuth indication value error according to the formula (2) by combining the inclination standard reference value measured by the gyroscope, and taking the maximum value of the absolute values in the azimuth indication value errors at all the azimuth calibration points as the azimuth indication value error calibration result;
Δθi＝θi-θi0 (2)
in the formula:
Δθithe azimuth indicating value error of the host machine of the tested borehole television imager at each azimuth calibration point is measured;
theta is the inclination indication value, DEG of the host of the tested borehole television imager at each azimuth calibration point;
θi0-a reference value, degree, of inclination measured by the gyroscope;
5) selecting-30 degrees, -20 degrees, -10 degrees, -0 degrees, -10 degrees, -20 degrees and 30 degrees as inclination angle calibration points, utilizing a notebook computer to control an inclination table to incline to each inclination angle calibration point in sequence, respectively reading and recording inclination angle indication values at each inclination angle calibration point displayed by a drilling television imager host, calculating inclination angle indication value errors according to a formula (3) by combining inclination angle standard reference values measured by a gyroscope, and taking the maximum value of absolute values in the inclination angle indication value errors at all the inclination angle calibration points as an inclination angle indication value error calibration result;
Δλi＝λi-λi0 (3)
in the formula:
Δλithe inclination angle indicating value error degree of the host machine of the tested borehole television imager at each inclination angle calibration point;
lambda is the dip angle indication value, DEG of the host of the tested borehole television imager at each dip angle calibration point;
λi0-measured by a gyroscopeIs measured in a standard reference value of inclination angle, °.
The device and the method for calibrating the borehole television imager have the following beneficial effects that: the calibrating device is high in systematic integration level, realizes the calibrating function of the inclination angle, the azimuth angle, the line width resolution and the line width indicating value error of the drilling television imager, does not need to be repeatedly disassembled and connected with testing equipment in the testing process, is easy to realize, and has good application effect and popularization value.
Drawings
FIG. 1 is a schematic structural diagram of a borehole television imager calibration apparatus provided in the present invention;
FIG. 2 is a schematic diagram of a rotary table in the calibrating apparatus for a borehole television imager provided in the present invention;
FIG. 3 is a schematic diagram of an inclined table in the calibrating apparatus for a TV imager for borehole provided by the present invention;
fig. 4 is a schematic diagram of a calibration barrel structure in the calibration device for the borehole television imager provided by the present invention.
Fig. 5 is a block diagram of a calibration device for a borehole television imager provided by the present invention.
Detailed Description
The following describes in detail the calibration apparatus and method for a borehole television imager according to the present invention with reference to the accompanying drawings and specific embodiments.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
As shown in fig. 1 and 5, the calibration device for a borehole television imager provided by the present invention comprises a rotary table 10, an inclined table 20, a calibration barrel support 30, a calibration barrel 40, a gyroscope 50, a control box 60 and a notebook computer 70; wherein, the lower end of the inclined platform 20 is fixed on the upper end of the rotating platform 10; the lower end of the calibration barrel bracket 30 is fixed at the upper end of the inclined platform 20, and the upper end of the calibration barrel bracket 30 is fixed with a calibration barrel 40; the gyroscope 50 is mounted at the bottom of the calibration barrel support 30; the control box 60 is electrically connected to the rotary table 10, the tilting table 20, the gyroscope 50 and the notebook computer 70; the tested borehole television imager comprises a borehole television imager host 80 and a borehole television imager probe 90 which are connected with each other, wherein the borehole television imager probe 90 is fixed on the calibration barrel 40.
As shown in fig. 2, the rotary stage 10 includes a rotation control motor 101, a rotary plate 102, a rotary stage base 103, a first worm wheel 104, a first worm 105, and a first coupling 106; wherein the rotating table base 103 is a box body with an open upper end; the rotation control motor 101 is installed on the outer side surface of the rotating platform base 103, and the output shaft penetrates through the side surface of the rotating platform base 103 and is connected with one end of a first worm 105 through a first coupling 106; the rotary table 102 is rotatably mounted on the inner bottom surface of the rotary table base 103, and a first worm gear 104 is provided on the circumferential surface; the first worm 105 is meshed with the first worm wheel 104; the control box 60 sends a command to rotate the rotation control motor 101, so as to drive the first coupling 101 and the first worm 105 to rotate synchronously, and then the first worm 105 drives the first worm wheel 104 to rotate, and finally the rotating disc 102 is caused to rotate.
As shown in fig. 3, the tilting table 20 includes a tilting control motor 201, a tilting slider 202, a tilting table base 203, a second worm gear 204, a second worm 205, a second coupling 206, and an arc-shaped ball guide 207; wherein the tilting table base 203 is fixed on the rotary table 102 of the rotary table 10; the inclination control motor 201 is arranged in the middle of the outer side surface of the inclination table base 203, and an output shaft penetrates through the side surface of the inclination table base 203 and is connected with one end of a second worm 205 through a second coupling 206; two arc-shaped ball guide rails 207 are installed at both side portions of the second worm screw 205 in a parallel manner; the top surface of the inclined sliding block 202 is provided with the calibration barrel bracket 30, the bottom surface is in an arc shape, the two side parts of the bottom surface are respectively arranged on the two arc-shaped ball guide rails 207, the middle part of the bottom surface is provided with a second worm gear 204, and the second worm gear 204 is meshed with the first worm gear 104; the control box 60 sends a command to rotate the tilt control motor 201, so as to drive the second coupling 206 to rotate synchronously with the second worm 205, and then the second worm 205 drives the second worm gear 204 to rotate, and finally the tilt slider 202 tilts along the arc-shaped ball guide 207.
As shown in fig. 4, the calibration barrel 60 includes a probe clamp 601, a screw 602, a support rack 603, a barrel 604 and a line width calibration plate 605; wherein, the lower end of the supporting frame 603 is fixed at the upper end of the calibration barrel bracket 30; the bottom surface of the barrel 604 is closed, an opening is formed on the circumferential surface and the top surface respectively, and the middle part of the bottom surface is fixed at the upper end of the support frame 603; the lower end of the probe clamp 601 is fixed at the outer side of the opening on the top surface of the barrel 604, and is used for clamping the drilling television imager probe 90 and is fastened by a screw 602; the lower end of the borehole television imager probe 90 is inserted into the interior of the drum 604 through an opening in the top surface of the drum 604; the line width calibration plate 605 is attached to the inner circumferential surface of the drum 604, and a plurality of vertical scale lines having different widths and standard line width values are provided at intervals on the surface.
The inclination angle measurement precision of the gyroscope 70 is better than 0.01 degrees, and the inclination stability is better than 0.06 degrees/h.
The inclination measurement range of the calibrating device for the borehole television imager provided by the invention is +/-35 degrees, the inclination measurement precision is better than 0.01 degrees, the inclination measurement range is +/-180 degrees, the inclination measurement precision is better than 0.1 degrees, the line width measurement range is 0.02-10mm, and the maximum allowable error of the line width is +/-0.005 mm.
The working principle of the borehole television imager calibration apparatus provided by the invention is explained as follows:
during operation, the borehole television imager probe 90 is connected to the borehole television imager host 80, the middle of the borehole television imager probe 90 is clamped by the probe clamp 601 on the calibration barrel 60, the screw 602 is tightened, the borehole television imager probe 90 is perpendicular to the ground, and the lower end of the borehole television imager probe 90 is inserted into the barrel 604 through the opening in the top surface of the barrel 604. The control box 60 is connected to the gyroscope 50, the rotary table 10, the tilting table 20, and the notebook computer 70. The borehole television imager host 80 is turned on and reset to zero setting so that the inclination angle and the inclination indication value of the borehole television imager probe 90 are both 0 deg.. The control box 60 is powered on, the notebook computer 70 is turned on, and the rotating table 10 and the tilting table 20 are controlled to return to the zero position. The line width indication value of the vertical scale line on the line width calibration plate 605 in the image displayed by the drilling television imager host 80 is read and compared with the line width standard value of the vertical scale line on the line width calibration plate 605 to obtain the line width indication value error. The line width indication of the finest vertical scale line on the line width calibration board 605 in the image displayed by the observation borehole television imager host 80 is the line width resolution. The notebook computer 70 controls the rotation of the rotating platform 10 and the inclination platform 20 to respectively simulate the inclination and the inclination of pile foundation drilling according to the inclination change of a certain angle value, the inclination value and the inclination value measured by the gyroscope 50 are used as standard reference values, and the inclination indicating value displayed by the drilling television imager host 80 are respectively compared with the inclination and the inclination standard reference values measured by the gyroscope 50 to obtain an inclination indicating value error and an azimuth indicating value error.
The method for calibrating the borehole television imager by using the borehole television imager calibration device comprises the following steps in sequence:
1) sequentially connecting all parts of the calibrating device of the borehole television imager, vertically fixing a probe 90 of the borehole television imager on a probe clamp 601, electrifying and preheating the calibrating device of the borehole television imager, initializing a serial port, and controlling the rotating table 10 and the tilting table 20 to return to zero positions by using a notebook computer 70; powering on the drilling television imager host 80, and setting parameters to enable the inclination indicating value and the inclination indicating value to be zero;
2) attaching the line width calibration plate 605 to the inner circumferential surface of the drum 604 from the opening on the circumferential surface of the drum 604, adjusting the position of the line width calibration plate 605 to enable the drilling television imager host 80 to clearly display the image of the line width calibration plate 605, and observing the line width indication value of the finest vertical scale mark on the identifiable line width calibration plate 605 in the image, namely the line width resolution;
3) taking each vertical scale mark on the line width calibration plate 605 as a line width calibration point, sequentially reading line width indication values at each line width calibration point on the line width calibration plate 605 from coarse to fine by using the drilling television imager host 80, then calculating line width indication value errors according to the formula (1) by combining line width standard values, and taking the maximum value of absolute values in the line width indication value errors at all the line width calibration points as a line width indication value error calibration result;
ΔLi＝Li-Li0 (1)
in the formula:
ΔLimeasured borehole television imager host 80Line width indication error at each line width calibration point, mm;
l is the line width indication value, mm, of the measured borehole television imager host 80 at each line width calibration point;
Li0-line width standard value, mm;
4) selecting-180 degrees, -135 degrees, -90 degrees, -45 degrees, -0 degrees, 45 degrees, 90 degrees, 135 degrees and 180 degrees as azimuth calibration points, controlling the rotating platform 10 to rotate to each azimuth calibration point in sequence by using the notebook computer 70, respectively reading and recording the inclination indicating values at each calibration point displayed by the host computer 80 of the borehole television imager, calculating azimuth indicating value errors according to the formula (2) by combining the inclination standard reference values measured by the gyroscope 50, and taking the maximum value of the absolute values in the azimuth indicating value errors at all the azimuth calibration points as an azimuth indicating value error calibration result;
Δθi＝θi-θi0 (2)
in the formula:
Δθiazimuth error, deg., of the measured borehole television imager host 80 at each azimuth calibration point;
θ -the inclination readings, °, of the borehole video imager host 80 under test at each azimuthal calibration point;
θi0-a trend standard reference value, deg., measured by gyroscope 50;
5) selecting-30 degrees, -20 degrees, -10 degrees, -0 degrees, -10 degrees, -20 degrees and 30 degrees as inclination angle calibration points, using the notebook computer 70 to control the inclination table 20 to incline to each inclination angle calibration point in sequence, respectively reading and recording inclination angle indication values at each inclination angle calibration point displayed by the drilling television imager host 80, calculating inclination angle indication value errors according to a formula (3) by combining the inclination angle standard reference values measured by the gyroscope 50, and taking the maximum value of the absolute values in the inclination angle indication value errors at all the inclination angle calibration points as an inclination angle indication value error calibration result;
Δλi＝λi-λi0 (3)
in the formula:
Δλi-tested borehole televisionThe inclination angle reading error, deg., of imager host 80 at each inclination angle calibration point;
λ is the dip angle reading, degree, of the borehole video imager host 80 at each dip angle calibration point;
λi0-a tilt angle reference value, measured by the gyroscope 50.

Claims (5)

1. The utility model provides a borehole television imager calibrating device which characterized in that: the calibrating device for the drilling television imager comprises a rotating table (10), an inclined table (20), a calibration barrel support (30), a calibration barrel (40), a gyroscope (50), a control box (60) and a notebook computer (70); wherein, the lower end of the inclined platform (20) is fixed at the upper end of the rotating platform (10); the lower end of the calibration barrel support (30) is fixed at the upper end of the inclined platform (20), and the upper end of the calibration barrel support (30) is fixed with a calibration barrel (40); the gyroscope (50) is arranged at the bottom of the calibration barrel bracket (30); the control box (60) is respectively and electrically connected with the rotating platform (10), the tilting platform (20), the gyroscope (50) and the notebook computer (70); the tested borehole television imager comprises a borehole television imager main unit (80) and a borehole television imager probe (90) which are connected with each other, wherein the borehole television imager probe (90) is fixed on the calibration barrel (40).
2. The borehole television imager calibration apparatus of claim 1, wherein: the rotating platform (10) comprises a rotating control motor (101), a rotating disk (102), a rotating platform base (103), a first worm wheel (104), a first worm (105) and a first coupling (106); wherein the rotating platform base (103) is a box body with an open upper end; the rotation control motor (101) is arranged on the outer side surface of the rotating platform base (103), and an output shaft penetrates through the side surface of the rotating platform base (103) and is connected with one end of a first worm (105) through a first coupling (106); the rotary disc (102) is rotatably arranged on the inner bottom surface of the rotary table base (103), and a first worm wheel (104) is arranged on the circumferential surface; the first worm (105) is engaged with the first worm wheel (104).
3. The borehole television imager calibration apparatus of claim 2, wherein: the tilting table (20) comprises a tilting control motor (201), a tilting slide block (202), a tilting table base (203), a second worm wheel (204), a second worm (205), a second coupler (206) and an arc-shaped ball guide rail (207); wherein the tilting table base (203) is fixed on the rotating disc (102) of the rotating table (10); the inclination control motor (201) is arranged in the middle of the outer side face of the inclination table base (203), and an output shaft penetrates through the side face of the inclination table base (203) and is connected with one end of a second worm (205) through a second coupling (206); two arc-shaped ball guide rails (207) are arranged on two side parts of the second worm (205) in a parallel mode; the top surface of the inclined sliding block (202) is provided with a calibration barrel support (30), the bottom surface is arc-shaped, the two side parts of the bottom surface are respectively arranged on the two arc-shaped ball guide rails (207), the middle part of the bottom surface is provided with a second worm gear (204), and the second worm gear (204) is meshed with the first worm gear (104).
4. The borehole television imager calibration apparatus of claim 1, wherein: the calibration barrel (60) comprises a probe clamp (601), a screw (602), a support frame (603), a barrel (604) and a line width calibration plate (605); wherein, the lower end of the supporting frame (603) is fixed at the upper end of the calibration barrel bracket (30); the bottom surface of the barrel (604) is closed, an opening is formed on the circumferential surface and the top surface respectively, and the middle part of the bottom surface is fixed at the upper end of the support frame (603); the lower end of the probe clamp (601) is fixed at the outer side part of the opening on the top surface of the barrel (604) and is used for clamping the drilling television imager probe (90) and is fastened by a screw (602); the lower end of the borehole television imager probe (90) is inserted into the interior of the drum (604) through an opening in the top surface of the drum (604); the line width calibration plate (605) is attached to the inner circumferential surface of the barrel (604), and a plurality of vertical scale marks with different widths and standard line width values are arranged on the surface at intervals.
5. A method of calibrating a borehole television imager using the borehole television imager calibration apparatus of any one of claims 1 to 4, wherein: the method comprises the following steps performed in sequence:
1) sequentially connecting all parts of the calibrating device of the borehole television imager, vertically fixing a probe (90) of the borehole television imager on a probe clamp (601), electrifying and preheating the calibrating device of the borehole television imager, initializing a serial port, and controlling a rotating table (10) and an inclined table (20) to return to zero positions by a notebook computer (70); powering on a drilling television imager host (80), and setting parameters to enable the inclination indicating value and the inclination indicating value to be zero;
2) pasting a line width calibration plate (605) on the inner circumferential surface of a barrel (604) from an opening on the circumferential surface of the barrel (604), adjusting the position of the line width calibration plate (605) to enable a drilling television imager host (80) to clearly display the image of the line width calibration plate (605), and observing the line width indication value of the finest vertical scale mark on the line width calibration plate (605) which can be identified in the image, namely the line width resolution;
3) taking each vertical scale mark on the line width calibration plate (605) as a line width calibration point, sequentially reading line width indication values at all line width calibration points on the line width calibration plate (605) from thick to thin by using a drilling television imager host (80), then calculating line width indication value errors according to a formula (1) by combining line width standard values, and taking the maximum value of absolute values in the line width indication value errors at all the line width calibration points as a line width indication value error calibration result;
ΔLi＝Li-Li0 (1)
in the formula:
ΔLi-line width indication error, mm, at each line width calibration point of the measured borehole television imager host (80);
l is the line width indication value, mm, of the measured borehole television imager host (80) at each line width calibration point;
Li0-line width standard value, mm;
4) selecting-180 degrees, -135 degrees, -90 degrees, -45 degrees, 0 degrees, 45 degrees, 90 degrees, 135 degrees and 180 degrees as azimuth calibration points, controlling the rotating platform (10) to rotate to each azimuth calibration point in sequence by using a notebook computer (70), respectively reading and recording the inclination indication values at each calibration point displayed by the drilling television imager host (80), calculating the azimuth indication value errors according to the formula (2) by combining the inclination standard reference values measured by the gyroscope (50), and taking the maximum value of the absolute values in the azimuth indication value errors at all the azimuth calibration points as the azimuth indication value error calibration result;
Δθi＝θi-θi0 (2)
in the formula:
Δθi-azimuth error, degree, of the borehole video imager host (80) under test at each azimuth calibration point;
theta-the inclination readings, °, of the borehole television imager host (80) under test at each azimuthal calibration point;
θi0-a trend standard reference value, deg., measured by gyroscope 50;
5) selecting-30 degrees, -20 degrees, -10 degrees, -0 degrees, -10 degrees, -20 degrees and 30 degrees as inclination angle calibration points, controlling the inclination table (20) to sequentially incline to each inclination angle calibration point by using a notebook computer (70), respectively reading and recording inclination angle indication values at all inclination angle calibration points displayed by a drilling television imager host (80), calculating inclination angle indication value errors according to a formula (3) by combining an inclination angle standard reference value measured by a gyroscope (50), and taking the maximum value of absolute values in the inclination angle indication value errors at all the inclination angle calibration points as an inclination angle indication value error calibration result;
Δλi＝λi-λi0 (3)
in the formula:
Δλi-the inclination indication error, degree, of the measured borehole television imager host (80) at each inclination calibration point;
λ is the dip angle indication, degree, of the borehole video imager host (80) under test at each dip angle calibration point;
λi0-a reference value, degree, of inclination measured by the gyroscope (50).
CN202210434442.1A 2022-04-24 2022-04-24 Device and method for calibrating borehole television imager Pending CN114660084A (en)

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