Method and device for correcting azimuth of borehole television probe under ferromagnetic interference

Abstract

The invention discloses a method for correcting azimuth of a borehole television probe under ferromagnetic interference. The method comprises the following steps: (1), if a three-axis rotation angle measured by a three-dimensional electronic compass does not exceed a preset positive threshold, utilizing the three-axis rotation angle measured by the three-dimensional electronic compass as an azimuth angle, and if the three-axis rotation angle measured by the three-dimensional electronic compass exceeds the preset positive threshold, performing a step (2); (2), obtaining a three-axis rotation angle rate measured by a three-axis gyroscope, utilizing the measured three-axis rotation angle rate to perform integral computation to obtain a change value of a three-axis rotation angle; (3), utilizing the change value of the three-axis rotation angle of the three-axis gyroscope and the computational initial value of a three-axis rotation angle of the three-axis gyroscope to obtain a corrected azimuth angle under a three-dimensional electronic compass coordinate system at the current time; (4), continuously judging, if the three-axis rotation angle measured by the three-dimensional electronic compass is not lower than a preset negative threshold, continuously performing the step (3) and taking the corrected azimuth angle as a to-be-used azimuth angle, and if the three-axis rotation angle measured by the three-dimensional electronic compass is lower than a preset negative threshold, utilizing the three-axis rotation angle measured by the three-dimensional electronic compass as the azimuth angle for use.

Description

technical field [0001] The invention belongs to the technical field of borehole imaging, and more specifically relates to a method and device for correcting the orientation of a borehole TV probe when it is subjected to ferromagnetic interference, which can correct the orientation measurement of the borehole TV probe in a ferromagnetic material. Background technique [0002] Borehole TV imaging method is a new geological detection method. Compared with traditional detection methods such as drilling coring and ultrasonic detection, it has the advantages of intuitiveness, high efficiency, powerful functions, and convenience, and has been widely used. However, in The foundation pile detection and pipe pile detection of large buildings such as houses and bridges have not been widely used. An important reason for this situation is that in actual engineering, especially in the foundation survey process of reinforced concrete structures When the probe of the borehole imaging device...

AI Technical Summary

Problems solved by technology

[0003] In view of the above defects or improvement needs of the prior art, the present invention provides a method for correcting the azimuth of the borehole TV probe when it is subjected to ferromagnetic interference. , so as to solve the technical problem that the measured azimuth angle of the borehole TV probe is wrong when it is close to the ferromagnetic material

Images