METHOD AND DEVICE FOR CONTACTLESS SHELL DIAGNOSTICS OF UNDERGROUND PIPELINES Russian patent published in 2014 - IPC G01N27/82 

FIELD: machine building.

SUBSTANCE: essence of the invention consists in use of a new navigation system including a sensor unit that consists of two groups. Each group includes three single-component sensors; besides, similar axes of sensors are parallel while axes of sensors of each of the groups are orthogonal; besides, axes of two sensors in each of the groups are parallel to each other and to direction of movement and located in horizontal plane. Measurement of components of a variable magnetic field is performed continuously; angles of rotation and inclination of the sensor unit, as well as a value of offset of the sensor unit from a projection of pipeline axis are calculated based on measured components. Commands to the operator are supplied in the form of voice instructions using the language with which the operator is familiar based on comparison of signals corresponding to angles of rotation and inclination, as well as values of offsets as per the pre-determined threshold values of those signals. Information on technical state of the pipeline is received based on ratios of orthogonal components measured along horizontal and vertical axes of each of the groups.

EFFECT: improving accuracy of a routing method; reducing power consumption of the device and increasing labour intensity of the operator at use of the proposed method and device.

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