Method for transmitting very low frequency signal of oil-vapor pipe magnet leakage detector

Abstract

The invention provides a method for transmitting the very low frequency signal of an oil-vapor pipe magnet leakage detector. A pipe inner part is driven by a driving device to move at constant speed in an oil-vapor pipe; the magnet leakage data detected by a magnetic sensor detecting unit is sent to a data processing unit to be subjected to classification, compression and defect quantification and then is stored temporarily; the magnet leakage data which is stored temporarily and the mileage wheel count are transmitted to a microcontroller in a SCM at set intervals; after being subjected to power amplification and DA conversion, the magnet leakage data and the mileage wheel count are transmitted into a transmitting coil, and different types of data in the oil-vapor pipe is outputted; the electromagnetic pulse is received by a magnetic-induction receiving antenna set, after the voltage of the electromagnetic pulse is extracted and is sent to a data decompressing unit, the data in the oil-vapor pipe is restored in the time interval, and the condition and the position of the defect in the oil-vapor pipe are further determined. The compressed data stored for some time, the defect quantification data and the mileage wheel information can be transmitted into a receiving device on the ground, the information on the defect in the oil-vapor pipe can be analyzed and determined in time, and the efficiency of detecting the defect in the oil-vapor pipe can be improved.

Description

(1) Technical field [0001] The invention relates to a very low frequency signal transmission method of an oil and gas pipeline magnetic flux leakage detector, in particular to the technical field of communication. (2) Background technology [0002] Most of the long-distance oil pipelines in service in my country have been in operation for decades, and now they have entered the stage of frequent accidents. In order to prevent malignant accidents such as pipeline corrosion, perforation, leakage and pollution, it is necessary to regularly detect and clean them. Therefore, various pipeline detectors emerge at the historic moment, among which the magnetic flux leakage pipeline detection device is most widely used. Under normal circumstances, the pipeline magnetic flux leakage detector operates in the oil pipeline. The data information in the pipeline is detected by the magnetic sensor probe, and the data is sent to the data storage unit after data processing. After the pipeline ...

AI Technical Summary

Problems solved by technology

Under normal circumstances, the pipeline magnetic flux leakage detector operates in the oil pipeline. The data information in the pipeline is detected by the magnetic sensor probe, and the data is sent to the data storage unit after data processing. After the pipeline detector runs in the pipeline, it takes out the data detected in the whole process. , carry out data analysis, and then determine the defects in the pipe, so it is impossible to determine the defects in the pipe in time, and in the case of the limited volume of the pipe detector, certain requirements are put forward for the capacity of the storage unit

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