METHOD AND DEVICE FOR MARKING AND CONTROL OF INTRAPIPE OBJECTS Russian patent published in 2003 - IPC

FIELD: pipeline systems. SUBSTANCE: device for marking and control of intrapipe objects with help of low-frequency transmitter of electromagnetic oscillations located on side opposite to location of said device relative to pipeline wall. Device includes receiving-amplifying channel, signal envelope shaper, reference voltage shaper, variable threshold comparator, comparator state analyzer. Input of envelope shaper is connected to output of receiving-amplifying channel. Output of reference voltage shaper is connected to input of plant of comparator threshold value. Comparator signal input is connected to output of receiving- amplifying channel. Method of marking and control of intrapipe objects is characterized by the fact that in reception of electromagnetic oscillations, envelope is formed of electric oscillations corresponding to received electromagnetic oscillations. Amplitude of said electric oscillations is determined and compared with its threshold value. Data and/or control signals are generated corresponding to said electric oscillations whose amplitude exceeds the threshold value. Said threshold value is established as function of voltage or current intensity by said envelope. Embodiment of invention allows increase of efficiency of detection of intrapipe objects found in thick-walled pipes and increased of functional potentialities of use of transceiver under conditions of severe external parasitic electromagnetic effect in zone of operation, particularly, in zones of power lines and near industrial plants with high-voltage converters, electromechanical devices and/or systems with high consumed current, and where noise-signal ratio is high. EFFECT: higher efficiency of method and device. 9 cl, 2 dwg