DEVICE FOR DETECTION OF SCRAPER AND DIAGNOSTIC PIGS LOCATION IN PIPELINE Russian patent published in 2008 - IPC F17D5/06 F16L55/48 

FIELD: construction.

SUBSTANCE: suggested device is related to pipeline transport, in particular, to operation of main and field pipelines, and is intended for searching and detection of location of mobile scraper and diagnostic devices (pigs) that are stuck in water, gas and sewage pipelines from the surface, as well as monitoring of their passage. Device contains pipeline 1, transmitter 5 installed in the pig in tight container 4, and portable receiver 11, which is located above pipeline 1 on the surface 3 of soil 2. Transmitter 5 contains driving oscillator 6, generator 7 of modulating code, phase manipulator 8, power amplifier and radiating antenna 10. Receiver 11 contains receiving antenna 12, amplifier 13, detector (selector) 14 of phase-shift keying signals, phase doubler 15, the first 16 and the second 18 narrow band filters, phase divider 17 in two, the first 19 and the second 20 measurers of spectrum width, comparison unit 21, threshold unit 22, switch 23, the first 24, the second 25, the third 33 and the fourth 34 phase detectors, frequency divider 27, quartz filter 28, decoder 29, device 30 for control and indication, phase changer 31 for +30°, phase changer 32 for -30°, the first 35 and the second 37 units of subtraction, phase changer 36 for +90°.

EFFECT: increase of receiver noise immunity by means of narrow-band noises suppression

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