Title: Ground measuring method of metal pipeline loading current underground
Application Number: 200610038789 Application Date: 2006.03.13
Publication Number: 1818716 Publication Date: 2006.08.16
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G01V3/08
Applicant(s) Name: Nanjing Polytechnic Univ. Address: 210009
Inventor(s) Name: Sun Shirong
Attorney & Agent: shen genshui
Abstract:
     A ground measuring method of current loaded on underground metal pipeline includes loading AC signal with certain frequency on underground pipeline to confirm right-up position of said pipeline; measuring magnetic field intensity of said pipeline by top and bottom coils and converting it to be relevant two path AC voltage signal ;obtaining relevant DC voltage signal via preamplifier, switch capacity frequency-selective amplifier, rectifying circuit and signal nursing circuit; converting it to be digital amount ,sending the second digital amount to divider for obtaining quotient being sent to be the first multiplier ,the second multiplier ,third multiplier and a filter for obtaining current value loaded on said pipeline .
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