The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 12, 1988
Filed:
May. 21, 1986
Applicant:
Inventor:
Robert A Moore, Houston, TX (US);
Assignee:
Halliburton Company, Duncan, OK (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01V / ;
U.S. Cl.
CPC ...
324339 ; 324 / ;
Abstract
In an induction logging system supported on a sonde, an improved received signal processing system is disclosed. The sonde supports transmitting and receiving coils. The transmitter sends pulses at a frequency F.sub.1, normally 20 kilohertz. The receiver includes a frequency multiplier circuit driven with a frequency F.sub.2. The multiplier forms an output to a phase sensitive detector driven by a gating signal F.sub.3 where F.sub.3 =F.sub.1 -F.sub.2. This reduces error arising in the receiver.