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METHOD OF AND APPARATUS FOR MEASURING IN SITU THE FORMATION FACTOR

  • US 3,728,622 A
  • Filed: 09/28/1971
  • Issued: 04/17/1973
  • Est. Priority Date: 09/28/1971
  • Status: Expired due to Term
First Claim
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1. Apparatus for measuring in situ the formation factor at the interface of a body of water and a sediment comprising:

  • a. an insulating member of elongated shape having two opposed, substantially flat surfaces;

    b. a first counter electrode surrounding at least a portion of the circumference of said member and adapted to be in contact with the water and with the sediment;

    c. a second electrode disposed on one surface of said member and adapted to be in contact with the water;

    d. a third electrode disposed on the opposite surface of said member and adapted to be in contact with the sediment to be measured; and

    e. apparatus coupled to said electrodes and including an electronic oscillator for measuring the ratio of the resistance between said first and said third electrode on the one hand and that between said first and second electrode on the other hand, the smallest lateral dimension of said member extending beyond said third electrode being no less than the desired depth of penetration into the sediment of the alternating current generated by said oscillator, thereby to determine directly the formation factor.

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