×

GEOPHONE HAVING IMPROVED DAMPING CONTROL

  • US 20110007608A1
  • Filed: 07/08/2009
  • Published: 01/13/2011
  • Est. Priority Date: 07/08/2009
  • Status: Active Grant
First Claim
Patent Images

1. A geophone (110) comprising:

  • a cylindrical magnet (114);

    upper and lower pole piece caps (116, 118) receiving the upper and lower ends of said magnet (114), respectively;

    a tubular outer cylindrical housing (120), said magnet (114) and upper and lower pole piece caps (116, 118) being coaxially received within and connected to said housing (120) and defining an annular region within said housing (120);

    a tubular bobbin (130) disposed in said annular region and movable in an axial direction with respect to said housing (1200;

    upper and lower coils (140, 142) wound about upper and lower longitudinal regions of said bobbin (130) that are adjacent to said upper and lower pole piece caps (116, 118), respectively, said upper and lower coils (140, 142) being electrically connected, whereby an electrical potential is induced in said upper and lower coils (140, 142) by movement of bobbin (130) with respect to said housing (120); and

    a third coil (150) wound about said bobbin (130), said third coil (150) itself forming a closed electrical circuit.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×