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Apparatus for measuring the distance to the floor of the cargo hold of a ship through intervening bulk material

  • US 4,070,625 A
  • Filed: 09/14/1976
  • Issued: 01/24/1978
  • Est. Priority Date: 09/14/1976
  • Status: Expired due to Term
First Claim
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1. Apparatus for measuring the distance to the floor of a large magnetically permeable container such as the cargo hold of a ship through intervening bulk material including a dipole field generating magnetic field radiator, a dipole field sensitive receiver antenna, said field radiator and receiver antenna being displaced from one another in a direction parallel to the floor of the cargo hold by a distance d at least equal to the dimensions of the radiator with the axis of the field of one parallel to the floor of the cargo hold and displaced therefrom a distance D which distance is the same order as d and with the axis of the field of the other intersecting and perpendicular to the axis of the field of the first and substantially perpendicular to the floor of the cargo hold, anda receiver circuit connected to the receiver antenna including a log converter for generating from the perturbations in said magnetic field produced by the magnetically permeable floor of the cargo hold and detected by the receiver antenna, a signal proportional to the distance D.

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