Hydrostatically compensated deep sea probe with shear strain gauges
First Claim
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1. A hydrostatically compensated soil resistance probe comprising:
- an elongated tubular body having a distal tip for insertion into a material;
a first load gate laterally arrayed around the tubular body at a first axial position, and a second load gate angularly offset from said first load gate at a second axial position, said first and second load gates configured to, upon application of an axial force to said tubular body, redirect said axial force to a shear force;
a shear sensor on said tubular body between said first and second load gates to measure said shear force; and
a sleeve member enclosing the shear sensor and the first and second load gates.
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Abstract
A hydrostatically compensated soil resistance probe includes a cylindrical body having a distal tip for insertion into a material, a plurality of load gates for transitioning an axial load on said cylindrical body to a shear load, and a plurality of shear load sensors to measure a transverse loading on said probe due to an axial loading. The axial loading can be the result of the resistance on the probe tip to the insertion of the probe in the soil, or the frictional forces acting on a friction sleeve as the probe passes through the soil.
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Citations
15 Claims
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1. A hydrostatically compensated soil resistance probe comprising:
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an elongated tubular body having a distal tip for insertion into a material; a first load gate laterally arrayed around the tubular body at a first axial position, and a second load gate angularly offset from said first load gate at a second axial position, said first and second load gates configured to, upon application of an axial force to said tubular body, redirect said axial force to a shear force; a shear sensor on said tubular body between said first and second load gates to measure said shear force; and a sleeve member enclosing the shear sensor and the first and second load gates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A hydrostatically compensated soil resistance probe for testing soil and comprising:
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an elongated probe body portion having an upper end and a lower end; a conical probe tip attached to the lower end of the probe body to be driven into said soil by an axial force; means for redirecting said axial force on said probe body portion to a shear loading; a sensor for measuring said shear loading; and a sleeve member enclosing said redirecting means and said sensor.
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12. A method for measuring the axial load on a hydrostatically compensated soil probe comprising:
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providing a probe having a tubular body and tapered tip; filling the probe with a non-conducting fluid at a pressure to match an external pressure on said probe; providing a load cell within said tubular body and immersed in said fluid, said load cell coupled to said conical tip to transfer a resistance of said soil to said load cell, said load cell configured with load gates at first and second axial positions, said load gates at said first axial position angularly offset from said load gates at said second axial position; configuring the load cell with shear sensors to measure a shear force on said load cell due to the resistance of said soil; providing a sleeve member enclosing the shear sensors and the load gates; driving the probe into the soil at a substantially constant rate; communicating signals from said shear sensors on said load cell to a computer; and converting the signals from said load cell to an axial load resulting from said resistance of the probe to said soil. - View Dependent Claims (13, 14, 15)
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Specification