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US 11,385,116 B2Granted
Ludion pressure measurement system
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorsAaron Wiest, Craig Andrew Macdougall
Life of this patent
Estimating the term…
Abstract
Systems and methods for pressure measurement are provided. A ludion with a trapped gas bubble floats between two liquids. Pressure acting upon the liquids causes the bubble to expand or contract, resulting in movement of the ludion which can be measured and correlated with pressure change. Pressure measuring device can measure pressures from 0.05 inHg to 110 inHg with a four-to-one Test Accuracy Ratio (TAR) without using mercury.
Claims10
A pressure measurement system comprising:
- a first container;
- a first liquid disposed within the first container;
- a second liquid disposed within the first container;
- and
- a second container formed with a cavity and an aperture, wherein the second container is disposed within the first container;
- wherein the cavity opens to an exterior of the second container through the aperture;
- wherein a gas is disposed within the cavity such that the gas is trapped within the second container by pressure;
- and
- wherein the second container includes a reflective section on an outer surface of the second container, the reflective section comprising a reflector configured to reflect laser light such that a laser interferometer can be used to measure any change in position of the second container when the second container rises or sinks due to expansion or contraction of the gas disposed within the cavity.
6 more elements
A method of measuring pressure comprising:
- providing a first container;
- pouring a first liquid and a second liquid into the first container, where the first and second liquids are immiscible and the first liquid floats above the second liquid;
- providing a second container formed with a cavity and an aperture extending from the cavity to an exterior top side of the second container;
- filling the cavity with the first liquid;
- inserting a predetermined amount of a gas in the cavity;
- submerging the first container within the first and second liquids wherein the aperture at the exterior top side of the second container is in contact with the first liquid;
- placing the first container in a space having an unknown pressure;
- and
- recording a displacement of the second container to determine the pressure of the space.
6 more elements
A method of measuring pressure comprising:
- providing a pressure measurement system comprising:
- a first container;
- a first liquid disposed within the first container;
- a second liquid disposed within the first container;
- and
- a second container formed with a cavity and an aperture, wherein the second container is disposed within the first container;
- wherein the cavity opens to an exterior of the second container through the aperture;
- wherein a gas is disposed within the cavity such that the gas is trapped within the second container by pressure;
- drawing down pressure in the first container to a vapor pressure of the first liquid for calibration;
- placing the first container in a space having an unknown pressure;
- and
- recording a displacement of the second container to determine the pressure of the space.
9 more elements
Dependencies are inferred from the claim text.