Parker-hannifin Corporation

Ronald W Bueter

Howard Austerlitz

Lewis Boyd

Stanley Wood

Lenard Hirshman

Stan Wood

A fluid level measurement system includes a first pressure sensor disposed inside a fluid tank at a first elevation relative to a height axis of the fluid tank, and a second pressure sensor disposed inside the fluid tank at a second elevation relative to the height axis of the fluid tank, the second elevation different from the first elevation. The first pressure sensor and the second pressure sensor are configured to provide a signal indicative of a sensed pressure, and fluid height is calculated from the difference in sensed pressure between the first and second pressure sensors relative to the sensed pressure of either the first or the second pressure sensor.

Aircraft fluid gauging techniques using pressure measurements and optical sensors

A gas measuring method, apparatus and system for measuring a concentration of a gas of interest is disclosed. The gas concentration is based on a propagation delay of a sonic or ultrasonic wave as the wave travels through the gas. The propagation delay is measured such that delay contributions from sources other than the gas itself are canceled. A sensor in accordance with the invention includes an sonic or ultrasonic transmitter and receiver, and a control module for performing calculations. The sensor can be used in various applications, including on-board inert gas generating systems (OBIGGS).

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Cary, NC, United States of America

Ronald W Bueter