Abstract: 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.

Abstract: A blade tip measurement system includes a case and a blade that rotates within the case, the blade having an outer blade tip surface that has a clearance distance from an inner surface of the case. A light source emits light along an optical path that is directed toward the outer blade tip surface by a lens, and the outer blade tip surface reflects the light back along the optical path. An optical interferometer generates an interference pattern using the reflected light, and a photoreceiver receives the interference pattern. A complex logic device determines the clearance distance of the blade tip surface from the inner surface of the case based on the interference pattern. The interferometer may be a Fabry-Perot optical interferometer formed using a window positioned between the lens and the blade tip surface, or a Michelson interferometer formed using a reference optical path. The system may alternatively include an optical time of flight measurement of the blade tip clearance.

Abstract: The present invention provides a sensor assembly for installation within an opening in a wall separating an interior cavity from an exterior. The sensor assembly includes an exterior housing and a cartridge including a sensor. When the cartridge is correctly positioned within the housing, a flow path is established from the interior cavity to the sensor supported within the cartridge. When the cartridge is not positioned within the housing, the flow path is blocked.

Abstract: The present invention provides a sensor assembly for installation within an opening in a wall separating an interior cavity from an exterior. The sensor assembly includes an exterior housing and a cartridge including a sensor. When the cartridge is correctly positioned within the housing, a flow path is established from the interior cavity to the sensor supported within the cartridge. When the cartridge is not positioned within the housing, the flow path is blocked.

Abstract: 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.