A polymeric fluid sensor includes an inlet configured to receive fluid and an outlet. A polymeric tube is fluidically interposed between the inlet and the outlet and has a first sensing location with a first sidewall thickness and a second sensing location, spaced from the first sensing location, with a second sidewall thickness. A sleeve is disposed about the polymeric tube. The first sidewall thickness is less than the second sidewall thickness and a first sensing element is disposed at the first location and a second sensing element is disposed at the second location. In another example, the first and second sidewall thicknesses are the same and a fluid restriction is disposed within the polymeric tube between the first and second sensing locations.

A optical sensor assembly is disclosed that includes a sensor diaphragm configured to deflect responsive to an applied stimulus. The sensor assembly includes a first Extrinsic Fabry-Perot Interferometer (EFPI) having a first optical cavity in communication with at least a portion of the sensor diaphragm, the first EFPI is configured to interact with light to produce a combined measurement light signal and a first common-mode light signal, the measurement light signal corresponding to the applied stimulus. The sensor assembly also includes a second EFPI having a second optical cavity, the second EFPI is configured to interact with light to produce a second common mode light signal for error correction. The sensor assembly may further include a sensing optical fiber in communication with the first EFPI; a reference optical fiber in communication with the second EFPI; and a glass header configured to support the sensing optical fiber and the reference optical fiber.

An example system for non-invasive determination of target properties of a pressure vessel includes: a signal generator acoustically coupled to a fluid contained in the pressure vessel and disposed externally to the pressure vessel, the signal generator to emit acoustic signals into the fluid; a plurality of sensors acoustically coupled to the fluid and disposed externally to the pressure vessel to detect the acoustic signals; a control device interconnected with the signal generator and the plurality of sensors, the control device configured to: control the signal generator to emit acoustic signals into the pressure vessel; obtain sensor data from the plurality of sensors, the sensor data representing the acoustic signals as received by the plurality of sensors; compute, based on the detected signal data, the target properties of the pressure vessel; and output an indication of the target properties.

An example system for non-invasive determination of target properties of a pressure vessel includes: a signal generator acoustically coupled to a fluid contained in the pressure vessel and disposed externally to the pressure vessel, the signal generator to emit acoustic signals into the fluid; a plurality of sensors acoustically coupled to the fluid and disposed externally to the pressure vessel to detect the acoustic signals; a control device interconnected with the signal generator and the plurality of sensors, the control device configured to: control the signal generator to emit acoustic signals into the pressure vessel; obtain sensor data from the plurality of sensors, the sensor data representing the acoustic signals as received by the plurality of sensors; compute, based on the detected signal data, the target properties of the pressure vessel; and output an indication of the target properties.

A capacitance diaphragm gauge (CDG) assembly includes a CDG sensor positioned within a vacuum enclosure, which is maintained at a vacuum. The CDG sensor generates sensor signals responsive to a pressure of an applied gas. The vacuum enclosure provides thermal insulation around the CDG sensor. The CDG sensor is maintained at a selected operating temperature using an internal heater positioned on the CDG sensor. The internal heater is responsive to external heater control signals. The temperature of the CDG sensor is monitored using an internal temperature sensor mounted on the CDG sensor. The temperature sensor generates a temperature signal. The vacuum enclosure includes an end cap that seals the vacuum enclosure. Connectors positioned through the end cap communicate the sensor signals, the heater control signals and the temperature signals through the end cap. The connectors are hermetically sealed to the end cap to maintain the vacuum within the vacuum enclosure.

A pressure sensor which detects a combustion pressure of an engine includes: a contact part which is in direct or indirect contact with a casing of the engine when the pressure sensor is attached to the engine; and a pressure detection unit which detects the combustion pressure and outputs a signal corresponding to the combustion pressure, wherein the pressure detection unit includes a pressure detection element which detects the combustion pressure and outputs a signal, and a circuit unit which converts the signal obtained from the pressure detection element into a signal corresponding to the combustion pressure, and the pressure detection unit is provided at a location positioned more inside the engine than the contact part when the pressure sensor is attached to the engine.

A pressure sensor which detects a combustion pressure of an engine includes: a contact part which is in direct or indirect contact with a casing of the engine when the pressure sensor is attached to the engine; and a pressure detection unit which detects the combustion pressure and outputs a signal corresponding to the combustion pressure, wherein the pressure detection unit includes a pressure detection element which detects the combustion pressure and outputs a signal, and a circuit unit which converts the signal obtained from the pressure detection element into a signal corresponding to the combustion pressure, and the pressure detection unit is provided at a location positioned more inside the engine than the contact part when the pressure sensor is attached to the engine.

A pitot tube includes an outer tube extending from a first tube end to second tube end. The second tube end defines a tip portion of the pitot tube. A tube sleeve is located inside of the outer tube and defines a tube passage extending from the first tube end to the second tube end. A heating element is located between the outer tube and the tube sleeve. The heating element is isolated from airflow into the tube passage. A method of forming a pitot tube includes installing a heating element to an outer surface of a tube sleeve, the tube sleeve defining a tube passage of the pitot tube. The tube sleeve is secured in an outer tube such that the heating element is between the tube sleeve and the outer tube and is isolated from airflow through the tube passage.

A pitot tube includes an outer tube extending from a first tube end to second tube end. The second tube end defines a tip portion of the pitot tube. A tube sleeve is located inside of the outer tube and defines a tube passage extending from the first tube end to the second tube end. A heating element is located between the outer tube and the tube sleeve. The heating element is isolated from airflow into the tube passage. A method of forming a pitot tube includes installing a heating element to an outer surface of a tube sleeve, the tube sleeve defining a tube passage of the pitot tube. The tube sleeve is secured in an outer tube such that the heating element is between the tube sleeve and the outer tube and is isolated from airflow through the tube passage.

A temperature correction device includes a data acquisition portion that acquires physical quantity data based on an output signal from a physical quantity sensor and temperature data based on an output signal from a temperature sensor, a physical quantity measurement portion that measures a physical quantity detected by the physical quantity sensor based on the physical quantity data, a correction value calculation portion that calculates a correction value based on a product of a temperature gradient value for a first period from a first time to a second time obtained based on the temperature data and a correction coefficient value, and a correction portion that corrects a measurement value of the physical quantity measured by the physical quantity measurement portion based on the correction value.