201results about "Fluid pressure measurement using pressure-sensitive liquid" patented technology

An altitude measuring system is described that includes a radar altimeter configured to measure altitude and a digital terrain map database. The database includes data relating to terrain elevation and at least one data parameter relating to an accuracy of the terrain elevation data and the altitude measured by the radar altimeter. The system is configured to weigh an altitude derived from the terrain elevation data and the radar altimeter measurements according to the at least one data parameter.

An altitude measuring system and method for aircraft is provided. The altitude measuring system includes altitude sensors for providing data to an altitude processing unit. The altitude processing unit spatially averages each output to determine a mean altitude. Pitch and roll are accounted for by correction. A method of determining aircraft altitude from a plurality of altitude sensors includes receiving altitude sensor data from each sensor and spatially averaging the altitude sensor outputs to determine aircraft altitude. A method of estimating the maximum height of an ocean surface includes receiving a plurality of altitude sensor data and determining a mathematical description of the ocean surface from the sensor data. The maximum probable wave height of the ocean surface is estimated from the mathematical description. From the maximum wave height, a cruise altitude may be determined.

Methods, apparatuses, and non-transitory processor-readable media of the present disclosure are presented for efficiently executing applications based on pressure sensor data. In some embodiments, a method includes monitoring pressure, and determining a rate of change in the pressure over time exceeds a predetermined rate-of-pressure-change threshold. The method further includes subsequently determining that the rate of change in the pressure over time no longer exceeds the predetermined rate-of-pressure-change threshold. The method further includes determining a change in pressure has exceeded a predetermined pressure-change threshold, and performing floor disambiguation.

The invention relates to a time and location dependent atmosphere model and especially determining the altitude of a mobile terminal based on this model and the measured barometric pressure at the location of the terminal. The atmosphere model provides a long term, wide area barometric pressure model estimate.

On an upper surface of a container body, there are disposed at least a base portion of a concentration meter configured to detect the concentration of a liquid reducing agent based on a heat transmission characteristic between two spaced points, and a heat exchanger configured to permit the engine coolant to circulate therein and arranged to surround a detecting section of the concentration meter, which hangs from the base portion of the concentration meter via a supporting column thereof, to thereby perform the heat exchange with the liquid reducing agent, and also, a protector or an encasing element of substantially box shape is arranged to surround a lower portion of the heat exchanger and the detecting section of the concentration meter, and further, a visor is attached on the supporting column of the concentration meter, which is positioned above the protector by a predetermined interval.

The present invention relates to safety monitoring system, and is flexibility monitoring method for large span bridge structure. Whole bridge pressure field is first established with water tanks set in the unchanged location, water pipes set horizontally and city water supply system to lead water pressure to deformation location of the bridge; and the pressure transducer is fixed to the measured part. The pressure change is converted into flexibility change and monitored with the computerized monitoring system, which consists of water tank, water pipes, pressure transducer, A/D converter, computer, etc. The present invention has high measurement stability, great measurement range, low measurement cost and high practical value.

Altitude measuring devices such as barometers typically provide good differential reading yet poor absolute reading, mainly depending on dynamic weather conditions. Placed at the same altitude but on different days, a barometer based altimeter might show different altitude reading. Thus, such altimeters, when used for navigation by pilots and mountaineers, for example, require manual and timely calibration. The present invention discloses a method for automatic calibration of altitude measurement devices, such as barometers, in order to achieve good absolute readings yet avoid the present manual calibration. This method is particularly useful for indoors navigation.

A physical quantity sensor apparatus includes a physical quantity sensor including a flexurally deformable diaphragm including a pressure receiving surface and a temperature sensor disposed on the pressure receiving surface side of the diaphragm to be spaced apart from the diaphragm. The pressure sensor includes a hollow section, which is a pressure reference chamber, on a surface side opposite to the pressure receiving surface of the diaphragm.

Methods and apparatus for determining an altitude for a terminal device operating in a wireless telecommunications network including the terminal device and another network entity. The terminal device measures an indication of barometric pressure in its vicinity using a barometric sensor. The other network entity establishes calibration information, for the barometric pressure measurement, including a reference barometric pressure for a reference altitude and may come from a barometric pressure measurement at the other network entity or from meteorological data provided to the other network entity. The altitude relative to the reference altitude may then be determined from the difference between the barometric pressure measured by the terminal device and the reference barometric pressure, by the terminal device after receiving the calibration information from the other network entity and/or by the other network entity after receiving an indication of the barometric pressure measured by the terminal device.

A barometric-pressure-sensor device for a portable electronic device, having a pressure sensor of a MEMS type designed to supply a barometric-pressure measurement, and with a processing circuit coupled to the pressure sensor that is designed to supply an altitude measurement as a function of the barometric-pressure measurement. The pressure sensor and the processing circuit are integrated in a single chip, and the processing circuit is a dedicated circuit of a purely hardware type. The processing circuit executes altimeter-setting operations through a plurality of reference registers containing respective pressure references.

The invention discloses a U-shaped pressure meter and a pressure measurement method thereof. In the U-shaped pressure meter, the bottom of the U-shaped pressure meter is communicated with a liquid feed tank through a liquid feed pipe; the right pipe section of a U-shaped pipe extends in the horizontal direction into an overpressure overflow protection tank; the left pipe section of the U-shaped pipe is communicated with a high pressure measurement mouth pipe and a horizontal connection pipe, and a three-way valve is arranged at the joint of the left pipe section of the U-shaped pipe, the high pressure measurement mouth pipe and the horizontal connection pipe; the external end of the horizontal connection pipe is communicated with a horizontal escape pipe and a piston air measurement cylinder, and another three-way valve is arranged at the joint of the external end of the horizontal connection pipe, the horizontal escape pipe and the piston air measurement cylinder; and the volume scale is marked on the left pipe section of the U-shaped pipe. The pressure measurement method comprises the following steps of: disconnecting the high pressure measurement mouth pipe and the U-shaped pipe by the three-way valve; connecting high-pressure gas in the U-shaped pipe and the piston air measurement cylinder; and measuring the volume of high-pressure gas in the U-shaped pipe under normal pressure by using the piston air measurement cylinder and calculating to obtain pressure of the high-pressure gas. The invention has the characteristics that the measurement accuracy does not change along with the rise of pressure, and when the measurement pressure is higher, relative error is smaller.

The invention relates to a sensor that utilizes an electrical principle to measure a temperature and a pressure, more particularly to a compound type temperature pressure sensor. The sensor includes a pedestal, wherein a groove is arranged at the top of the pedestal; a convoluted diaphragm is fixed on the top of the pedestal by a clamping ring; space between the groove of the pedestal and the convoluted diaphragm is filled with silicon oil; and a pressure chip is arranged in the pedestal. Besides, the sensor is characterized in that: the pressure chip is connected with lead electrodes through gold wires; the lead electrodes pass through the pedestal and are extended out; a thermistor is fixed in the pedestal; and a fuel feed hole on the pedestal is sealed by a pin. According to the invention, a pressure and a temperature can be measured simultaneously; and a stainless steel diaphragm is used to realize isolation of a pressure induction chip, so that a using range is extended.

An improved regulating and gauging device for attachment to tank fed breathing apparatus used in such endeavors as scuba diving or fire fighting. On the body of the device are components which concurrently function to provide the diver or other user with a single source for what are conventionally, multiple components of a pressure gauge, a regulator, and a buoyancy compensating control unit. The device has mounted in or upon the device body, a mechanical or digital display of the remaining tank pressure in the attached supply tank, and thus breathable air supply. Also provided are an outlet to a buoyancy control bag, and a quick connect air supply port for another person to use in emergencies, or as needed. Additional utility is achieved by the provision of the pressure gauge which is mounted upon the exterior buoyancy compensating control unit body where the user can easily see it during use. Optionally a microprocessor fitted with software to calculate and display real time remaining air supply based on current usage levels may be provided when used with a digital electronic gauge.

A method, apparatus, and computer program product for accurately determining aircraft altitude, impact pressure, and calibrated air speed are provided. The determined results may be used for analysis in certification processes, used for building flight testing or simulation models that also may used in certification processes, or used for other purposes such as data to be used in a flight simulator. Altitude information of an aircraft is determined based on recorded altitude information generated by an inertial navigation system (INS) of the aircraft and altitude information generated by a global positioning system (GPS) of the aircraft. A static pressure value is generated based on the determined altitude information.

An apparatus and a method for measuring an altitude of a terminal which can correct an altitude error according to temporal and spatial changes are provided. The apparatus includes an atmospheric pressure measuring unit for measuring an atmospheric pressure from a barometer included in the terminal, a position determiner for measuring position information of the terminal, and a controller for, when a reference atmospheric pressure reception period is not generated, predicting a current reference atmospheric pressure by using previously received reference atmospheric pressures and measuring a current altitude by using the predicted reference atmospheric pressure and the measured atmospheric pressure.

The invention relates to a penetrating-stretching type pore water pressure measurement device and a measurement method thereof. A projecting segment of a taper penetration head is inserted into a filter pipe and is connected with the filter pipe through a screw thread or a pin. The filter pipe is externally provided with a sleeve pipe and is in sliding fit with the sleeve pipe. The sleeve pipe is tightly pressed on a shoulder of the sleeve pipe and the taper penetration head through a gasket. A bottom of a conduit is arranged on an upper end of the sleeve pipe through screw thread or nestification. According to the device and the method, problems that pore water pressure monitoring and measurement are complex and data is not direct in a saturated soft soil distribution region are solved, the device and the method are especially suitable for the pore water pressure monitoring and measurement of a fine grain soil layer with formation reasons of a fourth system river delta phase, an oxbow lake phase, a lake phase, a lagoon phase, a marsh phase and the like, measurement of a groundwater table, a perched water level and a confined water head of underground water, underground water monitoring, and water quality layered monitoring and sampling of an underground water environment. Compared with the prior art, the device has the advantages of simple structure, low cost, practicality and convenience, and the measurement method has the advantages of convenience, easy enforcement, convenient operation and reliable data.

The invention consists of a barometric pressure sensor, coupled to a processor for recording changes in the pressure over time, this is coupled to a GPS device providing an accurate measurement of the altitude which allows for the barometric pressure measurements to be normalized, typically to mean sea level. Once the measurements have been normalized the effects of the vertical motion of the sensor are effectively removed and the resulting trend shows the absolute atmospheric pressure which can then be used for weather prediction.

A heat conduction type barometric sensor has high sensitivity and high accuracy that has simple structure and circuit configuration and can measure a barometric pressure in the range of a very low barometric pressure to ≧1 atm using one sensor chip. The sensor includes a cantilever-shaped thin film provided with a thin-film temperature sensor, a heating element, and an excitation element. The excitation element utilizes warpage and bending based on a difference in thermal expansion between two main layers constituting the thin film during intermittent heating by a thin-film heater as the heating element. The two main layers are a silicon layer and a thermally oxidized film of silicon which are significantly different from each other in the coefficient of thermal expansion. A circuit in which the sensitivity is enhanced by the integration of a seebeck current for a predetermined period of time can be also provided.