摘要:
There is provided a barometric altimeter to detect a floor number at the current position in especially a high-rise building, and to calculate a height or a floor number more precisely. To this end, a barometric altimeter (100) stores, at a barometric pressure/height conversion coefficient storage unit (2), a plurality of barometric pressure/height conversion coefficients that is calculated beforehand based on temperature of air indoors in accordance with a month and a date, and an arithmetic expression, for which the plurality of barometric pressure/height conversion coefficients are used. For the actual operation, while a reference barometric pressure measurement/storage unit (1) measures and stores a barometric pressure at a position as reference barometric pressure, a current barometric pressure measurement unit (3) measures the barometric pressure at the position to be measured. Then a height calculation unit (5) calculates the height through predetermined calculation using the result of processing at these blocks.
摘要:
A barometer which is rotatable and a method of using a barometer which is rotatable is presented comprising a barometer tube retaining barometric fluid that is shorter than that required by non-rotatable barometers. The provision of a rotatable barometer allows the use of a barometric fluid of a density lower than that of mercury to be used, thereby enabling the use of mercury to be avoided.
摘要:
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.
摘要:
An analog pressure indicator assembly, particularly useful as a barometer, accurately indicates pressure or pressure changes using the fewest number of and/or least expensive components possible. The assembly is typically gearless, and includes a pressure sensitive element [e.g. aneroid chamber] having a first portion that moves in a path in response to pressure. A cam has a first curved surface and a second surface, and is mounted for rotation about a first axis, and the curved first surface operatively engages the pressure sensitive element. A force transmitting element, and a shaft mounted for rotation about a second axis spaced from the first axis, and a pointer operatively connected to the shaft, are also provided. The force transmitting element may be a strand, or a strand in combination with a bar or rod, and operatively connects the cam second surface to the shaft in order to cause the shaft to rotate about the second axis in response to the pressure sensitive element rotating the cam about the first axis. Preferably a torsion spring or the like biases the cam into operative engagement with the pressure sensitive element. The cam may comprise a roller, ball bearing, or section of a ball bearing, or it may comprise a curved surface and lever (forming the second surface of the cam) that are integrally formed. A scale and housing are also typically provided, the pointer mounted within the housing to move with respect to the scale. The movement of the pressure sensing element may be linear, but if non-linear the cam curved surface is shaped to transform the non-linear movement into substantially precisely accurate arcuate movement of the pointer with respect to the scale.
摘要:
A method of measuring absolute static pressure in a microfluidic device transporting a working fluid that is immiscible in a first selected gas environment, includes providing a first fluid conducting channel having an atmosphere provided by the first selected gas environment in a sealed environment and in communication with the microfluidic device at a first point of communication; providing a first sensing mechanism that is electrically interrogated, disposed adjacent to the first fluid conducting channel; and transporting the working fluid under pressure conducted by the microfluidic device into the first fluid conducting channel such that the volume transported into such first fluid conducting channel varies depending upon the absolute static pressure of the working fluid.
摘要:
The pressure of the atmosphere is sensed by a pressure transducer which causes a resistance to vary. The variance of this resistor is converted to a variable frequency. The number of cycles of this frequency in a set amount of time is counted by a counter and displayed by a digital display.
摘要:
A manometer for measuring liquid pressure having a channel which opens into an attaching device for connecting the channel to liquid under pressure, said attaching device including a conduit which provides a path of flow for said liquid into the channel. The conduit has a needle for introducing liquid into the conduit at one end thereof, a closure at the other end thereof which includes a valve or slit for opening said other end of the conduit to permit drainage of liquid therefrom, and an opening in said conduit through which liquid may enter the channel from the conduit. Liquid pressure is indicated by the amount of travel of the liquid in said channel.
摘要:
A timepiece for underwater use, includes a conventional movement arranged within a case and a manometer in the form of a resilient tube arranged in the space between the movement and the inner surface of the case. An open end of the tube communicates with ambient medium around the case and pressure variations in the tube are communicated to an indicator by means of a pin mounted on the opposite closed end of the tube. The pin is arranged between two legs at one end of the indicator.