Abstract: An installation for measuring the pressure of at least one tire of a wheel of an aeroplane includes: at least a pressure measuring sensor associated with a tire; a unit operating on the pressure measurement provided in the aeroplane; and radio-frequency transmission elements including for the or each sensor, a revolving antenna borne by the wheel and connected to each measuring sensor and to a fixed antenna connected by a conductive cable to the unit operating on the pressure measurement. The fixed antenna is adapted to be borne by the aeroplane structure away from the or each wheel at least in an upper part of the shock strut of the landing gear bearing the wheel.

Abstract: A fiber optic pressure sensor for measuring unsteady pressures within a pipe include at least one optical fiber disposed circumferentially around a portion of a circumference of the pipe, which provides an optical signal indicative of the length of the optical fiber. An optical instrument measures the change in length of the optical fiber to determine the unsteady pressure within the pipe. The pressure sensor may include a plurality of optical fiber sections disposed circumferentially around a portion of the circumference of the pipe that are optically connected together by optical fiber sections disposed axially along the pipe. The optical fiber sections may include fiber Bragg gratings having substantially the same or different reflection wavelengths to permit for example the sensors to be axially distributed along the fiber using wavelength division multiplexing and/or time division multiplexing.

Abstract: A new and versatile ultra-miniature pressure sensor comprises a very thin diaphragm of approximately one micron or less, e.g., 0.2 microns. In some embodiments, the diaphragm has a radius of 20 microns and the pressure sensor can detect signals at or near 0.1 Atm with 1% accuracy. The diaphragm is formed by epitaxial growth of silicon or by bonding and etching. A plurality of high sensitivity piezoresistive strain gauges measure strain of the diaphragm. Less than 0.1 microns thick, the piezoresistive strain gauges are embedded in the diaphragm by ion implantation or formed thereon by epitaxial growth. The ability to form ultra-thin piezoresistive layers on very thin diaphragms enables the miniaturization of the pressure sensor as well as any device that employs it.

Abstract: The invention provides a pressure detection indication device with a simple structure. The pressure detection indication device 1 comprises a main body 11 having an internal space 111 of the body communicating with a space to be subjected to pressure detection, a case 12 having an internal space 121 of the case communicating with a space different from that communicated with the internal space 111, a diaphragm 14 airtightly separating the internal space 111 of the body from the internal space 121 of the case, an indication mark disposed on the diaphragm and placed in the internal space of the case, a lens 13 disposed within the case, a stopper member 15 attached to the diaphragm 14, a biasing means 17 for biasing the diaphragm 14 toward the lens, and a stopper receive surface 117 provided in the internal space 111.

Abstract: A pressure transducer for a hydrogen reciprocating compressor in a sour gas environment includes a sensor head including a diaphragm mounted on a free end of the sensor head. The diaphragm is constructed of a nickel-based alloy with gold plating on an exposed side thereof. A method of monitoring line pressure in a reciprocating hydrogen compressor in a sour gas environment includes a) providing a pressure transducer having a sensor head and a diaphragm located flush with a free end of the sensor head composed of a nickel-based alloy; b) applying a noble metal plating to one side of the diaphragm; and c) mounting the pressure transducer in a reciprocating compressor with the one side exposed to the sour gas.

Abstract: A pressure transducer with a capillary tube filled with a fluid for high pressure measurements. The pressure transducer has a sensitive element formed with a bore defining a cylindrical sensitive chamber, and respective capillary tubes attached to either ends of the sensitive element in fluid communication with the sensitive chamber. Advantageously, each capillary tube has a respective end outside threaded to engage in a mating thread-way provided in the sensitive element; moreover, a perimeter weld is provided for safety around each capillary tube near the connection to the sensitive element.

Abstract: A method for synthetically calculating redundant attitude and redundant heading for an aircraft using data existing in the aircraft, including angular rates p, q, r around x-, y- and z-coordinates of an aircraft-fixed (body frame) coordinate system, air data information including speed, altitude and angle of attack, includes the steps of calculating attitude and heading based on the body-frame angular rates p, q, r, estimating errors in measured body-frame magnetic field vector components, deriving a measured body-frame field magnetic field vector, estimating errors in calculated attitude and heading using the air data and the derived measured body-frame magnetic field vector components, and correcting the calculated attitude and heading using the estimated errors in attitude and heading.

Abstract: A pressure sensor apparatus is substantially miniaturized by utilizing dead space. A sensor element is arranged to be present in a medium for detecting the pressure of the medium. A control element serves to control an electric signal from the sensor element, and a power supply element serves to control an input from the power supply and a signal from the control element thereby to generate an output. A lead frame has the control element and the power supply element mounted thereon and serves as an electrical conduction path. A resin body is formed by integrating the control element, the power supply element and the lead frame with one another. Either one of the sensor element, the control element and the power supply element is arranged on one side surface of the lead frame, and the remaining two are arranged on the other side surface of the lead frame.

Abstract: The invention relates to a pressure sensor (1) with a housing (2), a sensor device (4), a sensor fastening device (8, 8b) for fastening the sensor device (4) onto and/or in the front area of the housing (2), and a seal (7) for sealing the transitional area between the housing (2) and the sensor device (4), where the housing (2) exhibits an inside housing wall (2W) and the sensor device (4) exhibits an outside sensor device wall (4W), such that the housing wall (2W) and the sensor device wall (4W) run in adjacent fashion one to the other and exhibit between the housing wall (2W) and the sensor device (4W) a reception space (6) for receiving the seal (7).

Abstract: A pressure sensor includes a casing having a pressure detection chamber, a diaphragm for receiving pressure of a measuring object and disposed on the casing, and a pressure detection element. The pressure detection chamber is filled with a liquid, and the diaphragm contacts the liquid. The pressure detection element is disposed in the pressure detection chamber to receive the pressure of the liquid. The diaphragm has a plate shape with a radius of R and includes a circumference and a center of the plate. The circumference is fixed to the casing. The diaphragm further includes a corrugate disposed concentrically with the center of the diaphragm and having a half circular cross-section and a top of the half circle. The top of the corrugate is disposed within a distance of 0.6 R from the center of the diaphragm.

Abstract: A tire sensor system for the continuous measurement of the transferred force and of the adhesive friction potential ?, made up of a plurality of sensors situated on the outer circumferential surface of the tire, via which measured variables are picked off and may be supplied as signals to an analyzing unit via an antenna system, in the area of the outer circumferential surface of the tire, a plurality of individually identifiable sensors is situated in each sector that corresponds to the tire contact area, the sensors making it possible to measure mechanical stresses locally in each position of the tire even when it is standing still, thus making it possible to determine the instantaneous force distribution in the tire.

Abstract: A resistance heater 134 for detecting an air flow rate is supported by support members 134A, 134B. A housing 110 contains an electronic circuit 140 connected to the resistance heater 134. The housing 110 is formed by integral molding with a terminal 142 for connecting the electronic circuit 140 to an external device. The terminal 142 is formed integrally with the housing 110. The housing 110 has a groove 112 through which the terminal 142 is exposed in part.

Abstract: A tire monitoring assembly is used with a wheel and tire assembly having a wheel rim, with the wheel rim including a mounting hole. The tire monitoring assembly includes a sealing grommet having an inner sealing ring, an outer sealing ring, and a main body extending between the inner sealing ring and the outer sealing ring, with the inner sealing ring being pressed through the mounting hole. The assembly also includes a fastener having a head and a shank extending from the head, with the shank extending through a fastener hole in the sealing grommet. A mounting member has a fastener through hole that receives the shank therethrough, a generally semi-spherical surface extending about a first end of the fastener through hole, and a recess extending about a second end of the fastener through hole that receives the inner sealing ring.

Abstract: A method of detection of a run-flat condition of a vehicle tire, said tire being mounted on a wheel, wherein: a quantity f(?, t) is sensed, which varies which the angular displacement of the wheel in time; measuring signals are elaborated, which vary with the angular speed of the wheel d?(t)/dt; a quantity characteristic of the dispersion of measuring signals is calculated; an alarm is set off when the characteristic quantity satisfies a given ratio.

Abstract: The present invention is related to a semiconductor pressure sensor device employed for an application of a micro pressure and includes a thin part constituting a diaphragm, a thick part surrounding the thin part, a strain gage element formed on a surface of the diaphragm in a side of the one main surface, for detecting a pressure, a semiconductor sensor substrate having a first concave part formed by the thin part and the thick part, having an opening part in the other main surface, and whose bottom part corresponds to the thin part, and a support member comprising a second concave part and the support member is fixed on the thick part of the semiconductor sensor substrate in a side of the other main surface so that an opening part of the second concave part faces with the opening part of the first concave part and has a positional relationship to be included in the opening part of the first concave part in a plane view.

Abstract: The present invention provides a spark plug coil and pressure sensor assembly for providing a spark to a cylinder of an internal combustion engine. The assembly comprises a spark plug configured for mounting in a cylinder and a pressure sensor associated with the spark plug configured to detect a pressure in the cylinder and generate a pressure signal in response thereto. The assembly includes a first electrically conductive ring connector configured to receive the pressure signal and a housing having a main axis and having at least one electrically conductive leaf spring member. The leaf spring member is configured to resiliently engage the first electrically conductive ring connector over a first predetermined circumferential angle relative to the main axis of the coil housing.

Abstract: A capacitive pressure sensor and its manufacturing method can simplify the alignment and the bonding process in a vacuum, and stably carry out the bonding process. The capacitive pressure sensor includes an insulating, first substrate with a capacitance electrode, a second substrate which has a diaphragm electrode so as to separate a vacuum chamber and a pressure-measuring chamber on respective surfaces, and an insulating, third substrate with a gas inlet. The substrates are bonded in a manner that the capacitance electrode faces the diaphragm electrode and the pressure-measuring chamber leads to the gas inlet. In addition, a getter chamber is formed in the same surface of the second substrate as the pressure-measuring chamber, and the getter chamber is connected to the vacuum chamber.

Abstract: An elastic member attaches a sensor device having a sensor protrusion portion into a through hole of a sensor attachment member in such a manner that the elastic member is temporarily assembled onto the sensor protrusion portion and inserted together with the sensor protrusion portion into the through hole. The elastic member includes a hollow portion and a rear end portion having a rear end flange and a bead portion. The rear end flange protrudes from an outer circumferential surface of the rear end portion for locking on a peripheral portion of one end of the through hole. The bead portion is elastically deformable and protrudes from either or both of one surface of the rear end flange facing the sensor device and the other surface of the rear end flange facing the sensor attachment member.

Abstract: A tire parameter sensing system (12) for a vehicle (10) having a tire (16) comprises a tire-based unit (26) associated with the tire (16) and including structure (70, 72) for sensing a parameter of the tire (16) and for transmitting a parameter signal (38) indicative of the sensed parameter. The parameter signal (38) having at least first and second different signal characteristics. The tire parameter sensing system (12) also comprises a vehicle-based unit (34) having a first receiving channel (116) for receiving at least portions of the parameter signal (38) that include the first signal characteristic and a second receiving channel (118) for receiving at least portions of the parameter signal (38) that include the second signal characteristic. A signal detection portion (120) of the vehicle-based unit (34) is responsive to the first and second signal characteristics for determining the sensed parameter of the tire (16).

Abstract: A work transferring and transporting apparatus has a plurality of transportation tables. A plurality of work holders for holding works are formed on the respective peripheral edge portions of the transportation tables. Each work is transferred between each pair of adjacent transportation tables and transported. A work transfer section is provided between the adjacent transportation tables. The adjacent transportation tables continuously rotate in synchronism with each other. In the work transfer section, the work having so far been held in one of the work holders of the one transportation table is transferred to one of the work holders of the other transportation table.