A method and apparatus for monitoring vital signs, such as cardiopulmonary activity, using a ballistograph are provided. The method and apparatus may be used to monitor an infant sleeping in a crib, a patient in a hospital, a person with a chronic disease at home or in professional care, or a person in an elder-care setting.

A foot force acquisition apparatus includes a first connecting rod, a pressure signal acquisition board, a second connecting rod rotatably connected with the first connecting rod, and an air tube provided in the first connecting rod and the second connecting rod. An end portion of the second connecting rod is fixedly provided with an elastic foot pad. An air chamber is provided in the elastic foot pad. One end of the air tube is connected with the air chamber. The other end is connected with the pressure signal acquisition board. By providing the pressure signal acquisition board and providing the air chamber in the foot, the air tube spans a joint formed by the first connecting rod and the second connecting rod to acquire the internal pressure value of the air chamber, thus achieving the advantages of simple structure, low cost and high reliability.

The present invention relates to an apparatus and a method for measuring ground subsidence using a pressure gauge, in which the apparatus includes: a plurality of pressure gauges installed along a ground surface at a subsidence reference point of ground and a plurality of measurement positions to be measured, respectively, to measure a pressure displacement at each of the measurement positions; a pressure transmission pipe filled therein with a liquid supplied from a tank installed at the subsidence reference point to transmit a pressure to each of the pressure gauges; and a measurement terminal connected to each of the pressure gauges through an optical cable, and configured to convert the pressure displacement measured by each of the pressure gauges into a height displacement to measure an amount of the ground subsidence.

A micro pressure sensor includes a sense die mounted on a substrate, a ring structure encircling the sense die, and a silicone material is overmolded to an exterior of the ring structure to form a seal with the ring structure and fills an interior of the ring structure. The ring structure has one or more legs at bottom side, which are snap fitted to the substrate through mating holes such that the ring structure encircles the sense die; and a top surface of the silicone material receives the external pressure and transmits the external pressure to the sense surface of the sense die to generate an output signal on the sense die, wherein a processor converts the output signal into a pressure reading. The pressure-transmitting media transmits a received external pressure to the sense surface of the sense die to generate an output signal from the sense die, wherein a processor converts the output signal into a pressure reading.

Methods, systems, and apparatuses are provided for detecting and determining conditions of and conditions within a fluid conduit.

A connection structure for a fuel pressure sensor that connects a fuel pressure sensor for detecting a pressure of a fuel to a fuel rail in which the fuel to be supplied to an internal-combustion engine flows, includes a tubular attachment boss that is formed in the fuel rail and includes a male screw portion and an abutting surface, an attachment portion that is provided in a sensor body of the fuel pressure sensor, and includes a contact surface that abuts to the abutting surface and a bearing surface provided behind the contact surface, and a nut including a female screw portion that is screwed on the male screw portion and a pressing portion that presses the bearing surface to the abutting surface by screwing the female screw portion on the male screw portion.

A package-type flow sensor includes a flow sensor chip having a sensor part configured to detect a flow of fluid, a package including a flat board part, forming an accommodating chamber configured to accommodate the flow sensor chip, and a connection terminal, provided on an outer surface of the board part, and connected to an external board. Further, in this package-type flow sensor, the board part is provided with a first vent hole communicating to inside and outside of the accommodating chamber, the package is provided with a second vent hole communicating to the inside and the outside of the accommodating chamber, at a position different from the board part, and the flow sensor chip is disposed on a flow passage of the fluid formed by the first vent hole and the second vent hole.

A sensing device includes a body having a first chamber, a second chamber, and a liquid path which are filled with a liquid, the liquid path communicates with the second chamber, a pressure difference detection chip installed in the first chamber, and a pressure detection chip installed in the first chamber. The pressure difference detection chip seals an opening of the liquid path disposed on a bottom surface of the first chamber. The pressure difference detection chip detects a liquid pressure difference between the first chamber and the second chamber. The pressure detection chip detects a liquid pressure in the first chamber.

A number of devices are provided for detecting presence of ice in an airstream. In some examples such device includes a housing defining a first chamber and a second chamber, and a partition wall separating the first chamber and the second chamber. The first chamber has at least one inlet opening on a front housing wall facing the airstream, and at least one outlet opening, smaller than the at least one inlet opening. The second chamber is configured for being operatively coupled to at least one electromagnetic (EM) system that is configured for transmitting EM energy to the first chamber at least via the partition wall, which is transparent and/or translucent with respect to the EM energy, the EM energy being configured for melting ice that can accrete with respect to the inlet opening. The device is configured for being operatively coupled to at least one air pressure sensor in fluid communication with the first chamber for detecting at least pressure changes in the first chamber responsive to ice accretion on the inlet opening.

A fluid flow arrangement includes a manifold defining a fluid passage. A pressure sensor system is in fluid communication with the fluid passage. The pressure sensor system has a first sensor arranged along a first sense line and a second sensor arranged along a second sense line. The first and second sense lines are in fluid communication with the fluid passage. The first sense line has a first resonant frequency and the second sense line has a second resonant frequency. The second resonant frequency is different than the first resonant frequency.