A pressure change measuring apparatus and a pressure change measuring method are capable of detecting a change in pressure to be measured with respect to a time axis with high accuracy. The pressure change measuring apparatus includes a reference value setting unit that generates a reference value signal based on an output signal of a differential pressure measuring cantilever under a predetermined state and outputs the reference value signal. An arithmetic processing unit calculates the pressure change in the pressure to be measured based on the output signal, the reference value signal, a volume of a cavity, and a flowing quantity of a pressure transmission medium flowing into and out of the cavity for every unit of a predetermined time period.

A method of measuring a hydrogen diffusivity of a metal structure is provided. The method includes providing a hydrogen charging surface at a first location on an external surface of the structure, and a hydrogen oxidation surface at a second location adjacent to the first location on the external surface of the structure. A hydrogen flux is generated and directed into the metal surface at the charging surface. At least a portion of the hydrogen flux generated by the charging surface and diverted back toward the surface is detected, and a transient of the diverted hydrogen flux is measured. The hydrogen diffusivity of the metal structure is then determined based on the measured transient.

A method of measuring a hydrogen diffusivity of a metal structure is provided. The method includes providing a hydrogen charging surface at a first location on an external surface of the structure, and a hydrogen oxidation surface at a second location adjacent to the first location on the external surface of the structure. A hydrogen flux is generated and directed into the metal surface at the charging surface. At least a portion of the hydrogen flux generated by the charging surface and diverted back toward the surface is detected, and a transient of the diverted hydrogen flux is measured. The hydrogen diffusivity of the metal structure is then determined based on the measured transient.

A hybrid pressure and flowguage regulator apparatus includes a regulator body, an inlet, and an outlet assembly. The outlet assembly includes a first orifice of a first size, a second orifice of a second size that is larger than the first size, and a mechanism that automatically moves the first orifice between a first position and a second position. When the first orifice is in the first position, the flow of gas passes through both the first orifice and second orifice. When the first orifice is in the second position, the flow of gas bypasses the first orifice and flows through the second orifice with a specific flow rate or a second pressure that is less than the first pressure. The apparatus may also include a gauge that provides a visual indication of both the specific flow rate and the second pressure.

Disclosed is a sensor to measure a pressure in a fluid, of which a body 1 includes a membrane 2 and a wall 3 forming a peripheral support for and around the membrane. The membrane and the peripheral wall are formed from one single component, and the membrane and the peripheral wall together form a flat and smooth front surface 4 intended to be in contact with the fluid.

A pressure gauge structure contains: a body having a bow-shaped frame and a holder mounted under the bow-shaped frame, and a contact film defined between the bow-shaped frame and the holder. A connector is connected on a bottom of the holder, and a test conduit passes through the holder and the connector and accommodates a tested object. The contact film contacts with a separation washer corresponding to the contact film.

A pipeline for conveying concrete determines a pressure in and/or a wall thickness of the pipeline, wherein a first length portion of the pipeline has a first wall thickness and a second length portion of the pipeline has a second wall thickness greater than the first wall thickness. The determination is made using a first strain gauge on an outer side of the first length portion and a second strain gauge on an outer side of the second length portion, wherein the strain gauges are each fixedly applied to the outer side of the length portions. A strain gauge and/or the second longitudinal section of the pipeline are/is at a spacing from at least one end of the pipeline, which spacing corresponds to at least an internal diameter of the pipeline. By comparing strain gauge measurements, the wall thickness is determinable.

The disclosure relates to a sealed pressure container, which solves the problem in the prior art that a pump is required for providing air pressure in the container. The conventional product is inconvenient for carrying and is expensive. The sealed pressure container includes a body and a winding member. The body has an open end and a flexible portion, the flexible portion is at least one part of the body at one side where the open end is formed. The flexible portion can be wound around the winding member from the open end to provide air pressure in the body by compressing the air inside the body. Thus, without using a pump, tennis balls can be prevented from releasing pressure by keeping in the low-cost sealed pressure container. The sealed pressure container is convenient for carrying and operating and has reduced manufacture cost.

A pressure sensing device including a light source, at least one resonant structure, a cladding body, a first substrate and a second substrate is provided. The light source is configured to provide an original broadband light. The resonant structure includes a plurality of semiconductor rod structures arranged into a row at intervals along a single arranging direction, and each of the semiconductor rod structures has a lattice constant on the arranging direction. The original broadband light is transmitted between the semiconductor rod structures, and a resonant light is produced, wherein each of the semiconductor rod structures has a length perpendicular to the arranging direction and has a width parallel to the arranging direction, the length and the width are less than the wavelength of the resonant light. The cladding body completely covers the semiconductor rod structures of the at least one resonant structure. The cladding body and the at least one resonant structure are interposed between the first substrate and the second substrate. When a pressure is applied on at least one of the first substrate and the second substrate, the pressure is transmitted to the cladding body along a direction perpendicular to the arranging direction, a deformation corresponding to the pressure is occurred on the cladding body and the semiconductor rod structures on the arranging direction, and a wavelength of the resonant light is changed according to the deformation. Besides, a pressure sensing apparatus is also provided.

An electronic control brake system for a vehicle, comprising: a pressure sensor connected to an electronic control device for electrically controlling a brake hydraulic pressure and sensing the brake hydraulic pressure generated in a master cylinder, the electronic control device includes a PCB separated from the pressure sensor, and an elastic connecting body of a conductive material provided on the PCB, the pressure sensor includes a sensor housing, a sensing portion provided inside the sensor housing for sensing the brake hydraulic pressure, and a lead portion of inelastic and conductive material and having a first end electrically connected to the sensing portion while passing through the sensor housing and a second end exposed to the outside and electrically connected to the electronic control device.