摘要:
The invention relates to a pressure sensor having a ceramic diaphragm which is exposed at one of opposite surfaces thereof to a measurement fluid in an external space and deformable in response to a pressure of the measurement fluid, and a strain detector for producing an electrical output representative of an amount of deformation of the ceramic diaphragm. The ceramic diaphragm is fixedly supported at an outer portion thereof, so that a central working portion of the diaphragm is deformable in response to the pressure of the measurement fluid applied thereto. The sensor includes a baffling structure disposed adjacent the above-indicated one surface of the ceramic diaphragm. The baffling structure has portions which partially define a chamber to which the above-indicated one surface of the ceramic diaphragm is exposed. The baffling structure has at least one communication hole for communication between the chamber and the external space, such that the central working portion of the ceramic diaphragm is protected against direct exposure to a straightforward flow of the measurement fluid from the external space toward the central working portion of the diaphragm.
摘要:
A particle sensor includes a flow path of a fluid, having a fluid inlet and a fluid outlet, and a sensor element provided in said flow path, which comprises (a) a vibrating section having such a mass that is sensitive to the collision of solid particles contained in the fluid, with the vibrating section and (b) a detecting section for detecting the vibration of the vibrating section caused by said collision and converting the vibration to electric signals. The sensor has a means capable of selectively detecting any vibration of the vibrating section having a frequency higher than the primary resonance frequency of the sensor element. This particle sensor has improved sensitivity to solid particles and can distinguish the signals generated by collision of solid particles, from the signals generated by collision of bubbles, at a high accuracy.
摘要:
A pressure sensor having a ceramic pressure sensing element including a bottom wall serving as a diaphragm, and a tubular wall which extends from a periphery of the bottom wall and cooperates with the bottom wall to define a cavity. The diaphragm has resistors formed thereon. The resistors are electrically connected to an external electric device by electrically conductive members. The sensing element is held in a housing by a retainer member such that one end of the retainer member is aligned with an end face of the tubular wall remote from the bottom wall. A biasing member is provided for biasing the retainer member toward the ceramic pressure sensing element, to exert a retaining force to the sensing element.
摘要:
A method for detecting the solid particles contained in a fluid, by the use of a particle sensor having a flow path of a fluid, having a fluid inlet and a fluid outlet, and a sensor element provided in the flow path, which comprises (a) a vibrating section having such a mass that is sensitive to the collision of solid particles contained in the fluid, with the vibrating section and (b) a detecting section for detecting the vibration of the vibrating section caused by the collision and converting the vibration to electric signals. The method includes steps of: passing a fluid to be examined, through the particle sensor, selectively detecting, from the electric signals outputted from the particle sensor, an electric signal portion having particular frequencies ranging from 1/50 to 10 times the primary resonance frequency of the sensor element, measuring the maximum amplitude of the electric signal portion, comparing the maximum amplitude measured above, with a given value predetermined with the particle sensor based on (1) the maximum amplitude of a portion of the electric signals caused by the collision of solid particles contained in a fluid, having the above particular frequencies and (2) the maximum amplitude of a portion of the electric signals caused by the turbulent flow of the same fluid containing no solid particles, having the above particular frequencies, and judging, depending upon the result of the above comparison, whether or not the electric signals outputted from the particle sensor with the fluid to be examined have been caused by the collision of solid particles with the particle sensor.
摘要:
A ceramic compact is provided having a patterned conductor is obtained by coating the patterned conductor with a slurry and then hardening the slurry. The slurry is prepared by mixing a thermosetting resin precursor, a ceramic powder, and a medium. In the ceramic compact, an isocyanate- or isothiocyanate-containing gelling agent and a hydroxyl-containing polymer are reacted and hardened to produce a thermosetting resin. The hydroxyl-containing polymer is preferably a butyral resin, an ethylcellulose-based resin, a polyethyleneglycol-based resin, or a polyether-based resin.
摘要:
In piezoelectric/electrostrictive elements, electrode layers have respective ends projecting outwardly from an end face of a piezoelectric/electrostrictive layer on a side surface where the laminated state of the piezoelectric/electrostrictive layer and the electrode layers is exposed. The distance by which the ends project outwardly from the end face is equal to or smaller than one half of the thickness of the piezoelectric/electrostrictive layer between the electrode layers. The distance is preferably in a range from 0.5 μm to 2 μm.
摘要:
The present invention provides a piezoelectric/electrostrictive device including a pair of thin plate sections in an opposed relation to each other, a fixing section for supporting the thin plate sections, and at least one pair of piezoelectric/electrostrictive elements are provided to the pair of thin plate sections. The thin plate sections include movable sections having end surfaces in an opposed relation. Recesses are formed between the thin plate sections and the fixing section and/or the movable sections.
摘要:
A piezoelectric/electrostrictive device has a rotor substantially in the form of a rectangular parallelepiped, the rotor having a pair of opposite surfaces, a first movable section fixed to a first end of one of the surfaces, a first piezoelectric/electrostrictive element for actuating the first movable section, a second movable section fixed to a second end of the other one of the surfaces, the second end being diametrically opposite to the first end, and a second piezoelectric/electrostrictive element for actuating the second movable section.
摘要:
A ceramic stack including a plurality of stacked ceramic plates having different lengths, the ceramic stack including an additional member having a curved surface, the additional member being disposed at a border between a first principal surface of the ceramic plate which is long and a side surface of the ceramic plate which is short. The short ceramic plate is stacked on the first principal surface, and the additional member has one or more inflection points on a surface thereof as viewed in a cross-sectional direction.
摘要:
A method of producing a ceramic stack is provided, including the steps of providing at least a first ceramic green sheet to be formed into a long ceramic plate and having a principal surface, providing at least a second ceramic green sheet to be formed into a short ceramic plate and having a length that is less than a length of the principal surface of the first ceramic green sheet, and laminating the second ceramic green sheet to the principal surface of the first ceramic green sheet to form a ceramic green sheet laminate having a lamination border defined between at least a side surface of the second ceramic green sheet and the principal surface of the first ceramic green sheet. The method also includes the steps of forming a member having a curved surface at the lamination border by applying a paste to the lamination border such that the curved surface includes at least one inflection point when viewed in cross-section, and sintering the laminate into an integral unit to form the ceramic stack.