摘要:
A porous Al.sub.2 O.sub.3 thick film covers the SrTiO.sub.3 layer of an oxygen sensor, said SrTiO.sub.3 layer being contacted by means of two Pt electrodes and deposited on an Al.sub.2 O.sub.3 substrate. The electrically insulating Al.sub.2 O.sub.3 layer bears a protective layer, which is exposed to the exhaust gas and is preferably also made of SrTiO.sub.3. This construction ensures that the output signal of the sensor representing the oxygen partial pressure then depends only on the resistance or, respectively, conductivity value of the non-contaminated SrTiO.sub.2 sensor layer.
摘要翻译:多孔Al 2 O 3厚膜覆盖氧传感器的SrTiO 3层,所述SrTiO 3层通过两个Pt电极接触并沉积在Al 2 O 3衬底上。 电绝缘的Al 2 O 3层具有暴露于废气的保护层,并且优选也由SrTiO 3制成。 这种结构确保代表氧分压的传感器的输出信号然后仅取决于未污染的SrTiO 2传感器层的电阻或电导率值。
摘要:
In order to avoid measurement signal drift, a gas sensor has a gas sensitive layer which is provided on its upper side with a measuring electrode structure and on its lower side with an electrically conductive layer.
摘要:
The invention relates to an injection valve which has a piezo actuator that is functionally connected to a nozzle needle by a hydraulic transmission device. The hydraulic transmission device is connected to a pressure reservoir by a sealing gap so that the pressure differences between the pressure reservoir and a hydraulic chamber of the hydraulic transmission device are compensated in the long term.
摘要:
A hydrogen sensor employs a hydrogen-sensitive semiconductor layer that is applied to a carrier substrate. The hydrogen-sensitive semiconductor layer includes a first and second semiconductor layers that consist of strontium titanate so as to compensate for temperature fluctuations in the hydrogen-sensitive semiconductor layer. The first and second semiconductor layers include a respective and different electrical conductivity.
摘要:
A device and method for dosing fluid has a housing enclosing a lifting element and a primary drive hydraulically operable on the lifting element via a hydraulic chamber. The lifting element is disposed within a borehole with a leakage permitting fit. A fluid chamber in communication with the borehole contains a fluid to be dispensed in a dosed manner by controlled axial movement of the primary drive and lifting element.
摘要:
An easily controllable primary drive (5) guided in a first bore (3), for example a piezo actuator, transmits its stroke by a piston-hydraulic stroke transmission with a hydraulic chamber (2) onto a stroke element (70) of the secondary side guided in a second bore (4). The pressure in a valve chamber (9) is controlled via the stroke element (7) of the secondary side.
摘要:
Drive elements whose physical volume is considerably smaller than piezoelectric actuators for comparable mechanical characteristics and actuation travels can be developed on the basis of the magnetostrictive material Tb.sub.x Dy.sub.1-x Fe.sub.2 (Terfenol). Despite these characteristics, magnetostrictive actuators have until now been used only where no rapid switching processes or actuation movements are required. An actuator of compact construction responds to an electrical drive signal very quickly and can produce large actuation forces. The actuator typically contains N.apprxeq.100 drive elements (1, 1') which are arranged one above the other in the form of a stack, are each of layered construction, and are provided with electrical connections. The drive elements (1, 1') each have a small metal plate (4, 4'), which is arranged between two insulators (2, 2', 3, 3'), and an actuator element (5, 5') which is manufactured from Terfenol. When current flows through it, the small metal plate (4, 4'), which is slotted in a U-shape, acts as a planar annular coil whose magnetic field passes through the actuator element (5, 5') and causes magnetostriction there.
摘要:
A rapid temperature sensor formed of a metal from the platinum group is provided. The rapid temperature sensor includes a substrate over which a platinum resistive layer is provided. A double layer, forming a passivation layer, is provided over the platinum resistive layer to prevent oxidation. The double layer includes a ceramic layer and a glass layer. The double layer prevents oxygen from reaching the platinum resistive layer even at temperatures up to 1,000.degree. C.
摘要:
A fuel injection nozzle for a combustion engine not only has a valve for alternately opening and closing the nozzle, but also has a part which undergoes alternating stroke movement, either longitudinally or transversely. The alternating stroke movement changes the opening angle of the nozzle opening. The alternating stroke movement is in a frequency range of approximately 5 to 20 kiloHertz.
摘要:
A pyrodetector, which is both movement selective and directional selective, has preferably a foil supporting detector elements relative to a concave mirror which may have a spherical curve surface, a spherical-parabolic curve surface or a curve surface between a spherical surface and a spherical-parabolic surface. The sensor is preferably a plurality of individual sensor elements which are arranged on an arc, preferably on a planar member or a foil, and may include additional or second sensor elements having electrodes which are for determining temperature compensation for the detector.