摘要:
A circuit board having, between the circuit board and a component arranged thereon, an electrical and mechanical connection of high mechanical-load-bearing ability. The circuit board includes at least one internally situated conductor path, a first insulating layer arranged on a first surface of the circuit board, a second insulating layer arranged on a second surface of the circuit board, a first contact location at which the conductor path is accessible, a second contact location, at which the conductor path is accessible through a bore passing completely through the circuit board, and an electronic component arranged on the first surface. The component has a first contact surface, which is connected with the first contact location by solder or electrically conductive adhesive, and a second contact surface which is connected with the second contact location by solder or adhesive.
摘要:
The invention relates to an electromechanical drive or a sensor element composed of piezoelectric elements arranged in the form of a stack. The drive or the sensor element is intended for measurement instruments and operates even at very high temperatures. The new drive or the new sensor element (10) for this purpose comprises a number of piezoelectric ceramic layers (12a-f), with electrode layers (16a-e) in each case being arranged between two mutually facing surfaces of directly adjacent piezoelectric ceramic layers. Connectors (18a,b) in the form of wires run in grooves (14a-d) in the electrode layers (16a-e) in order to make electrical contact with the electrode layers (16a-e), and are passed out of the electrode layers (16a-e).
摘要:
Sensing the level of a liquid in a vessel by the pulse transit time technique is done by means of an ultrasonic transducer mounted above the highest-permissible level in the vessel which emits ultrasonic transmission pulses to the surface of the liquid and receives the ultrasonic echo pulses reflected from the liquid surface. The level in the vessel is established from the transit time of the ultrasonic pulses. To detect an overfill when the ultrasonic transducer is immersed in the liquid the decaying output signal of the ultrasonic transducer generated by the ringing of the ultrasonic transducer following the end of the each ultrasonic transmission pulse is analyzed. In this arrangement the fact is exploited that due to the better coupling of the ultrasonic transducer to the liquid than to air the ringing duration is shorter when the ultrasonic transducer is covered by the liquid.
摘要:
A composite material comprises a polymer matrix; and zeolite, which is bonded in the polymer matrix; wherein the percent of volume of the zeolite in the volume of the composite material amounts to at least 50%, in particular at least 65%. The polymer matrix can in particular comprise a polymer, which is selected from a group of polymers that consist of fluoroplastics, polyaryletherketones, sulphur-containing polymers and high heat resistant polymers. The zeolite comprises in particular a zeolite of type A, in particular a zeolite 4A or 3A.
摘要:
A method and an apparatus for determining at least one flow characteristic of an essentially laminarly flowing, gaseous or liquid medium in a pipeline. Distinguishing features include: that at least one modulation element introduced into, or placed in, the pipeline produces, at least for the case, in which the medium is flowing with a velocity different from zero, a change in density of the medium, at least at times, in the vicinity of the modulation element; that at least one mechanically oscillatable unit introduced into, or placed in, the pipeline and spaced from the modulation element is excited to resonant oscillations; that mechanical oscillations are received by the mechanically oscillatable unit and converted into an electrical, received signal, wherein the received signal is sensitive to the density change; and that the at least one flow characteristic of the medium is determined from the reaction of the received signal of the mechanically oscillatable unit to the density change.
摘要:
An apparatus for determining and/or monitoring pressure. The apparatus comprises at least one pressure transducer, which transduces pressure into an electrical signal. The invention includes the features that at least one acoustic sensor is provided, that the acoustic sensor registers acoustic signals and transduces such into electrical signals, and that the acoustic sensor is mechanically and/or acoustically coupled with the pressure transducer.
摘要:
An apparatus for determining and/or monitoring at least one process variable of a medium, including: at least one mechanically oscillatable membrane, which has a plurality of natural eigenmodes; and at least one driving/receiving unit, which excites the membrane to execute mechanical oscillations and/or which receives mechanical oscillations from the membrane. The driving/receiving unit and the membrane are embodied and matched to one another in such a manner, that the membrane executes only mechanical oscillations, which correspond to modes, which lie above the fundamental mode of the membrane.
摘要:
A dry, front-flush, pressure measuring transducer, which enables reliable measurements over a large temperature range. The transducer includes: a process connection made of a stainless steel and serving for securing the pressure measuring transducer to a measuring site; and a pressure sensor module, including a holder of stainless steel, into which a metal separating diaphragm is set front-flushly by means of a purely metal connection. A pressure to be measured acts on the separating diaphragm during measurement operation. The holder is set front-flushly by means of a purely metal connection into the process connection. The pressure sensor module further includes a titanium disk which is carried by the holder. A sapphire carrier with integrated silicon sensors is secured to the titanium disk. The titanium disk forms the separating diaphragm or it is physically connected with the separating diaphragm in such a manner that a deflection of the separating diaphragm effects a corresponding deflection of the titanium disk.
摘要:
An apparatus for determining and/or monitoring at least one physical or chemical, process variable of medium having at least one oscillatable unit, which produces, and/or receives, mechanical oscillations. Included is at least one tuning unit, whose stiffness is changeable and which is embodied in such a manner and connected in such a manner with the oscillatable unit, or is a part of the oscillatable unit in such a manner, that at least the resonance frequency of the oscillatable unit is changeable via the tuning unit. A corresponding method is also noted.
摘要:
A dry, front-flush, pressure measuring transducer, which enables reliable measurements over a large temperature range. The transducer includes: a process connection made of a stainless steel and serving for securing the pressure measuring transducer to a measuring site; and a pressure sensor module, including a holder of stainless steel, into which a metal separating diaphragm is set front-flushly by means of a purely metal connection. A pressure to be measured acts on the separating diaphragm during measurement operation. The holder is set front-flushly by means of a purely metal connection into the process connection. The pressure sensor module further includes a titanium disk which is carried by the holder. A sapphire carrier with integrated silicon sensors is secured to the titanium disk. The titanium disk forms the separating diaphragm or it is physically connected with the separating diaphragm in such a manner that a deflection of the separating diaphragm effects a corresponding deflection of the titanium disk.