Abstract:
The invention relates to a rotary speed sensor (100) comprising a tuning fork-shaped oscillator (30) having a first electrically conductive prong (11 a) and a second electrically conductive prong (11 b) located at a distance therefrom, wherein the first prong (11 a) and the second prong (11 b) are connected to each other via a base (12). The rotary speed sensor (100) further comprises a web (21) connecting the base (12) to an electrically conductive substrate (1), and a readout device (20) for detecting vibrations of the oscillator (30), wherein the oscillator (30) has a uniform potential and is electrically insulated from one or more excitation electrodes (14) arranged adjacent to the prongs (11 a, 11 b), in order to allow electrostatic excitation between the prongs (11 a, 11 b) and the excitation electrodes (14). The rotary speed sensor has a simple design and is simple to control and read.
Abstract:
Micromachined vibratory gyroscope having two or more coplanar movable masses suspended over a planar substrate. Two perpendicular axes (x and y) are defined within the substrate plane, while a third, the z-axis or input axis, is defined to be perpendicular to the substrate plane. The movements of the two masses along the x-axis are coupled through an electrostatic coupling means so that the natural resonant frequency of the in-phase mode and that of the anti-phase mode are separated from each other for the resonances along the x-axis. When the two masses are driven to vibrate along the x-axis in the anti-phase mode and the device experiences rotation about the z-axis, Coriolis forces act differentially on the masses in the Ydirection, causing the two masses to dither in an anti-phase motion along the y-axis. The anti-phase dithering along the y-axis can be sensed directly by a rate sensor to measure the rate of rotation about the z-axis. Alternatively, the anti-phase dithering of the first and second bodies along the y-axis can be transferred to other movable bodies (i.e., rate-sensing masses) whose movement is then sensed to measure the rate of rotation about the z-axis. The sensing bodies are preferably suspended in such manner that, in the absence of Coriolis forces, the x-axis motion of the vibrating masses does not affect the sensing bodies. That inhibits motion of the sensing bodies in response to linear acceleration within the plane of the substrate, but permits those bodies to respond readily to the Corollas-induced motion about an axis perpendicular to the substrate plane.
Abstract:
Bei einem Mikromechanischer Drehratensensor mit einer auf eine von außen einwirkenden Drehrate reagierenden Sensorstruktur tritt bei bekannten Sensoren das Problem auf, dass aufgrund des Aufbaus der Sensoren, das die Drehrate charakterisierende Ausgangssignal als amplitudenmoduliertes Signal vorliegt und als solches besonders anfällig für Störungen ist und ein schlechtes Signal-Rausch-Verhältnis aufweist. Gemäß der Erfindung ist eine Resonatorstruktur mit mind. einer Eigenfrequenz vorgesehen, wobei die eigentliche Sensorstruktur mit der Resonatorstruktur mechanisch derart verbunden ist, dass eine einwirkende Drehrate die Eigenfrequenz der Resonatorstruktur ändert. Die Änderung der Eigenfrequenz der Resonatorstruktur bzw. eine von der Eigenfrequenz der Resonatorstruktur abgeleitete Größe wird als Maß für die Drehrate ausgewertet.
Abstract:
The invention relates to a method for screening antimycotically active substances, whereby essential genes from mycetes, especially of Saccaromyces cerevisae, and functionally homologous and/or sequentially homologous mycetes genes are used as targets. Said method is thus characterized in that essential genes from mycetes are used as targets.
Abstract:
Ein Drehratensensor (100) umfasst einen stimmgabelförmigen Oszillator (30) mit einem ersten elektrisch leitfähigen Zinken (11 a) und einem im Abstand dazu angeordneten zweiten elektrisch leitfähigen Zinken (11 b), wobei der erste Zinken (11 a) und der zweite Zinken (11 b) über eine Basis (12) miteinander verbunden sind. Ferner umfasst der Drehratensensor (100) einen Steg (21), welcher die Basis (12) mit einem elektrisch leitfähigen Substrat (1) verbindet, eine Ausleseeinheit (20) zum Erfassen von Schwingungen des Oszillators (30), wobei der Oszillator (30) ein einheitliches Potential besitzt und von einer oder mehreren benachbart zu den Zinken (11 a, 11 b) angeordneten Anregungselektroden (14) elektrisch isoliert ist, um eine elektrostatische Anregung zwischen den Zinken (11 a, 11 b) und den Anregungselektroden (14) zu ermöglichen. Der Drehratensensor ist einfach aufgebaut, anzusteuern und auszulesen.
Abstract:
The invention relates to a housing, in particular for the installation of electrical and electronic components, comprising a housing lower section and a cover, fixable thereto, whereby the cover and housing lower section are connected to each other in a hinged manner, by means of at least two flexible inner elements, arranged at a separation from each other outside the sealed inner chamber of the housing. Conventional housings of this type have the disadvantage that the hinge-like connection of housing lower section and cover is relatively costly. The aim of the invention is to provide a less costly solution for the above. Said aim is achieved whereby the ends (19.1), (19.2) of the flexible inner element (19) have a greater cross-section than the region lying between said ends, whereby at least one of the ends (19.2) is elastically embodied for a temporary reduction in cross-section. Through openings (17, 18), leading into each other, are provided in the cover (3) and in the housing lower section (2), the cross-section of which permits access of the at least one end (19.2) in the extended state, which, after access through the corresponding through opening (17, 18), increases in cross-section again on elastic relaxation.
Abstract:
Proposed is a gyrometer whose structure is made up of silicon (silicon compounds or silicon/glass compounds) or other semiconductor materials using micromechanical techniques. The gyrometer has the shape of a tuning fork whose prongs lie in planes parallel to the surface of the semiconductor wafer. The prongs are caused to vibrate in a plane at right angles to the plane of the wafer. A sensor element which records the torsion in the tuning-fork mounting is used to measure the angular speed of the gyrometer about an axis parallel to the tuning-fork mounting.
Abstract:
Micromachined vibratory gyroscope having two or more coplanar movable masses suspended over a planar substrate. Two perpendicular axes (x and y) are defined within the substrate plane, while a third, the z-axis or input axis, is defined to be perpendicular to the substrate plane. The movements of the two masses along the x-axis are coupled through an electrostatic coupling means so that the natural resonant frequency of the in-phase mode and that of the anti-phase mode are separated from each other for the resonances along the x-axis. When the two masses are driven to vibrate along the x-axis in the anti-phase mode and the device experiences rotation about the z-axis, Coriolis forces act differentially on the masses in the Ydirection, causing the two masses to dither in an anti-phase motion along the y-axis. The anti-phase dithering along the y-axis can be sensed directly by a rate sensor to measure the rate of rotation about the z-axis. Alternatively, the anti-phase dithering of the first and second bodies along the y-axis can be transferred to other movable bodies (i.e., rate-sensing masses) whose movement is then sensed to measure the rate of rotation about the z-axis. The sensing bodies are preferably suspended in such manner that, in the absence of Coriolis forces, the x-axis motion of the vibrating masses does not affect the sensing bodies. That inhibits motion of the sensing bodies in response to linear acceleration within the plane of the substrate, but permits those bodies to respond readily to the Corollas-induced motion about an axis perpendicular to the substrate plane.
Abstract:
Es wird ein Verfahren zum Trimmen von Sensoren mit schwingenden Strukturen angegeben, bei dem ein Sensorelement (14), das eine schwingfähige Struktur zur Erfassung einer Messgrösse aufweist, mit einem Laserstrahl (17a) bearbeitet wird, um gezielt Masse abzutragen, wobei mindestens eine Resonanzfrequenz des Sensorelements (14) und/oder eine Unwucht des Sensorelements (14) abgeglichen wird. Während des Abtragens der Masse schwingt das Sensorelement und es wird eine Zustandsänderung instantan gemessen. Zur Erzeugung des Laserstrahls (17a) wird ein Femtosekundenlaser (17) verwendet. Eine Vorrichtung (10) zum Trimmen von Sensoren hat eine Messeinrichtung (13) zur Bestimmung einer Resonanzfrequenz und/oder einer Unwucht des Sensorelements (14), einen Laser (17) mit einer Steuereinrichtung (18) zur gezielten Abtragung von Masse des Sensorelements, und eine Vergleichseinrichtung, um einen Messwert, der die aktuelle Resonanzfrequenz und/oder die aktuelle Unwucht repräsentiert, mit einem vorgegebenen Wert zu vergleichen.