摘要:
A method and apparatus for controlling energy expended by sensor network nodes is disclosed. The method comprises steps of acquiring energy information that is indicative of an energy status of a node in the network and adjusting at least one data transmission parameter according to the energy information. In a wireless network where the communication capacity and power energy of sensor nodes are limited, the invention provides the capability of efficiently utilizing the network resources, conserving power consumption of sensor nodes, and prolonging the life of the sensor network.
摘要:
A switching arrangement includes a sensor (1) for detecting physical actions of a user (3) within a region of space in which the user is located. The sensor generates an output signal representative of a detected physical action, the signal being received by a signal-processing system (5). The signal-processing system is adapted to analyse the output signal to determine whether the user has made a deliberate physical action and to actuate a switch (9) on detection of such a deliberate physical action.
摘要:
So-called active sensors are used to detect the rotational movement of a motor vehicle wheel. One type of active sensor is based on the magnetoresistive effect. Associated with the element (4) which is sensitive to magnetic fields are evaluating electronics (5) which generate current or voltage signals. The rubber tyres on vehicle wheels can become electrostatically charged; if a discharge occurs, the charges can be transmitted to the electronic components and the energy released can be so great that these components are destroyed. According to the invention, therefore, screening (8) is provided, preferably disposed between the toothed magnet wheel (2) and the element (4) which is sensitive to magnetic fields.
摘要:
Die Erfindung betrifft eine Messanordnung zur gleichzeitigen Erfassung eines elektrischen Signals und eines überlagerten Teilsignals. Das Problem der genauen Analyse von Teilsignalen durch Vergrösserung und bessere Auflösung besteht bei dynamischen Kraft-, Druck-, Beschleunigungs- und Dehnungsmessvorgängen, insbesondere bei zyklischen Vorgängen wie beispielsweise dem Spritzgiessen. Die Verstärkerschaltung umfasst im wesentlichen einen dem Aufnehmer folgenden ersten Messverstärker (Messverst.), und, in Serie dazu, einen zweiten Messverstärker bestehend aus einem Ladungsverstärker V₁ und einem Spannungsverstärker V₂ , mit kapazitiver Kopplung an den Ausgang des ersten Messverstärkers. Sowohl am Ausgang A (Ausg. A) des ersten Messverstärkers, wie am Ausgang B (Ausg. B) des zweiten Messverstärkers (V₁ , V₁ ) können Messsignale abgenommen werden. Die Spannung U a am Ausgang A ist repräsentativ für das Gesamtsignal, die Spannung U b am Ausgang B für das verstärkte und besser aufgelöste Teilsignal. Der zweite Messverstärker kann dadurch aktiviert werden, dass ein vorher geschlossener die Gegenkopplungskapazität C g überbrückender Schalter durch ein Steuersignal geöffnet wird (Uebergang von der Reset- in die Operate-Position). Dieser Vorgang lässt sich während des ganzen Messvorganges beliebig wiederholen, so dass die Teilsignale mehrerer Zeitabschnitte vergrössert und besser aufgelöst werden können.
摘要:
Systems and methods for filtering a micro-electromechanical system sensor rate signal with error feedback are provided. In one example, a micro-electromechanical system sensor rate signal is provided. Next, a feedback signal from a feedback loop is subtracted from the micro-electromechanical system sensor rate signal to produce a first combined signal. The first combined signal is then filtered to produce a filtered rate output. The micro-electromechanical system sensor rate signal is then subtracted from the filtered rate output to produce an error signal, wherein the error signal is used in the feedback loop to generate a feedback signal for a future time step.
摘要:
A collision position detection device (50) comprises: a piezoelectric element (51) that generates a voltage by collision; signal detection means that detects a signal generated by the collision with the piezoelectric element (51); and processing means that identifies the position of the collision with the piezoelectric element based on the signal detected by the signal detection means. The piezoelectric element (51) is a long piezoelectric element (51) comprising a long piezoelectric body (51b), conductors (51a, 51c) layered on both surfaces of the piezoelectric body (51b), and a covering body (51d) that covers the peripheries of the conductors, wherein both of a leading end signal generated from a leading end of the long piezoelectric element (51) and a back end signal generated from a back end of the long piezoelectric element (51) can be detected to identify a collision position. The disposition of the collision position detection device in a windmill blade enables information about a bird colliding with the blade to be detected.
摘要:
Systems and methods for filtering a micro-electromechanical system sensor rate signal with error feedback are provided. In one example, a micro-electromechanical system sensor rate signal is provided. Next, a feedback signal from a feedback loop is subtracted from the micro-electromechanical system sensor rate signal to produce a first combined signal. The first combined signal is then filtered to produce a filtered rate output. The micro-electromechanical system sensor rate signal is then subtracted from the filtered rate output to produce an error signal, wherein the error signal is used in the feedback loop to generate a feedback signal for a future time step.
摘要:
A method and apparatus for controlling energy expended by sensor network nodes is disclosed. The method comprises steps of acquiring energy information that is indicative of an energy status of a node in the network and adjusting at least one data transmission parameter according to the energy information. In a wireless network where the communication capacity and power energy of sensor nodes are limited, the invention provides the capability of efficiently utilizing the network resources, conserving power consumption of sensor nodes, and prolonging the life of the sensor network.