A piezoelectric sensor device (11) comprising a piezoelectric element (1) and at least one metallic body (14, 16), with an insulating body (2) arranged between each metallic body (14, 16) and the piezoelectric element (1). The insulating body (2) substantially consists of a crystalline material or ceramics. At least one surface of the insulating body (2) in contact with the metallic body (14, 16) is covered by a metallic layer (3) in order to suppress noise signals due to a stick-slip effect and differing thermal expansion coefficients
H10N 30/80 - Dispositifs piézo-électriques ou électrostrictifs - Détails de structure
H10N 30/057 - Fabrication de dispositifs piézo-électriques ou électrostrictifs multicouches ou de leurs parties constitutives, p.ex. en empilant des corps piézo-électriques et des électrodes par empilement de corps massifs piézo-électriques ou électrostrictifs et d’électrodes
H10N 30/067 - Formation d’électrodes à une seule couche de parties piézo-électriques ou électrostrictives multicouches
H10N 30/30 - Dispositifs piézo-électriques ou électrostrictifs à entrée mécanique et sortie électrique, p.ex. fonctionnant comme générateurs ou comme capteurs
2.
OPTICAL SENSOR FOR THE MEASUREMENT OF PHYSICAL PARAMETERS IN HARSH ENVIRONMENTS AND METHODS OF MAKING AND USING THE SAME
ABS TRACT An optoelectronic system for measuring physical parameters comprising: two narrow band light sources with different peak frequencies coupled together into a combined light using a coupler. The combined light is split into a first Fabry- Pérot interferometer arranged to be exposed to both temperature and physical parameter of interest and a second Fabry-Pérot interferometer arranged to be exposed only to temperature. The system further comprises first and second optical detectors arranged to receive light reflected from the cavities of the first and second Fabry- Pérot interferometers respectively through an optical path comprising a combination of lenses and/or mirrors and a Fizeau interferometer. A processor is arranged to analyze the data received by the first optical detector and second optical detector and calculate a value for temperature and the physical parameter of interest. Date Recue/Date Received 2020-11-30
G01D 21/02 - Mesure de plusieurs variables par des moyens non couverts par une seule autre sous-classe
G01L 11/02 - Mesure de la pression permanente, ou quasi permanente d'un fluide ou d'un matériau solide fluent par des moyens non prévus dans les groupes ou par des moyens optiques
3.
SENSOR ASSEMBLY FOR DETERMINING A PHYSICAL PROPERTY OF A VEHICLE
A sensor assembly providing a physical property of a vehicle, e.g. tire pressure of a wheel of an aircraft, comprises electronic circuitry including a locking arrangement (236) and sensor suited to sense the physical property and an exhaustable power source, e.g. a battery. For prolonged shelf life, a first (76,232,230,220) and a second (242,244, 220) switch means are functionally arranged between power source and circuitry. The 2nd switch means (242,244, 220) is controlled by the locking arrangement (236), whereas the first switch means (76,232,230,220) is controllable from outside the sensor assembly, e.g. by a magnetic field. The first switch means is arranged to switch the power to the electronic circuitry, whereby the locking arrangement is powered, too. In consequence, the locking arrangement is capable to close the second switch means (242,244, 220). Thereafter, a further stimulus to the first switch will no more be capable to switch the sensor off, unless the locking arrangement enables it again by opening the second switch means (242,244, 220).
G01L 17/00 - Dispositifs ou appareils pour mesurer la pression des pneumatiques ou la pression dans d'autres corps gonflés
B64F 5/60 - Test ou inspection des composants ou des systèmes d'aéronefs
B60C 23/04 - Dispositifs avertisseurs actionnés par la pression du pneumatique montés sur la roue ou le pneumatique
G01D 3/10 - Dispositions pour la mesure prévues pour les objets particuliers indiqués dans les sous-groupes du présent groupe avec dispositions pour intercaler des organes indicateurs ou enregistreurs supplémentaires ou auxiliaires
G06F 1/26 - Alimentation en énergie électrique, p.ex. régulation à cet effet
G06K 19/07 - Supports d'enregistrement avec des marques conductrices, des circuits imprimés ou des éléments de circuit à semi-conducteurs, p.ex. cartes d'identité ou cartes de crédit avec des puces à circuit intégré
A measuring circuit comprises a sensing element (12) configured to generate a measuring signal from a measuring object (17), a signal injector for (56) generating an auxiliary signal, and an evaluation circuit (48, 78, 88, 98, 108, 118) comprising a first upstream amplifier (52) with a first input connected to a first pole (16) of the sensing element (12) via a first signal line (38) and a second upstream amplifier (51) with a first input connected to a second pole (15) of the sensing element (12) via a second signal line (37). To allow continuous testing of the integrity of the measurement signal from the sensing element and/or the measuring circuit to be upgradable with respect to a different sensing and/or evaluation unit, the first upstream amplifier (52) comprises a second input connected to the signal injector (56), and the evaluation circuit (48, 78, 88, 98, 108, 118) comprises a downstream amplifier (53) having a first input connected to the signal injector (56) and a second input connected to an output of the first upstream amplifier (52).
G01D 3/036 - Dispositions pour la mesure prévues pour les objets particuliers indiqués dans les sous-groupes du présent groupe pour atténuer les influences indésirables, p.ex. température, pression sur les dispositions de mesure elles-mêmes
The invention relates to a measuring circuit comprising - an evaluation circuit; - a sensing circuit comprising a sensing element configured to generate a measuring signal from a measuring object and a transmission line for transmitting the measuring signal to the evaluation circuit; and - a test signal injection circuit comprising a signal injector and an injection line connecting a signal output of the signal injector with the sensing circuit for feeding a test signal into the sensing circuit such that the test signal is transmittable to the evaluation circuit over the transmission line. To provide the measuring circuit with an improved surveillance and/or testing operability, the invention suggests that the injection line and the transmission line are interconnected in series via the sensing element such that said test signal can be fed through the sensing element.
The invention relates to a force sensor comprising a transducer with a measuring element operatively connected to a measuring object for generating measuring signals of a force acting on the measuring object, and two transmission channels configured to transmit mutually corresponding signals of said measuring signals independently from one another. The invention also relates to a method for testing the operational reliability of such a force sensor. To allow an easier production of the force sensor and/or to provide the force sensor with an improved operational characteristics, the invention suggests that said transmission channels are connected in parallel to the same transducer such that the transmitted signals at the output of each transmission channel can be verified. In an according testing method, a test signal is evaluated in a transmission channel in which the test signal has been injected and in another transmission channel in which the test signal has not been injected. In another testing method, the transmitted signals are compared, wherein the result of the comparison is used to assess the correctness of the transmitted signals.
G01P 15/09 - Mesure de l'accélération; Mesure de la décélération; Mesure des chocs, c. à d. d'une variation brusque de l'accélération en ayant recours aux forces d'inertie avec conversion en valeurs électriques ou magnétiques au moyen de capteurs piézo-électriques
G01V 13/00 - Fabrication, étalonnage, nettoyage ou réparation des instruments ou dispositifs couverts par les groupes
A mass flow meter comprising a housing including a fluid inlet and a fluid outlet. The housing defines a chamber and a rotatable member is arranged in the chamber so as to be rotatable about an axis. A momentum device is also arranged in the chamber and connected to the rotatable member via a biasing element so as to be rotatable about the axis and rotatable relative to the rotatable member. A fluid path in fluid communication with the fluid inlet and the fluid outlet is provided. The fluid path passes through both the rotatable member and the momentum device. The fluid path enters the momentum device at a radial distance r1 from the axis and exits the momentum device at a different radial distance r2 from the axis. A torque provider may be coupled to the rotatable member via a shaft or gear member.
G01F 1/80 - Débitmètres massiques directs fonctionnant en mesurant la pression, la force, le couple ou la fréquence d'un écoulement de fluide auquel a été donné un mouvement de rotation
G01F 1/82 - Débitmètres massiques directs fonctionnant en mesurant la pression, la force, le couple ou la fréquence d'un écoulement de fluide auquel a été donné un mouvement de rotation en utilisant comme impulseur une roue entraînée, et comme dispositif de mesure une ou plusieurs autres roues ou éléments mobiles retenus angulairement par un élément élastique, p.ex. par un élément de ressort
F02M 37/00 - Appareils ou systèmes pour transférer le combustible liquide des réservoirs de stockage aux carburateurs ou aux injecteurs; Dispositions d'épuration du combustible liquide spécialement conçues pour les moteurs à combustion interne ou aménagées sur ceux-ci
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