Abstract: A device for detecting metal elements in slab form such as metal plates or sheets, includes an emission coil powered by suitable control elements and generating a magnetic field, a reception coil placed so as to enable generation via induction of a voltage across the terminals of the coil under the action of the magnetic field, and elements for processing and evaluating the voltage signal delivered by the at least one reception coil, enabling delivery of an information signal indicating the absence or presence of one or more metal elements near the coils. The emission coil (3) and the reception coil (5) are both mounted in a housing or a sensor head having an active detection face having an associated detection region, and are positioned at a defined inclination one relative to the other and relative to the face.

Abstract: An electronic device, in particular of the sensor or detector type, includes a housing having first and second longitudinal opposite and sealed ends. The housing contains an electronic card and with its inside volume being filled by an insulating filler material that coats the card, its components, and the end of a connecting cable connected to the card, the housing including an opening at its second end, which is sealed by a connected piece that is equipped with a passage opening for the connecting cable. The sealing piece includes at least a second through opening for injecting filler material (5), this or each second opening being sealed by a plug (9) made of a material that conducts and diffuses light, of which a portion is positioned in the vicinity of, and even in contact with, at least one light signaling element (10) or light indicator carried by the card (4).

Abstract: An inductive sensor or detector includes as its sensitive element, preferably defining a front working plane of the sensor, a coil system forming an air-core transformer arrangement with a primary coil or winding (2) and a secondary coil or winding (3). The primary coil or winding of the system is associated with a capacitive component (4) in order to constitute a LC oscillating circuit whose oscillation is sustained by an adapted generator (5) in the form of an operational amplifier (6) and an associated resistance arrangement (R, R5, R13). The sensor also includes a signal processing circuit, for example signal adding (8), amplifying, converting (9) and/or evaluating circuits (10), fed by at least one signal provided by at least one component of the coil system. The inductive sensor comprises a direct or indirect feedback line (11) from the secondary coil or winding (3) to the input of the operational amplifier (6) of the generator (5).

Abstract: An inductive proximity sensor includes a coil or inductance arranged in the vicinity of an active surface or end of the sensor, a current source repeatedly supplying the inductance, and a signals processor for signals corresponding to the voltages induced in the coil when fed. The induced voltages are influenced by the presence of objects within a given detection area, depending on their distance and on their constituting material. The coil or inductance is part of a parallel LC circuit. The current source is the capacitor of the LC circuit. A voltage signal amplitude measurement is performed after each switch from charge to discharge state. The result is computed using reference measurements to calculate a distance, a nature of the constituting material, and/or mass indicative value of the objects.

Abstract: An inductive presence, proximity or position sensor comprising an inductive coil defining a working or active face of the sensor corresponding to the external face of a covering plate or a substantially plane part of the housing or casing containing said coil, the plate or plane part being made of a metal with high mechanical resistance and being disposed substantially perpendicularly to the coil axis. The plate or plane part (4) has at least one linear discontinuity (6), extending at least partly across the plate or plane part (4).

Abstract: Sensor head or detector head (1) composed primarily of a protective casing that forms a hollow body (2) with an external surface, the so-called active surface (2?), and of a sensing or detection element mounted in the hollow body and adjacent to part of the front wall of the protective casing defining the active surface, at the level of the internal surface opposite the latter, the sensor head characterized in that the sensing element (3) is located at a distance from the internal surface (4?) of the part of the wall (4) of the hollow body (2) in such a way as to delineate an interstitial space (5) of small thickness (d) forming a mechanical and physical decoupling interface between the part of the wall (4) and the sensing element (3).

Abstract: A method for operating a photoelectric sensor arrangement having a pulsed light emitting first module, a light receiving and converting second module and a level judging and/or processing third module. The method includes: sending periodically light pulses from the first module towards the second module, producing an analog potential signal at the second module and transmitting the signal to the third module, processing the analog signal at the third module and providing an evaluation or control information or signal depending on the processing results, before transmission to the third module, inverting the analog signal produced by the second module and shifting or offsetting the inverted signal, and at the third module, measuring the inverted and shifted analogue signal at least once between two successive light pulses and processing the measured value(s).

Abstract: A temperature compensated strain gauge assembly comprises a strain gauge (10) having two or more resistor or piezoresistors (Rb) in half bridge or full bridge configuration and one or more temperatures compensating resistors or piezoresistors (Rc) connected in series with the bridge resistors or piezoresistors. The resistance of the temperature compensating resistor(s) or piezoresistor(s) is such that, as temperature changes, the compensating resistor(s) or piezoresistor(s) compensates for a change in span of the strain gauge so that, for a given load applied to the substrate, the span of the strain gauge will remain constant or substantially constant and compensate(s) the null shift of the strain gauge when the bridge resistors or piezoresistors are such as to provide a known offset at a given temperature.

Abstract: The invention relates to a proximity or presence switch arrangement operating in accordance with the inductive principle, comprising at least one inductor integrated in an oscillating circuit and an electronic control and evaluation device connected downstream for sensing or detecting the approach and/or presence of a material influencing electromagnetic fields.