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 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 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: 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: An inductive presence, proximity or position sensor includes 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 the coil, the plate or plane part being made of a metal with high mechanical resistance and being disposed substantially perpendicularly to the coil axis. Sensor (1) is characterised in that the plate or plane part (4) includes at least one cut or similar linear discontinuity (6), extending at least partly accross the plate or plane part (4).

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: An inductive proximity sensor (D) includes: a coil or inductance (L) arranged in the vicinity of the active surface or end of the sensor (D), a current source (C, S) repeatedly supplying the coil or inductance, a signals processor (SP) for signals corresponding to the voltages (V) induced in the coil or inductance (L) when fed, the induced voltages (V) being influenced by the presence of objects or bodies (B) within a given detection area, depending on their distance and on their constituting material(s), and the coil or inductance (L) being part of a parallel LC circuit. The current source is the capacitor (C) 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 distance (D), nature of the constituting material(s), and/or mass indicative value of the object(s) (B).