Inductive sensor

About: Inductive sensor is a research topic. Over the lifetime, 2282 publications have been published within this topic receiving 21984 citations.

Inductive sensor arrangement, especially for detecting pots on cooker hobs, has a control circuit connected to the sensors via MOSFET switches with low drain-source resistance

Abstract: Circuit arrangement for a number of inductively operating sensors (L1-L4) has control (13) and evaluation means for the sensors and sensor signals. The control means are connected to the sensor via MOSFET switches (S1-S4) with low drain-source resistance. The invention also relates to a corresponding method for control of the MOSFET switches in which the gate control voltage is regulated so that a frequency is output that is constant over a temperature range.

Inductive switch for adjustment and switching for applications in special environments

Abstract: An inductive programming switch for applications in special environments, comprising an inductive component and a container in which the inductive component is accommodated proximate to a wall of the container, the inductive component being connected to an electronic evaluation circuit, which is adapted to detect variations of parameters of the inductive component caused by the approach of a metallic object to the wall, the evaluation circuit being adapted to detect and identify a sequence of approach/spacing of the metallic object with respect to the wall and for modifying its functional parameters according to the sequence.

Inductive current sensor based on nanocrystalline alloys

Abstract: In this paper are described the design and application of an inductive magnetic sensor based on nanocrystalline alloys. The sensor is adjusted for measurement and monitoration of currents with intensities from some microamperes to miliamperes. Its functional behaviour, performance and a specific application are described. One of the biggest advantages of this current sensor is its non-invasive characteristic, it means, is not required any direct contact with the circuit that is being monitored. It becomes appropriated for diverse applications where this requirement is necessary. An example of this sensor application is the metal oxide surge arresters leakage current monitoring.

Calibration of nanosensors with direct traceability to the meter

Abstract: Nanosensors are a new class of sensors that has recently appeared. These sensors are characterized by nanometer or sub-nanometer resolution over a range of at least several micrometers. The most well known examples are capacitive and inductive sensors but also laser interferometers, holographic scales, and scanning probe microscopes (SPM's) belong to the class of nanosensors. The accuracy of these nanosensors is not necessarily of the same level as the resolution. Effects like sensitivity errors, non-linearity, hysteresis and drift may cause deviations of many nanometers. In order to determine these errors in a traceable way, a new measuring instrument was developed. The heart of the system is a Fabry-Perot interferometer, which consists of two parallel mirrors separated by a distance L from each other. Light of a so-called slave laser is directed into this Fabry-Perot cavity and stabilized to the cavity length L. When one of the mirrors of this cavity is displaced the frequency of the slave-laser will follow its movement. The frequency of this slave-laser is then compared to the frequency of a primary length standard. In this way the displacement of the mirror is measured. When a nanosensor is placed on top of the mirror it will also follow the movement of the mirror. In this way the nanosensor is calibrated. The range of the instrument is 300 micrometers and the uncertainty is approximately 1 nm. Measurements of different sensors, such as an inductive and a capacitive sensor as well as a laserinterferometer will be presented. A detailed description of the uncertainty budget will also be given.

Physiological constraints for an intraocular inductive distance sensor.

Abstract: In this paper the design restrictions of an inductive sensor for an intraocular lens with focus control on the basis of a marker implanted in the ciliary muscle of the eye are discussed in the framework of anatomical and physiological influences and constraints: limitations on the marker size, influences of tissue conduction and effects of off-axis implantation of the marker with respect to the coil.