Inductive sensor

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

Modelling and simulation of sensors for position control for hydraulic mechatronic systems

Abstract: Many electro-hydraulic applications like automated manufacturing tools and systems, robotics or seismic test benches for civil engineering require precise control of hydraulic cylinders. This control can be obtained only using reliable and accurate position sensors, usually resistive or inductive. The paper presents design, modelling, simulation and implementation of two types of position sensors for hydraulic mechatronic systems - differential inductive type and integrated accelerometer-based. Both sensors use microcontrollers for data processing and communication. Each type has its advantages - the inductive sensor is more accurate, accelerometer-based one requires simpler mechanical construction. The idea of using of accelerometer-based sensor was to replace standard displacement transducer attached on the cylinder with an accelerometer connected to a microcontroller that reads acceleration data and calculates displacement, thus eliminating mechanical coupling between cylinder rod and cylinder body. Both solutions are analyzed and compared on the same hydraulic test bench.

Micro inductive sensor

Abstract: An inductive sensor includes a sensor package and a coupler package. The sensor package includes a signal processor, an integrated capacitor, a ferrite layer, a transmitter coil, a two part receiving coil, and a plurality of discrete components. The coupler package includes an integrated capacitor, a ferrite layer, and a coupler coil. The transmitter coil in the sensor package is energized by an external power source which in turn energizes the coupler coil in the coupler package. The sensor then measures the rotational position of the coupler package relative to the sensor package by detecting and measuring, with the two part receiving coil, the signal returned by the coupler coil. The signal processor calculates the position of the coupler package relative to the sensor package by comparing the coupling factors between the coupler package and the sensor package.

Finite element modelling of inductive sensors

Abstract: Practical aspects of finite‐element modelling of magnetic fields and calculating integral parameters such as a reflected impedance in inductive sensing devices are discussed. The electromagnetics of such sensors is briefly explained and some practical modelling techniques are put forward. Excellent agreement with experiment is reported.

Proximity sensor operation method of

Abstract: The proximity sensor cooperates with a trigger (4), an LC resonant circuit (1) and a frequency generator (3). The sensor has an analysis circuit (5) for determining a component, independent of the trigger material, of a complex system parameter dependent on the position and the material of the triggering object (4). The system parameter can be e.g. the impedance of the LC circuit, the amplitude of oscillation or a voltage distribution between the oscillation circuit and a series resistance. An Independent claim is included for a proximity sensor.

Inductive proximity switch with a one-piece housing

Abstract: An inductive proximity switch is provided which comprises a coil, means for supplying the coil with periodic transmitting current pulses, and means for processing signals which correspond to voltages induced in said coil after the end of a transmitting current pulse by the decaying current which previously flows in the detected body due to the voltage induced therein by the transmitting current pulse. In order to improve the robustness of the proximity switch so that it is suitable for durable use in an aggressive environment, the coil, the means for supplying the coil with a periodical transmitting current, and the signal processing means are arranged in a cylindrical housing which is closed on the side of the active surface of the proximity switch and consists of a metal which is not ferromagnetic and whose specific electric resistance is relatively high.