What is the measuring principle of eddy current sensor?
Among inductive displacement sensors, the eddy current principle occupies a unique position. Measuring via eddy current is based on the extraction of energy from an oscillating circuit. This energy is needed for the induction of eddy currents in electrically-conductive materials. Here, a coil is supplied with an alternating current, causing a magnetic field to form around the coil. If an electrically conducting object is placed in this magnetic field, eddy currents are induced which form a field according to Faraday’s induction law. This field acts against the field of the coil, which also causes a change in the impedance of the coil. The impedance can be calculated by the controller by looking at the change in the amplitude and phase position of the sensor coil.
High precision
For many years, Micro-Epsilon has been a pioneer in displacement measurement using high precision eddy current technology. The eddyNCDT displacement sensors are designed for non-contact measurement of displacement, distance, position, oscillation and vibrations. Considered as extremely precise and robust, they are preferably used in industrial environments.
Advantages
Wear-free and non-contact measurement
Highest precision and resolution
High temperature stability
Ferromagnetic and non-ferromagnetic materials
For demanding, industrial environments: dirt, pressure, temperature
Fast measurements up to 100 kHz
Eddy current sensor with integrated controller pages
What is the measuring principle of capacitive displacement sensor?
A capacitive displacement sensor is a non-contact sensor used to measure the change in displacement, position and thickness measurement of an object by detecting variations in capacitance.
The principle of capacitive displacement sensor is based on the formation of an electric field between two electric plates, with a dielectric material between them. If a constant alternating current flows through the sensor capacitor, the amplitude of the alternating voltage on the sensor is proportional to the distance between the capacitor electrodes. The alternating current is demodulated and output as an analog signal.
The use of capacitive sensors
These sensors are widely utilized in various industries, such as automotive, aerospace, manufacturing and research, due to their high precision, sensitivity and reliability.
The sensors measure against all electrically conductive materials and with appropriate electronic circuitry even against insulators.
Capacitive sensors work in clean environments.
Benefits of the measuring principle
Wear-free and non-contact measurement
Distance and thickness measurements on conductive and non-conductive objects
Unmatched accuracy and stability
High bandwidth for fast measurements
Ideal for industrial environments, magnetic fields and vacuum
Unmatched precision
Practice shows that capaNCDT measuring systems achieve excellent results in terms of linearity, repeatability and resolution. While sub-micrometer precision is reached in industrial environments, high-precision sub-nanometer measurements are carried out in clean environments.
Modern and user-friendly controller technology
Modern capaNCDT controllers are the ideal basis for different fields of applications. Various interfaces and ease of use via web interface allow for a fast integration into the respective application environment.
Overview
Active guard ring electrode
Fast sensor replacement without calibration
Largest product range worldwide (flat sensors, sensors with integrated cable, sensors with thread…)
Extremely high stability
Measuring ranges 0.05 to 10 mm
Resolution 0.04 nm
Temperature stability 11 ppm/°C
Capacitive thread sensors for demanding installation scenarios
Wear-free and non-contact measurement
