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What is the measuring principle of capacitive displacement sensor?
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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.
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The use of capacitive sensors
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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.
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Benefits of the measuring principle
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 Wear-free and non-contact measurement
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Distance and thickness measurements on conductive and non-conductive objects
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Unmatched accuracy and stability
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High bandwidth for fast measurements
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Ideal for industrial environments, magnetic fields and vacuum
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Unmatched precision
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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. |
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Modern and user-friendly controller technology
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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.
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Overview
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Active guard ring electrode
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Fast sensor replacement without calibration
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Largest product range worldwide (flat sensors, sensors with integrated cable, sensors with thread…)
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Extremely high stability
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Measuring ranges 0.05 to 10 mm
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Resolution 0.04 nm
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Temperature stability 11 ppm/°C
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Capacitive thread sensors for demanding installation scenarios
capaNCDT sensor
Measuring ranges 0.5 / 1.25 / 2 / 3mm
Socket connection
Mounting via internal thread or screw nut
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Compact & capacitive single-channel system
capaNCDT 6110
Measuring ranges 0.05 -10 mm
Linearity 0.2 %
Resolution 0.01 %
Frequency response up to 20 kHz (-3 dB)
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Modular multi-channel system for highest precision
capaNCDT 6220
Measuring ranges 0.05 -10 mm
Resolution 0.0005 %
Frequency response up to 20 kHz (-3 dB)
Digital data rate 4 x 3.9 kSa/s
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Capacitive multi-channel system for highest resolution
capaNCDT 6500
Measuring ranges 0.05 -10 mm
Linearity 0.05 %
Resolution 0.000075 %
Frequency response 8.5 kHz (-3 dB)
Temp. stab. 9 ppm/°C (controller) |
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Active capacitive measuring system for long signal transmission paths
capaNCDT 61x4
Measuring ranges 2 mm
Linearity max. 2um
Resolution max. 0.3um |
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Capacitive measuring system for industrial applications
capaNCDT 61x0/IP
Measuring ranges 0.5 | 1 | 1.25 | 2 | 3 | 4 | 6
Linearity max. 1 µm
Resolution max. 0.05 µm |
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For precise thickness measurements of plastics
combiSENSOR
One-side thickness measurement of plastic films and coated metals
Target thickness: 40 μm to max. 6 mm
Integrated temperature measurement for output of sensor temperature
Temperature range (sensor) -10 °C … +85 °C
Integrated function to determine the permittivity |
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Measuring the Disc Thickness Variation (DTV)
capaNCDT TDTV
Multi-track thickness measurements
Comprehensive software with real-time evaluation
Dynamic measurements up to 20 kHz
For test benches, road tests and quality assurance
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Robust measuring system for mobile gap measurement
capaNCDT TMD6-22
High accuracy & intuitive operation
Preset measurement modes for immediate operational readiness
Comprehensive sensor portfolio
Ideal for mobile applications in service and maintenance tasks
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