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High-precision eddy-current sensors from Micro-Epsilon are being used to measure the displacement of soil samples on a complex hollow cylindrical torsional apparatus (HCTA) in Bristol University’s department of civil engineering.

The HCTA test rig is equipped with a complex strain measurement system that incorporates six Micro-Epsilon EddyNCDT 3010 non-contact displacement sensors.

The compact, single-channel sensors have a measuring range of 2mm and are mounted in three pairs to measure the axial, circumferential and radial displacement of the soil samples. Sensor resolution is 0.1µm and linearity is ±0.25 per cent FSO.

The test-rig experiments are designed to enable the study of pre-failure deformation characteristics and strain behaviour via continuous tests on a single soil sample (drained or undrained). This allows soil stiffness to be analysed under different strain and stress conditions.

Key benefits of product application

  • According to Dr Erdin Ibraim, reader in geomechanics at the university, the EddyNCDT 3010 sensors — which are being used to test granular soils in multi-axial loading conditions — were chosen for their excellent technical qualities, including high resolution, high linearity and long-term stability.
  • Micro-Epsilon’s electronic (active) compensation method minimises temperature-dependent measuring errors, ensuring thermal stability of less than 150ppm/ºF.
  • The sensors are maintenance and wear free and offer flexible field calibration for different target materials.
  • Ibraim has been so impressed with the eddy-current sensors that he recently purchased a further 12 of the devices from Micro-Epsilon for smaller test-rig applications.


With over 45 years experience and more than 15,000 customers worldwide, Micro-Epsilon understands the need for accurate, robust, intelligent sensors and measurement systems.

With over 45 years experience and more than 15,000 customers worldwide, Micro-Epsilon understands the need for accurate, robust, intelligent sensors and measurement systems.

If you are measuring any type of displacement / position, temperature, speed or colour parameters, Micro-Epsilon sensors and systems provide market-leading performance, together with the fastest measuring rates, highest operating temperature ranges and smart interface capabilities. From simple, low cost sensors to high volume, customer-specific OEM solutions, Micro-Epsilon will have athe correct measurement solution for your application.

Using both contact and non-contact measurement techniques, Micro-Epsilon boasts one of the largest ranges of displacement sensors including 1D, 2D & 3D laser optical, confocal chromatic, eddy current, capacitive, inductive, draw-wire and time-of-flight technologies. Measuring ranges are from nanometers to kilometers!

For temperature measurement, there is a comprehensive range of non-contact infrared temperature sensors and thermal imaging cameras capable of measuring up to that include intelligent software packages to support configuration, analysis and management during the application. LED analysers, fibre optic sensors and Colour recognition sensors measure true colour using L*A*B and CIE.

Micro-Epsilon sensors are used throughout almost all industries: from automotive to aerospace, motorsport to metal production, semiconductor to subsea. Whether it’s an R&D, test, inspection, OEM or a process control application, Micro Epsilon measurement engineers can provide the right measurement solution.

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