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Interferometric Displacement Measurement

  • quDIS Interferometric Distance Measurement - three channels in the 19" rack.
  • Overview
  • Sensor Heads
  • Accessoires
  • Downloads
The quDIS is a confocal displacement sensor, by default based on a Fabry-Pérot interferometer, with highest signal stability of < 0,05 nm and a contrast independent measuring algorithm.

Next to displacement and distance measurement, vibration analysis is possible with a 25 kHz bandwidth in free space or glass rods & fibers as cavities.

Key Features

Confocal displacement sensor
Fiber interferometer
< 0.05 nm signal stability, no periodical artifacts
20 … 1400 mm working distance
25 kHz bandwidth
Contrast independent
3 sensor axes, multiple devices
Flexible fiber-based sensor heads


Slow drifts
Vibration analysis
Position and angles
Velocity and acceleration
Quality control
Fail-safe procedures
Beam interrupt compensation
Quality control

Sensor Heads

All applications require different constrains for collimation, focusing and the beam profile, depending on their reflecting targets. The shaping of the laser beam is achieved by different sensor heads. All these sensor heads for quDIS are based on optical fibers, well-established in the telecommunication market.

Next to standard collimators and established focusing heads, qutools designs special heads for applications in harsh environments.

The design of a sensor head for measuring objects at high temperature drifts.

This collimator is manufactured of a nickel–iron alloy with low coefficient of thermal expansion.

Accessoires and Upgrades

Distance Measurement

Determination of absolute distances within the wavelength range.
Compensation of huge height differences or beam interruptions.

Ambient Measurement Unit (AMU)

Analysis of environmental parameters like temperature, pressure and relative humidity.
Failure correction, Measurement of refractive index.


Fibre coupling unit for fast and automatic laser coupling.
Quick calibration measurement even at separated locations.


Different reflector solutions: Retroreflectors, plane or parabolic mirrors.
Temperature caused deformation and signal stabilisation.


quDIS brochure 11/2021 2.5 MB pdf
quDIS whitepaper 06/2020 0.9 MB pdf
quDIS manual 09/2021 1.4 MB pdf
quDIS datasheet 11/2021 0.1 MB pdf
quDIS AMU datasheet 09/2021 0.1 MB pdf