Menu Home


Interferometric Distance Measurement

  • quDIS Interferometric Distance Measurement - three channels in the 19" rack.
  • Overview
  • Sensor Heads
  • Accessoires
  • Specifications
  • 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 relative and absolute 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
Absolute distance measurement
0.03 … 20 m 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
Gap and edge measurement in layered structures

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

Absolute 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.


Signal stability, relative distance *1< 0.05nm
Accuracy relative measurement200nm/m
Signal stability, absolute distance *2< 200nm
Accuracy absolute measurement2000nm/m
Bandwidth relative / absolute25kHz
Working distance *30.03 ... 20m
Target speed1m/s
Laser power (class 1)< 400µW
Wavelength1 535nm
Fiber input connectorsFC Narrow-Key-Slot Mating Sleeves
UpgradeableAbsolute distance measurement
InterfaceUSB 3.0, Ethernet
SoftwareGUI, DLL, LabView, Python, Command line
Dimensions440 x 300 x 50mm x mm x mm
Power consumption< 50
at 100 to 230 VAC

*1: relative distance RMS@ 100Hz, 2s, 130mm
*2: absolute distance RMS@ 100 Hz 130 mm
*3: sensor head dependent


quDIS brochure 06/2020 3.5 MB pdf
quDIS whitepaper 06/2020 0.9 MB pdf
quDIS manual 09/2021 1.4 MB pdf
quDIS datasheet 09/2021 0.1 MB pdf
quDIS AMU datasheet 09/2021 0.1 MB pdf


Please contact qutools before installing any new software, as we cannot guarantee compatibility with all delivered quDIS devices and their features.

quDIS software V1.1.3 03/2020 13.2 MB zip
quDIS 64bit library win V1.1.3 03/2020 0.2 MB zip
quDIS 64bit Linux V1.1.3 03/2020 2.0 MB tgz
quDIS software V2.0.3 06/2021 14.9 MB zip
quDIS 64bit library win V2.0.3 06/2021 0.3 MB zip
quDIS 64bit Linux V2.0.3 06/2021 5.6 MB tgz