Non-contact measurement of speed and length
Why non-contact measuring?



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The optical measuring device VLM500 opens completely new perspectives for quality assurance and automation processes in industry. Lengths and velocity can be measured extremely precisely and free from wear, where traditional, wheel solutions, are either not suited to the process or are not sufficiently precise. With the VLM500 ASTECH offers a measuring device which is mostly compatible with the well-established VLM320 and which has been customized to the requirements of industrial applications.
Independent from the material the VLM500 measures lengths and velocities without contact and due to its comprehensive interfaces it can optimally be integrated into automation and quality assurance processes in different industrial sectors.The VLM500 works optically and contact-free. Based on a CCD sensor it implements the spatial filter principle. Spatial filter is the generic term for a measuring principle for the optical determination of velocity and length of moving objects.

The spatial filter is based on the filtering effect of lattice-like structures (grid modulation). Basically, the functional principle of the VLM500 can be described as follows: The measuring object is projected on the CCD sensor which functions as an optical grid (no image taking). The VLM500 is equipped with an LED light source for the illumination of the measuring object. Due to the grid modulation a signal frequency, which is proportional to the speed, occurs upon movement of the object. The device calculates the velocity from the measured signal frequency. Several control circuits allow for automatic adjustment to most diverse materials.

The VLM500 does not put high requirements on the surface character of the measuring object: Precise measurement is facilitated on periodic structures as well as on stochastic surfaces of metals, wood, rubber or paper.


  • Contactless
  • Measuring range up to 50 m/s
  • Measuring uncertainty ±0.025 %
  • Working distances: 185 mm, 240 mm or 330 mm (and customized)
  • Slip-free
  • Wear-free
  • Material independent
  • High power illumination LED
  • No dangerous laser radiation
  • Robust and precise
  • Insensitive to contamination
  • Economical
  • Various interfaces
  • Easy installation
  • Easy maintenance
  • PC software for parameterization
  • 60-months warranty
  • Quality product made in Germany