Features and benefits
The Velas DL4000-N directly replaces traditional, high-maintenance, problematic contact wheel and rollers type devices, with accurate “state-of-the-art” laser Doppler technology. Extremely easy to install, integrate and use.
Accurate speed and length measurement reduces scrap, increases uptime and improves material yield.
The Velas DL4000-N is an autonomous sensor mounted in cast aluminium housing. A hood for protecting the window glass is fitted with air purging to create an air curtain in front of this glass. The case includes a cooling stainless steel pipe and is fixed to a mounting stand, adjustable with three axes. The electrical connections are made with heavy duty connectors.
The Velas DL4000-N has a range of standoff distances from 600 mm to 2000 mm and is proposed in two models: standard and bi-directional.
The bi-directional velocimeters are used in applications where the target can move in forward and reverse direction, also for low speed application, or if the product can stop, such as position control for cut to length.
The principle is to measure the speed of a moving object using the Doppler effect.
Two laser beams, slightly separated in angle and shifted in frequency, are used to create an interference pattern which will be scattered by the surface of the moving object.
The optical detector (along the optical axis) records a modulated signal including the Doppler frequency. The speed is then calculated analyzing the Doppler shift of the signal.
Finally, the length measurement is computed using a very accurate integration of the speed.
Heat shield kit, to protect from direct radiation
Junction box, including terminal block for connection of power supply and I/Os, and all mandatory laser safety functions for laser class 3B: ON/OFF key switch, emission indicator, remote interlock connector.
Configuration port RS485 (a USB to RS485 adapter is provided).