Sensors & Transducers


Encoder measures length and velocity without contact

January 2012 Sensors & Transducers

Non-contact sensor for smooth and glossy surfaces.

The German-based Fraba company Intaction has introduced the OptiPactP-L series that extends its range of optical sensors for slip-free, non-contact length and velocity measurement of yard and piece goods. Like all OptiPactP sensors, the OPT-L detects movements in two axes along with surface standstill and direction of movement. Measuring 98 x 42 x 35 mm, the compact sensors need less installation space and can be easily integrated in virtually any application. Equipped with a class 1 laser illumination, the units do not require any additional safety precautions.

The sensors enable users to develop new applications: they are especially suited for smooth and glossy surfaces such as metals, plastics or foils which are problematic for other sensor systems. Fitted with IP65 housings, OptiPact-L sensors are installed at a 30 mm standoff distance from the object being measured and tolerate distance deviations of up to 6 mm. Working distances between 15 and 60 mm are possible on request. The sensor can measure maximum speeds of 4 m/s and the resolution can be freely adjusted in order to meet different application requirements. Measurement uncertainty is lower than 1%.

A graphical user interface enables easy set-up and adaptation to different measuring conditions. Additionally, programmable digital outputs allow users

to precisely control eg, the measurement of piece goods or cutting processes: the outputs can generate a signal when the speed drops below or exceeds a pre-set value, when a direction change occurs or when a selected length is reached. Minimising installation and maintenance costs, the sensors ensure a reliable, efficient quality control which is gentle to the material for smooth and glossy surfaces. With costs per piece comparable to conventional encoder/measuring wheel solutions, the sensors are considerably more cost-efficient when compared to more traditional solutions.



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