Shadow is a readily used direct measuring system for webs up to 3,5 mm

Shadow works on the principle of laser occlusion over a measuring roller.
It is a direct measuring system, and it is, therefore, independent of the properties of the film.

Shadow is a non–nuclear technology that does not require licensing or protection guards.



Shadow is insensitive to material properties, transparency, colour and opacity. Shadow can measure total thickness of single, multilayer and embossed materials.

Applications Include:
Extruded sheet, Foam, Composites, Multilayer/embossed materials, Calendared sheet, Rubber, Coated Substrates, Non-woven.

← 500 mm - 8 meter →

Shadow are available in widths of 500 mm to 8 meter

≤ 3 μm

Ultra-precise thickness measuring with an accuracy of ≤ 3 µm

≤ 3.5 mm

Shadow is suitable for the material thickness of up to 3.5 mm

Measuring Principle

Laser Shading / Eddy current

The sensor head contains 2 sensors: a laser shading sensor and an eddy current sensor. The shading sensor sends laser beams over the measuring roller and the film to be measured. A receiver (line scan camera) detects the shading by the film and by the roller. The eddy current sensor permanently measures the distance of the sensor head to the measuring roller. The result of both measurements gives directly the thickness of the film.


No calibration is necessary. The measurement is independent of film properties.

Technical Specifications

Technical SpecificationsShadow
Sensor Systemlaser occlusion/eddy current
Max. Thickness3,5 mm
Measured Cleaving5,5 mm
Sensor Diameter30 mm
Measuring Spot Diameter0,5 mm
Sensor Resolution0,5 µm
Repeatability≤ ± 1,5 μm
Measuring Speed10 – 300 mm/s adjustable
Process Speed10 – 500 mm/s adjustable
Calibrationnot mandatory
Diameter of the Reference Roller200 mm

Please download the PDF data sheet for detailed technical specifications! 

Shadow in Action

Contact our Experts

Our experts are always available for your inquiries and technical consultation. Please contact us anytime at our HQ or refer to local SBI Mechatronik  representatives in your country!

Johannes Scherleitner

Sales Director

Johannes will develop a fitting solution for your requirements based on our products and services.

tel. +43 (0) 2952 50701

Roman Geist

Head of Engineering

Roman is your expert for technical questions, application development and custom solutions.

tel. +43 (0) 2952 50701 

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