Thickness measurement for up to 2 m wide strips

alpha.ti 5.0 / Laser measurement system

Laser based measurement of strips

For use in process and finishing lines

easuring method suitable for thicknesses of any size independent of material composition
Small measuring spot, high detail resolution
Precise position information along and transverse strip direction
High measuring frequency for speeds up to 2000 m/min with a measurement accuracy starting from ± 1.5 μm
Fast and automatic adjustment of sensor sensitivity to any surface
Patented drift compensation for the entire system
Traceability due to automatic referencing on gauge blocks
Automatic measuring equipment monitoring according to MSA method 1
Laser class 2, no special safety precautions necessary

C-frame for cross profile measurement up to 2100 mm

C-frame versions, measuring depths: 500 / 1000 / 1500 / 2100 mm

Patented drift compansation

The deformation sensor continuously records the distance between the two C-bars at the scanning frequency of the triangulation sensors with a precision of 0.5 µm. Any change is immediately compensated automatically. This allows C-frame designs with a measuring depth of more than 2 meters with constant measuring accuracy.

Continuous measurement data acquisition - high sampling rate and resolution

Accuracy of measurement data

Measuring accuracy is 0.01 % of the measuring range
Repeatability is about a factor of 10 better than the measuring accuracy
Three measuring ranges are available:
- 15 mm → Accuracy ± 1.5 μm → Repeatability ± 0.2 μm
- 25 mm → Accuracy ± 2.5 μm → Repeatability ± 0.4 μm
- 40 mm → Accuracy ± 4.0 μm → Repeatability ± 0.6 μm

Video: Principle of thickness and cross profile measurement

With a measuring frequency of up to 67 kHz, strips over two meters wide can be measured along the strip direction, and in addition, in transverse strip direction for cross profile measurement.

Standard configuration- laser measurement system

automatic drift compensation through real-time deformation sensor
temperature independent sensor linearity
automatic exposure time and laser power control
sample measurement mode
automatic thickness reference unit using standard gauge blocks
sensor windows prepared for compressed air blow-off
measuring device capable, automatic monitoring according to MSA method 1
standard interfaces Profinet, TCP/IP (optional: Profibus, UDP)
prepared for analogue signal interface
user interface in German or English (optional: national language)
remote maintenance access via Ethernet
E-cabinet 1000 x 600 x 400 (h x w x d in mm)
15 m cable set (max. 80 m)
signal inputs for safety-door and E-stop

Technical data - alpha.ti 5.0

C-frame	C-15	C-25	C-40
Measurement principle	laser triangulation	laser triangulation	laser triangulation
Measurement window	15 mm	25 mm	40 mm
Linearity	± 1.5 μm	± 2.5 μm	± 4 μm
Repeatability	± 0.2 μm	± 0.4 μm	± 0.6 μm
Measurement frequency	max. 67 kHz	max. 67 kHz	max. 67 kHz
Integration time	0.5 μs - 1000 ms	0.5 μs - 1000 ms	0.5 μs - 1000 ms
Laser class	2 (no laser safety officer)	2 (no laser safety officer)	2 (no laser safety officer)
Laser wave length	660 nm (red)	660 nm (red)	660 nm (red)
Measurement spot	50 μm	50 μm	50 μm
Laser life time (MTBF)	80000 h @ 20 °C	80000 h @ 20 °C	80000 h @ 20 °C
Measurement depth from strip edge	500 / 1000 / 1500 / 2100 mm	500 / 1000 / 1500 / 2100 mm	500 / 1000 / 1500 / 2100 mm
C-frame width	144 mm	144 mm	144 mm
Traversing speed	0.25 m/s	0.25 m/s	0.25 m/s
Material type	all non-transparent materials, surface and alloy independent	all non-transparent materials, surface and alloy independent	all non-transparent materials, surface and alloy independent
Material speed	> 0 m/min; ≤ 2000 m/min	> 0 m/min; ≤ 2000 m/min	> 0 m/min; ≤ 2000 m/min
Material temperature	≤ 100 °C, others with active tempering	≤ 100 °C, others with active tempering	≤ 100 °C, others with active tempering