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Principle of operation - Correlation between current and previous digital images of the surface moving object.
Image correlation features:
Non-contact measurement of slab velocity
In comparison to encoder, ICV measure the slab velocity immediately.
Image correlation velocimeter vs. encoder
Independence to shape of slab
There is no any dependence for ICV on shape of slab. For example, for LDV, the surface must be perpendicular to the laser beam.
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Shape of slab: ICV vs. LDV
Large stand-off distance: from 1600 to 4000 mm
It is important for several slab CCM. For CCM it is possible to place ICV on one side apart from strands.
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Large depth of field (stand-off distance)
Image Correlation Velocimeter is able to control the slab velocity, when distance to slab is changing very large.
- Depth of field (stand-off distance): ICV vs. LDV - var.1
- Depth of field (stand-off distance): ICV vs. LDV - var.2
It is easy possible to connect ICV interface to CCM control system
Low cost converter is able to convert RS485 interface pulses similar encoder.
It is possible to detect velocity vibration due to CCM crystallization
This diagram shows velocity vibration, detected by ICV on continuous casting machine:
- Velocity vibration shown in detail:
Velocity vibration spectrum:
