2D Laser Profilometer Proposal

SCRITTO: Giovedì 30 Settembre 2010 15:38 - ULTIMO AGGIORNAMENTO: Venerdì 01 Ottobre 2010 16:34

a. Scope of Supply

Provide a system for 2D profile scanning of AGR tire surface after working process (Standard PC based). Due to requests of 0.1mm accuracy and 500mm max of working range it is necessary to mount the probe head over a fine controlled linear stage (Z Axes) It moves the sensor around the middle of its Working Range while main controlled linear stage (X Axes) moves along scanning area previously set.

b. Probe Selection

For this kind of measures the best solution is an optical probe that ensures reliability (no contact), accuracy and time saving. Selected laser probe has possibility to change Stand Off and Working Range with different optics: this make it the best solution for a lot of measurement devices, and could be used for improved accuracy measurement (see Point 3) The table below shows laser performance (our configuration highlighted):

c. Measuring strategy

Different measuring way may be implemented due to:

-Environment in which the system will work -Scanning time

Operator involvement

-Target Accuracy

These will be an argument under discussion with customer

a. Linear guide From a simple hand drawn idea was designed a simplified Linear Stage drawing in order to achieve a good compromise between a very long measuring stroke and good accuracy. We designed linear stages using high quality standard product to reach these Goals: -Around 35Kg weight for the whole system (see point c.) -All mechanic parts easy to repair and find in the international market. -Compact execution, simple and thought.

A simplified FEA analysis confirms the goodness of the project giving less than 0.01 mm deformation of the cursor applying two opposite forces of 500 N

Related to measuring strategy that will be adopted, a custom electronic board could be necessary to synchronize linear stage encoder position and Laser data.

This device will be equipped with a 32MByte flash memory that permits more than 2 millions measures for one profile scanning.

Device Features will be probably the following:

-2 High Speed Counter (Axis encoders)

-2 trigger Interrupt (laser Latch)

-32MB Flash memory

We have experienced laser probes, linear stages and measuring methods more than five years long. We developed software to directly measures and filter tire profiles and tire surfaces.